Section 4
4.1Temperature Control Microprocessor System
The temperature control Micro-Link 3 microprocessor system consists of a control module (controller), keypad, display module and interconnected wiring.
The controller (see Figure 4.1) is fitted with test points, harness connectors and a software card programming port. The controller contains temperature control software and DataCORDER software. The temperature control software (see Section 4.2) functions to operate the unit components as required to provide the desired cargo temperature and humidity. The DataCORDER software (see Section 4.6) functions to record unit operating parameters and cargo temperature parameters for future retrieval.
Read the Controller Service section (see Section 7.27), including all caution statements, before performing any service on the controller.
1)Micro-Link 3 Controller / DataCORDER Module
2)Mounting Screw
3)Connectors
4)Test Points
5)Fuses
6)Control Circuit Power Connection
7)Software Programming Port
8)Battery Pack (Standard Location)
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4.1.2Display Module and Keypad
The display module and keypad (see Figure 4.2) are mounted on the control box door and serve to provide user access and readouts for both of the controller functions, temperature control and DataCORDER. The functions are accessed by keypad selections and viewed on the display module.
Figure 4.2 Display Module and Keypad
The display module consists of two 5-digit displays and seven indicator lights. The indicator lights are described in Table 4–1. The keypad consists of eleven push button switches that act as the user’s interface with the controller. The switch functions are described in Table 4–2.
The controller software is a custom designed program that is subdivided into configuration software and operational software. The controller software performs the following functions:
•Control supply or return air temperature to required limits, provide modulated refrigeration operation, economized operation, unloaded operation, electric heat control, and defrost. Defrost is performed to clear buildup of frost and ice to ensure proper air flow across the evaporator coil.
•Provide default independent readouts of setpoint and supply or return air temperatures.
•Provide ability to read and (if applicable) modify the configuration software variables, operating software function codes and alarm code indications.
•Provide a pre-trip step-by-step checkout of refrigeration unit performance including: proper component operation, electronic and refrigeration control operation, heater operation, probe calibration, pressure limiting and current limiting settings.
•Provide battery-powered ability to access or change selected codes and setpoint without AC power connected.
•Provide the ability to reprogram the software through the use of a memory card.
4.2.1Configuration Software (CnF Variables)
Configuration software is a variable listing of the components available for use by the operational software. This software is factory installed in accordance with the equipment fitted and options listed on the original purchase order. Changes to the configuration software are required only when a new controller has been installed or a physical change has been made to the unit such as the addition or removal of an option. A configuration variable list is described in Table 4–3. Change to the factory-installed configuration software is achieved via a configuration card or by communications.
Note: Configuration numbers not listed are not used in this application. These items may appear when loading configuration software to the controller but changes will not be recognized by the controller programming.
4.2.2Operational Software (Cd Function Codes)
The operational software is the actual operation programming of the controller which activates or deactivates components in accordance with current unit operating conditions and selected modes of operation.
The programming is divided into function codes. Some of the codes are read only, while the remaining codes may be user configured. The value of the user configurable codes can be assigned in accordance with user desired mode of operation. A list of the function codes is described in Table 4–4.
General Notes on Function Code Navigation
1.Press the CODE SELECT key on the keypad. Then, use the Arrow keys to navigate through the function codes (Cd) in the left display. The right display will show the respective data. If the right display shows dashes “-----”, then this is an optional code not available to the system.
2.Press the ENTER key to navigate into the menu of the selected Cd code. Pressing the ENTER key will cause the present selected value to be displayed for 5 seconds, or until the user selects a different value. If additional time is required, pressing the ENTER key will extend the display time to 30 seconds.
3.Pressing CODE SELECT key in a selection menu cancels the current selection activity and ascends back up to the next higher selection menu.
4.If the operator does not press any key for five seconds the interface reverts to normal system display and the current selection menu is cancelled, but any previously committed changes are retained.
Code |
Description |
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If a function is not applicable or the related option not purchased for the unit, the display will read “-----” |
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Display Only Functions - Cd01 through Cd26 are display only functions. |
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Capacity Modulation (%) |
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Cd01 displays the DUV percent closed. The right display reads 100% when the valve is fully closed. The valve will usually be at 10% on start up of the unit except in very high ambient temperatures. |
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Compressor Motor Current |
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Cd03 displays the current value passing through the compressor motor leg T3. The current sensor measures current draw in lines L1 & L2 by all of the high voltage components. It also measures current draw in compressor motor leg T3. |
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Line Current, Phase A Line Current, Phase B Line Current, Phase C |
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Cd04, Cd05, Cd06 display the measured of Phase A, B and C in amperes. The current sensor measures current on two legs. The third unmeasured leg is calculated based on a current algorithm. The current measured is used for control and diagnostic purposes. For control processing, the highest of the Phase A and B current values is used for current limiting purposes. For diagnostic processing, the current draws are used to monitor component energization. Whenever a heater or a motor is turned ON or OFF, the current draw increase/reduction for that activity is measured. The current draw is then tested to determine if it falls within the expected range of values for the component. Failure of this test will result in a pre-trip failure or a control alarm indication. |
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Main Power Voltage |
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Cd07 displays the main supply voltage. |
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Main Power Frequency |
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Cd08 displays the value of the main power frequency in Hertz. The frequency displayed will be halved if either fuse F1 or F2 is bad (alarm code AL21). |
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Ambient Temperature |
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Cd09 displays the ambient sensor reading. |
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Compressor Suction Temperature / Evaporator Temperature |
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Cd10 displays the Evaporator Temperature Sensor (ETS) reading. |
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Compressor Dome Temperature / Discharge Temperature |
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Cd11 displays the Compressor Discharge Temperature Sensor (CPDS) reading, using compressor dome temperature, is displayed. |
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Compressor Suction Port Pressure / Evaporator Pressure |
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Cd12 displays the Evaporator Pressure Transducer (EPT) reading in the left display; Press ENTER at Cd12 to show reading for compressor suction port pressure in the right display. |
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Compressor Discharge Pressure |
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Cd14 displays the Compressor Discharges Pressure Transducer (DPT) reading. |
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Digital Unloader Valve |
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Cd15 displays the status of the Digital Unloader Valve (DUV) as Open or Closed. |
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Compressor Motor Hour Meter / Unit Run Time Hour Meter |
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Cd16 displays the compressor motor hours. The user can view unit run time by pressing the ENTER key while in Cd16. Total hours are recorded in increments of 10 hours (i.e., 3000 hours is displayed as 300). The Compressor Motor Hour Meter display can be reset to 0 by pressing and holding the ENTER key for 5 seconds. The Unit Run Time Hour Meter cannot be reset. |
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Relative Humidity (%) |
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Cd17 displays the Humidity Sensor (HS) relative humidity reading, as a percent value. |
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Software Revision Number |
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Cd18 displays the software revision number. |
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Battery Check |
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Cd19 checks the Controller / DataCORDER battery pack. While the test is running, “btest” will flash on the right display, followed by the result. “PASS” will be displayed for battery voltages greater than 7.0 volts. “FAIL” will be displayed for battery voltages between 4.5 and 7.0 volts, and “-----” will be displayed for battery voltages less than 4.5 volts. After the result is displayed for four seconds, “btest” will again be displayed, and the user may continue to scroll through the various codes. |
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Config / Model Number |
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Cd20 indicates the dash number of the model for which the Controller is configured (i.e., if the unit is a 69NT40-561-253, the display will show “61253”). To display controller configuration database information, press ENTER. Values in “CFYYMMDD” format are displayed if the controller was configured with a configuration card or with a valid OEM serial port configuration update; YYMMDD represents the publication date of the model configuration database. |
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Capacity Mode |
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Cd21 displays the mode of operation as Unloaded, Standard, or Economized. |
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Compressor State |
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Cd22 displays the status of the compressor as OFF or On. |
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Evaporator Fan State |
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Cd23 displays the current state of the evaporator fan as OFF, LOW or HIGH. |
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Compressor Run Time Remaining Until Defrost |
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Cd25 displays the time remaining until the unit goes into defrost (in tenths of an hour). This value is based on the actual accumulated compressor running time. |
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Defrost Temperature Sensor Reading |
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Cd26 displays the Defrost Temperature Sensor (DTS) reading. |
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Configurable Functions - Cd27 through Cd37 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container. |
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Defrost Interval (Hours or Automatic) |
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Cd27 controls the Defrost Timer Interval, which is the desired period of time between defrost cycles. The user-selected intervals are 3, 6, 9, 12, 24 Hours, Off, AUTO, PuLS, AUTO2, or AUTO3. Factory default is “AUTO”. See the Defrost Operation (Section 4.3.21) for information on Defrost Timer Interval. After a new Defrost Interval is selected, the previously selected Interval is used until the next defrost termination, the next time the DTT contacts are OPEN, or the next time power to the control is interrupted. If the previous value or the new value is “OFF”, the newly selected value will be used immediately. If any Auto Pre-trip sequence is initiated, Cd27 will be set to ‘AUTO’ unless CnF49 (OEM Reset) is set to “Custom” AND CnF64 (Evaporator Fan Pulsing Logic) configuration variable is set to IN, in which case Cd27 will be set to “PuLS”. CnF11 determines whether the operator will be allowed to chose “OFF” as a defrost interval option. CnF64 determines whether the operator will be allowed to choose “PuLS” as a defrost interval option. For units operating with “PuLS” selected, defrost interval is determined by the unit temperature setpoint and the Evaporator Fan Pulsing Temperature Setting (Cd60). When the unit temperature setpoint is equal to or less than the Evaporator Fan Pulsing Temperature Setting, the defrost interval is set to 6 hours. Otherwise, the defrost interval is determined using the Automatic Defrost Interval Determination logic. In either case, “PuLS” remains displayed in this function select code. |
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Temperature Units (Degrees C or Degrees F) |
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Cd28 controls the temperature units (C or F) that will be shown on all temperature values. The user selects C or F by selecting function code Cd28 and pushing the ENTER key. The factory default value is Celsius units. This function code will display “-----” if CnF34 is set to F. |
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Failure Action (Mode) |
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Cd29 controls the shutdown action to take if all of the control sensors are out of range (alarm code AL26) or there is a probe circuit calibration failure (alarm code AL27). Cd29 has one of four possible actions to select as described below: •A - Full Cooling (Compressor is on, economized operation.) •b - Partial Cooling (Compressor is on, standard operation.) •C - Evaporator Fan Only (Evaporator fans on high speed, not applicable with frozen setpoints.) •d - Full System Shutdown - Factory Default (Shut down every component in the unit.) |
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In-Range Tolerance |
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Cd30 controls the in-range tolerance, which determines the temperature band around the setpoint which will be designated as in-range. If the control temperature is in-range, the green IN-RANGE light will be illuminated. For normal temperature control, control temperature is considered in range if it is within setpoint in-range Tolerance. There are four possible values: •1 = +/- 0.5°C (+/-0.9°F) •2 = +/- 1.0°C (+/-1.8°F) •3 = +/- 1.5°C (+/-2.7°F) •4 = +/- 2.0°C (+/-3.6°F) - Factory Default In-range tolerance shall be set to +/- 2.0°C upon activation of Dehumidification or Bulb Mode (Cd33, Cd35, Cd48). When QUEST is actively controlling, in-range tolerance is not considered. “-----” will be displayed whenever Dehumidification or Bulb Mode is enabled or when CCPC with six hour re-activation is actively controlling. “-----” will be displayed whenever Frozen Economy Mode is operating. |
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Cd31 |
Stagger Start Offset Time (Seconds) |
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Cd31 displays the stagger start offset time, which is the amount of time that the unit will delay at start-up. This allows multiple units to stagger their control initiation when all units are powered up together. The eight possible offset values are: 0 (Factory Default), 3, 6, 9, 12, 15, 18 or 21 seconds. |
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Cd32 |
System Current Limit (Amperes) |
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Cd32 displays the current limit, which is the maximum current draw allowed on any phase at any time. Limiting the unit’s current reduces the load on the main power supply. When desirable, the limit can be lowered. Note, however, that capacity is also reduced. The five values for 460 VAC operation are: 15, 17, 19, 21, or 23 amperes. The factory default setting is 21 amperes. |
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Cd33 |
Humidity Setpoint |
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Cd33 controls dehumidification along with setting the relative humidity value in percent that will trigger dehumidification. Relative humidity is detected with a humidity sensor and this sensor reading can be viewed at Cd17. There are configuration variables that determine whether dehumidification capabilities are installed. Note: Humidification was once available but no longer supported. Cd33 has the following values / settings: •“XX” - lower humidity setpoint •“dISbL” - This disables dehumidification entirely; the humidity sensor is removed from the logic. Humidity sensor variable CnF04 is set to OFF. This is available with software revision 5374 and higher. Refer to Disabling the Humidity Sensor procedure in Section 7.20.1 for detail. •“tESt” - Dehumidification test can be run. Setpoint will be temporarily set to 1%, during the test. After 5 minutes, the normal setpoint is restored. •“OFF” - Turns off dehumidification. •“XX” - upper humidity setpoint If Pre-Trip Inspection is initiated, Cd33 will be set to “OFF” automatically. If CnF50 Enhanced Bulb Mode Interface is active, then Cd33 will show instead Cd48 Dehumidification / Bulb Cargo Mode Parameter Selection. |
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Economy Mode (On-Off) |
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Cd34 displays the current state of the Economy Mode option, “-----”, On, or OFF. CnF22 determines whether Economy Mode offered. Economy Mode is a user selectable mode of operation provided for power saving purposes. |
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Bulb Mode |
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Cd35 displays the current state of the Bulb Mode option, “-----”, nOr, or bULb. Bulb Mode is an extension of dehumidification control (Cd33). If dehumidification (CnF04) is set to “Off,” Cd35 will display “Nor” and the user will be unable to change it. CnF28 determines whether the Bulb Mode selection is offered. After a dehumidification setpoint has been selected and entered for code Cd33, the user may then change Cd35 to “bulb.” After Bulb Mode has been selected and entered, the user may then utilize function codes Cd36 and Cd37 to make the desired changes. If CnF50, Enhanced Bulb Mode, is active then Cd35 will instead show settings for Cd48. |
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Evaporator Fan Speed |
