4.1TEMPERATURE CONTROL MICROPROCESSOR SYSTEM
The temperature control Micro-Link 3 microprocessor system (see Figure 4.1) consists of a keypad, display module, the control module (controller) and interconnecting wiring. The controller houses the temperature control software and the DataCORDER software. The temperature control software functions to operate the unit components as required to provide the desired cargo temperature and humidity.
The DataCORDER software functions to record unit operating parameters and cargo temperature parameters for future retrieval. Coverage of the temperature control software begins with Section 4.2. Coverage of the DataCORDER software is provided in Section 4.8.
The keypad and display module 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. The components are designed to permit ease of installation and removal
Figure 4.1 Temperature Control System
The key pad (Figure 4.2) is mounted on the control box door. The key pad consists of eleven push button switches that act as the user’s interface with the controller. Descriptions of the key pad switch functions are provided in Table 4–1.
The display module (Figure 4.3) consists of two five digit displays and seven indicator lights. The indicator lights include:
•COOL - White or Blue LED: Energized when the refrigerant compressor is energized.
•HEAT - Orange LED: Energized to indicate heater operation in heat mode, defrost mode, or dehumidification.
•DEFROST - Orange LED: Energized when the unit is in defrost mode.
•IN RANGE - Green LED: Energized when the controlled temperature probe is within specified tolerance of set point.
The controlling probe in perishable range will be the SUPPLY air probe and the controlling probe in frozen range will be the RETURN air probe.
•ALARM - Red LED: Energized when there is an active or an inactive shutdown alarm in the alarm queue.
•SUPPLY - Yellow LED: Energized when the supply air probe is used for control. When this LED is illuminated, the temperature displayed in the AIR TEMPERATURE display is the reading at the supply air probe. This LED will flash if dehumidification is enabled.
•RETURN - Yellow LED: Energized when the return air probe is used for control. When this LED is illuminated, the temperature displayed in the AIR TEMPERATURE display is the reading at the return air probe. This LED will flash if dehumidification is enabled.
Do not remove wire harnesses from controller modules unless you are grounded to the unit frame with a static safe wrist strap.
Unplug all controller module wire harness connectors before performing arc welding on any part of the container.
Do not attempt to use an ML2i PC card in an ML3 equipped unit. The PC cards are physically different and will result in damage to the controller.
Do not attempt to service the controller modules. Breaking the seal will void the warranty.
The Micro-Link 3 controller is a dual module microprocessor as shown in Figure 4.4. It is fitted with test points, harness connectors and a software card programming port.
2.Micro-Link 3 Control/DataCORDER Module
6.Control Circuit Power Connection
8.Battery Pack (Standard Location)
- - - - -
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 in order to ensure proper air flow across the evaporator coil.
•Provide default independent readouts of set point 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 set point 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 provided in Table 4–2. Change to the factory-installed configuration software is achieved via a configuration card or by communications.
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 operator 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 provided in Table 4–3.
To access the function codes, perform the following:
1.Press the CODE SELECT key, then press an arrow key until the left window displays the desired code number.
2.The right window will display the selected function code value for five seconds before returning to normal display mode.
3.If additional time is required, pressing the ENTER key will extend the display time to 30 seconds.
4.3CONTROLLER SEQUENCE AND MODES OF OPERATION
General operation sequences for cooling, heating and defrost are provided in the following sub-paragraphs. Schematic representation of controller operation is provided in Figure 4.5 and Figure 4.8.
Operational software responds to various inputs. These inputs come from the temperature sensors and pressure transducers, the temperature set point, 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 and condenser fan motors to rotate in the wrong direction, the controller will energize or de-energize relay TCP as required (see Figure 8.2). 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, TG, 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 start up.
4.3.3Perishable Mode Temperature Control
In Perishable Mode, the controller maintains the supply air temperature at set point, 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 set points above -10°C (+14°F). When CnF26 is set to -5°C, perishable mode is active with set points above -5°C (+23°F).
Perishable Steady State is used to maintain he control temperature near a set point that is above the heat lockout temperature.
On a properly loaded box, the unit will operate in steady state mode. This results in unloaded operation by cycling the DLV and DUV to limit capacity and maintain steady temperature control.
The unit is capable of maintaining supply to within +/-0.2°C (+/-0.36°F) of set point. Supply air temperature is controlled by positioning of the EEV, cycling of DLV and DUV, cycling of the compressor, and cycling of the heaters.
4.3.5Perishable Idle, Air Circulation
Perishable Idle Mode is used when it is unnecessary to run the compressor to maintain control temperature. If temperature drops to 0.2°C (0.36°F) above set point, the controller determines 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 (+0.36°F) above set point, the unit will transition back to perishable steady state.
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 set point, 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 (0.36°F) below the set point, and the heaters will de-energize.
When the system is in Perishable Pulldown Mode, the highest priority is given to bringing the container down to set point. When cooling from a temperature that is more than 2.5°C (4.5°F) above set point, the system will be in perishable pulldown mode in economized operation. However, pressure and current limit functions may restrict the valves if either exceeds the preset value.
Once set point is reached, the unit will transition to perishable steady state mode. This results in unloaded operation by cycling the DLV and DUV to limit capacity and maintain steady temperature control.
Figure 4.5 Controller Operation - Perishable Mode
4.3.8Perishable Dehumidification
Dehumidification is provided to reduce the humidity levels inside the container, the dehumidification set point range is from 50% to 95%. Dehumidification is activated when a humidity value is set at Cd33. During dehumidification operation the condenser fan speed is fixed in high speed. 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 set point (Cd33).
•The unit is in perishable steady state and supply air temperature is less than 0.25°C (0.45°F) above set point.
•The heater debounce timer (three minutes) has timed out.
•Heater termination thermostat (HTT) is closed.
If the previously mentioned 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 4 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 set point, 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 set point.
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 set point, the controller de-energizes the heat relay. The controller will continue to cycle heating to maintain relative humidity below the selected set point. 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:
•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 set point criteria are satisfied.
•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 set points.
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 set points 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 set point 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 set point must be selected prior to activation. When economy fan mode is active, the evaporator fans will be controlled as follows:
At the start of each cooling or heating cycle, the evaporator fans will run in high speed for three minutes. They will then be switched to low speed any time the supply air temperature is within +/- 0.2°C (0.36°F) of the set point and the return air temperature is less than or equal to the supply air temperature +3°C (5.4°F). The fans will continue to run in low speed for one hour. 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 set point and decreasing, the unit will cool with the condenser fan motor (CF and FS), compressor motor (CH), evaporator fan motors (EF) energized, and the white COOL light illuminated. (See Figure 4.6).
Figure 4.6 Perishable Mode Cooling
b.When supply air temperature decreases to a predetermined tolerance above set point (Cd30), the green IN RANGE light is illuminated.
c.Condenser fan speed will change dependent on the following conditions:
Change high speed to low speed (LC):
Compressor loading ratio falls below 38%
Change low speed to high speed:
Compressor loading ratio above 45%
If compressor discharge pressure is above 200psig and condenser fan speed is high speed, then it will ratio.
d.The controller continuously monitors supply air temperature. Once the supply air temperature falls below set point, the controller periodically records supply air temperature, set point and time. A calculation is then performed to determine temperature drift from set point 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.
e.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 set point.
f.If the supply air temperature increases to 0.2°C (0.36°F) above set point, contacts TC and TN close to restart the compressor and condenser fan motors in standard steady state operation. The white COOL light is also illuminated.
g.If the supply air increases more than 2.5°C (4.5°F) above set point temperature, contacts TS will close to energize and open the ESV, placing the unit in pull down mode.
4.3.12Perishable Mode Heating - Sequence of Operation
a.If the supply air temperature decreases 0.5°C (0.9°F) below set point, the system enters the heating mode. (See Figure 4.5). The controller closes contacts TH (see Figure 4.7) 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 (0.36°F) below set point, 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 4.7 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 set point, 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 set points below -10°C (+14°F). When CnF26 is set to -5°C, frozen mode is active with set points below -5°C (+23°F).
