Section 4

MICROPROCESSOR

4.1Temperature Control Microproces­sor System

The temperature control Micro-Link 3 microprocessor system (see Figure 4.1) consists of a keypad, display module, 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

Fig_Temp-Control-System.jpg 

4.1.1Keypad

The keypad (Figure 4.2) is mounted on the control box door. The keypad consists of 11 push button switches that act as the user’s interface with the controller. Descriptions of the switch functions are provided in Table 4–1.

Figure 4.2  Keypad

fig12_mv.jpg 

4.1.2Display Module

The display module (Figure 4–3) consists of five digital displays and seven indicator lights. Indicator lights include:

1.COOL − White or Blue LED: Energized when the refrigerant compressor is energized.

2.HEAT − Orange LED: Energized to indicate heater operation in heat mode, defrost mode, or dehumidification.

3.DEFROST − Orange LED: Energized when the unit is in the defrost mode.

4.IN RANGE − Green LED: Energized when the controlled temperature probe is within specified tolerance of set point.

The controlling probe in perishable range is the SUPPLY air probe and the controlling probe in frozen range is the RETURN air probe.

5.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 or humidification is enabled.

6.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 or humidification is enabled.

7.ALARM − Red LED: Energized when an active or an inactive shutdown alarm is in the alarm queue.

Table 4–1  Keypad Function

KEY

FUNCTION

CODE SELECT

Accesses function codes.

PRE TRIP

Displays the pre-trip selection menu.

Discontinues pre-trip in progress.

ALARM LIST

Displays alarm list and clears the alarm queue.

MANUAL DEFROST / INTERVAL

Displays selected defrost mode. De­pressing and holding the Defrost inter­val key for five seconds will initiate defrost using the same logic as if the optional manual defrost switch was toggled on.

ENTER

Confirms a selection or saves a

selection to the controller.

Arrow Up

Change or scroll a selection upward.

Pre-trip advance or test interruption.

Arrow Down

Change or scroll a selection down­ward. Pre-trip repeat backward

RETURN / SUPPLY

Displays non-controlling probe tem­perature (momentary display).

Celsius / Farenheit

Displays alternate English/Metric scale (momentary display). When set to de­grees Fahrenheit, pressure is dis­played in psig and vacuum in “/hg. “P” appears after the value to indicate psig and “i” appears for inches of mercury.

When set to degrees Celsius, pres­sure readings are in bars. “b” appears after the value to indicate bars.

BATTERY POWER

Initiate battery backup mode to allow set point and function code selection if AC power is not connected.

ALT MODE

This key is pressed to switch the func­tions from the temperature software to the DataCORDER Software. The re­maining keys function the same as de­scribed above except the readings or changes are made to the DataCORD­ER programming.

Figure 4.3  Display Module

fig11_mv.jpg 

4.1.3Controller

Do not remove wire harnesses from con­troller unless you are grounded to the unit frame with a static safe wrist strap.

Unplug all controller 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. Breaking the seal will void the warranty.

The Micro-Link 3 controller is a single module micro­processor as shown in Figure 4.4. It is fitted with test points, harness connectors and a software card pro­gramming port.

4.2Controller Software

The controller software is a custom designed program that is subdivided into the configuration software and the operational software. The controller software per­forms the following functions:

a.Control supply or return air temperature to required limits, provide modulated refrigeration operation, economized operation, unloaded oper­ation, electric heat control, and defrost. Defrost is performed to clear buildup of frost and ice to ensure proper air flow across the evaporator coil.

b.Provide default independent readouts of set point and supply or return air temperatures.

c.Provide ability to read, and if applicable, modify the configuration software variables, operating soft­ware function codes, and alarm code indications.

d.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.

e.Provide battery-powered ability to access or change selected codes and set points without AC power connected.

f.Provide the ability to reprogram the software through the use of a memory card.

4.2.1Configuration Software (CnF Variables)

The 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 4–4. Change to the factory−installed configuration software is achieved via a configuration card or by communications.

Figure 4.4  Control Module

fig10_mv.jpg 

1.Mounting Screw

2.Micro-Link 3 Controller

3.Connectors

4.Test Points

5.Fuses

6.Control Circuit Power Connection (located on back of controller)

7.Software Programming Port

8.Battery Pack

- - - - -

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 operation conditions and selected modes of operation.

The programming is divided into function codes. Some of the codes are read only, while the remaining codes may be user configured. The value of the user configu­rable codes can be assigned in accordance with user desired mode of operation. A list of the function codes is provided in Table 4–5.

To access the function codes:

a.Press CODE SELECT, then press an arrow key until the left window displays the desired func­tion code.

b.The right window will display the selected func­tion code value for five seconds before returning to the default display mode.

c.If additional time is required, pressing the ENTER key will extend the display time to 30 seconds.

4.3Modes of Operation

General operation sequences for cooling, heating, and defrost are provided in the following sub-paragraphs. Schematic representation of controller actions are pro­vided in Figure 4.5 & 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.

4.3.1Perishable Mode Temperature Control

The unit is capable of maintaining supply air tempera­ture to within +/- 0.25°C (+/- 0.5°F) of set point. Supply air temperature is controlled by positioning of the suc­tion modulation valve (SMV), cycling of the compres­sor, and cycling of the heaters.

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).

4.3.2Perishable Pulldown

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 5°C (9°F) above set point, the system will be in Perishable Pulldown Mode, and the SMV will open to reduce the pulldown time.

However, pressure and current limit functions may restrict the valve if either exceeds the preset limits.