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Cd36 is for setting the desired evaporator fan speed for use during the Dehumidification Bulb Mode option. This code is enabled only if Dehumidification Mode (Cd33) is On and Bulb Mode (Cd35) has been set to “bulb.” If these conditions are not met, “alt” will be displayed (indicating that the evaporator fans will alternate their speed) and the display cannot be changed. If a dehumidification setpoint has been selected along with Bulb Mode then “alt” may be selected for alternating speed, “Lo” for low speed evaporator fan only, or “Hi” for high speed evaporator fan only. If a setting other than “alt” has been selected and Bulb Mode is deactivated in any manner, then selection reverts back to “alt.” If CnF50, Enhanced Bulb Mode, is active then Cd36 will instead show settings for Cd48. |
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Variable DTT Setting (Bulb Mode) |
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Cd37 displays the variable Defrost Termination Thermostat (DTT) setting to be used with the optional Bulb Mode functionality. This item is only displayed if the Bulb Mode option is configured on. If CnF50, Enhanced Bulb Mode, is active then Cd37 will instead show settings for Cd48. |
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Display Only Functions - Cd38 through Cd40 are display only functions. |
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Secondary Supply Temperature Sensor |
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Cd38 displays the current Supply Recorder Sensor (SRS) reading only if the unit is configured for four probes and the DataCORDER is configured OFF. Otherwise, Cd38 will display dashes “-----.” If the DataCORDER suffers a failure (alarm AL55), Cd38 will display the SRS reading. |
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Secondary Return Temperature Sensor |
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Cd39 displays the current Return Recorder Sensor (RRS) reading only if the unit is configured for four probes and the DataCORDER is configured OFF. Otherwise, Cd39 will display dashes “-----.” If the DataCORDER suffers a failure (alarm AL55), Cd39 will display the RRS reading. |
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Container Identification Number |
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Cd40 displays the Container ID number. If a valid container id exists, the default display for Cd40 will be “XXXXX” where “XXXXX” is the 5th character through the 9th character of the container id. Pressing the ENTER key on Cd40 will display | “id Y” | “YYYYYY” | where “YYYYYYY” is the 5th character to the 11th character of the container id. If no valid container id exists or the container id is blank, the right display will alternate between “_nEEd” and “___id”. Pressing the ENTER key while on Cd40 in the state will prompt the Set Id Interface. On start up, if the container id is not valid, Cd40 will be brought up on the display for the first minute of power up. This can be left by either entering a container id or leaving the code select normally. Cd40 is configured at commissioning to read a valid container identification number. The reading will not display alpha characters; only the numeric portion of the number will display. |
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Valve Override |
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Cd41 is a SERVICE FUNCTION. This code is for troubleshooting and allows manual positioning of the Economizer Solenoid Valve (ESV), Electronic Expansion Valve (EEV), and Digital Unloader Valve (DUV). Provides readings such as: Percent Capacity, EEV, Capacity Mode, LIV and DUV. See Section 7.25 for operating instructions. |
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Configurable Functions - Cd43 is a user-selectable function. The operator can change the value of this function to meet the operational needs of the container. |
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XtendFRESH Mode |
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Cd43 controls the XtendFRESH controlled atmosphere option. If a unit does not have the XtendFRESH option, dashes “-----” will be displayed. Cd43 contains four selectable modes of operation: •FrESh - All XtendFRESH operations are enabled and setpoints for CO2 and O2 can be edited. •OFF - All XtendFRESH operations are disabled. •tESt - Allows the user to test mechanical components, test and calibrate the CO2 sensor and verify the validity of the O2 sensor. •PUrgE - Allows the user to suspend XtendFRESH operations while pre-charging gas levels in the container. All XtendFRESH control actions and alarms 29 and 96 are suspended. Turn On XtendFRESH (Fresh Mode): 1.Use the Arrow keys to bring up “FrESh” and press ENTER. 2.The display will show | “CO2SP” | “#” |, where # is the CO2 setpoint value. Use the Arrow keys to select a CO2 setpoint and press ENTER to confirm. Or, just press ENTER to keep the originally displayed value. The CO2 setpoint is the maximum level of CO2 allowed for the cargo. The range is 0% to 19% in 1% increments, with a default setting of 5%. 3.The display will show | “O2 SP” | “#” |, where # is the O2 setpoint value. Use the Arrow keys to select an O2 setpoint and press ENTER to confirm. Or, just press ENTER to keep the originally displayed value. The O2 setpoint is the minimum level of oxygen allowed for the cargo. The range is 3% to 21% in 1% increments, with a default setting of 10%. Turn Off XtendFRESH: 1.To manually turn XtendFRESH Mode Off from the Cd43 menu, use the Arrow keys to bring up “OFF” and press ENTER. For detailed procedures and technical information related to the XtendFRESH controlled atmosphere, refer to the T-366 XtendFRESH Manual. |
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Display Only Function - Cd44 is a display only function. |
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XtendFRESH Values |
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Cd44 displays the following XtendFRESH values: •CO2 setpoint •CO2 percentage •O2 setpoint •O2 percentage •O2 voltage For the CO2 setpoint, the range is from 0 to 19% in 1% increments with a default setting of 5%. For the O2 setpoint, the range is from 3% to 21% in 1% increments with a default setting of 10%. For detailed procedures and technical information related to the XtendFRESH controlled atmosphere, refer to the T-366 XtendFRESH Manual. |
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Configurable Functions - Cd45 through Cd48 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container. |
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Vent Position Sensor (VPS) Position |
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Cd45 displays positional values for the Vent Position Sensor (VPS). Values are to 240 for UPPER, 0 to 225 for LOWER. If a unit does not configured for a VPS, dashes will be displayed “-----”. When configured for VPS, Cd45 displays the current VPS position in units of 5 CMH (displayed as “CM”) or CFM (displayed as “CF”) depending on the selection of Cd46 (Airflow display units), Cd28 (Metric/Imperial) or the pressing of the deg C/F key. Cd45 will display whenever the control detects movement via the VPS unless AL50 is active. Cd45 will display for 30 seconds, then time out and return to the normal display mode. |
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Airflow Display Units |
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Cd46 selects the airflow units to be displayed by Cd45 if configured for Vent Position Sensor (VPS) or displayed by “USER/FLO” under Cd43 if configured for Autoslide. •CF = Cubic Feet per Minute •CM = Cubic Meters per Hour •bOth = Displays CF or CM depending on the setting of Cd28 (Metric/Imperial) or the pressing of the degree C/F key. |
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Variable Economy Temperature Setting |
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Cd47 controls the Variable Economy Temperature setting. This is applicable when Economy Mode (CnF22) is set to 3-cust. Cd47 will show dashes “----” if the unit is not configured for Economy Mode. When the unit has a perishable setpoint and Economy Mode is active, at the start of each cooling or heating cycle, high speed evaporator fans will run for three minutes. After three minutes, the evaporator fans will be switched to low speed any time that the supply temperature is within +/- 0.25°C of the setpoint and the return temperature is less than or equal to the supply temperature + the user selected Cd47 (values are 0.5°C - 4.0°C, default is 3.0°C). |
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Dehumidification / Bulb Cargo Mode Parameter Selection |
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Initially Cd48 will display current Dehumidification Mode: bUlb (bulb cargo mode), dEhUM (normal dehumidification), or OFF. Pressing ENTER key will take the interface down into a hierarchy of parameter selection menus (mode, setpoint, evaporator speed, DTT setting). Pressing ENTER key in any parameter selection menu commits to selection of the currently displayed parameter and causes the interface to descend into the next parameter selection menu. All parameter selection menus alternate between a blank display and the current selection in the right hand display. Available parameters and parameter ranges are a function of configuration options and previously selected parameters as indicated above. Whenever any pre-trip test is initiated, Dehumidification Mode goes to OFF. Whenever Dehumidification Mode goes to OFF: •Dehumidification control setpoint goes to 0% RH internally but will then initialize to 95% RH when Dehumidification Mode leaves OFF. •Evaporator speed select goes to Alt for units without PWM Compressor Control (Cnf57 = Out), Evaporator speed select goes to Hi for units with PWM Compressor Control (Cnf57 = In). •DTT setting goes to 25.6°C or 18.0°C, depending on Cnf41. Whenever Dehumidification Mode is set to bUlb, DTT setting goes to 18.0°C if it had been set higher. Whenever Dehumidification Mode is set to dEhUM, DTT setting goes to 25.6°C or 18.0°C, depending on Cnf41. For units without PWM Compressor Control (Cnf57 = Out): •Whenever dehumidification control setpoint is set below 65% RH evaporator speed select goes to LO if it had been set to Hi. •Whenever dehumidification control setpoint is set above 64% RH evaporator speed select goes to Alt if it had been set to LO. For units with PWM Compressor Control (Cnf57 = In): •Whenever dehumidification control setpoint is set below 60% RH, the evaporator fan speed is set to LO, the user has the ability to set the evaporator fan speed to Hi via the keypad. Whenever dehumidification control setpoint is set equal to or above 60% RH, the evaporator fan speed is set to Hi, the user has the ability to set the evaporator fan speed to LO via the keypad. |
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Display Only Function - Cd49 is a display only function. |
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Days Since Last Successful Pre-Trip |
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Cd49 displays the number of days since last successful pre-trip sequence. Press ENTER to view the number of days since the last successful pre-trip for AUTO1, AUTO2, and AUTO3 in sequence. Press CODE SELECT to step back through the list and ultimately to exit the Cd49 display. |
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Configurable Functions - Cd50 through Cd53 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container. |
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QUEST Enable / Disable |
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Cd50 enables or disables QUEST Mode, which is a power saving option that reduces energy requirements. Cd50 applies to either QUEST or QUEST II, depending on which option was chosen for the particular unit. QUEST II provides additional savings over QUEST. Configuration variables CnF60 and CnF65 determine the QUEST option available for the unit. If the unit is not configured for QUEST Mode, then dashes will be displayed “-----”. Turn On QUEST Mode: Select “On” and press the ENTER key to enable QUEST Mode. When QUEST Mode is enabled: •Setpoint is maintained in Steady State Perishable mode after Perishable Pulldown. •QUEST cycles the compressor on and off according to Return Air temperature and dehumidification is not allowed. •QUEST II cycles the compressor or the heaters on and off according to Return Air temperature and dehumidification is allowed. QUEST Mode Suspended: If “On” is selected, QUEST operation may be suspended as indicated by one of the suspension codes listed below. If QUEST is not “OFF” and is not suspended, “On” will be displayed. ”SEtPt” = suspended by setpoint too low. ”CAHUM” = suspended by CA or humidity control. ”ACt” = suspended by ACT active. ”FAIL” = all return temperature probe failure for QUEST. ”PrtrP” = Pre-Trip Active. ”C LIM” = suspended by cool limit logic. ”PULL” = pulldown active. “ALArM ” = suspended by shutdown alarm Turn Off QUEST Mode: QUEST Mode is turned off automatically when any Trip Start occurs or Pre-Trip test is initiated. Select “OFF” and press ENTER to disable QUEST Mode manually. |
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Automatic Cold Treatment (ACT) Mode Parameter Selection |
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Cd51 controls the Automated Cold Treatment (ACT) Mode option, which is a method to simplify the task of completing cold treatment by automating the process of changing the setpoints. Cold treatment is an effective post-harvest method to control Mediterranean and certain other tropical fruit flies. If the unit is not configured for ACT or a valid probe setup is not detected (minimum of 3 USDA probes configured and detected), ACT can not be enabled. Cd51 will display dashes “-----”. Cd51 initially displays the countdown timer in days and hours remaining, regardless of whether it is enabled. In the Cd51 menu, pressing the ENTER key will take the interface down into a hierarchy of parameter selections. After the last parameter selection, pressing ENTER will return to “Cd 51”. Cd51 Parameter Selections: “Cd 51” | “X- X” (default “0-0”) || Countdown timer in days, hours “ACt” | “On” “OFF” or “----” (default “OFF“) || Enabled or disabled status “trEAt” | “X.X°C” (default “0.0°C“) || Cold treatment setpoint edited in increments of 0.1 degrees “DAyS” | “X” (default “0”) || 0 to 99 in increments of 1 “ProbE” | “XXXX” (default “----“) || Probe positions, ex: “1234” “SPnEW” | “X.X°C” (default “10.0°C“) || Setpoint after ACT, edited in increments of 0.1 degrees Turn On ACT: With “ACt” displayed, select “On” and press the ENTER key to enable ACT Mode. See Section 5.10.4 for detail procedure to set ACT values using Cd51. While ACT is On: •The left display will flash “COLd” and the right display will flash “trEAt”, and this will alternate between the unit setpoint and control temperature at 5 second intervals. Once ACT is successful, the cargo setpoint (SPnEW setting) will be displayed in the left display and control temperature in the right display, alternating with "COLd" "Done". This will continue until ACT is turned off. •ASC (Cd53) is disabled. ACT and ASC can not be enabled simultaneously. •Setpoint change via the keypad is disabled. •QUEST Mode is suspended but QUEST II can still operate. ACT Complete: When ACT has completed, including reaching the new setpoint, the 2nd selection in the Cd51 menu will display “done” on the left display and the MONTH DAY of completion on the right display. Turning ACT off clears this entry. This action also resets Cd51 to initial time remaining. ACT must then be turned on to view or modify the additional parameters. Turn Off ACT: ACT mode is turned off automatically when any Auto Pre-Trip test or Trip Start is initiated. With “ACt” displayed, select “OFF” and press the ENTER key to disable ACT Mode manually. |
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Automatic Setpoint Change (ASC) Mode Parameter Selection |
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Cd53 controls the Automated Setpoint Change (ASC) Mode option, which allows up to 6 setpoint changes to be pre-programmed over defined periods. If the unit is not configured for ASC, then this will not be allowed and Cd53 will display dashes “-----”. Cd53 initially displays the countdown timer in days and hours remaining in the right display, regardless of whether it is enabled. In the Cd53 menu, pressing the ENTER key takes the interface down into a hierarchy of parameter selections. After the last parameter selection, pressing the ENTER key will return to “Cd 53”. Cd53 Parameter Selections: “Cd 53” | “X- X” (default “0-0”) || Countdown timer in days, hours “ASC” | “On” “OFF” or “----” (default “OFF“) || Enabled or disabled status “nSC” | “X” (default “1“) || Number of setpoint changes, select from 1 to 6 “SP X” | “XX.X°C” (default “0.0°C”) || Setpoint edited in increments of 0.1 degrees “DAY (nSC-1)” | “X” (default “1“) || 1 to 99 in increments of 1 “SP (nSC)” | “X.X°C” (default “10.0°C“) || Setpoint after ACT, edited in increments of 0.1 degrees Turn On ASC: With “ASC” displayed, select “On” and press the ENTER key to enable ASC Mode. See Section 5.10.5 for detail procedure to set ASC values using Cd53. While ASC is On: •The left display will alternate between current unit setpoint and “ASC”. The right display will alternate between current control temperature and “ACtiV”. •ACT (Cd51) is disabled. ASC and ACT can not be enabled simultaneously. •QUEST Mode is suspended but QUEST II can still operate ASC Complete: At completion of ASC mode, the left hand display will alternate between current unit setpoint and “ASC”. The right hand display will alternate between current control temperature and “Done”. The display will remain this way until ASC is turned off. With ASC complete, the second entry in the Cd53 menu will show “done” in the left display, and the Month / Day of completion in the right display. Turn Off ASC: ASC Mode is turned Off automatically when any Auto Pre-Trip test or Trip Start is initiated. With “ASC” displayed, select “OFF” and press the ENTER key to disable ASC Mode manually. |
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Display Only Functions - Cd54 through Cd58 are display only functions. |
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Suction Port Superheat / Electronic Expansion Valve Status |
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Cd54 displays the reading for evaporator superheat (suction temperature minus suction saturation temperature as calculated from suction pressure) in the right display. Press the ENTER key at Cd54 to show the reading for EEV position (in %) in the left display. |
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Discharge Superheat |
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Cd55 displays the discharge superheat (discharge temperature minus discharge saturation temperature as calculated from discharge pressure) values in C /F as calculated by the discharge temperature minus the discharge saturation temperature as calculated from discharge pressure. If this selection is not valid, dashes “-----” will be displayed. |
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Water Pressure Switch / Condenser Fan Switch State or Override Logic State |