When the system is in Frozen Mode, the highest priority is given to bringing the container down to set point, 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.
When temperature drops to set point 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 set point +0.2°C, (0.4°F) the unit will transition back to the frozen steady state mode.
Figure 4.8 Controller Operation - Frozen Mode
If the temperature drops 10°C (18°F) below set point, 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 set point 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 set point -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 set point +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 set point +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 set point 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 4.9).
b.When the return air temperature decreases to a predetermined tolerance above set point, the green INRANGE light is illuminated.
c.When the return air temperature decreases to 0.2°C (0.4°F) below set point, 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 set point.
e.If return air temperature drops to 10°C (18°F) or more below set point, the evaporator fans increase to high speed.
f.When the return air temperature increases to 0.2°C (0.4°F) above set point 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.
Defrosting 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. For more information on Probe Check refer to Section 5.9.
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.
Initiation of defrost is dependent on the state of the Defrost Temperature Sensor (DTS). When then (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: A manual defrost is initiated by pressing the MANUAL DEFROST/INTERVAL key for greater than 5 seconds.
2.Timer: The Defrost Interval Timer reaches the user selectable Interval. The user-selected intervals are (OFF), 3, 6, 9, 12, 24 hours, AUTO, or PuLS; factory default is 3 hours. Refer to code select CD27 (Table 4–2).
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 setpoints, evaporator fan pulsing can be used during Defrost/De-ice when the “PuLS” option is selected in the Defrost Interval function select code. When enabled, evaporator fan pulsing will occur based on the unit temperature setpoint and the Evaporator Fan Pulsing Temperature Setting (Cd60). QUEST II also pulses the evaporator fans during Defrost/De-ice within a narrow perishable setpoint 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.Remote: An Initiate Defrost command is sent via communications.
6.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 8.
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 Parameters
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.
Defrost Timer
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 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.
If any Auto Pretrip 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”.
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 (AL59 & AL60). If the HTT does not open and termination does not occur within two hours, the controller will terminate defrost. AL60 will be activated to inform of a possible DTS failure.
4.4PROTECTION MODES OF OPERATION
Opening of an evaporator fan internal protector will shut down the unit.
Function code Cd29 may be operator set to select action the controller will take upon system failure. The factory default is full system shutdown. Refer to Table 4–3.
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. Refer to Table 4–3.
4.4.4Compressor 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, return air temperature is less than -17.5°C and the compressor discharge temperature is greater than 117.7°C.
Dome temperature control logic will disengage when return air temperature and ambient temperature return to allowed limits or when the compressor turns off.
4.4.5Compressor Low Pressure Protection
If the suction pressure low limit is triggered, the DUV will energize to raise the suction pressure.
4.4.6Perishable 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.
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 DLV/DUV is cycling at less than 80% capacity when the controller calls for it to be 100% open, the condenser fan is energized. When the DLV/DUV regains full capacity, 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.
Compressor-Cycle Perishable Cooling (CCPC) is a method of temperature control used during steady-state perishable cooling 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 CCPC pulldown phase:
During setpoint pulldown supply air temperature is controlled according to the unit’s nominal supply air setpoint.
During CCPC pulldown the supply air temperature is lowered somewhat relative to the nominal setpoint. Evaporator fans are forced to operate at high speed.
Steady-state CCPC control maintains the same lowered supply air temperature that was used during CCPC 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 the alarms is provided in Table 4–6.
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:
a.The red ALARM light will energize for critical alarm code numbers 17, 20, 21, 22, 23, 24, 25, 26, and 27.
b.If a detectable problem exists, its alarm code will be alternately displayed with the set point on the left display.
c.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 depressing 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, refer to Table 4–6.
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 the ENTER key. The alarm list will clear and “-----” will be displayed.
AL26 is active when all of the sensors are not 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.
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 diagnostics should not be performed with critical temperature cargoes in the container.
When PRE-TRIP key is pressed, economy, dehumidification and bulb mode will be deactivated. At the completion of Pre-trip activity, 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 provided in Table 4–4. Detailed operating instructions are provided in Section 5.8.
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 (see Figure 4.1) 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.
DataCORDER settings:
•Configuration Software
•Operational Software
•Data Storage Memory
•Real Time Clock (with internal battery backup)
•Six Thermistor Inputs
•Interrogation Connections
•Power Supply (battery pack)
DataCORDER 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
•Set Point 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
The DataCORDER Software is subdivided into Operational Software, Configuration Software, and the Data Memory.
Operational Software
The Operational Software reads and interprets inputs for use by the Configuration Software. The inputs are labeled Function Codes. Controller functions (see Table 4–5) which the operator may access to examine the current input data or stored data. To access these 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 five minutes.
Configuration Software
The recording and alarm functions of the DataCORDER are based on the configurations. 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 listing of the configuration variables is provided in Table 4–2. Descriptions of DataCORDER operation for each variable setting are provided in the following paragraphs.
4.8.3Sensor Configuration (dCF02)
Two modes of operation may be configured: the Standard Mode and the Generic Mode.
Standard Mode
In Standard Mode, the user may configure the DataCORDER to record data using one of seven standard configurations.
The seven standard configuration variables, with their descriptions, are listed in Table 4–3.
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. Figure 4.11
The DataCORDER software uses the supply and return recorder sensors (SRS, RRS). The temperature control software uses the supply and return temperature sensors (STS, RTS).
Generic Mode
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. A list of data points available for recording follows. Changing the configuration to generic and selecting which data points to record may be done using the Carrier Transicold Data Retrieval Program.
1.Control mode
2.Control temperature
3.Frequency
4.Humidity
5.Phase A current
6.Phase B current
7.Phase C current
8.Main voltage
9.Evaporator expansion valve percentage
10.Discrete outputs (Bit mapped - require special handling if used)
11.Discrete inputs (Bit mapped - require special handling if used)
12.Ambient temperature sensor (AMBS)
13.Evaporator temperature sensor (ETS)
14.Compressor discharge sensor (CPDS)
15.Return temperature sensor (RTS)
16.Supply temperature sensor (STS)
17.Defrost temperature sensor (DTS)
18.Discharge pressure transducer (DPT)
19.Suction pressure transducer (SPT)
20.Flash tank pressure transducer (FPT)
21.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).
4.8.5Thermistor Format (dCF04)
The user may configure the format in which 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.
CONFIG NO. |
TITLE |
DEFAULT |
OPTION |
|---|---|---|---|
dCF01 |
(Future Use) |
-- |
-- |
dCF02 |
Sensor Configuration |
2 |
2, 5, 6, 9, 54, 64, 94 |
dCF03 |
Logging Interval (Minutes) |
60 |
15, 30, 60, 120 |
dCF04 |
Thermistor Format |
Short |
Long |
dCF05 |
Thermistor Sampling Type |
A |
A,b,C |
dCF06 |
Controlled Atmosphere / Humidity Sampling Type |
A |
A,b |
dCF07 |
Alarm Configuration USDA Sensor 1 |
A |
Auto, On, Off |
dCF08 |
Alarm Configuration USDA Sensor 2 |
A |
Auto, On, Off |
dCF09 |
Alarm Configuration USDA Sensor 3 |
A |
Auto, On, Off |
dCF10 |
Alarm Configuration Cargo Sensor A |
A |
Auto, On, Off |
Figure 4.11 Standard Configuration Download Report
Standard Configuration |
Description |
|---|---|
2 sensors (dCF02=2) |
2 thermistor inputs (supply & return) |
5 sensors (dCF02=5) |
2 thermistor inputs (supply & return) 3 USDA thermistor inputs |
6 sensors (dCF02=6) |
2 thermistor inputs (supply & return) 3 USDA thermistor inputs 1 humidity input |
9 sensors (dCF02=9) |
Not Applicable |
6 sensors (dCF02=54) |
2 thermistor inputs (supply & return) 3 USDA thermistor inputs 1 cargo probe (thermistor input) |
7 sensors (dCF02=64) |
2 thermistor inputs (supply & return) 3 USDA thermistor inputs 1 humidity input 1 cargo probe (thermistor input) |
10 sensors (dCF02=94) |
2 thermistor inputs (supply & return) 3 USDA thermistor inputs 1 humidity input 1 cargo probe (thermistor input) |
4.8.6Sampling Type (dCF05 & dCF06)
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.
4.8.7Alarm 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.
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 DataCORDER will record the initiation of a Pre-trip test (refer to Section 5.8) and the results of each test included in Pre-trip. The data is time-stamped and may be extracted via the Data Retrieval program. Refer to Table 4–6 for a description of the data stored in the DataCORDER for each corresponding Pre-trip test.
4.8.10DataCORDER Communications
Data retrieval from the DataCORDER can be accomplished by using the DataLINE, DataBANK Card, or a communications interface module.
A DataLINE or a communications interface
module display of Communication Failed is caused by faulty data transfer
between the DataCORDER and the data retrieval device.
Common causes include:
1.Bad cable or connection between DataCORDER and data retrieval device.
2.PC communication port(s) unavailable or mis-assigned.
Configuration identification for the models covered herein may be obtained on the Container Products Group Information Center by authorized Carrier Transicold Service Centers.
a.DataLINE
The DataLINE software for a personal computer is supplied on both floppy disks and CD. This software allows interrogation, configuration variable assignment, screen view of the data, hard copy report generation, cold treatment probe calibration and file management. Refer to Data Retrieval manual 62-10629 for a more detailed explanation of the DataLINE interrogation software. The DataLINE manual may be found on the internet at www.container.carrier.com.
b.DataBANK Card
The DataBANK™card is a PCMCIA card that interfaces with the controller through the programming slot and can download data at a fast rate. Files downloaded to DataBANK card files are accessible through an Omni PC Card Drive. The files can then be viewed using the DataLINE software.
c.Communications Interface Module
The communications interface module is a slave module, which allows communication with a master central monitoring station. The module will respond to communication and return information over the main power line.
With a communications interface module installed, all functions and selectable features that are accessible at the unit may be performed at the master station. Retrieval of all DataCORDER reports may also be performed. Refer to the master system technical manual for further information.
Sustained cold temperature has been employed as an effective postharvest method for the control of Mediterranean and certain other tropical fruit flies. Exposing infested fruit to temperatures of 2.2°C (36°F) or below for specific periods results in the mortality of the various stages of this group of insects.
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.USDA Recording
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.
b.USDA/ Message Trip Comment
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.
4.8.12USDA Cold Treatment Procedure
The following is a summary of the steps required to initiate a USDA Cold Treatment:
a.Calibrate the three USDA probes by ice bathing the probes and performing the calibration function with the DataLINE. This calibration procedure determines the probe offsets and stores them in the controller for use in generating the cold treatment report. Refer to the Data Retrieval manual 62-10629 for more details.
b.Pre-cool the container to the treatment temperature or below.
c.Install the DataCORDER module battery pack (if not already installed).
d.Place the three probes. The probes are placed into the pulp of the product (at the locations defined in the following table) as the product is loaded.
Sensor 1 |
Place in pulp of the product located next to the return air intake. |
Sensor 2 |
Place in pulp of the product five feet from the end of the load for 40 foot containers, or three feet from the end of the load for 20 foot containers. This probe should be placed in a center carton at one-half the height of the load. |
Sensor 3 |
Place in pulp of product five feet from the end of the load for 40 foot containers or three feet from the end of the load for 20 foot containers. This probe should be placed in a carton at a side wall at one-half the height of the load. |
e.To initiate USDA recording, connect the personal computer and perform the configuration as follows, using the DataLINE software:
1.Enter ISO header information.
2.Enter a trip comment if desired.
3.Configure the DataCORDER for five probes (s, r, P1, P2, P3) (dcf02=5).
4.Configure the logging interval for one hour.
5.Set the sensor configuration to “USDA.”
6.Configure for two byte memory storage format (dcf04=LONG).
7.Perform a “trip start.”
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 provided in Table 4–7. Refer to Section 4.8.7 for configuration information.
To display alarm codes:
1.While in the Default Display mode, press the ALT. MODE & ALARM LIST keys. This accesses the Data-CORDER 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. Depressing 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:
1.Press the ALT. MODE & ALARM LIST keys.
2.Press the UP/DOWN ARROW key until “CLEAr” is displayed.
3.Press the ENTER key. The alarm list will clear and “-----” will be displayed.
4.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.
5.Upon clearing of the alarm queue, the alarm light will be turned off.
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.
4.9CONTROLLER CONFIGURATION VARIABLES
Configuration numbers with an “ * ” must be changed to the
bold option for a default controller to operate on a PrimeLINE Edge Unit.
Configuration numbers with a bold option should be changed for a default
controller to operate on a PrimeLINE Edge Unit.
CODE # |
TITLE |
DESCRIPTION |
|---|---|---|
If the function is not applicable, the display will read “-----” |
||
Display Only Functions - Cd01 through Cd26 are display only functions. |
||
Display Only Functions |
||
Cd01 |
Digital Unloader Valve Closed (%) |
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. |
Cd03 |
Compressor Motor Current |
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. The compressor leg T3 current is displayed. |
Cd04
Cd05
Cd06 |
Line Current, Phase A
Line Current, Phase B
Line Current, Phase C |
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. |
Cd07 |
Main Power Voltage |
The main supply voltage is displayed. |
Cd08 |
Main Power Frequency |
The value of the main power frequency is displayed in Hertz. The frequency displayed will be halved if either fuse F1 or F2 is bad (alarm code AL21). |
Cd09 |
Ambient Temperature |
The ambient sensor reading is displayed. |
Cd10 |
Evaporator Temperature Sensor |
Evaporator temperature sensor reading is shown on the right display. |
Cd11 |
Compressor Discharge Temperature |
Compressor discharge temperature sensor reading, using compressor dome temperature, is displayed. |
Cd12 |
Compressor Suction Pressure |
Reading for evaporator pressure transducer (EPT) is shown on the left display; Press ENTER at Cd12 to show reading for compressor suction port pressure on right display. |
Cd14 |
Compressor Discharge Pressure |
Compressor discharges pressure transducer reading is displayed. |
Cd15 |
Digital Unloader Valve |
The status of the valve is displayed (Open - Closed). |
Cd16 |
Compressor Motor Hour Meter/Unit Run Time Hour Meter |
This code displays the compressor motor hours. 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. |
Cd17 |
Relative Humidity % |
Humidity sensor reading is displayed. This code displays the relative humidity, as a percent value. |
Cd18 |
Software Revision # |
The software revision number is displayed. |
Cd19 |
Battery Check |
This code 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. |
Cd20 |
Config/Model # |
This code indicates the dash number of the model for which the Controller is configured (i.e., if the unit is a 69NT40-551-100, the display will show “51100”). 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. |
Cd21 |
Capacity Mode |
The mode of operation is displayed (Unloaded - Standard - Economized). |
Cd22 |
Compressor State |
The status of the compressor is displayed (OFF, On). |
Cd23 |
Evaporator Fan |
Displays the current evaporator fan state (OFF, LOW, HIGH). |
Cd25 |
Compressor Run Time Remaining Until Defrost |
This code 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. |
Cd26 |
Defrost Temperature Sensor Reading |
Defrost temperature sensor reading is displayed. |
Configurable Functions |
||
Function codes Cd27 through Cd37 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container. |
||
Cd27 |
Defrost Interval (Hours or Automatic) |
This is the desired period of time between defrost cycles. Factory default is 3 hours. Refer to Section 4.3.20 for information on Defrost Interval. 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. 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 Pretrip 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”. |
Cd28 |
Temperature Units (Degrees C or Degrees F) |
This code determines the temperature units (C or F) that will be used for all temperature displays. 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. |
Cd29 |
Failure Action (Mode) |
If all of the control sensors are out of range (alarm code AL26) or there is a probe circuit calibration failure (alarm code AL27), the unit will enter the shutdown state defined by this setting. The user selects one of four possible actions as follows: 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 set points.) d - Full System Shutdown - Factory Default (Shut down every component in the unit.) |
Cd30 |
IIn-Range Tolerance |