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Cd58 displays “CLOSE” if the WPS or CFS switch contacts are closed or if these options are not installed. “OPEn” is displayed when the WPS or CFS switch contacts are open. When the WPS/CFS Override Logic is “TRUE”, the right display will flash on all units. This is always the case, whether the unit has a WPS or CFS installed or not. NOTES: This CLOSE/OPEn state displayed in this Code Select function only applies to units that have the ability to detect the state of a WPS/CFS. This function should not be relied upon to display the condition of the switch on units that don’t have a WPS/CFS switch connected to ECG2 exclusively. The ability of the WPS/CFS Override Logic to control the condenser fan is limited. It is not possible for this logic to control the fan on units that have the WPS or CFS wired in series with the fan contactor. Units wired in this configuration can indicate that the WPS/CFS Override Logic is active by flashing the right display, however, the wiring will not allow for control of the condenser fan. |
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Configurable Functions - Cd59 through Cd65 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container. |
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Pump Down Logic |
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Cd59 allows setting of the pump down logic control. The display will flash between “STArT PdN” and “PrESS EnTEr”. Upon entering Cd59 the operator will be required to acknowledge that they want to initiate the pump down control. The display will flash between “STArT PdN” and “PrESS EnTEr”. Once the decision to continue is confirmed pump down logic will begin, and will take complete control of the unit until pump down either succeeds or fails. This operation can not be halted once it begins without power cycling the unit. After pump down logic has been initiated, the operator will be notified to close the Liquid Line Valve, the display will flash between “CLOSE LLV” and “PrESS EnTEr”. Once complete the display will read “P dN” to the left, and the current suction pressure to the right. If the automatic pump down logic succeeds within 20 minutes, the unit will turn itself off, and the display will notify the operator that pump down is complete by flashing between “P dN DOnE” and “SHUT OFF”. The operator must then shut off the unit. If the automatic pump down logic does not complete within 20 minutes, the unit will drop out of Cd59 and return to its previous control condition. |
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Evaporator Fan Pulsing Temperature Setting |
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Cd60 contains a selectable temperature range used to determine the engagement point of the Evaporator Fan Pulsing logic. Default setting is -18.1°C. The user may change the temperature by pressing ENTER, then scrolling to the desired temperature using either Arrow key. Press Enter to accept the change. The temperature setting will be retained until either a pre-trip or Trip Start is initiated at which time the temperature will set to the default setting. “-----” will be displayed if CnF68 is configured OUT. |
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High Speed Evaporator Fan Setting |
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Cd62 allows the evaporator fan speed to be forced to high while temperature control is being performed in the perishable setpoint range. When set to “On”, evaporator fans operate in high speed regardless of any other active option that can control evaporator fan speed. Following a power cycle, the state of the function select code is retained at its state prior to the power cycle. If “On”, this function select code will be set to “OFF” when any Trip Start occurs or any pre-trip test is initiated. “-----” will be displayed if setpoint is in frozen range or if CnF66 is configured OFF. |
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FuelWise |
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Cd63 controls FuelWise Mode, which is an option that saves energy while operating in the perishable setpoint range. When operating in the frozen setpoint range, Frozen Economy Mode complements FuelWise. Note: FuelWise was previously referred to as Enhanced Economy Mode. If the unit is not configured for FuelWise, then this will not be allowed and Cd63 will display dashes “-----”. Following a power cycle, the state of the function select code is retained at its state prior to the power cycle if CNF72 = Default ON else if Default OFF this will be set to OFF. Turn On FuelWise: Select “On” and press the ENTER key to enable FuelWise Mode. Turn Off FuelWise: FuelWise Mode is turned off automatically when any Trip Start occurs or Pre-Trip test is initiated. Select “OFF” and press ENTER to disable FuelWise Mode manually. |
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TripWise Setting |
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Cd65 controls TripWise Mode, which is an option that can run software logic to check whether a standard Pre-trip Inspection (PTI) is needed and skip unless necessary. If the unit is not configured for TripWise, then this will not be allowed and Cd65 will display dashes “-----”. Turn On TripWise: Select “On” and press the ENTER key to enable TripWise Mode. See Section 5.10.2 for detail procedure to set TripWise values using Cd53. Turn Off TripWise: Select “OFF” and press the ENTER key to disable TripWise Mode manually. Checking TripWise Status: To check the status of the container, press the PRE-TRIP key on the keypad. The message “SELCt | PrtrP” will appear on the display module, alternating with one of the following TripWise status messages: •trIPW | OFF. The TripWise option is turned off. •trIPW | EX (Expired). It is recommended to pre-trip the unit prior to the unit's next trip following customer-specific guidelines. • trIPW | PASS. The container should be ready for use after the operator has conducted a visual inspection. Standard PTI is not required. •trIPW | CHECK. If any TripWise test(s) execute and do not meet the pass / fail requirements, It is recommended to pre-trip the unit following customer-specific guidelines prior to the unit's next trip |
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Display Only Functions - Cd66 and Cd67 are display only functions. |
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Instantaneous Power (kW) |
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Cd66 displays real power currently being used by the system in kW. |
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Total Power (kW-hr) |
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Cd67 displays energy used by the system since last Trip Start in kW-hrs. |
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Configurable Functions - Cd70 through Cd75 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container. |
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Temperature Setpoint Lock |
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Cd70 enables or disables the Temperature Setpoint Lock feature. When set to “On”, this will prevent setpoint change from the keypad. The default setting is “OFF”. An event will be recorded in the DataCorder each time an action is taken at Cd70. Turn On Setpoint Lock: Press the ENTER key. Use the Arrow keys to select “On” and press ENTER to confirm. If Cd70 is set to “On” and a setpoint change is attempted with the keypad, |“SPLk” | “On” | is displayed for five seconds to show that setpoint lock is turned On. Turn Off Setpoint Lock: Press the ENTER key. Use the Arrow keys to select “OFF” and press ENTER to confirm. Cd70 will automatically be set to “OFF” with the selection of PTI or a TripWise on the unit. |
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Pharma Mode |
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Cd75 controls the Pharma Mode option, which allows cargoes to be maintained at temperature setpoints of either 5°C (41°F) or 20°C (68°F), while maintaining lower humidity levels. Pharma mode is an available option for units that have installed software versions 5381 or higher and a humidity sensor that has not been disabled. Cd75 will show dashes “-----” if software version and humidity sensor state are not applicable. Turn On Pharma Mode: Select “On” and press the ENTER key. Use the Arrow keys to choose your selected setpoint of “05” or “20” and then press ENTER to confirm. While Pharma Mode is On: •The left display toggles between Pharma setpoint and "PhArM". The right display shows the Return Temperature Sensor (RTS) reading. •The controller maintains the Return Air Temperature at setpoint, the yellow RETURN indicator light is illuminated. •The unit operates in a normal perishable control mode, while disabling any power saving features such as QUEST, etc. •Keypad entries such as MANUAL DEFROST, PRE-TRIP and setpoint temperature change are locked out. If setpoint temperature change is attempted, then display will show "SpLK On". •Function codes related to operating modes are disabled and show dashes "-----" (Cd33, Cd34, Cd35, Cd36, Cd37, Cd41, Cd48 Cd50, Cd51, Cd53 Cd63, Cd65). Turn Off Pharma Mode: To disable Pharma Mode manually at Cd75, use the Arrow keys to select “OFF” and press ENTER to confirm. |
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General operation sequences for cooling, heating and defrost are described in the following paragraphs.
Operational software responds to various inputs. These inputs come from the temperature sensors and pressure transducers, the temperature setpoint, the settings of the configuration variables and the function code assignments. The action taken by the operational software changes as the input values change. Overall interaction of the inputs is described as a “mode” of operation. The modes of operation include perishable (chill) mode and frozen mode. Descriptions of the controller interaction and modes of operation are provided in the following sub paragraphs.
4.3.1Start Up - Compressor Phase Sequence
At start up, the controller logic checks for proper phase sequencing and compressor rotation. If incorrect sequencing is causing the compressor and three-phase evaporator fan motors to rotate in the wrong direction, the controller will energize or de-energize relay TCP as required. Relay TCP will switch its contacts, energizing or de-energizing relays PA and PB. Relay PA is wired to energize the circuits on L1, L2 and L3. Relay PB is wired to energize the circuits on L3, L2, and L1, thus providing reverse rotation.
4.3.2Start Up - Compressor Bump Start
At start up, the controller logic will initiate a compressor bump start procedure to clear liquid refrigerant from the compressor. If suction and discharge pressures have equalized, the compressor will perform three compressor bump starts. A compressor bump start may also occur after a defrost cycle has been completed.
During bump start, the EEV will close. Relays TS, TQ, TN, TE, and TV will be de-energized (opened). The result of this action will close the ESV and shut all fans off. The compressor will start for 1 second, then pause for five seconds. This sequence will be repeated two more times. After the final bump start, the unit will pre-position the EEV to the correct starting position, pause and then start up.
4.3.3Perishable Mode Temperature Control
In Perishable mode, the controller maintains the supply air temperature at setpoint, the SUPPLY indicator light is illuminated and the default reading on the display window is the supply temperature sensor reading.
When the supply air temperature enters the in-range temperature tolerance (Cd30), the green IN-RANGE light will energize. When CnF26 (Heat Lockout Temperature) is set to -10°C, Perishable mode is active with setpoints above -10°C (+14°F). When CnF26 is set to -5°C, Perishable mode is active with setpoints above -5°C (+23°F).
When the system is in Perishable Pulldown mode, the highest priority is given to bringing the container down to setpoint. When cooling from a temperature that is more than 2.5°C (4.5°F) above setpoint, the system will be in Perishable Pulldown mode in economized operation. However, pressure and current limit functions may restrict the valve if either exceeds the preset value.
In Perishable Steady State mode, the control temperature is maintained near a setpoint that is above the heat lockout temperature. Once setpoint is reached, the unit will transition to Perishable Steady State mode. This results in unloaded operation by cycling the DUV to limit capacity and maintain steady temperature control.
The unit is capable of maintaining supply air temperature to within +/- 0.2°C (+/- 0.36°F) of setpoint. Supply air temperature is controlled by positioning of the electronic expansion valve (EEV), cycling of the digital unloader valve (DUV), cycling of the compressor, and cycling of the heaters.
4.3.6Perishable Idle, Air Circulation
When it is unnecessary to run the compressor to maintain control temperature, the system enters Perishable Idle mode. If the controller has determined that cooling is not required or the controller logic determines suction pressure is at the low pressure limit, the unit will transition to Perishable Idle mode. During Perishable Idle mode, the compressor is turned off, but the evaporator fans continue to run to circulate air throughout the container. If temperature rises +0.2°C (0.4°F) above setpoint, the unit will transition back to Perishable Steady State mode.
When it is necessary to raise the control temperature, the system will enter Perishable Heating mode. If the temperature drops to 0.5°C (0.9°F) below setpoint, the unit will transition to Perishable Heating mode, and the heaters will be energized. The unit will transition back to Perishable Idle mode when the temperature rises to 0.2°C (0.4°F) below the setpoint, and the heaters will de-energize.
Figure 4.3 Controller Operation - Perishable Mode
4.3.8Perishable Dehumidification
Dehumidification is provided to reduce the humidity levels inside the container. The dehumidification setpoint range is from 50% to 95%. Dehumidification is activated when a humidity value is set at Cd33. The yellow SUPPLY LED will flash ON and OFF every second to indicate that Dehumidification is active. Once Dehumidification is active and the following conditions are satisfied, the controller will activate the heat relay to begin Dehumidification.
•The humidity sensor reading is above the humidity setpoint (Cd33).
•The unit is in Perishable Steady State and supply air temperature is less than 0.25°C (0.45°F) above setpoint.
•The heater debounce timer (three minutes) has timed out.
•Heater Termination Thermostat (HTT) is closed.
If the above conditions are true for at least one hour, the evaporator fans will switch from high speed to low speed. Evaporator fan speed will then switch every hour, as long as the four conditions are met. See Bulb mode, Section 4.3.9, for different evaporator fan speed options.
If any condition except item (1) becomes false OR if the relative humidity sensed is 2% below the dehumidification setpoint, the high speed evaporator fans will be energized.
During dehumidification, power is applied to the defrost heaters. This added heat load causes the controller to open the EEV to match the increased heat load while still holding the supply air temperature very close to the setpoint.
Opening the EEV reduces the temperature of the evaporator coil surface, which increases the rate at which water is condensed and removes water from the passing air. Removing water from the air reduces the relative humidity. When the relative humidity sensed is 2% below setpoint, the controller de-energizes the heat relay. The controller will continue to cycle heating to maintain relative humidity below the selected setpoint. If dehumidification is terminated by a condition other than the humidity sensor, e.g., an out-of-range or compressor shutdown condition, the heat relay is de-energized immediately.
Two timers are activated during dehumidification to prevent rapid cycling and consequent contactor wear:
1.Heater debounce timer (three minutes) - The heater debounce timer is started whenever the heater contactor status is changed. The heat contactor remains energized (or de-energized) for at least three minutes even if the setpoint criteria are satisfied.
2.Out-of-range timer (five minutes) - The out-of-range timer is started to maintain heater operation during a temporary out-of-range condition. If supply air temperature remains outside of the user selected in-range setting for more than five minutes, the heaters will be de-energized to allow the system to recover. The out-of-range timer starts as soon as temperature exceeds in-range tolerance value set by Cd30.
4.3.9Perishable Dehumidification - Bulb Mode
Bulb mode is an extension of dehumidification which allows changes to the evaporator fan speed and/or defrost termination setpoints.
Bulb mode is active when Cd35 is set to “Bulb.” Once Bulb mode is activated, the user may then change dehumidification evaporator fan operation from the default (speed alternates from low to high each hour) to constant low or constant high speed. This is done by toggling Cd36 from its default of “alt” to “Lo” or “Hi” as desired. If low speed evaporator fan operation is selected, this gives the user the additional capability of selecting dehumidification setpoints from 50 to 95%.
In addition, if Bulb mode is active, Cd37 may be set to override the previous defrost termination thermostat (DTT) settings. The temperature at which the DTT will be considered “open” may be changed [in 0.1°C (0.2°F) increments] to any value between 25.6°C (78°F) and 4°C (39.2°F). The temperature at which the DTT is considered closed for interval timer start or demand defrost is 10°C (50°F) for “open” values from 25.6°C (78°F) down to a 10°C (50°F) setting. For “open” values lower than 10°C, the “closed” values will decrease to the same value as the “open” setting. Bulb mode is terminated when:
•Bulb mode code Cd35 is set to “Nor.”
•Dehumidification code Cd33 is set to “Off.”
•The user changes the setpoint to one that is in the frozen range.
When Bulb mode is disabled by any of the above conditions, evaporator fan operation for dehumidification reverts to “alt” and the DTS termination setting resets to the value determined by CnF41.
Economy Fan mode is an extension of the Perishable mode, and is provided for power saving purposes. Economy Fan mode is activated when Cd34 (also used for Frozen Economy mode) is set to “ON.” Economy Fan mode is used in the transportation of temperature-tolerant cargo or non-respiration items which do not require high airflow for removing respiration heat.
There is no active display that indicates that Economy Fan mode has been initiated. To check for Economy Fan mode, perform a manual display of Cd34.
In order to initiate Economy Fan mode, a perishable setpoint must be selected prior to activation. When Economy Fan mode is active, the evaporator fans will be controlled as follows:
a.At the start of each cooling or heating cycle, the evaporator fans will run in high speed for three minutes.
b.They will then be switched to low speed any time the supply air temperature is within +/- 0.2°C (0.36°F) of the setpoint and the return air temperature is less than or equal to the supply air temperature + 3°C (5.4°F).
c.The fans will continue to run in low speed for one hour.
d.At the end of the hour, the evaporator fans will switch back to high speed and the cycle will be repeated. If Bulb mode is active, Economy Fan mode will be overridden.
4.3.11Perishable Mode Cooling - Sequence of Operation
In Standard Perishable mode, the evaporator motors run in high speed. In Economy Fan mode, the fan speed is varied.
a.When supply air temperature is above setpoint and decreasing, the unit will cool with the condenser fan motor (CF), compressor motor (CH), and evaporator fan motors (EF) energized, and the white COOL light illuminated (see Figure 4.4). Also, if current or pressure limiting is not active, the controller will close contacts TS to open the economizer solenoid valve (ESV) and place the unit in economized operation.