The in-range tolerance will determine the temperature band around the set point which will be designated as in-range. 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 If the control temperature is in-range, the green IN-RANGE light will be illuminated. In-range tolerance shall be set to +/- 2.0°C upon activation of dehumidification or bulb mode (Cd33, Cd35, Cd48). When CCPC 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. |
Cd31 |
Stagger Start Offset Time (Seconds) |
The stagger start offset time is the amount of time that the unit will delay at start-up, thus allowing 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. |
Cd32 |
Current Limit (Amperes) |
The current limit 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. |
Cd33 |
Humidity Setpoint |
This is the value in percent to which the system will dehumidify or humidify. There are configuration variables that determine whether dehumidification/humidification capabilities are installed. In the test mode, the setpoint will be temporarily set to 1%, allowing the test of dehumidification. After 5 minutes, the normal setpoint is restored. If unit is configured for HUMIDIFICATION MODE then selection of a setpoint greater than 75% will activate humidification, and a setpoint less than or equal to 75% will activate dehumidification. If the unit is configured for dehumidification only, then the entire setpoint range will apply to dehumidification. If Pretrip is initiated, this value will be set to “OFF” automatically. (Replaced by Cd48 interface if CnF50 Enhanced Bulb Mode Interface is active.) |
Cd34 |
Economy Mode (On-Off) |
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. |
Cd35 |
Bulb Mode |
The current state of the bulb mode option, “-----”, nOr, or bULb. (Replaced by Cd48 if CnF50, Enhanced Bulb Mode, is active.) 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 set point 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. |
Cd36 |
Evaporator Fan Speed Select |
This is the desired evaporator fan speed for use during the bulb Dehumidification and Humidification mode option. (Replaced by Cd48 if CnF50, Enhanced Bulb Mode, is active.) This code is enabled only if in the dehumidification mode (Cd33) 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 set point 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.” |
Cd37 |
Variable DTT Setting (Bulb Mode) |
This is the variable defrost termination thermostat setting to be used with the optional bulb mode functionality. This item is only displayed if the bulb mode option is configured on. (Replaced by Cd48 interface if CnF50 Enhanced Bulb Mode Interface is active.) |
Display Only Functions - Cd38 through Cd40 are display only functions. |
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Cd38 |
Secondary Supply Temperature Sensor |
Cd38 will display the current supply recorder sensor (SRS) reading for units configured for four probes. If the unit is configured with a DataCORDER, Cd38 will display “-----.” If the DataCORDER suffers a failure, (AL55) Cd38 will display the supply recorder sensor reading. |
Cd39 |
Secondary Return Temperature Sensor |
Cd39 will display the current return recorder sensor (RRS) reading for units configured for four probes. If the unit is configured with a DataCORDER, Cd39 will display “-----.” If the DataCORDER suffers a failure, (AL55) Cd39 will display the return recorder sensor reading. |
Cd40 |
Container Identification Number |
If a valid container id exists, the default display for Cd40 will be “cd40_XXXXX” where “XXXXX” is the 5th character through the 9th character of the container id. Pressing the Enter key on Cd40 will display “id_YYYYYYY” 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 default display will have Cd40 on the left display and 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. |
Cd41 |
Valve Override |
SERVICE FUNCTION: This code is used for troubleshooting, and allows manual positioning of the economizer solenoid valve, electronic expansion valve, and digital unloader valve. Provides readings such as: Percent Capacity, EEV, Capacity Mode, LIV and DUV. Refer to paragraph 6.21 for operating instructions. |
For Units configured for eAutoFresh Cd43 and Cd44 using the following: |
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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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Cd43 |
eAutoFresh Mode |
Cd43 is a user selectable mode of operation that allows the opening and closing of a mechanical air vent door via a stepper motor. These selection modes are as follows: OFF - Air makeup vent will remain closed. USER - Allows for manual selection of the setting. DELAY -The opening of the door is based on selected time, return temperature and flow rate (percent opened). gASLM - The opening is based percent open and CO2 and O2 selectable limits (LM). This selection is only active if the unit has a CO2 sensor. TEST / CAL (CO2 sensor option units only) - The door will fully open and close to allow the user to inspect its operation. If CAL is selected, the controller will zero calibrate the CO2 sensor input. If the unit is not configured with AutoFresh, the Cd43 will display “----” Refer to Section 5.4.3 for description of operational parameters. |
Display Only Function - Cd44 is a display only function. |
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Cd44 |
eAutoFresh Values / CO2 Sensor Status |
Code Cd44 displays the eAutoFresh CO2 and O2 values (CO2 and O2) and CO2 and O2 limits (CO2 LIM and O2 LIM), respectively. This function code will be dashed out if not configured for eAutoFresh. This function code will be dashed if CO2 sensor is not detected, and a sensor is not expected (didn’t have one previously). This function code will display “ChECK” if a CO2 sensor has not been auto-detected at the most recent power-up and was detected at a previous power-up. If “ChECK” is displayed and the ENTER key is pressed, “SEnSr” is displayed with the choices of “YES” and “no”: “YES” – sensor should be remembered as detected (present) “no” – sensor should not be remembered as being detected (not present) |
For Units configured for XtendFRESH Cd43 and Cd44 using the following: |
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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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Cd43 |
XtendFresh Mode |
Cd43 is a user selectable mode of operation that allows the opening and closing of an air vent door and CO2 scrubber unit. These selection modes are as follows: OFF - Vent will remain closed and scrubber will remain off. XTEND - The opening of the vent and activation of the scrubber will be controlled based upon CO2 and O2 concentration values and selectable set points. This selection is only active if the unit has a CO2 or O2 sensor. TEST - Selecting “TEST” will open/close the vent and activate/deactivate the scrubber to allow the user to confirm operation. If “CAL” is selected, the controller will provide options for zero calibration of the CO2 sensor input and span calibration of the O2 sensor input. If the unit is not configured for XtendFRESH or eAutoFresh, the Cd43 will display “−−−−”. Refer to section 4.6.1 for description of operational parameters. |
Display Only Function - Cd44 is a display only function. |
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Cd44 |
XtendFRESH Values / CO2 Sensor Status |
If a user presses Enter, the CO2 value will be displayed. Pressing Enter again will display the O2 value. This function code will be dashed out if not configured for XtendFRESH or eAuto-Fresh. This function code will be dashed if CO2 and O2 sensors are not detected, and sensors are not expected. |
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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Cd45 |
Vent Position Sensor (VPS) Position |
Values: 0 to 240 for UPPER / 0 to 225 for LOWER This function code will be dashed out if not configured for VPS. When configured for VPS, Cd45 displays the current vent position in units of 5 CMH (units displayed as “CM”) or CFM (units 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 sensor unless AL50 is active. Cd45 will display for 30 seconds, then time out and return to the normal display mode. |
Cd46 |
Airflow Display Units |
Selects the airflow units to be displayed by Cd45 if configured for Vent Position Sensor 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. |
Cd47 |
Variable Economy Temperature Setting |
Used when Economy Mode (CnF22) is set to 3-cust. Display will show “----” when 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 3 minutes. After three minutes, the evaporator fans will be switched to low speed any time that the supply temperature is within +/- 0.25C 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). |
Cd48 |
Dehumidification / Bulb Cargo Mode Parameter Selection |
Initially Cd48 will display current dehumidification-mode; bUlb - bulb cargo mode, dEhUM - normal dehumidification, or OFF - off. This display is steady. 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. Pressing CODE SELECT key in a selection menu cancels the current selection activity and ascends back up to the next higher selection menu (or to Cd48 display mode if that is the next higher). If the operator does not press any key for five seconds the interface reverts to normal system display and the current selection menu is canceled, but any previously committed changes are retained. Available parameters and parameter ranges are a function of configuration options and previously selected parameters as indicated above.