Figure 4.4 Perishable Mode Cooling
b.When supply air temperature decreases to a predetermined tolerance above setpoint (Cd30), the green IN RANGE light is illuminated.
c.As air temperature continues to fall, unloaded cooling starts (DUV pulses opens) as the supply air temperature approaches setpoint (see Figure 4.3).
d.When unloaded cooling starts, EEV control will transition from a full cool superheat setpoint to a lower modulated cool superheat setpoint. Once unloading starts, the EEV controls evaporator superheat based on the system duty cycle where instantaneous superheat will vary.
e.When the supply air temperature has fallen to within 1.9°C (3.4°F) of setpoint temperature and the average capacity of the system has fallen below 70%, the unit will open contacts TS to close the ESV and take the unit out of economized operation.
f.The controller continuously monitors supply air temperature. Once the supply air temperature falls below setpoint, the controller periodically records supply air temperature, setpoint and time. A calculation is then performed to determine temperature drift from setpoint over time. If the calculation determines that cooling is no longer required, contacts TC and TN are opened to de-energize the compressor motor and the condenser fan motor. In addition the controller will close the EEV.
g.The evaporator fan motors continue to run to circulate air throughout the container. The green IN RANGE light remains illuminated as long as the supply air temperature is within tolerance of the setpoint.
h.If the supply air temperature increases to 1.0°C (1.8°F) above setpoint and three minutes have elapsed, contacts TC and TN close to restart the compressor and condenser fan motors in standard mode (non-economized) operation. The white COOL light is also illuminated.
i.If the average system capacity has risen to 100% during unloaded cooling and three minutes off time has elapsed, relay TS will energize to open the ESV, placing the unit in economized mode.
j.If the supply air increases more than 2.5°C (4.5°F) above setpoint temperature, the microprocessor will transition the evaporator superheat control from modulation back to full cool control.
4.3.12Perishable Mode Heating - Sequence of Operation
a.If the supply air temperature decreases 0.5°C (0.9°F) below setpoint, the system enters the heating mode (see Figure 4.3). The controller closes contacts TH (see Figure 4.5) to allow power flow through the heat termination thermostat (HTT) to energize the heaters (HR). The orange HEAT light is also illuminated. The evaporator fans continue to run to circulate air throughout the container.
b.When the supply air temperature rises to 0.2°C (0.4°F) below setpoint, contact TH opens to de-energize the heaters. The orange HEAT light is also de-energized. The evaporator fans continue to run to circulate air throughout the container.
c.The safety heater termination thermostat (HTT) is attached to an evaporator coil circuit and will open the heating circuit if overheating occurs.
Figure 4.5 Perishable Mode Heating
The EEV and DUV are independently operated by the microprocessor. For full diagrams and legend, see Section 8.
4.3.13Perishable Mode - Trim Heat
If the system capacity has been decreased to the lowest allowable capacity and conditions exist that warrant maximum temperature stability the controller will pulse the HR relay to energize the evaporator heaters in sequence with the compressor digital signal.
4.3.14Frozen Mode - Temperature Control
In Frozen mode, the controller maintains the return air temperature at setpoint, the yellow RETURN indicator light is illuminated, and the default reading on the display window is the return temperature sensor (RTS) reading. When the return air temperature enters the in-range temperature tolerance (Cd30), the green IN-RANGE light will energize.
When CnF26 (Heat Lockout Temperature) is set to -10°C, frozen mode is active with setpoints below -10°C (+14°F). When CnF26 is set to -5°C, frozen mode is active with setpoints below -5°C (+23°F).
When the system is in Frozen mode, the highest priority is given to bringing the container down to setpoint, the system will remain in economized operation.
Frozen cargos are not sensitive to minor temperature changes, and the frozen temperature control system takes advantage of this to greatly improve the energy efficiency of the unit. Frozen range temperature control is accomplished by cycling the compressor on and off as the load demand requires.
Once the frozen setpoint is reached, the unit will transition to frozen steady state (economized operation).
When temperature drops to setpoint minus 0.2°C (0.4°F) and the compressor has run for at least five minutes, the unit will transition to the Frozen Idle mode. The compressor is turned off and the evaporator fans continue to run to circulate air throughout the container. If temperature rises above setpoint +0.2°C, (0.4°F) the unit will transition back to the frozen steady state mode.
Figure 4.6 Controller Operation - Frozen Mode
If the temperature drops 10°C (18°F) below setpoint, the unit will transition to the Frozen “Heating” mode. The evaporator fans are brought to high speed, and the heat from the fans is circulated through the container. The unit will transition back to Frozen Steady State when the temperature rises back to the transition point.
In order to activate Frozen Economy mode, a frozen setpoint temperature must be selected, and Cd34 (Economy Mode) set to “ON.” When economy mode is active, the system will perform normal frozen mode operations except that the entire refrigeration system, excluding the controller, will be turned off when the control temperature is less than or equal to the setpoint -2°C (4°F).
After an off-cycle period of 60 minutes, the unit will turn on high speed evaporator fans for three minutes, and then check the control temperature. If the control temperature is greater than or equal to the frozen setpoint +0.2°C (0.4°F), the unit will restart the refrigeration system and continue to cool until the off-cycle temperature criteria are met. If the control temperature is less than the frozen setpoint +0.2°C (0.4°F) the unit will turn off the evaporator fans and restart another 60 minute off-cycle.
4.3.19Frozen Mode Cooling - Sequence of Operation
a.When the return air temperature is above setpoint and decreasing, the unit will transition to economized cooling with the condenser fan motor (CF), compressor motor (CH), economizer solenoid valve (ESV), low speed evaporator fan motors (ES) energized and the white COOL light illuminated (see Figure 4.7).
b.When the return air temperature decreases to a predetermined tolerance above setpoint, the green INRANGE light is illuminated.
c.When the return air temperature decreases to 0.2°C (0.4°F) below setpoint, contacts TC, TS and TN are opened to de-energize the compressor, economizer solenoid valve and condenser fan motor. The white COOL light is also de-energized. The EEV will close.
d.The evaporator fan motors continue to run in low speed to circulate air throughout the container. The green IN-RANGE light remains illuminated as long as the return air is within tolerance of setpoint.
e.If return air temperature drops to 10°C (18°F) or more below setpoint, the evaporator fans switch to high speed.
f.When the return air temperature increases to 0.2°C (0.4°F) above setpoint and three minutes have elapsed, the EEV opens and contacts TC, TS and TN close to restart the compressor, open the ESV and restart the condenser fan motor. The white COOL is illuminated.
The EEV and DUV are independently operated by the microprocessor. Complete schematics and legends are located in Section 8.
Defrost is initiated to remove ice buildup from the evaporator coil which can obstruct air flow and reduce the cooling capacity of the unit. The defrost cycle may consist of up to three distinct operations depending upon the reason for the defrost or model number configuration. The first is de-icing of the coil, the second is defrost due to a probe check cycle and the third is a snap freeze process based on the unit model configuration.
•De-icing the coil consists of removing power to the cooling components (compressor, evaporator fans, and condenser fan), closing the EEV, and turning on the heaters, which are located below the evaporator coil. During normal operation, de-icing will continue until temperatures indicate that the ice on the coil has been removed, proper air flow has been restored, and the unit is ready to control temperature efficiently.
•If defrost was initiated by the probe check logic, then the Probe Check is carried out after the completion of the defrost cycle. A Probe Check is initiated only when there is an inaccuracy between the controller temperature sensors.
•Snap Freeze allows the system to cool for a period of time after de-icing, with the evaporator fans turned off and is only carried out if configured by model number. Snap-Freeze allows for the removal of latent de-icing heat from the evaporator coils, and freezes any remaining moisture that might otherwise be blown into the container.
For more information on Probe Check and Probe Diagnostics, see Section 5.9.
Initiation of defrost is dependent on the state of the Defrost Temperature Sensor (DTS). When the DTS senses a temperature less than 10°C (50°F), the defrost options become active and the timer is engaged for the initiation of the defrost cycle. The defrost time accumulates when the compressor is running. In the perishable mode this is the same as real time as the compressor in general runs continuously. In frozen mode the actual time necessary to count down to the next defrost will exceed the defrost interval depending on the compressor duty-cycle.
When the defrost mode is in the active state, defrost can be initiated when any one of the following additional conditions become true:
1.Manually: While in the Defrost screen,
when the Manual Defrost soft key is selected, if conditions will allow
for a defrost, a manual defrost is initiated. The Defrost Indicator light
is lit, and the user is brought back to the Main / Default screen.
While in the Defrost screen, when Manual Defrost soft key is selected,
and conditions will NOT allow a defrost, a pop up message screen appears.
2.Timer: The Defrost Interval Timer reaches the user selectable Interval. The user-selected intervals are 3, 6, 9, 12, 24 Hours, Off, AUTO, Pulse, or AUTO2; factory default is AUTO. See Defrost Interval setting on the Trip Settings screen.
a.Automatic defrost starts with an initial defrost at three hours and then adjusts the interval to the next defrost based on the accumulation of ice on the evaporator coil. Following a start-up or after termination of defrost, the time will not begin counting down until the DTS reading falls below 10°C (50°F). If the reading of DTS rises above termination setting any time during the timer count down, the interval is reset and the countdown starts over. The Auto defrost time is reset to three hours start time after every PTI initiation or Trip Start interval.
b.Fan Pulsing Logic is used to help prevent ice formation in the drain gutter and drain cup and ice buildup in supply air channel by using the evaporator fans to blow the warm air onto these areas during unit defrost. When cooling at lower set points, evaporator fan pulsing can be used during Defrost/De-ice when the “Pulse” option is selected for the Defrost Interval setting on the Trip Settings screen. When enabled, evaporator fan pulsing will occur based on the unit temperature set point and the Evap Fan Pulsing Temp setting on the Trip Settings screen. QUEST II also pulses the evaporator fans during Defrost/De-ice within a narrow perishable set point range. The logic for each evaporator fan pulsing feature is described below.
c.After a new Defrost Interval is selected, the previously selected Interval is used until the next defrost termination, the next time the DTS contacts are OPEN, or the next time power to the control is interrupted. If the previous value or the new value is “OFF”, the newly selected value will be used immediately.
3.Probe Check: If defrost is initiated due to Probe Check immediately following the defrost cycle the evaporation fans are started and run for eight minutes to stabilize the temperature throughout the container. A probe check comparison is carried out at the end of the eight minute period if any sensor is found out of calibration. At this time its alarm set is no longer used for control/reorder purposes.
4.Probe Check Logic: The logic determines that a Probe Check is necessary based on temperature values currently reported by the supply and return probes
5.Delta T Logic: If the difference between return and supply air temperature (Delta T) becomes too great indicating possible reduced airflow over the evaporator coil caused by ice buildup requiring a defrost.
a.In Perishable Pull Down - Delta T increases to greater than 12°C, and 90 minutes of compressor run time have been recorded.
b.In Perishable Steady State – A baseline Delta T is recorded following the first defrost cycle after steady state conditions are reached, (the unit is cooling, and the evaporator fans and heaters must remain in a stable state for a period of five minutes). Defrost will be initiated if Delta T increases to greater than 4°C above the baseline, and 90 minutes of compressor run time have been recorded.
c.In Frozen Mode - Defrost will be initiated if Delta T increases to greater than 16°C and 90 minutes of compressor run time have been recorded.
When defrost is initiated, the controller closes the EEV, opens contacts TC, TN and TE (or TV) to de-energize the compressor, condenser fan and evaporator fans. The controller then closes contacts TH to supply power to the heaters. The orange DEFROST light and heat light are illuminated and the COOL light is also de-energized.
The EEV and DUV are independently operated by the microprocessor. Complete schematics and legends are located in Section 9.
Defrost will terminate when the DTS reading rises above one of two model number configurable options selection, either an upper setting of 25.6°C (78°F) which is default or lower setting of 18°C (64°F). When the DTS reading rises to the configured setting, the de-icing operation is terminated.
4.3.22Defrost Related Settings
Defrost Temperature Sensor (DTS) Failure
When the return air temperature falls to 7°C (45°F), the controller ensures that the defrost temperature sensor (DTS) reading has dropped to 10°C or below. If it has not, it indicates a failed DTS. A DTS failure alarm is triggered and the defrost mode is operated by the return temperature sensor (RTS). Defrost will terminate after 1 hour.
If the DTS fails to reach is termination setting, the defrost terminate after 2 hours of operation.
If CnF23 is configured to “SAv” (save), then the value of the defrost interval timer will be saved at power down and restored at power up. This option prevents short power interruptions from resetting an almost expired defrost interval, and possibly delaying a needed defrost cycle. If the save option is not selected the defrost timer will re-initiate and begin recounting.
If CnF11 is model number configured to OFF the operator will be allowed to choose “OFF” as a defrost interval option.
If CnF64 is configured in the operator will be allowed to choose “PuLS” as a defrost interval option. For units operating with “PuLS” selected, defrost interval is determined by the unit temperature set point and the Evap Fan Pulsing Temp setting on the Trip Settings screen. When the unit temperature set point is equal to or less than the Evaporator Fan Pulsing Temperature Setting, the defrost interval is set to 6 hours. Otherwise, the defrost interval is determined using the Automatic Defrost Interval Determination logic. In either case, “PuLS” remains displayed in this function select code.
If any Auto Pretrip sequence is initiated, the Defrost Interval setting will be set to ’AUTO’ unless CnF49 (OEM Reset) is set to “Custom” AND CnF64 (Evaporator Fan Pulsing Logic) configuration variable is set to IN, in which case the Defrost Interval setting on the Trip Settings screen will be set to “Pulse”.
If defrost does not terminate correctly and temperature reaches the set point of the Heat Termination Thermostat (HTT) 54°C (130°F), the HTT will open to de-energize the heaters (AL059 & AL060). If the HTT does not open and termination does not occur within two hours, the controller will terminate defrost. AL060 will be activated to inform of a possible DTS failure.
4.3.23Protection Modes of Operation
Evaporator Fan Operation
Opening of an evaporator fan internal protector will shut down the unit.
Failure Action
Function code Cd29 may be operator set to select the action the controller will take upon a system failure. The factory default is full system shutdown. See Table 4–4.
Function codes Cd31 (Stagger Start, Offset Time) and Cd32 (Current Limit) may be operator set to control the start up sequence of multiple units and operating current draw. The factory default allows on demand starting (no delay) of units and normal current draw. See Table 4–4.
Compressor High Temperature Protection
The controller continuously monitors compressor discharge pressure and temperature, and suction pressure. If discharge pressure or temperature rises above the allowed limit or suction pressure falls below the allowed limit, the compressor will be cycled off and on every 3 minutes. Condenser and evaporator fans will continue to operate during the compressor off cycle.
If high compressor dome temperature occurs, as measured by the CPDS, the controller will allow additional refrigerant to be released into the system in order to provide cooling to the evaporator coil and compressor dome. The controller is alerted to high compressor dome temperatures via the CPDS when ambient temperature is greater than 43.3°C (110°F), return air temperature is less than -17.5°C (0.5°F) and the compressor discharge temperature is greater than 117.7°C (244°F).
Dome temperature control logic will disengage when return air temperature and ambient temperature return to allowed limits or when the compressor turns off.
Compressor Low Pressure Protection
If the suction pressure low limit is triggered, the DUV will energize to raise the suction pressure.
Perishable Mode - System Pressure Regulation
In Perishable mode, system pressures may need to be regulated at ambient temperatures of 20°C (68°F) and below. Once below this ambient temperature, the condenser fan may cycle on and off based on limits imposed for discharge pressure. For extremely cold ambient temperatures, -18°C (0°F), heater cycling may occur within normal system operation based on discharge pressure limits.
Condenser Fan Override
When CnF17 (Discharge Temperature Sensor) is set to “In” and CnF48 (Condenser Fan Switch Override) is set to “On”, the condenser fan switch override logic is activated. If condenser cooling water pressure is sufficient to open the water pressure switch (de-energizing the condenser fan) when water flow or pressure conditions are not maintaining discharge temperature, the logic will energize the condenser fan as follows:
1.If the DUV is less than 80% open when the controller calls for it to be100% open, the condenser fan is energized. When the DUV is 100% open, the fan will de-energize.
2.If DPT reading is invalid or out of range (AL65), the condenser fan is energized and will remain energized until system power is cycled.
3.If the system is running on condenser fan override and the high pressure switch opens, the condenser fan is energized and will remain energized until the system power is cycled.
QUEST is a method of temperature control using compressor-cycle during steady-state perishable cooling (also referred to as Compressor-Cycle Perishable Cooling, CCPC) that cycles the compressor on and off according to return air temperature.