Whenever any pretrip 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 set point 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 set point 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. |
Display Only Function - Cd49 is a display only function. |
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Cd49 |
Days Since Last Successful Pre-trip |
Displays the number of days since last successful pretrip sequence. Press ENTER to view the number of days since the last successful pretrip for Auto1, Auto2, and Auto2 in sequence. Press CODE SELECT to step back through the list and ultimately to exit the Cd49 display. |
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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Cd50 |
CCPC Disabled |
”OFF” = disabled. ”On” = enabled. ”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 CCPC. ”PrtrP” = pretrip active. ”C LIM” = suspended by cool limit logic. ”PULL” = pulldown active. “ALArM ” = suspended by shutdown alarm Press enter, arrow keys, and then enter to select ”OFF” or ”On”. If ”On” is selected, CCPC operation may be suspended as indicated by one of the suspension codes listed above. If CCPC is not ”OFF” and is not suspended, ”On” will be displayed. |
Cd51 |
Automatic Cold Treatment Parameter Selection |
ACT-mode: Cd51 increments of (1 day)_(1hr), Display: default “0_0 “ “done” mm-dd this will be display is ACT has completed “ACt” value “On” “OFF” or “----“Display /Select: default “OFF“ “trEAt” value C / F on 0.1 degree increments Display/Select: default “0.0C“ “DAyS” value “0 – 99” increments of 1 Display/Select: default “0“ “ProbE” value Probe positions ex ’1 2 _ 4’ ’1 _ 3 _’ Display: default “---- “ “SPnEW” value C / F on 0.1 increments Display/Select: default “10.0C “ Initially Cd51 will display current countdown timer increments of (1 day)_(1hr), default“0_0 Pressing ENTER key will take the interface down into a hierarchy of parameter selection menus (act, treat, days, probe and spnew setting). Pressing ENTER key in any of the parameter selection menus 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. Pressing CODE SELECT key in a selection menu cancels the current selection activity and ascends back up to the next higher selection menu (or to Cd51 display mode if that is the next higher). 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. Available parameters and parameter ranges are a function of configuration options and previously selected parameters as indicated above. Parameter with the exception of “Act” may not be altered if Cd51 is re-entered if “Act” is “On”. When ACT has completed including reaching the new setpoint “done” on the left display and the MONTH DAY of completion on the right display will be displayed as the second entry in the menu. 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. Whenever any auto Pre-trip test or Trip Start is initiated, ACT mode goes to OFF. |
Cd53 |
Automatic Set point Change Mode Parameter Selection |
ASC-mode: Cd53 increments of (1 day)_(1hr), Display: default “0_0 “ “done” mm-dd this will be display is ASC has completed “ASC” value “On” “OFF” Display /Select: default “OFF“ “nSC” value “1 - 6“ (This is the value “n” for the subsequent entries). “SP (n-1)” value C / F on 0.1 degree increments Display/Select: default “10.0C“ “DAY (n-1)” value “1 – 99” increments of 1 Display/Select: default “1“ “SP (n)” value C / F on 0.1 degree increments Display/Select: default “10.0C Initially Cd53 will display current count down timer increments of (1 day)_(1hr), default “0_0 Pressing ENTER key will take the interface down into a hierarchy of parameter selection menus, (mode, act, treat, days, probe and spnew setting). Pressing ENTER key in any of the parameter selection menus selects 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. Pressing CODE SELECT key in a selection menu cancels the current selection activity and ascends back up to the next higher selection menu (or to Cd53 display mode if that is the next higher). 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. Available parameters and parameter ranges are a function of configuration options and previously selected parameters as indicated above. Parameter with the exception of “ASC” may not be altered if Cd53 is re-entered if “ASC” is “On”. When ASC has completed including reaching the last setpoint “done” on the left display and the MONTH DAY of completion on the right display will be displayed as the second entry in the menu. Turning ASC off clears this entry. This action also resets Cd53 to initial time remaining. ASC must then be turned on to view or modify the additional parameters. Whenever any auto pretrip test or Trip Start is initiated, ASC mode goes to OFF. |
Display Only Functions - Cd54 through Cd58 are display only functions. |
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Cd54 |
Suction Port Superheat / Electronic Expansion Valve Status |
Reading for evaporator superheat (suction temperature minus suction saturation temperature as calculated from suction pressure) is shown on the right display. Press ENTER at Cd54 to show reading for EEV position (in %) on left display. |
Cd55 |
Discharge Superheat |
Cd55 will display 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. “-----” will be displayed if selection is not valid. |
Cd58 |
Water Pressure Switch / Condenser Fan Switch State or Override Logic State |
Cd58 will display “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. NOTE: 1.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. 2.The right display will flash if the WPS/CFS Override Logic is TRUE on all units. This is always the case, whether the unit has a WPS or CFS installed or not. 3.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. |
Configurable Functions - Cd59 through Cd61 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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Cd59 |
Pump Down Logic |
Cd59 allows operation 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 P dN” 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. |
Cd60 |
Evaporator Fan Pulsing Temperature Setting |
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 Pretrip or Trip Start is initiated at which time the temperature will set to the default setting. |
Cd62 |
High Speed Evaporator Fan Setting |
Cd62 is used to force evaporator fan speed 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 pretrip test is initiated. Event 99 shall be logged when ever CD62 is Turned ON OR if CD62 state is ON at Mid night. Event 100 shall be logged when ever CD62 is Turned OFF OR if CD62 is dashed out from ON state to OFF state due to setpoint change to frozen range. “-----” will be displayed if setpoint is in frozen range OR if Cnf66 is configured OFF. |
Cd63 |
Enhanced Economy Mode |
Cd63 is used to enable Enhanced Economy Mode (EEM). 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 . If “On”, this function select code will be set to “OFF” when any trip start occurs or any pretrip test is initiated. Event 120 shall be logged when ever CD63 is Turned ON OR if CD63 state is ON at Mid night. “-----” will be displayed if Cnf72 is configured OFF. |
Cd64 |
Alternative Compressor Selection PrimeLine w/ Edge Technology |
Cd64 is used to allow the use of a standard PrimeLine compressor in a PrimeLine with edge technology unit. When “Std” is selected The Minimum allowable capacity ratio will be set to 10%, Standard PrimeLine current limiting logic will be utilized, the original PrimeLine P6-7 test will be used during PreTrip, and the DLV will remain de-energized. “-----” will be displayed if Cnf57 is configured “0” or “1”. |
Figure 4.12 Alarm Troubleshooting Sequence
4.11CONTROLLER ALARM INDICATIONS
AL03 |
Loss of Superheat Control |
|
|---|---|---|
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. |
|
|
Component |
Electronic Expansion Valve (EEV) |
|