To be eligible for steady-state control, the unit must first complete a setpoint pulldown phase and a QUEST pulldown phase:
•During setpoint pulldown, supply air temperature is controlled according to the unit’s nominal supply air setpoint.
•During QUEST pulldown, supply air temperature is lowered somewhat relative to the nominal setpoint. Evaporator fans are forced to operate at high speed.
Steady-state QUEST mode control maintains the same lowered supply air temperature that was used during QUEST pulldown. The compressor cycles on and off according to return air high and low limits. Depending on the fan mode of operation selected, the evaporator fans may be programmed to run at low speed some or all of the time according to the control logic.
Alarm display is an independent controller software function. If an operating parameter is outside of expected range or a component does not return the correct signals back to the controller, an alarm is generated. A listing of alarms is described in Table 4–5.
The alarm philosophy balances the protection of the refrigeration unit and that of the refrigerated cargo. The action taken when an error is detected always considers the survival of the cargo. Rechecks are made to confirm that an error actually exists.
Some alarms requiring compressor shutdown have time delays before and after to try to keep the compressor on line. An example is alarm code “LO,” (low main voltage), when a voltage drop of over 25% occurs, an indication is given on the display, but the unit will continue to run.
When an Alarm Occurs:
•The red alarm light will illuminate for alarm code numbers 15, 17, 20, 21, 22, 23, 24, 25, 26, and 27.
•If a detectable problem exists, its alarm code will be alternately displayed with the setpoint on the left display.
•The user should scroll through the alarm list to determine what alarms exist or have existed. Alarms must be diagnosed and corrected before the Alarm List can be cleared.
To Display Alarm Codes:
1.While in the Default Display mode, press the ALARM LIST key. This accesses the Alarm List Display mode, which displays any alarms archived in the alarm queue.
2.The alarm queue stores up to 16 alarms in the sequence in which they occurred. The user may scroll through the list by pressing an Arrow key.
3.The left display will show “AL##,” where ## is the alarm number sequentially in the queue.
4.The right display will show the actual alarm code. “AA##” will display for an active alarm, where “##” is the alarm code. Or “IA##” will display for an inactive alarm. See Table 4–5 for alarm listing.
5.“END” is displayed to indicate the end of the alarm list if any alarms are active.
6.“CLEAr” is displayed if all alarms are inactive. The alarm queue may then be cleared by pressing ENTER. The alarm list will clear and “-----” will be displayed.
AL26 is active when none of the sensors are responding. Check the connector at the back of the controller, if it is loose or unplugged, reconnect it, then run a pre-trip test (P5) to clear AL26.
Loss of Superheat Control |
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Cause: |
Superheat has remained below 1.66°C (3°F) degrees for five minutes continuously while compressor running. Compressor drawing more than 2.0 amps, compressor pressure ratio is greater than 1.8, and Electronic Expansion Valve (EEV) is at 0% open. |
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|
Component |
Electronic Expansion Valve (EEV) |
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Troubleshooting |
Check the operation of the EEV at code Cd41. |
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Corrective Action |
Replace EEV if defective. |
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Component |
Evaporator Temperature Sensor(s) ETS & ETS1. |
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Troubleshooting |
Verify accuracy of temperature sensors. See Sensor Checkout Procedure Section 7.29.2. |
|
Corrective Action |
Replace ETS or ETS1 if defective. |
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Component |
Evaporator Fans |
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Troubleshooting |
Confirm fans operating properly |
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Corrective Action |
Replace fan(s) if defective. See Evaporator Fan Motor Assembly Section 7.17. |
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Manual Defrost Switch Failure |
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Cause: |
Controller has detected continuous Manual Defrost Switch activity for five minutes or more. |
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Component |
Keypad |
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Troubleshooting |
Power cycle the unit. |
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Corrective Action |
Resetting the unit may correct problem, monitor the unit. If the alarm reappears after 5 minutes, replace the keypad. |
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Keypad or Keypad Harness Fail |
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Cause: |
Controller has detected one of the keypad keys is continuously activity. |
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Component |
Keypad or Harness |
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Troubleshooting |
Power cycle the unit. |
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Corrective Action |
Resetting the unit may correct problem, monitor the unit. If the alarm reappears, replace the keypad and harness. |
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Fresh Air Vent Open |
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Cause: |
For units equipped with XtendFRESH and a Vent Position Sensor (VPS) , the controller will monitor the manual fresh air opening at a pre-determined time. If during this time the fresh air vent is open and XtendFRESH is active, an alarm will be generated. If alarm is active, the controller monitors the manual fresh air once per hour. Upon clearing the alarm, the controller goes back to monitoring at the pre-determined time. |
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Component |
Vent Position Sensor (VPS) |
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Troubleshooting |
Manually reposition vent to 0% and confirm at code Cd45. If Cd45 is not reading 0%, perform a calibration of the panel. See VPS Service Section 7.30. |
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Corrective Action |
If unable to obtain a zero reading, replace the defective VPS. If unit is loaded, ensure vent is closed. Note and replace VPS on next PTI. The alarm will not affect the XtendFRESH system from operating. |
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High Compressor Pressure Ratio |
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Cause: |
Controller detects discharge pressure to suction pressure ratio is too high. The controller will attempt to correct the situation by restarting the compressor. |
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Component |
Discharge Pressure Transducer (DPT) |
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Troubleshooting |
Confirm accurate DPT pressure readings. See Manifold Gauge Set Section 7.2. |
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Corrective Action |
Replace DPT if defective. |
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O2 Sensor Failure |
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Cause: |
Triggered anytime the O2 sensor reading is outside of the normal operation range, after an initial signal was detected. |
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Component |
O2 Sensor, O2 Amplifier, Sensor Switch Module (if equipped) |
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Troubleshooting |
Check Cd44 and scroll down to 02V. The O2 sensor output will be displayed in millivolts (130mV to 4100mV). Switch equipped: If voltage is not present at Cd44 and a sensor switch module is installed, check for O2 voltage on the black wire connected to the sensor switch module, connecting ground of meter to TP9. If the voltage is in the 130mV to 4.1V range, directly wire the black wire to KD04. This may cause an AL07 depending on O2 reading but XtendFRESH will operate normally. If no voltage on the black wire, proceed to next step. Check wiring (see schematic), and correct if found mis-wired. If O2 sensor is available, remove the upper fresh air panel and evaporator motor and replace the sensor. If after replacing sensor AL09 continues, replace amplifier. If parts are not available, turn XtendFRESH option off at code Cd43 and open the Manual Fresh Air Vent. |
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CO2 Sensor Failure |
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Cause: |
Triggered anytime the CO2 sensor reading is outside of the normal operation range, after an initial signal was detected. |
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Component |
CO2 Sensor |
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Troubleshooting |
Check the voltage at MC5 to the ground pin on TP9 (1 - 4.7 vdc). Check wiring (see schematic), and correct if found mis-wired. If part is available, remove upper fresh air panel and evaporator motor; replace sensor. If no part is available, take no action and service at next PTI. XtendFRESH will continuously run the scrubber. O2 level will be controlled with the opening and closing of the fresh air vents as required. |
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Corrective Action |
The alarm is triggered off when voltage is within operating range. |
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Phase Sequence Detect Fault |
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Cause: |
Controller is unable to determine the correct phase relationship. |
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Component |
N/A |
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Troubleshooting |
Power cycle the unit. |
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Corrective Action |
Resetting the unit may correct problem, monitor the unit. |
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Component |
Wiring |
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Troubleshooting |
Check unit wiring. Confirm pressure readings during start-up; suction pressure should decrease and discharge pressure should increase. |
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Corrective Action |
Correct wiring. |
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Component |
Current Sensor |
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Troubleshooting |
Check the right-most digit in display at code Cd41. If display is 3 or 4, check compressor / sensor wiring. If display is 5, the current sensor is defective. |
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Corrective Action |
Replace current sensor if defective. |
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Compressor Current High |
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Cause: |
Compressor current draw is over the calculated maximum for 10 minutes. |
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Component |
Current Sensor |
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Troubleshooting |
Compare value at code Cd03 to actual measured current at wire T1-T2 or T3 going to the compressor contactor. If there is a difference, determine whether this is caused by current sensor or amp clamp tool. |
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Corrective Action |
Replace current sensor if defective. |
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Component |
Amperage is indeed too high. |
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Troubleshooting |
Confirm supply voltage / frequency is within specification and balanced according to Electrical Data Section 3.3. |
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Corrective Action |
Correct power supply. |
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Component |
Operating Conditions |
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Troubleshooting |
Make sure system pressures are relevant to operating conditions. |
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Corrective Action |
Check air flow of condenser. Check Refrigerant charge. See Refrigeration System Service Section 7.3. |
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Component |
Monitor Unit |
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Troubleshooting |
Alarm is display only the alarm may clear itself during operation. |
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Corrective Action |
If alarm remains active or is repetitive replace compressor at next available opportunity. See Compressor Service Section 7.9. |
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Compressor Pressure Delta Fault |
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Cause: |
Compressor has attempted to start in both directions and fails to generate sufficient pressure differential between SPT and DPT. |
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|
Component |
N/A |
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Troubleshooting |
Controller will attempt to restart every 20 minutes and deactivate the alarm if successful. |
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Corrective Action |
Resume normal operation. |
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Component |
Discharge Pressure Transducer (DPT) |
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Troubleshooting |
Confirm accurate DPT pressure readings. See Manifold Gauge Set Section 7.2. |
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Corrective Action |
Replace DPT if defective. |
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Component |
Suction Pressure Transducer (SPT) |
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Troubleshooting |
Confirm accurate SPT pressure readings. See Manifold Gauge Set Section 7.2. |
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Corrective Action |
Replace SPT if defective. |
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Component |
Monitor Unit |
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Troubleshooting |
Alarm is display only; the alarm may clear itself during operation. |
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Corrective Action |
If alarm remains active or is repetitive, replace compressor at next available opportunity. |
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Discharge Pressure High |
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Cause: |
Discharge pressure is over the maximum for 10 minutes within the last hour. |
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|
Component |
Restrictions in the refrigeration system. |
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Troubleshooting |
Ensure Liquid Line Service Valve is fully open. |
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Corrective Action |
Open Liquid Line Service Valve as needed. |
|
Component |
Filter Drier |
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Troubleshooting |
Check the filter drier. If it is iced up or very cold, it indicates that the filter drier needs replacement. |
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Corrective Action |
Replace the filter drier if needed. See Filter Drier Service Section 7.14. |
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Component |
Condenser Fan |
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Troubleshooting |
Check Condenser Fan for proper operation. |
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Corrective Action |
Correct as required. |
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Component |
Discharge Pressure Transducer (DPT) |
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Troubleshooting |
Confirm accurate DPT pressure readings. See Manifold Gauge Set Section 7.2. |
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Corrective Action |
Replace DPT if defective. |
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Component |
Non-condensables in the refrigeration system. |
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Troubleshooting |
With the unit off, allow system to stabilize to ambient temperature. Check system pressure against Pressure Temperature Chart. See Table 7–5, Table 7–6. |
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Corrective Action |
Correct as required. See Refrigerant Charge Section 7.7.1. |
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Component |
Refrigerant |
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Troubleshooting |
Check refrigerant level. |
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Corrective Action |
Correct as required. See Refrigerant Charge Section 7.7.1. |
|
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Discharge Temperature High |
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Cause: |
Discharge temperature exceeds 135°C (275°F) for 10 minutes within the last hour. |
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|
Component |
Restrictions in the refrigeration system. |
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Troubleshooting |
Ensure the Discharge Service Valve is fully open. |
|
Corrective Action |
Open the Discharge Service Valve as needed. |
|
Troubleshooting |
Check the unit for air flow restrictions. |
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Corrective Action |
Clean or remove any debris from coils. |
|
Component |
Non-condensables in the refrigeration system. |
|
Troubleshooting |
With the unit off allow system to stabilize to ambient temperature. Check system pressure against Pressure Temperature Chart. See Table 7–5, Table 7–6. |
|
Corrective Action |
Correct as required. See Refrigerant Charge Section 7.7.1. |
|
Component |
Additional Alarms such as AL16, AL24. |
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Troubleshooting |
Check compressor operation. |
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Corrective Action |
If the alarm persists, it may indicate a failing compressor, replace the compressor. See Compressor Service Section 7.9. |
|
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Control Contactor Fuse (F3) |
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Cause: |
Control power fuse (F3A or F3B) is open. |
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|
Component |
Check F3A fuse. |
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Troubleshooting |
If fuse is open, check PA, PB, CH coils for short to ground. |
|
Corrective Action |
If short is found, replace the defective coil. Replace the fuse. |
|
Component |
Check F3B fuse. |
|
Troubleshooting |
If fuse is open, check ESV coil resistance at TP7 to TP9. If short to ground, or if resistance is less than 4 ohms, coil is defective. Check CF, ES, EF, HR coils for short to ground. If short is found, coil is defective. |
|
Corrective Action |
Replace the defective coil. Replace the fuse. |
|
Component |
Check Voltage at QC1. |
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Troubleshooting |
If voltage is present, it indicates a defective microprocessor. |
|
Corrective Action |
See Controller Service Section 7.27. |
|
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Control Circuit Fuse (F1 / F2) |
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Cause: |
One of the 18 VAC controller fuses (F1 / F2) is open. See Cd08. |
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Component |
System Sensors |
|
Troubleshooting |
Check system sensors for short to ground. |
|
Corrective Action |
Replace defective sensor(s). |
|
Component |
Wiring |
|
Troubleshooting |
Check wiring for short to ground. |
|
Corrective Action |
Repair as needed. |
|
Component |
Controller |
|
Troubleshooting |
Controller may have an internal short. |
|
Corrective Action |
Replace controller. See Controller Service Section 7.27. |
|
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Evaporator IP |
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Cause: |
Evaporator motor internal protector (IP) is open. |
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|
Component |
Evaporator Motor |
|
Troubleshooting |
Shut down unit, disconnect power and check Evaporator Motor IP at plug connection pins 4 & 6. |
|
Corrective Action |
Replace defective evaporator fan motor. See Evaporator Fan Motor Service Section 7.17. |
|
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Loss of Phase B |
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Cause: |
Controller fails to detect current draw. |
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|
Component |
Incoming Power |
|
Troubleshooting |
Check incoming power source. |
|
Corrective Action |
Correct power source as required. |
|
||
Compressor IP |
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Cause: |
Compressor internal protector (IP) is open. |
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|
Component |
Compressor |
|
Troubleshooting |
Shut down unit disconnect power and check resistance of compressor windings at contactor T1-T2, T2-T3. |
|
Corrective Action |
Monitor unit, if alarm remains active or is repetitive replace the compressor at the next available opportunity. See Compressor Service Section 7.9. |
|
||
Condenser IP |
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Cause: |
Condenser fan motor internal protector (IP) is open. |
|
|
Component |
Insufficient Air Flow |
|
Troubleshooting |
Shut down unit and check condenser fan for obstructions. |
|
Corrective Action |
Remove obstructions. |
|
Component |
Condenser Fan Motor |
|
Troubleshooting |
Shut down unit, disconnect power and check Condenser Fan Motor IP at plug connection pins 4 & 6. |
|
Corrective Action |
Replace defective condenser fan motor. See Condenser Fan Motor Assembly Service Section 7.12. |
|
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All Sensors Failure: Supply / Return Probes |
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Cause: |
Sensors out of range. |
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|
Component |
All sensors detected as out of range. |
|
Troubleshooting |
Perform pre-trip P5. |
|
Corrective Action |
If P5 passes, no further action is required. |
|
Corrective Action |
If P5 fails, replace the defective sensor as determined by P5. See Temperature Sensor Service Section 7.29. |
|
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Analog to Digital Accuracy Failure |
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Cause: |
Controller AD converter faulty. |
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|
Component |
Controller |
|
Troubleshooting |
Power cycle the unit. If the alarm persists, it indicates a defective microprocessor. |
|
Corrective Action |
Replace defective microprocessor. See Controller Service Section 7.27. |
|
||
Low Suction Pressure |
||
Cause: |
Suction pressure too low for normal operation. |
|
|
Component |
N/A |
|
Troubleshooting |
Power cycle the unit. |
|
Corrective Action |
Resetting the unit may correct problem, monitor the unit. |
|
Component |
Suction Pressure Transducer (SPT) |
|
Troubleshooting |
Confirm accurate SPT pressure readings. See Manifold Gauge Set Section 7.2. |
|
Corrective Action |
Replace SPT if defective. |
|
Component |
Discharge Pressure Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings. See Manifold Gauge Set Section 7.2. |
|
Corrective Action |
Replace DPT if defective. |
|
||
Loss of Atmospheric Control (XtendFRESH) |
||
Cause: |
Triggered whenever the CO2 level is above its upper limit by 1% for 60 minutes. Or, when the O2 level is greater than 1% below its setpoint for longer than 30 minutes after the unit has been in range. The alarm is triggered off when the levels return to within the normal range. |
|
|
Setup |
Run test mode at code Cd43 for troubleshooting the below components. At the end of test mode, a sensor calibration will be attempted. Under loaded box conditions, the sensor values may post “No Cal” or “CAL FAIL”. Results from original calibration will be retained. If test mode times out, then hold the code select key for 3 seconds to exit test mode. |
|
Troubleshooting |
If components do not energize, check FX1 and FX2 for power (460 VAC). If fuse is open, check heater continuity (XHT1 to ground). Must be greater than 1 mega ohm. If less than 1, disconnect the heater at XHT1 and XHT2. Replace fuse. Unit will control on fresh air solenoids. |
|
Component |
Solenoid Air Vents. |
|
Troubleshooting |
Visually inspect to see if the Solenoid Valves are opening air vents. If vents open, troubleshoot the next component. If vents do not open, continue with troubleshooting below. Check FX4 fuse for power (~20 volts dc). If fuse is open, check wiring and or replace solenoid if part is available. If no part is available, open manual fresh air vent. |
|
Component |
XtendFRESH Fan(s) / XtendFRESH Scrubber Motor |
|
Troubleshooting |
Visually inspect to see if the XtendFRESH Fan(s) are running (air blowing on left, intake on right), check current draw of motor at the XST1 (~40 to 200 milliamps / contactor load side). Troubleshoot the non-operating component. If both are running, proceed to next component. Verify XS contactor is pulling in. If not, check FX6 fuse for power (24 VAC). If not, check power at controller KB4. Check FX3 fuse for power (~20 vdc). If no power, replace fuse. If fuse opens a second time, take no further action. O2 level will be controlled with the opening and closing of the fresh air vents. If part is available, replace either fan or scrubber motor. Fan is replaceable from the front on a loaded unit; Scrubber motor is not. If no part is available or accessible, take no action and service at next PTI. O2 level will be controlled with the opening and closing of the fresh air vents. |
|
Component |
Heater |
|
Troubleshooting |
Verify XH contactor is pulling in. If not, check FX6 for power (24 VAC). If open ohm contactors XHA1 and XSA1 to ground. Replace (12 Amp) contactor. If contactor is pulling, power unit off and check heater resistance from XH1 to XH2 (450 to 500 ohms). If heater is outside of the range, disconnect heater at XHT1 and XHT2 and replace at next PTI. Unit will control on fresh air solenoids. |
|
||
Air Vent Position Sensor (VPS) |
||
Cause: |
Vent Position Sensor (VPS) Sensor out of range. |
|
|
Component |
Vent Position Sensor (VPS) |
|
Troubleshooting |
Make sure VPS is secure. |
|
Corrective Action |
Manually tighten panel. |
|
Troubleshooting |
If the alarm persists, replace the VPS or the assembly. |
|
Corrective Action |
Replace VPS. |
|
||
EEPROM Failure |
||
Cause: |
Controller Memory Failure |
|
|
Component |
Controller |
|
Troubleshooting |
Pressing the ENTER key when “CLEAr” is displayed will result in an attempt to clear the alarm. |
|
Corrective Action |
If action is successful (all alarms are inactive), alarm 51 will be reset. |
|
Troubleshooting |
Power cycle the unit. If the alarm persists, it indicates defective controller memory. |
|
Corrective Action |
Replace defective controller. See Controller Service Section 7.27. |
|
||
EEPROM Alarm List Full |
||
Cause: |
Alarm list queue is full |
|
|
Component |
Active Alarms |
|
Troubleshooting |
Repair any alarms in the queue that are active. Indicated by “AA”. |
|
Corrective Action |
Clear alarms. See Controller Alarms Section 4.4. |
|
||
Battery Pack Failure |
||
Cause: |
Battery voltage low |
|
|
Component |
Battery |
|
Troubleshooting |
If this alarm occurs on start up, allow a unit fitted with rechargeable batteries to operate for up to 24 hours to charge rechargeable batteries sufficiently. Once fully charged, the alarm will deactivate. |
|
Corrective Action |
To clear the alarm press ENTER and ALT simultaneously at the startup of code Cd19 (Battery Check). If alarm persists, replace the battery pack. See Section 7.27.4 Battery Replacement. |
|
||
Primary Supply Sensor (STS) |
||
Cause: |
Invalid Supply Temperature Sensor (STS) reading. |
|
|
Component |
Supply Temperature Sensor (STS) |
|
Troubleshooting |
Perform pre-trip P5. |
|
Corrective Action |
If P5 passes, no further action is required. If P5 fails, replace the defective sensor as determined by P5. See Temperature Sensor Service Section 7.29. |
|
||
Primary Return Sensor (RTS) |
||
Cause: |
Invalid Return Temperature Sensor (RTS) reading. |
|
|
Component |
Return Temperature Sensor (RTS) |
|
Troubleshooting |
Perform pre-trip P5. |
|
Corrective Action |
If P5 passes, no further action is required. If P5 fails, replace the defective sensor as determined by P5. See Temperature Sensor Service Section 7.29. |
|
||
Ambient Sensor (AMBS) |
||
Cause: |
Invalid Ambient Temperature Sensor (AMBS) reading. |
|
|
Component |
Ambient Temperature Sensor (AMBS) |
|
Troubleshooting |
Test the AMBS. See Sensor Checkout Procedure Section 7.29.2. |
|
Corrective Action |
Replace AMBS if defective. See Temperature Sensor Service Section 7.29. |
|
||
Compressor High Pressure Safety (HPS) |
||
Cause: |
High pressure safety switch remains open for at least one minute. |
|
|
Component |
High Pressure Switch (HPS) |
|
Troubleshooting |
Test the HPS. See Checking High Pressure Switch, Section 7.10.1. |
|
Corrective Action |
Replace HPS if defective. See Sensor Replacement, Section 7.29. |
|
Component |
Refrigeration System |
|
Troubleshooting |
Check unit for air flow restrictions. |
|
Corrective Action |
Clean or remove any debris from coils. |
|
||
Heater Termination Thermostat (HTT) |
||
Cause: |
Heat Termination Thermostat (HTT) is open. |
|
|
Component |
Heat Termination Thermostat (HTT) |
|
Troubleshooting |
Check for 24 volts at test point TP10. If no voltage at TP10 after unit has reached setpoint, HTT is open. |
|
Corrective Action |
Replace HTT if defective. See Sensor Replacement Section 7.29. |
|
||
Defrost Temperature Sensor (DTS) |
||
Cause: |
Failure of the Defrost Temperature Sensor (DTS) to open. |
|
|
Component |
Defrost Temperature Sensor (DTS) |
|
Troubleshooting |
Test the DTS; see Sensor Checkout Procedure Section 7.29.2. |
|
Corrective Action |
Replace the DTS if defective. See Sensor Replacement Section 7.29. |
|
||
Heater Current Draw Fault |
||
Cause: |
Improper current draw during heat or defrost mode. |
|
|
Component |
Heater(s) |
|
Troubleshooting |
While in heat or defrost mode, check for proper current draw at heater contactors. See Electrical Data Section 3.3. |
|
Corrective Action |
Replace heater(s) if defective. See Evaporator Heater Removal and Replacement Section 7.16. |
|
Component |
Contactor |
|
Troubleshooting |
Check voltage at heater contactor on the heater side. |
|
Corrective Action |
If no voltage present, replace heater contactor if defective. |
|
||
O2 Out of Range |
||
Cause: |
This is a notification alarm and does not pose a risk to fresh produce. It is triggered when there is an indication that O2 level is rising after reaching its setpoint (+ 1%). If O2 level exceeds 4% above setpoint, the alarm is activated. The alarm does not activate if the unit was pre-tripped or trip started between last reaching its O2 setpoint and exceeding the plus 4%, or if power has been turned off for eight hours. The alarm is deactivated if O2 drops below setpoint (+ 1%) or if a Pre-Trip or Trip Start is performed. |
|
|
Component |
Scrubber Failure |
|
Troubleshooting |
See the troubleshooting of the Scrubber Motor in the AL29 alarm. |
|
Component |
XtendFRESH Solenoid Valves |
|
Troubleshooting |
See the troubleshooting of the Solenoid Air Vent in the AL29 alarm. |
|
Component |
Container Air Tightness |
|
Troubleshooting |
Seal container where possible (access panels, rear doors, mounting hardware, etc). |
|
||
Current Limit |
||
Cause: |
Unit operating above current limit. |
|
|
Component |
Refrigeration System |
|
Troubleshooting |
Check unit for air flow restrictions. |
|
Corrective Action |
Clean or remove any debris from coils. |
|
Troubleshooting |
Check unit for proper operation. |
|
Corrective Action |
Repair as needed. |
|
Component |
Power supply |
|
Troubleshooting |
Confirm supply voltage/frequency is within specification and balanced according to Electrical Data Section 3.3. |
|
Corrective Action |
Correct power supply. |
|
Component |
Current limit set too low |
|
Troubleshooting |
Check current limit setting Code Cd32. |
|
Corrective Action |
The current limit can be raised (maximum of 23 amps) using Cd32. |
|
||
Discharge Temperature Sensor (CPDS) |
||
Cause: |
Compressor Discharge Temperature Sensor (CPDS) out of range. |
|
|
Component |
Compressor Discharge Temperature Sensor (CPDS). |
|
Troubleshooting |
Test the CPDS. See Sensor Checkout Procedure, Section 7.29.2. |
|
Corrective Action |
Replace the CPDS if defective. See Sensor Replacement Section 7.29. |
|
||
Discharge Pressure Transducer (DPT) |
||
Cause: |
Compressor Discharge Pressure Transducer (DPT) is out of range. |
|
|
Component |
Compressor Discharge Pressure Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings. See Manifold Gauge Set Section 7.2. |
|
Corrective Action |
Replace DPT if defective. |
|
||
Suction Pressure Transducer (SPT), Evaporator Pressure Transducer (EPT) |
||
Cause: |
Suction Pressure Transducer (SPT) out of range. |
|
|
Component |
Suction Pressure Transducer (SPT) |
|
Troubleshooting |
Confirm accurate EPT and SPT pressure readings. See Manifold Gauge Set Section 7.2. Performing a pre-trip 5-9 test will also check the transducers. |
|
Corrective Action |
Replace EPT/SPT if defective. |
|
Troubleshooting |
Monitor |
|
Corrective Action |
If the alarm persists, it may indicate a failing compressor. See Compressor Service Section 7.9. |
|
||
Humidity Sensor |
||
Cause: |
Humidity Sensor (HS) reading out of range. |
|
|
Component |
Humidity Sensor (HS) |
|
Troubleshooting |
Make sure the HS is properly connected in the socket. Make sure the HS wires have not been damaged. See Section 7.20 to test operation of Humidity Sensor. |
|
Corrective Action |
Monitor, replace HS if alarm persists. |
|
||
Evaporator Temp Sensor (ETS1) |
||
Cause: |
Evaporator Temperature Sensor (ETS1) out of range. |
|
|
Component |
Evaporator Temperature Sensor (ETS1) |
|
Troubleshooting |
Test the ETS1. See Sensor Checkout Procedure Section 7.29.2. |
|
Corrective Action |
Replace Evaporator Temperature Sensor (ETS1) if defective. |
|
||
Secondary Supply Sensor (SRS) |
||
Cause: |
Secondary Supply Sensor (SRS) is out of range. |
|
|
Component |
Secondary Supply Sensor (SRS) |
|
Troubleshooting |
Perform pre-trip P5. |
|
Corrective Action |
If P5 passes, no further action is required. |
|
Corrective Action |
If P5 fails, replace the defective sensor as determined by P5. See Temperature Sensor Service Section 7.29. |
|
||
Secondary Return Sensor (RRS) |
||
Cause: |
Secondary Return Sensor (RRS) is out of range. |
|
|
Component |
Secondary Return Sensor (RRS) |
|
Troubleshooting |
Perform pre-trip P5. |
|
Corrective Action |
If P5 passes, no further action is required. |
|
Corrective Action |
If P5 fails, replace the defective sensor as determined by P5. See Temperature Sensor Service Section 7.29. |
|
||
Control Temp Out of Range |
||
Cause: |
After the unit goes in-range for 30 minutes then out of range for a continuous 120 minutes. |
|
|
Component |
Refrigeration System |
|
Troubleshooting |
Ensure unit is operating correctly. |
|
Corrective Action |
Power cycle unit. Control Temperature is in range. Any pre-trip mode resets the timers. |
|
||
Scrubber Rotational Feature (option) |
||
Cause: |
Feedback from the Scrubber Motor to the controller is not sensed when the motor is turning. |
|
|
Component |
Scrubber Fuse |
|
Troubleshooting |
Check to see if Scrubber Fuse is blown. Replace Fuse if necessary. |
|
Component |
Scrubber Motor |
|
Troubleshooting |
Run Test Mode and verify scrubber bed is turning. If back panel cannot be removed to check, verify the scrubber amperage consumption, read at XS contactor wire XSL1. If between 40 and 200mA, motor is rotating properly. If no current detected, check and replace FX3. If current spiking to 350mA for 2 seconds then dropping to 90mA, the scrubber motor is located. If scrubber motor is locked, further inspection of the scrubber bed is required. Unit will control CO2 with the fresh air solenoid when this alarm occurs if scrubber inaccessible. If Scrubber Motor not operating, follow the troubleshooting flowchart in XtendFresh manual and take appropriate action. |
|
Component |
Ground Interface Module (GIM) |
|
Troubleshooting |
Once it has been verified that the scrubber motor is rotating, check the wiring connections to the GIM module. If all wires secured properly, re-place the GIM module if one is available. If not, the unit will control CO2 using the fresh air solenoids. |
If the controller is configured for four probes without a DataCORDER, the DataCORDER alarms AL70 and AL71 will be processed as Controller alarms AL70 and AL71. See Table 4–10. |
||
|
|
|
Entr |
Enter Set point (Press Arrow & Enter) |
|
Cause: |
The controller is prompting the operator to enter a setpoint. |
|
|
||
LO |
Low Main Voltage (Function Codes Cd27-38 disabled and NO alarm stored.) |
|
Cause: |
This message will be alternately displayed with the setpoint whenever the supply voltage is less than 75% of its proper value. |
|
Pre-Trip Diagnostics is an independent controller function that suspends normal refrigeration controller activities and provides preprogrammed test routines. The test routine can be run in Auto Mode, which automatically performs a pre programmed sequence of tests, or Manual Mode, which allows the operator to select and run any of the individual tests.
Pre-trip inspection should not be performed with critical temperature cargoes in the container.
When the pre-trip key is pressed economy, dehumidification and Bulb Mode will be deactivated. At the completion of the pre-trip test, economy, dehumidification and Bulb Mode must be reactivated.