Troubleshooting |
Check the operation of the EEV using Cd41. |
|
Corrective Action |
Replace EEV if defective. |
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|
Component |
Evaporator Temperature Sensor(s) ETS & ETS1. |
|
Troubleshooting |
Verify accuracy of temperature sensors, refer to Sensor Checkout Procedure Section 7.25.1. |
|
Corrective Action |
Replace ETS or ETS1 if defective. |
|
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|
|
Component |
Evaporator Fans |
|
Troubleshooting |
Confirm fans operating properly |
|
Corrective Action |
Replace fan(s) if defective, refer to EVAPORATOR FAN MOTOR ASSEMBLY Section 7.14.1. |
AL05 |
Manual Defrost Switch Failure |
|
|---|---|---|
Cause: |
Controller has detected continuous Manual Defrost Switch activity for five minutes or more. |
|
|
Component |
Keypad Power cycle the unit. |
|
Troubleshooting |
Resetting the unit may correct problem, monitor the unit. |
|
Corrective Action |
If the alarm reappears after 5 minutes replace the keypad. |
AL06 |
Keypad or Keypad Harness Fail |
|
|---|---|---|
Cause: |
Controller has detected one of the keypad keys is continuously activity. |
|
|
Component |
Keypad or Harness |
|
Troubleshooting |
Power cycle the unit. Resetting the unit may correct problem, monitor the unit. |
|
Corrective Action |
If the alarm reappears replace the keypad and harness. |
AL07 |
Fresh Air Vent Open |
|
|---|---|---|
Cause: |
The VPS is reading greater than 0 CMH while unit is in frozen mode or XtendFRESH active. |
|
|
Component |
Vent Position Sensor (VPS) |
|
Troubleshooting |
Manually reposition vent and confirm using Cd45. Refer to VENT POSITION SENSOR SERVICE Section 7.26. |
|
Corrective Action |
If unable to obtain zero reading, replace defective VPS. |
- - - - -
AL08 |
High Compressor Pressure Ratio |
|
|---|---|---|
Cause: |
Controller detects discharge pressure to suction pressure ratio is too high. The controller will attempt to correct the situation by restarting the compressor. |
|
|
Component |
Discharge Pressure Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET |
|
Corrective Action |
Replace DPT if defective. |
AL10 |
CO2 Sensor Failure |
|
|---|---|---|
Cause: |
Alarm 10 is triggered when the CO2 sensor voltage is operating outside of the 0.9 v to 4.7 v range, or if the sensor is out of range. |
|
|
Component |
This is a display alarm and has no associated failure action. |
|
Troubleshooting |
Refer to eAutoFresh manual. |
|
Corrective Action |
The alarm is triggered off when voltage is within operating range. |
AL14 |
Phase Sequence Detect Fault |
|
|---|---|---|
Cause: |
Controller is unable to determine the correct phase relationship. |
|
|
Component |
N/A |
|
Troubleshooting |
Power cycle the unit. |
|
Corrective Action |
Resetting the unit may correct problem, monitor the unit. |
|
|
|
|
Component |
Wiring |
|
Troubleshooting |
Check unit wiring. Confirm pressure readings during start-up; suction pressure should decrease and discharge pressure should increase. |
|
Corrective Action |
Correct wiring. |
|
|
|
|
Component |
Current Sensor |
|
Troubleshooting |
Check Cd41, right most digit: If display is 3 or 4 check compressor / sensor wiring. If display is 5 the current sensor is defective. |
|
Corrective Action |
Replace current sensor if defective. |
AL16 |
Compressor Current High |
|
|---|---|---|
Cause: |
Compressor current draw is over the calculated maximum for 10 minutes. |
|
|
Component |
Current Sensor |
|
Troubleshooting |
Compare Cd3 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. |
|
Corrective Action |
Replace current sensor if defective. |
|
|
|
|
Component |
Amperage is indeed too high. |
|
Troubleshooting |
Confirm supply voltage/frequency is within specification and balanced according to Electrical Data Section 3.3. |
|
Corrective Action |
Correct power supply. |
|
|
|
|
Component |
Operating Conditions |
|
Troubleshooting |
Make sure system pressures are relevant to operating conditions. |
|
Corrective Action |
Check air flow of condenser. Check Refrigerant charge, refer to REFRIGERATION SYSTEM SERVICE Section 7.3 |
|
|
|
|
Component |
Monitor Unit |
|
Troubleshooting |
Alarm is display only the alarm may clear itself during operation |
|
Corrective Action |
If alarm remains active or is repetitive replace compressor at next available opportunity, refer to COMPRESSOR Service Section 7.8. |
AL17 |
Compressor Pressure Delta Fault |
|
|---|---|---|
Cause: |
Compressor has attempted to start in both directions and fails to generate sufficient pressure differential between SPT and DPT. |
|
|
Component |
N/A |
|
Troubleshooting |
Controller will attempt restart every 20 minutes and deactivate the alarm if successful. |
|
Corrective Action |
Resume normal operation. |
|
|
|
|
Component |
Discharge Pressure Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET Section 7.2. |
|
Corrective Action |
Replace DPT if defective. |
|
|
|
|
Component |
Suction Pressure Transducer (SPT) |
|
Troubleshooting |
Confirm accurate SPT pressure readings, refer to MANIFOLD GAUGE SET Section 7.2. |
|
Corrective Action |
Replace SPT if defective. |
|
|
|
|
Component |
Monitor unit |
|
Troubleshooting |
Alarm is display only the alarm may clear itself during operation. |
|
Corrective Action |
If alarm remains active or is repetitive replace compressor at next available opportunity. |
AL18 |
Discharge Pressure High |
|
|---|---|---|
Cause: |
Discharge pressure is over the maximum for 10 minutes within the last hour. |
|
|
Component |
Restrictions in the refrigeration system. |
|
Troubleshooting |
Ensure Liquid Line Service Valve is fully open. |
|
Corrective Action |
Open Liquid Line Service Valve as needed. |
|
|
|
|
Component |
Filter Drier |
|
Troubleshooting |
Check the filter drier, if it is iced up or very cold it indicates that the filter drier needs replacement. |
|
Corrective Action |
Replace the filter drier if needed, refer to FILTER DRIER Service Section 7.12. |
|
|
|
|
Component |
Condenser Fan |
|
Troubleshooting |
Check Condenser Fan for proper operation. |
|
Corrective Action |
Correct as required. |
|
|
|
|
Component |
Discharge Pressure Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET Section 7.2. |
|
Corrective Action |
Replace DPT if defective. |
|
|
|
|
Component |
Non-condensables in the refrigeration system. |
|
Troubleshooting |
With the unit off allow system to stabilize to ambient temperature. Check system pressure against PT Chart for 134a, refer to Table 7–4. |
|
Corrective Action |
Correct as required, refer to Refrigerant Charge Section 7.7.1. |
|
|
|
|
Component |
Refrigerant |
|
Troubleshooting |
Check refrigerant level. |
|
Corrective Action |
Correct as required, refer to Refrigerant Charge Section 7.7.1. |
AL19 |
Discharge Temperature High |
|
|---|---|---|
Cause: |
Discharge temperature exceeds 135°C (275°F) for 10 minutes within the last hour. |
|
|
Component |
Restrictions in the refrigeration system. |
|
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. |
|
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 PT Chart for 134a, refer to Table 7–4. |
|
Corrective Action |
Correct as required, refer to Refrigerant Charge Table 7.7.1. |
|
|
|
|
Component |
Additional Alarms such as AL16, AL24. |
|
Troubleshooting |
Check compressor operation. |
|
Corrective Action |
If the alarm persists, it may indicate a failing compressor, replace the compressor, refer to COMPRESSOR Service Section 7.8. |
AL20 |
Control Contactor Fuse (F3) |
|
|---|---|---|
Cause: |
Control power fuse (F3A or F3B) is open. |
|
|
Component |
Check F3A, if the fuse is open: |
|
Troubleshooting |
Check PA, PB, CH coils for short to ground, if short is found: |
|
Corrective Action |
Replace the defective coil. Replace the fuse. |
|
|
|
|
Component |
Check F3B, if the fuse is open: |
|
Troubleshooting |
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: |