A pre-trip test may be initiated by use of the keypad or via communication, but when initiated by communication the controller will execute the entire battery of tests (auto mode).
At the end of a pre-trip test, the message “P,” “rSLts” (pretest results) will be displayed. Pressing ENTER will allow the user to see the results for each of the sub-tests. The results will be displayed as “PASS” or “FAIL” for each test run to completion.
A detailed description of the pre-trip tests and test codes is described in Table 4–6. Detailed operating instructions are described in Section 5.8.
4.5.1Controller Pre-Trip Test Codes
The pre-trip selection menu provides the user the option of selecting one of two automatic tests (short sequence or long sequence). These tests will automatically perform a series of individual pre-trip tests. The user may also scroll down to select any of the individual tests.
The short pre-trip test sequence will appear as either “AUTO” or “AUTO1” in the display. This runs tests P0 through P6, which includes most functions, sensors and system components.
The long pre-trip test sequence is selected by either “AUTO2” or “AUTO3” in the display. “AUTO2” runs tests P0 through P10 and “AUTO3” runs tests P0 through P8. The long test sequence includes all of the short sequence tests and also tests for the high pressure switch, heater performance and cooling performance.
Code |
Description |
|
Pre-Trip Initiated: Configuration Display, Indicator Lamps, LEDs, and Displays |
||
|
Container identifier code, Cd18 Software Revision Number, Cd20 Container Unit Model Number, & configuration database identifier CFMMYYDD are displayed in sequence. Next the unit will indicate the presence or non-presence of an RMU according to whether any RMU inquiry messages have been received since the unit was booted. Units equipped with Autoslide Enabled (Cnf44) will cause the vent to seek to its closed position, followed by two sequences of opening to 100% and returning to the closed position. No other autoslide mode of operation will be available until the two cycles of opening and closing have completed. Since the system cannot recognize lights and display failures, there are no test codes or results associated with this phase of pre-trip. To know if the test passes the operator must observe that the LCD display elements and the indicator lights behave as described below. |
|
Heaters Current Draw: For P1 tests, the heater is turned on, then off. Current draw must fall within specified range. No other system components will change state during this test. |
||
Heaters Turned On |
||
|
Heater starts in the off condition, current draw is measured, and then the heater is turned on. After 15 seconds, the current draw is measured again. The change in current draw is then recorded. Test passes if the change in current draw test is in the range specified. |
|
Heaters Turned Off |
||
|
Heater is then turned off. After 10 seconds, the current draw is measured. The change in current draw is then recorded. Test passes if change in current draw test is in the range specified. |
|
Condenser Fan Current Draw: For P2 tests, the condenser fan is turned on, then off. Current draw must fall within specified range. No other system components will change state during this test. If the Water Pressure Switch is open this test will be skipped. |
||
Condenser Fan On |
||
|
Condenser fan starts in the off condition and current draw is measured. Condenser fan is then turned on and after 15 seconds the current draw is measured again. The change in current draw is recorded. Test passes if change in current draw test is in the specified range. |
|
Condenser Fan Off |
||
|
Condenser fan is on and current draw is measured. Condenser fan is then turned off and after 10 seconds the current draw is measured. The change in current draw is recorded. Test passes if change in current draw test is in the specified range. |
|
Low Speed Evaporator Fan Current Draw: For P3 tests, the system must be equipped with a low speed evaporator fan, as determined by CnF02, the Evaporator Fan Speed Select configuration variable. Low speed evaporator fan is turned on, then off. Current draw must fall within specified range. No other system components will change state during this test. If a unit is configured for single evaporator fan operation and either AL11 or AL12 is active at the start of either test, then the test will fail immediately. If AL11 or AL12 become active during the test, then the test will fail upon conclusion of the test. |
||
Low Speed Evaporator Fan Motors On |
||
|
Low speed evaporator fans start in the off condition and current draw is measured. Low speed evaporator fans are then turned on and after 60 seconds the current draw is measured again. The change in current draw is recorded. Test passes if change in current draw test is in the specified range. |
|
Low Speed Evaporator Fan Motors Off |
||
|
Low speed evaporators are on and current draw is measured. Low speed evaporator fans are then turned off and after 10 seconds the current draw is measured again. The change in current draw is recorded. Test passes if change in current draw test is in the specified range. |
|
High Speed Evaporator Fans Current Draw: For P4 tests, high speed evaporator fans are turned on, then off. Current draw must fall within specified range and measured current changes must exceed specified ratios. No other system components will change state during this test. If a unit is configured for single evaporator fan operation and either AL11 or AL12 is active at the start of either test, then the test will fail immediately. If AL11 or AL12 become active during the test, then the test will fail upon conclusion of the test. |
||
High Speed Evaporator Fan Motors On |
||
|
High speed evaporator fans start in the off condition and current draw is measured. High speed evaporator fans are then turned on and after 60 seconds the current draw is measured again. The change in current draw is recorded. Test passes if change in current draw in the specified range AND measured current changes exceed specified ratios. If the three phase motors are configured IN, the change ratio test is skipped. |
|
High Speed Evaporator Fan Motors Off |
||
|
High speed evaporator fans are on and current draw is measured. High speed evaporator fans are then turned off and after 10 seconds the current draw is measured again. The change in current draw is then recorded. Test passes if change in current draw test is in the specified range. |
|
Air Stream Temperature Sensor Tests: The P5 tests are to check the validity of the Air Stream Temperature Sensors. |
||
Supply / Return Probe Test |
||
|
The High Speed Evaporator Fan is turned on and run for eight minutes, with all other outputs de-energized. A temperature comparison is made between the return and supply probes. Test passes if temperature comparison falls within the specified range. NOTE If this test fails, “P5-0” and “FAIL” will be displayed. If both Probe tests (this test and the PRIMARY/SECONDARY) pass, display will read “P5” “PASS.” |
|
Supply Probe Test |
||
|
This test is for units equipped with secondary supply probe only. The temperature difference between primary supply probe and secondary supply probe is compared. Test passes if temperature comparison falls within the specified range. NOTE If this test fails, “P5-1” and “FAIL” will be displayed. If both Probe tests (this and the SUPPLY/RETURN TEST) pass, because of the multiple tests, the display will read “P5” “PASS.” |
|
Return Probe Test |
||
|
This test is for units equipped with secondary return probe only. The temperature difference between return temperature sensor (RTS) and return temperature sensor (RRS) probe is compared. Test passes if temperature comparison falls within the specified range. NOTES 1.If this test fails, “P5-2” and “FAIL” will be displayed. If both Probe tests (this test and the SUPPLY/RETURN) pass, because of the multiple tests, the display will read “P 5,” “PASS.” 2.The results of pre-trip tests 5-0, 5-1 and 5-2 will be used to activate or clear control probe alarms. |
|
Evaporator Fan Direction Test |
||
|
With evaporator fan running on high speed, measure the temperature difference between the primary supply and primary return probes. Turn the heaters on for 60 seconds then measure the temperature difference between the primary supply and primary return probes for up to 120 additional seconds. This is a Pass/Fail test. The test passes if differential of STS is 0.25°C higher than RTS. Test P5-0 must pass before this test is run. |
|
Primary vs. Secondary Evaporator Temperature Sensor Test |
||
|
This is a Pass / Fail test of the primary Evaporator Temperature Sensor (ETS1) and secondary Evaporator Temperature Sensor (ETS2). Test passes if secondary Evaporator Temperature Sensor (ETS2) is within +/- 0.5°C of the primary Evaporator Temperature Sensor (ETS1). |
|
Future Expansion |
||
|
This is no longer active and will be displayed as “-----” at this time. |
|
Primary vs. Secondary Evaporator Pressure Transducer Test |
||
|
This is a Pass / Fail test of the primary Evaporator Pressure Transducer and secondary Evaporator Pressure Transducer. Test passes if secondary Evaporator pressure is within +/- 1.5 psi of the primary Evaporator pressure. |
|
Humidity Sensor Controller Configuration Verification Test |
||
|
This is a Pass / Fail / Skip test of the humidity sensor configuration. Test passes if the controller configuration has humidity sensor in. Test fails if the controller configuration has humidity sensor out and Vout is greater than 0.20 Volts for the humidity sensor. Test is skipped if the controller configuration has the humidity sensor out and Vout is less than 0.20 Volts. Test P5-9 must pass before this test is run. |
|
Humidity Sensor Installation Verification Test |
||
|
This is a Pass / Fail test of humidity sensor installation (sensor is present). Test passes if Vout is greater than 0.20 Volts for the humidity sensor. Test fails if Vout is less than 0.20 Volts for the humidity sensor. Test P5-10 must pass before this test is run. |
|
Humidity Sensor Range Check Test |
||
|
This is a Pass / Fail test of the Humidity Sensor Range. Test passes if Vout for the humidity sensor is between 0.33 Volts and 4 Volts. Test fails if Vout is outside of this range. Test P5-11 must pass before this test is run. |
|
Refrigerant Probes, Compressor and Refrigerant Valves: The P6 tests are for Pass / Fail testing performed for the compressor, EEV, DUV, LIV (if equipped), ESV, and the refrigerant pressure and temperature sensors. |
||
Discharge Thermistor Test |
||
|
If Alarm 64 is active the test fails. Otherwise, the test passes. Alarm 64 monitors the range of the Discharge Temperature Sensor (CPDS). |
|
Evaporator Temperature Sensor (Suction) Test |
||
|
If the Evaporator Temperature Sensor (ETS1/ETS2) is invalid, the test fails. Otherwise the test passes. |
|
Discharge Pressure Transducer Test |
||
|
If Alarm 65 is active any time during the first 45 second period, the test fails. Otherwise, the test passes. Alarm 65 monitors the range of the Discharge Pressure Transducer (DPT). |
|
Suction Pressure Transducer Test |
||
|
If Alarm 66 is active the test fails. Otherwise the test passes. Alarm 66 monitors the range of the Suction Pressure Transducer (SPT). |
|
Compressor Current Draw Test |
||
|
Compressor current is tested before and 10 seconds after start up. If current does not increase, the test fails. P6-7 is run at the end of P6-4. If this test fails, P6-6 is skipped. |
|
Compressor Leak Test |
||
|
Pre-trip P6-5 ensures that the compressor holds pressure. After compressor pump up and pump down, the compressor is turned off for 62 seconds. When suction side pressure holds (less than 8 psi rise) for 10 seconds, P6-5 passes, otherwise the Compressor Leak Test fails. See the July 2017 issue of TechLine for a procedure to assist the technician in troubleshooting a P6-5 occurrence. |
|
Tests P6-6 through P6-10 are conducted by changing status of each valve and comparing suction pressure change and/or compressor current change with predetermined values. Tests will cause compressor and condenser fans to cycle on and off as needed to generate the pressure required for individual pre-trip sub tests. The compressor will start in order to build discharge pressure, followed by compressor pump down sequence. At the conclusion of compressor pump down sequence, the compressor will shut down and the valve test will start. |
||
Economizer Valve Test |
||
|
Passes if suction pressure increases a minimum of 4 psia when the valve opens for 15 seconds. |
|
Digital Unloader Valve Test |
||
|
Passes if pressure and current changes are within 3 seconds of DUV switch signal and either the pressure change or the current draw change is above 5 psi or above 1.5A, respectively. |
|
Liquid Injection Valve Test |
||
|
(If equipped) Test passes if change of suction pressure is greater than 4 psia when the valve opens for 10 seconds. Otherwise, it fails. |
|
Electronic Expansion Valve Test |
||
|
The test records the suction pressure during the open valve position and passes if the suction pressure increase is above 3 psi when the valve opens for 10 seconds. |
|
NOTE P7-0 & P8 are included with “Auto 2 & Auto 3” only. P9-0 through P10 are included with “Auto2” only. |
||
High Pressure Tests: For the P7 tests, the unit is run at full capacity without condenser fan running to make sure that the HPS opens and closes properly. |
||
High Pressure Switch (HPS) Opening Test |
||
|
Test is skipped if sensed ambient temperature is less than 7.2°C (45°F), return air temperature is less than -17.8°C (0°F), or the water pressure switch is open. With the unit running, the condenser fan is turned off and a 900 second (15 minute) timer is started. The right display shows Discharge Pressure if the sensor is configured and valid, else Discharge Temperature. The unit needs to disable Discharge Pressure limit and enable Current Limit checks. The test fails immediately if: •Ambient Temperature Sensor invalid •Composite Return Temperature Sensor invalid •HPS is open The test fails if: •HPS fails to open before 900 seconds total test time. •Evaporator or Compressor IP Alarm. •Calculated Dome Temperature exceeds 137.78°C (280°F). •Discharge pressure exceeds 370 psig. •Compressor Current exceeds limits The test passes if HPS opens within the 15 minute time limit. |
|
High Pressure Switch (HPS) Closing Test |
||
|
If return temperature greater than -2.4°C, set setpoint to -5.0°C, else set setpoint to -30°C. Restart unit according to normal startup logic. Run unit normally for 120 seconds. The test passes if the high pressure switch closes within 75 seconds after end of Test 7-0, else the test fails. Test P7-0 must pass for this test to execute. |
|
Perishable Mode Tests: In order for P8 tests to execute, Pre-trip tests P7-0 and P7-1 must have passed or have been skipped. |
||
Perishable Mode Test |
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If the control temperature is below 15.6°C, the setpoint is changed to 15.6°C, and a 180 Minute timer is started. The control will then be placed in the equivalent of normal heating. If the control temperature is above 15.6°C. at the start of the test, then the test proceeds immediately to test 8-1. While in test 8-0 the right display will show the value of the control temperature. The test fails if the 180 Minute timer expires before the control temperature reaches setpoint - 0.3°C. If the test fails, it will not auto-repeat. There is no pass display for this test. Once the control temperature reaches setpoint, the test proceeds to test 8-1. |
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Perishable Mode Pull Down Test / CO2 Sensor Calibration |
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Control temperature must be at least 15.6°C (60°F). The setpoint is changed to 0°C (32°F), and a 180-minute timer is started. The left display will read “P8-1,” the right display will show the supply air temperature. The unit will then start to pull down the temperature to the 0°C setpoint. The test passes if the container temperature reaches setpoint before the 180-minute timer expires. On units where the CO2 Sensor Status indicates that a CO2 sensor is present, calibration of the CO2 sensor will be attempted during P8-1. Once P8-1 begins, calibration will be attempted when the supply temperature goes below 5°C. If the CO2 sensor voltage reads within the 0.95 <>1.15Vdc range before the end of P8-1, the sensor will be calibrated by holding the CO2 zero line low for 4 seconds. Once calibration is performed, the sensor voltage will be verified to make sure it is in the 0.95 to 1.05 Vdc range. If the voltage is not within this range, CO2 sensor calibration fails. |
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Perishable Mode Maintain Temperature Test |
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Test P8-1 must pass for P8-2 to execute. A fifteen minute timer is started, and the system will attempt to minimize control temperature error (supply temperature minus setpoint) until the timer expires. The control temperature will be sampled each minute starting at the beginning of P8-2. During P8-2, the left display will read “P8-2,” and the right display will show the supply air temperature. When the test is completed, the average control temperature error will be compared to the pass/fail criteria. Test passes if the average temperature error is within +/- 1.0°C. Test fails if the average temperature error is greater than +/- 1.0°C, or if the DataCORDER supply temperature probe is invalid. If the test fails, the control probe temperature will be recorded as -50.0°C. |
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DTT Close and Open Test: For the P9 tests, the DTT in this control is not a physical device, with actual metallic contacts, it is a software function that acts similar to a thermostat. Using various temperature inputs, the DTT function determines whether a thermostat mounted on the Evaporator Coil would have OPEN or CLOSED contacts. Primarily, the DTT function operates based on the temperature reading from the Defrost Termination Sensor. |
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DTT Closed and Open Test |
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During P9-0 the defrost temperature sensor (DTS) reading will be displayed on the left display. The right display will show the supply air temperature. The unit will run FULL COOL for 30 minutes maximum until the DTT is considered closed. This step may not have to be executed. Once the DTT is considered closed, the unit simulates defrost by running the heaters for up to two hours, or until the DTT is considered open. Test fails if The DTT is not considered closed after the 30 minutes of full cooling. Or, if the HTT opens when DTT is considered closed or if return air temperature rises above 48°C (120°F). Test passes if the DTT is considered open within the 2 hour heat cycle time limit. |
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Frozen Mode Tests: |
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Frozen Mode Heat Test |
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If the container temperature is below 7.2°C, the setpoint is changed to 7.2°C, and a 180 Minute timer is started. The control will then be placed in the equivalent of normal heating. If the container temperature is above 7.2°C. at the start of the test, then the test proceeds immediately to test 10-1. During this test, the control temperature will be shown on the right display. The test fails if the 180 Minute timer expires before the control temperature reaches setpoint - 0.3°C. If the test fails, it will not auto-repeat. There is no pass display for this test. Once the control temperature reaches setpoint, the test proceeds to test 10-1. |
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Frozen Mode Pulldown Test |
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Control temperature must be at least 7.2°C (45°F) The setpoint is changed to -17.8°C. The system will then attempt to pull down the control temperature to setpoint using normal frozen mode cooling. During this test, the control temperature will be shown on the right display. The test passes if the control temperature reaches setpoint minus 0.3°C before the 180 minute timer expires. Otherwise, the test fails. Upon failure and when initiated by an automatic pre-trip sequence, P10-1 will auto-repeat once by starting P10-0 over again. |
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Frozen Mode Maintain Temperature Test |
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Test P10-1 must pass for this test to execute. Same as for test 8-2 except control temperature is the return probe temperature. The average error must be +/-1.6°C. If the DataCORDER supply temperature probe is invalid, the test fails and the control probe temperature will be recorded as -50°C. Upon failure and when initiated by an automatic pre-trip sequence, P10-2 will auto-repeat by starting P10-0 over again. |
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Carrier Transicold “DataCORDER” software is integrated into the controller and serves to eliminate the temperature recorder and paper chart. DataCORDER functions may be accessed by keypad selections and viewed on the display module. The unit is also fitted with interrogation connections which may be used with the Carrier Transicold DataReader to download data. A personal computer with Carrier Transicold DataLINE software installed may also be used to download data and configure settings.
The DataCORDER consists of:
•Configuration Software
•Operational Software
•Data Storage Memory
•Real Time Clock (with internal battery backup)
•Six Thermistor Inputs
•Interrogation Connections
•Power Supply (battery pack)
The DataCORDER performs the following functions:
a.Logs data at 15, 30, 60 or 120 minute intervals and stores two years of data (based on one hour interval).
b.Records and displays alarms on the display module.
c.Records results of pre-trip testing.
d.Records DataCORDER and temperature control software generated data and events as follows:
•Container ID Change
•Software Upgrades
•Alarm Activity
•Battery Low (battery pack)
•Data Retrieval
•Defrost Start and End
•Dehumidification Start and End
•Power Loss (with and without battery pack)
•Power Up (with and without battery pack)
•Remote Probe Temperatures in the Container (USDA Cold treatment and Cargo probe recording)
•Return Air Temperature
•Setpoint Change
•Supply Air Temperature
•Real Time Clock Battery (Internal) Replacement
•Real Time Clock Modification
•Trip Start
•ISO Trip Header (When entered via Interrogation program)
•Economy Mode Start and End
•“Auto 1 / Auto 2 / Auto 3” Pre-Trip Start and End
•Bulb Mode Start
•Bulb Mode Changes
•Bulb Mode End
•USDA Trip Comment
•Humidification Start and End
•USDA Probe Calibration
•Fresh Air Vent Position
4.6.2DataCORDER Configuration Software
The configuration software controls the recording and alarm functions of the DataCORDER. Reprogramming to the factory-installed configuration is achieved via a configuration card. Changes to the unit DataCORDER configuration may be made using the DataLINE interrogation software.
A list of the configuration variables is provided in Table 4–7. Descriptions of DataCORDER operation for each variable setting are provided in the following paragraphs.
Two modes of operation may be configured: Standard Mode and Generic Mode.
Standard Mode
In the Standard Mode, the user may configure the DataCORDER to record data using one of several standard configurations. The standard sensor configurations are described in Table 4–8.
The inputs of the six thermistors (Supply, Return, USDA #1, #2, #3 and Cargo probe) and the Humidity Sensor input will be generated by the DataCORDER.
The DataCORDER software uses the Supply Recorder Sensor (SRS) and Return Recorder Sensor (RRS). While the temperature control software uses the Supply Temperature Sensor (STS) and Return Temperature Sensor (RTS).
Generic Mode
The Generic Recording Mode allows user selection of the network data points to be recorded. The user may select up to a total of eight data points for recording. Changing the configuration to generic and selecting which data points to record may be done using the Carrier Transicold Data Retrieval Program. A list of the data points available for recording follows.
1.Control mode
2.Control temperature
3.Frequency
4.Humidity
5.Phase A, B, C current
6.Main voltage
7.Electronic Expansion Valve (EEV) percentage
8.Discrete outputs (Bit mapped - require special handling if used)
9.Discrete inputs (Bit mapped - require special handling if used)
10.Ambient Temperature Sensor (AMBS)
11.Evaporator Temperature Sensor (ETS)
12.Compressor Discharge Sensor (CPDS)
13.Return Temperature Sensor (RTS)
14.Supply Temperature Sensor (STS)
15.Defrost Temperature Sensor (DTS)
16.Discharge Pressure Transducer (DPT)
17.Suction Pressure Transducer (SPT)
18.Vent Position Sensor (VPS)
The user may select four different time intervals between data recordings. Data is logged at exact intervals in accordance with the real time clock. The clock is factory set at Greenwich Mean Time (GMT).
Thermistor Format (dCF04)
The user may configure the format in which the thermistor readings are recorded. The short resolution is a 1 byte format and the long resolution is a 2 byte format. The short requires less memory and records temperature with variable resolutions depending on temperature range. The long records temperature in 0.01°C (0.02°F) steps for the entire range.
Three types of data sampling are available: average, snapshot and USDA. When configured to average, the average of readings taken every minute over the recording period is recorded. When configured to snapshot, the sensor reading at the log interval time is recorded. When USDA is configured, supply and return temperature readings are averaged and the three USDA probe readings are snapshot.
Alarm Configuration (dCF07 - dCF10)
USDA and cargo probe alarms may be configured to OFF, ON or AUTO.
If a probe alarm is configured to OFF, the alarm for this probe is always disabled.
If a probe alarm is configured to ON, the associated alarm is always enabled.
If the probes are configured to AUTO, they act as a group. This function is designed to assist users who keep the DataCORDER configured for USDA recording, but do not install the probes for every trip. If all the probes are disconnected, no alarms are activated. As soon as one of the probes is installed, all of the alarms are enabled and the remaining probes that are not installed will give active alarm indications.
4.6.3DataCORDER Operational Software
The DataCORDER operational software reads and interprets inputs for use by the configuration software. The inputs are labeled function codes. Controller functions (see Table 4–9) which the operator may access to examine the current input data or stored data.
To access DataCORDER function codes, do the following:
1.Press the ALT. MODE and CODE SELECT keys.
2.Press an Arrow key until the left window displays the desired code number. The right window will display the value of this item for five seconds before returning to the normal display mode.
3.If a longer display time is desired, press the ENTER key to extend the display time to 30 seconds.
4.If a function is not applicable for the unit, dashes “-----” are shown on the display for that code.
The DataCORDER may be powered up in any one of four ways:
1.Normal AC power: The DataCORDER is powered up when the unit is turned on via the Stop-Start switch.
2.Controller DC battery pack power: If a battery pack is installed, the DataCORDER will power up for communication when an interrogation cable is plugged into an interrogation receptacle.
3.External DC battery pack power: A 12 volt battery pack may also be plugged into the back of the interrogation cable, which is then plugged into an interrogation port. No controller battery pack is required with this method.
4.Real Time Clock demand: If the DataCORDER is equipped with a charged battery pack and AC power is not present, the DataCORDER will power up when the real time clock indicates that a data recording should take place. When the DataCORDER is finished recording, it will power down.
During DataCORDER power-up, while using battery-pack power, the controller will perform a hardware voltage check on the battery. If the hardware check passes, the controller will energize and perform a software battery voltage check before DataCORDER logging. If either test fails, the real time clock battery power-up will be disabled until the next AC power cycle. Further DataCORDER temperature logging will be prohibited until that time.
An alarm will be generated when the battery voltage transitions from good to bad indicating that the battery pack needs recharging. If the alarm condition persists for more than 24 hours on continuous AC power, it indicates that the battery pack needs replacement.
The alarm display is an independent DataCORDER function. If an operating parameter is outside of the expected range or a component does not return the correct values to the DataCORDER, an alarm is generated. The DataCORDER contains a buffer of up to eight alarms. A listing of the DataCORDER alarms is described in Table 4–10. See Section for configuration information.
Displaying Alarm Codes:
1.While in the Default Display Mode, press the ALT. MODE and ALARM LIST keys. This brings up the DataCORDER Alarm List Display Mode, which displays any alarms stored in the alarm queue.
2.To scroll to the end of the alarm list, press the Up Arrow key. Pressing the Down Arrow key will scroll the list backward.
3.The left display will show “AL#” where # is the alarms number in the queue. The right display will show “AA##,” if the alarm is active, where ## is the alarm number. “IA##,” will show if the alarm is inactive
4.“END” is displayed to indicate the end of the alarm list if any alarms are active. “CLEAr” is displayed if all the alarms in the list are inactive.
5.If no alarms are active, the alarm queue may be cleared. The exception to this rule is the DataCORDER alarm queue Full alarm (AL91), which does not have to be inactive in order to clear the alarm list. To clear the alarm list:
a.Press the ALT. MODE and ALARM LIST keys.
b.Press the Up or Down Arrow key until “CLEAr” is displayed.
c.Press the ENTER key. The alarm list will clear and “-----” will be displayed.
d.Press the ALARM LIST key. “AL” will show on the left display and “-----” on the right display when there are no alarms in the list.
e.Upon clearing of the alarm queue, the alarm light will be turned off.
The DataCORDER will record the initiation of a pre-trip test (see Section 4.5) and the results of each test included in pre-trip. The data is time-stamped and may be extracted via the Data Retrieval program. See Table 4–11 for a description of the data stored in the DataCORDER for each corresponding pre-trip test.
4.6.7DataCORDER Communications
Hardware
DataCORDER uploads or downloads on a unit with an ML3 controller can be accomplished with one of the following methods:
•Using the programming slot in the controller with the choice of hardware options:
•PCMCIA sRAM Card. (This is obsolete but still supported)
•USB Adapter with USB. (One USB for upload, one USB for download)
•MUA Adapter with USB (PN 07-00571-00). (The adapter stays in the controller)
•MST Service Tool with USB (PN 07-00572-00). (The service tool is temporary in the controller)
•Connecting a laptop to the Interrogator port.
Refer to Controller Programming procedures in the Service chapter for upload / download procedures.
Software
Downloaded and real-time data from the DataCORDER can be viewed in the original DataLINE software or the ContainerLINK™ app.
•DataLINE is the original windows program that allows interrogation, configuration variable assignment, screen view of the data, hard copy report generation, cold treatment probe calibration and file management. DataLINE 3.12 is most likely the last release of DataLINE. See DataLINE operations manual 62-10629 for detailed procedures.
•ContainerLINK is an app for smart phones, tablets and Windows computers. The functionality of the original DataLINE software is now integrated into ContainerLINK.
Sustained cold temperature has been employed as a post-harvest method for the control of fruit flies and other insect genera. The commodity, insect species, treatment temperatures and exposure times are found in sections T107, T108, and T109 of the USDA Treatment Manual.
In response to the demand to replace fumigation with this environmentally sound process, Carrier has integrated Cold Treatment capability into its microprocessor system. These units have the ability to maintain supply air temperature within one quarter degree Celsius of set point and record minute changes in product temperature within the DataCORDER memory, thus meeting USDA criteria. Information on USDA is provided in the following sub-paragraphs.
A special type of recording is used for USDA cold treatment purposes. Cold treatment recording requires three remote temperature probes be placed at prescribed locations in the cargo. Provision is made to connect these probes to the DataCORDER via receptacles located at the rear left-hand side of the unit. Four or five receptacles are provided. The four 3-pin receptacles are for the probes. The 5-pin receptacle is the rear connection for the Interrogator. The probe receptacles are sized to accept plugs with tricam coupling locking devices. A label on the back panel of the unit shows which receptacle is used for each probe.
The standard DataCORDER report displays the supply and return air temperatures. The cold treatment report displays USDA #1, #2, #3 and the supply and return air temperatures. Cold treatment recording is backed up by a battery so recording can continue if AC power is lost.
A special feature in DataLINE allows the user to enter a USDA (or other) message in the header of a data report. The maximum message length is 78 characters. Only one message will be recorded per day.
The following is a summary of the steps required to initiate a USDA Cold Treatment. If configured for USDA probes, setup can be verified as follows. This procedure is applicable for DataLINE software.
1.Ensure the DataCorder is configured as follows from the Configuration Screen (see Figure 4.9):
a.Configuration Option is set for USDA probes.
b.Logging Interval is set for 60 minutes.
c.DataCorder Sample Type is set for 2 Averaged 3-USDA.
d.Resolution is set for Normal.
Figure 4.9 DataCORDER Configuration Screen
2.Calibrate the three USDA probes by ice bathing the probes and performing the calibration function (see Figure 4.10) with the DataLINE. Refer to the Ice Bath Preparation procedure. This calibration procedure generates the probe offsets which are stored in the controller and applied to the USDA sensors for use in generating sensor type reports.
Figure 4.10 DataCorder Probe Calibration Screen
3.Pre-cool the container to the treatment temperature or below.
4.Install the DataCORDER module battery pack (if not already installed).
5.Place the three probes. See USDA Treatment Manual for directions on placement of probes in fruit and probe locations in container.
Sensor 1 |
Place the first sensor, labeled USDA1, in a box at the top of the stack of the fruit nearest to the air return intake. |
Sensor 2 |
Place the second sensor, labeled USDA2, slightly aft of the middle of the container, halfway between the top and bottom of the stack. |
Sensor 3 |
Place the third sensor, labeled USDA3, one pallet stack in from the doors of the container, halfway between the top and bottom of the stack. |
6.To initiate USDA recording, connect the personal computer and Enter ISO Trip header information (Figure 4.11) using the DataLINE software. Enter all fields along with a trip comment if desired.
Figure 4.11 DataCorder Probe Calibration Screen
e.Using the System Tools screen (see Figure 4.12) in the DataLine software perform a “Trip Start.”
Figure 4.12 DataCorder Systems Tool Screen
DataLINE provides the user with an interface to view/ modify current settings of the ISO trip header through the ISO Trip Header screen.
The ISO Trip Header screen is displayed when the user clicks on the “ISO Trip Header” button in the “Trip Functions” Group Box on the System Tools screen.
F9 function - Provides the user with a shortcut for manually triggering the refresh operation. Before sending modified parameter values, the user must ensure that a successful connection is established with the controller.
If the connection is established with the DataCORDER, the current contents of the ISO Trip Header from the DataCORDER will be displayed in each field. If the connection is not established with the DataCORDER, all fields on the screen will be displayed as “Xs.” If at any time during the display of the ISO Trip Header screen the connection is not established or is lost, the user is alerted to the status of the connection.
After modifying the values and ensuring a successful connection has been made with the DataCORDER, click on the “Send” button to send the modified parameter values.
The maximum allowed length of the ISO Trip Header is 128 characters. If the user tries to refresh the screen or close the utility without sending the changes made on the screen to the DataCORDER, the user is alerted with a message.