|
Troubleshooting |
If voltage is present, it indicates a defective microprocessor. |
|
Corrective Action |
Refer to Controller Service Section 7.24. |
AL21 |
Control Circuit Fuse (F1/F2) |
|
|---|---|---|
Cause: |
One of the 18 VAC controller fuses (F1/F2) is open. Refer to Cd08. |
|
|
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, refer to Controller Service Section 7.24. |
AL22 |
Evaporator IP |
|
|---|---|---|
Cause: |
Evaporator motor internal protector (IP) is open. |
|
|
Component |
Evaporator Motor |
|
Troubleshooting |
Shut down unit, disconnect power, & check Evaporator Motor IP at plug connection pins 4 & 6. |
|
Corrective Action |
Replace defective evaporator fan motor, refer to EVAPORATOR FAN MOTOR Service Section 7.14. |
AL23 |
Loss of Phase B |
|
|---|---|---|
Cause: |
Controller fails to detect current draw. |
|
|
Component |
Incoming Power |
|
Troubleshooting |
Check incoming power source. |
|
Corrective Action |
Correct power source as required. |
AL24 |
Compressor IP |
|
|---|---|---|
Cause: |
Compressor internal protector (IP) is open. |
|
|
Component |
Compressor |
|
Troubleshooting |
Shut down unit disconnect power, & 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, refer to COMPRESSOR Service Section 7.8. |
AL25 |
Condenser IP |
|
|---|---|---|
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, & check Condenser Fan Motor IP at plug connection pins KB5 & KB3. |
|
Corrective Action |
Replace defective condenser fan motor, refer to Condenser Fan Motor Assembly Service Section 7.11. |
AL26 |
All Sensors Failure: Supply/Return Probes |
|
|---|---|---|
Cause: |
Sensors out of range. |
|
|
Component |
All sensors detected as out of range |
|
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, refer to TEMPERATURE SENSOR Service Section 7.25. |
|
AL27 |
Analog to Digital Accuracy Failure |
|
|---|---|---|
Cause: |
Controller AD converter faulty. |
|
|
Component |
Controller |
|
Troubleshooting |
Power cycle the unit. If the alarm persists, it indicates a defective microprocessor. |
|
Corrective Action |
Replace defective microprocessor, refer to Controller Service Section 7.24. |
AL28 |
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, refer to MANIFOLD GAUGE SET Section 7.2 |
|
Corrective Action |
Replace SPT if defective |
|
|
|
|
Component |
Discharge Pressure Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET Section 7.2 |
|
Corrective Action |
Replace DPT if defective |
AL29 |
Autofresh failure |
|
|---|---|---|
Cause: |
Alarm 29 is triggered if CO2 or O2 level is outside of the limit range and the vent position is at 100% for longer than 90 minutes. |
|
|
Component |
Alarm LED will be activated and user intervention is required. |
|
Troubleshooting |
Refer to eAutoFresh manual. |
|
Corrective Action |
The alarm is triggered off when atmospheric conditions are within limit settings. |
AL50 |
Air Vent Position Sensor (VPS) |
|
|---|---|---|
Cause: |
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 sensor or the assembly. |
|
Corrective Action |
Replace VPS. |
AL51 |
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, refer to Controller Service Section 7.24 |
AL52 |
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, refer to CONTROLLER ALARMS Section 4.6. |
AL53 |
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 Cd19 (Battery Check). If alarm persists, replace the battery pack, refer to Section 7.24.6 Battery Replacement. |
AL54 |
Primary Supply Sensor (STS) |
|
|---|---|---|
Cause: |
Invalid Supply Temperature Sensor (STS) reading. |
|
|
Component |
Supply Temperature Sensor (STS) |
|
Troubleshooting |
Perform Pre-trip P5: If P5 passes, no further action is required. |
|
Corrective Action |
If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 7.25. |
AL56 |
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, refer to TEMPERATURE SENSOR Service Section 7.25. |
AL57 |
Ambient Sensor (AMBS) |
|
|---|---|---|
Cause: |
Invalid Ambient Temperature Sensor (AMBS) reading. |
|
|
Component |
Ambient Temperature Sensor (AMBS) |
|
Troubleshooting |
Test the AMBS, refer to Sensor Checkout Procedure Section 7.25.1. |
|
Corrective Action |
Replace AMBS if defective, refer to TEMPERATURE SENSOR Service Section 7.25. |
AL58 |
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; refer to Checking High Pressure Switch, Section 7.9.1. |
|
Corrective Action |
Replace HPS if defective, refer to Sensor Replacement, Section 7.25. |
|
|
|
|
Component |
Refrigeration System |
|
Troubleshooting |
Check unit for air flow restrictions. |
|
Corrective Action |
Clean or remove any debris from coils. |
AL59 |
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 set point HTT is open. |
|
Corrective Action |
Replace HTT if defective, refer to Sensor Replacement Section 7.25. |
AL60 |
Defrost Temperature Sensor (DTS) |
|
|---|---|---|
Cause: |
Failure of the Defrost Temperature Sensor (DTS) to open. |
|
|
Component |
Defrost Temperature Sensor (DTS) |
|
Troubleshooting |
Test the DTS; refer to Sensor Checkout Procedure Section 7.25.1. |
|
Corrective Action |
Replace the DTS if defective, refer to Sensor Replacement Section 7.25. |
AL61 |
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, refer to ELECTRICAL DATA Section 3.3. |
|
Corrective Action |
Replace heater(s) if defective, refer to Section 7.13.2 Evaporator Heater Removal and Replacement. |
|
|
|
|
Component |
Contactor |
|
Troubleshooting |
Check voltage at heater contactor on the heater side. If no voltage present: |
|
Corrective Action |
Replace heater contactor if defective. |
AL63 |
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. |
AL64 |
Discharge Temperature Sensor (CPDS) |
|
|---|---|---|
Cause: |
Discharge Temperature sensor out of range. |
|
|
Component |
Discharge temperature sensor (CPDS). |
|
Troubleshooting |
Test the CPDS; refer to Sensor Checkout Procedure, Section 7.25.1. |
|
Corrective Action |
Replace the CPDS if defective, refer to Sensor Replacement Section 7.25. |
AL65 |
Discharge Pressure Transducer (DPT) |
|
|---|---|---|
Cause: |
Compressor Discharge Transducer is out of range. |
|
|
Component |
Compressor Discharge Transducer (DPT) |
|
Troubleshooting |
Confirm accurate DPT pressure readings, refer to MANIFOLD GAUGE SET Section 7.2. |
|
Corrective Action |
Replace DPT if defective. |
AL66 |
(SPT) Suction Pressure Transducer, (EPT) Evaporator Pressure Transducer |
|
|---|---|---|
Cause: |
Suction Pressure Transducer (SPT) out of range. |
|
|
Component |
Suction Pressure Transducer (SPT) |
|
Troubleshooting |
Confirm accurate EPT and SPT pressure readings, refer to 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, refer to COMPRESSOR Service Section 7.8. |
AL67 |
Humidity Sensor |
|
|---|---|---|
Cause: |
Humidity Sensor (HS) reading out of range. |
|
|
Component |
Humidity Sensor (HS) |
|
Troubleshooting |
Make sure the humidity sensor is properly connected in the socket. |
|
Corrective Action |
Make sure the humidity sensor wires have not been damaged. Monitor, replace HS if alarm persists. |
AL69 |
Evaporator Temp Sensor (ETS1) |
|
|---|---|---|
Cause: |
Evaporator Temperature Sensor (ETS1) out of range. |
|
|
Component |
Evaporator Temperature Sensor (ETS1) |
|
Troubleshooting |
Test the ETS1, refer to Sensor Checkout Procedure Section 7.25.1. |
|
Corrective Action |
Replace Evaporator Temperature Sensor (ETS1) if defective. |
AL70 |
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. |
|
|
If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 7.25. |
AL71 |
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. |
|
|
If P5 fails, replace the defective sensor as determined by P5, refer to TEMPERATURE SENSOR Service Section 7.25. |
AL72 |
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 In-range. Any Pre-trip mode, resets the timers. |
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. Refer to Table 4–7.
ERR# |
Internal Microprocessor Failure |
|
|---|---|---|
Cause: |
The controller performs self-check routines. If an internal failure occurs, an “ERR” alarm will appear on the display. This is an indication the controller needs to be replaced. |
|
|
Error |
Description |
|
ERR 0-RAM failure |
Indicates that the controller working memory has failed. |
|
ERR 1-Program Memory Failure |
Indicates a problem with the controller program. |
|
ERR 2-Watchdog time-out |
The controller program has entered a mode whereby the controller program has stopped executing. |
|
ERR 3-N/A |
N/A |
|
ERR 4-N/A |
N/A |
|
ERR 5-A-D failure |
The controller’s Analog to Digital (A-D) converter has failed. |
|
ERR 6-IO Board failure |
Internal program/update failure. |
|
ERR 7-Controller failure |
Internal version/firmware incompatible. |
|
ERR 8-DataCORDER failure |
Internal DataCORDER memory failure. |
|
ERR 9-Controller failure |
Internal controller memory failure. |
|
In the event that a failure occurs and the display cannot be updated, the status LED will indicate the appropriate ERR code using Morse code as shown below. E R R 0 to 9 ERR0 = . .-. .-. ----- ERR1 = . .-. .-. . ---- ERR2 = . .-. .-. . . --- ERR3 = . .-. .-. . . . -- ERR4 = . .-. .-. . . . . - ERR5 = . .-. .-. . . . . . ERR6 = . .-. .-. -. . . . ERR7 = . .-. .-. --. . . ERR8 = . .-. .-. ---. . ERR9 = . .-. .-. ---- . |
|
Entr StPt |
Enter Set point (Press Arrow & Enter) |
|
|---|---|---|
Cause: |
The controller is prompting the operator to enter a set point. |
|
LO |
Low Main Voltage (Function Codes Cd27-38 disabled and NO alarm stored.) |
|
|---|---|---|
Cause: |
This message will be alternately displayed with the set point whenever the supply voltage is less than 75% of its proper value. |
|
OLd |
Hardware does not include a triac on the KA06 output |
|
|---|---|---|
Cause: |
ML3 controllers with configuration variable 57 set to ”3” will generate this message. This message will swap being the number one priority message with the highest priority message in the list above. |
|
4.12CONTROLLER PRE-TRIP TEST CODES
P1 Tests - Heaters Current Draw: Heater is turned on, then off. Current draw must fall within specified range. No other system components will change state during this test.
Code |
Title |
Description |
|---|---|---|
P1-0 |
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. |
P1-1 |
Heaters Turned Off |
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. |
P2 Tests - Condenser Fan Current Draw: Condenser is first verified in low speed then in high speed. 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.
Code |
Title |
Description |
|---|---|---|
P2-0 |
Condenser Fan High Speed |
Condenser fan starts in the off condition, current draw is measured, and condenser fan is then turned on. After 10 seconds the current draw is measured again. After the current is measured the Condenser fan is turned off and after 10 seconds a second off measurement is taken. Test passes if change in current draw test is in the specified range. |
P2-1 |
Condenser Fan Low Speed |
Condenser fan starts in the off condition, current draw is measured, and Condenser low speed fan is then turned on. After 10 seconds the current draw is measured again. The change in current draw is then recorded. After the current is measured the Condenser fan is turned off and after 10 seconds a second off measurement is taken. Test passes if change in current draw test is in the specified range. |
P3 Tests - Low Speed Evaporator Fan Current Draw: 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 unit 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.
.
Code |
Title |
Description |
|---|---|---|
P3-0 |
Low Speed Evaporator Fan Motors On |
High speed evaporator fans will be turned on for 20 seconds, the fans will be turned off for 4 seconds, current draw is measured, and then the low speed evaporator fans are turned on. After 60 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. |
P3-1 |
Low Speed Evaporator Fan Motors Off |
Low speed evaporator fans are 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 specified range. |
P4 Tests - High Speed Evaporator Fans Current Draw: 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 unit configured for single evaporator fan operation and either AL11 or AL12 is active at the start of either test, the test will fail immediately. If AL11 or AL12 become active during the test, the test will fail upon conclusion of the test.
Code |
Title |
Description |
|---|---|---|
P4-0 |
High Speed Evaporator Fan Motors On |
Evaporator fans start in the off condition, current draw is measured, then high speed evaporator fans will be turned on. After 60 seconds the current draw is measured again. The change in current draw is then 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. |
P4-1 |
High Speed Evaporator Fan Motors Off |
High speed evaporator fans are 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 specified range. |
P5 Tests - Air Stream Temperature Sensor Tests: Tests the validity of the Air Stream Temperature Sensors.
Code |
Title |
Description |
|---|---|---|
P5-0 |
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: |
P5-1 |
Supply Probe Test |
This test if 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: |
P5-2 |
Return Probe Test |
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. NOTE: |
P5-3 |
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. |
P5-7 |
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). |
P5-8 |
Primary Evaporator Pressure Transducer Test |
This is a Pass/Fail test of the Primary Evaporator Pressure Transducer. Test passes if suction pressure transducer (SPT) is within +/- 0 psi of saturation pressure at current evaporator temperature. Also passes if SPT is within +/- 1 psi of discharge pressure 6 hours after a power interruption. Test P5-7 must pass before this test is run. |
P5-9 |
Suction (Evaporator) Pressure Transducer Test |
Units equipped with a secondary Evaporator pressure transducer. Test passes if suction pressure transducer (SPT) is within +/- 1.5 psi of the evaporator pressure transducer (EPT). Test P5-8 must pass before this test is run. |
P5-10 |
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. |
P5-11 |
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. |
P5-12 |
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. |
P6 Tests - Refrigerant Probes, Compressor and Refrigerant Valves: Pass/Fail testing is performed for the compressor, EEV, DUV, ESV, and the refrigerant pressure and temperature sensors.
Code |
Title |
Description |
|---|---|---|
P6-0 |
Discharge Thermistor Test |
If Alarm 64 is active the test fails. Otherwise, the test passes. |
P6-1 |
Suction Thermistor Test |
If the Suction Temperature Sensor (CPSS) both is configured ON and is invalid, the test fails. Otherwise the test passes. |
P6-2 |
Discharge Pressure Transducer Test |
If Alarm 65 is active any time during the first 45 second period, the test fails. Otherwise, the test passes. |
P6-3 |
Suction Pressure Transducer Test |
If Alarm 66 is active the test fails. Otherwise the test passes. |
P6-4 |
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. |
P6-5 |
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. |
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. |
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P6-6 |
Economizer Valve Test |
Passes if suction pressure increases a minimum of 4 psia when the valve opens for 15 seconds. |
P6-7 |
Digital Loader/Unloader Valve Test |
Passes if pressure and current changes are within predetermined values 3 seconds after DLV/DUV switch signal. If it does not pass then refer to Section 7.19 |
P6-10 |
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. |
P7-0 & P8 are included with “Auto2 & Auto3” only. P9-0 through P10 are included with “Auto2” only.
P7 Tests - High Pressure Tests: Unit is run at full capacity without condenser fan running to make sure that the HPS opens and closes properly.
Code |
Title |
Description |
|---|---|---|
P7-0 |
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. |
P7-1 |
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. |
P8 Tests - Perishable Mode Tests: Pretrip tests P7-0 and P7-1 must have passed or have been skipped for these tests to execute.
Code |
Title |
Description |
|---|---|---|
P8-0 |
Perishable Mode Test |
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 18°0 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. |
P8-1 |
Perishable Mode Pull Down Test / eAutoFresh CO2 Sensor Calibration |
Control temperature must be at least 15.6°C (60°F). The set point 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 0C set point. The test passes if the container temperature reaches set point 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. |
P8-2 |
Perishable Mode Maintain Temperature Test |
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. |
P9 Test - DTT Close and Open Test: 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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Code |
Title |
Description |
|---|---|---|
P9-0 |
DTT Closed and Open Test |
P9-0 DTT Closed and Open Test 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 HTT opens when DTT is considered closed or if return air temperature rises above 248°C (120°F). Test passes if the DTT is considered open within the 2 hour heat cycle time limit. |
P10 Tests - Frozen Mode Tests:.
Code |
Title |
Description |
|---|---|---|
P10-0 |
Frozen Mode Heat Test |
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. |
P10-1 |
Frozen Mode Pulldown Test |
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. |
P10-2 |
Frozen Mode Maintain Temperature Test |
Test P10-1 must pass for this test to execute. Same as for test 8-2 except the 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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