4.3.3Perishable Steady State

Perishable Steady State is used to maintain the control temperature near a setpoint that is above the heat lock­out temperature.

The operational software is designed so the SMV will begin to close as the set point is reached. The SMV will continue to close and restrict refrigerant flow until the capacity of the unit and the load are balanced.

If the temperature drops below the set point, the com­pressor will remain running for a few minutes. This is to accommodate any initial undershoot which might occur. After this time has expired and the temperature is 0.2°C (0.36°F) or greater below the set point, the compressor will be turned OFF.

If the temperature drops to 0.5°C (0.9°F) below set point, the heaters will be energized. The heaters will de-energize when the temperature rises to 0.2°C (0.36°F) below the set point. The compressor will not restart until the temperature rises to 0.2°C (0.36°F) above the set point and three minutes have elapsed since the last compressor turn off.

4.3.4Perishable Idle, Air Circulation

Perishable Idle Mode is used when it is unnecessary to run the compressor to maintain control temperature. If the controller has determined that cooling is not required or the controller logic determines suction pres­sure is at the low pressure limit, the unit will transition to Perishable Idle Mode. During Perishable Idle Mode, the compressor is turned off, but the evaporator fans continue to run to circulate air throughout the container. If temperature rises +0.2°C above set point, the unit will transition back to perishable steady state.

4.3.5Perishable Heating

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.

Figure 4.5  Controller Operation - Perishable Mode

Fig_Controller-Operation-Perishable.jpg 

4.3.6Perishable Mode Dehumidification

Dehumidification is provided to reduce the humidity levels inside the container. Dehumidification is acti­vated when a humidity value is set at Cd33. The yellow SUPPLY LED will flash ON and OFF every second to indicate that dehumidification is active. Once dehumidi­fication is active and the following conditions are satis­fied, the controller will activate the heat relay to begin dehumidification.

1.The humidity sensor reading is above the humidity set point (Cd33).

2.The unit is in the perishable steady state mode, and the supply air temperature is less than 0.25°C (0.45°F) above set point.

3.The heater debounce timer (three minutes) has timed out.

4.Heater termination thermostat (HTT) is closed.

If the above conditions remain 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 4.3.7 for different evaporator fan speed options).

If any condition except for 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 SMV to match the increased heat load while still holding the supply air temperature very close to the set point.

Opening the SMV reduces the temperature of the evaporator coil surface, which increases the rate at which water is condensed 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 the dehu­midification mode is terminated by a condition other than the humidity sensor, e.g., an out-of-range or com­pressor shutdown condition, the heat relay is de-ener­gized immediately.

Two timers are activated during dehumidification to prevent rapid cycling and consequent contactor wear:

1.Heater debounce timer (three minutes) − The heater debounce timer is started whenever the heater contactor status is changed. The heat contactor remains energized (or de-energized) for at least three minutes even if the set point criteria is satisfied.

2.Out-of-range timer (five minutes) − The out-of-range timer is started to maintain heater opera­tion during a temporary out-of-range condition. If supply air temperature remains outside of the user selected in-range setting for more than five minutes, the heaters will be de-energized to allow the system to recover. The out-of-range timer starts as soon as the temperature exceeds the in-range tolerance value set by Cd30.

4.3.7Perishable, 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 the dehumidification mode 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, the user has the additional capability of selecting dehumidification set points from 60 to 95% (instead of the normal 65 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:

1.Bulb mode code Cd35 is set to “Nor.”

2.Dehumidification code Cd33 is set to “Off.”

3.The user changes the set point to one that is in the frozen range.

When bulb mode is disabled by any of the above, the evaporator fan operation for dehumidification reverts to “alt” and the DTS termination setting resets to the value determined by CnF41.

4.3.8Perishable Economy

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 achieve economy mode, a perishable set point must be selected prior to activation. When econ­omy 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.

After the initial three minutes, they will then be switched to low speed any time supply air temperature is within +/-0.25°C (0.45°F) of set point and return air tempera­ture is less than or equal to 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.

4.3.9Perishable Mode Cooling − Sequence of Operation

In Standard Perishable Mode, the evapora­tor motors run in high speed. In Economy Fan Mode, fan speed is varied.

In low temperature ambients, the condenser fan will be cycled by the controller to main­tain proper condensing pressure.

a.With supply air temperature above set point and decreasing, the unit will cooling with the con­denser fan motor (CF), compressor motor (CH), evaporator fan motors (EF) energized, and the white COOL light illuminated (see Figure 4.6).

Figure 4.6  Perishable Mode Cooling

Fig_perishable-mode-cooling.jpg 

b.When supply air temperature decreases to a predetermined tolerance above set point (Cd30), the green IN RANGE light is illuminated.

c.As the air temperature continues to fall, modu­lating cooling starts as the supply air tempera­ture approaches set point.

d.The controller continuously monitors supply air temperature. Once the supply air temperature falls below set point and 0% SMV position is reached, the controller periodically records the 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.

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 is within tolerance of set point.

f.When the supply air temperature increases to 0.2°C (0.36°F) above set point and the three minute off time has elapsed, relays TC and TN are energized to restart the compressor and condenser fan motor. The white COOL light is also illuminated.

4.3.10Perishable Mode Heating − Sequence of Operation

The unit will heat only when in the Perish­able Mode, relay TH is electronically locked out when in the Frozen Mode.

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 temperature rises to 0.2°C (0.36°F) below set point, contact TH opens to de-energize the heaters. The 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

Fig_perishable-mode-heating.jpg 

4.3.11Frozen 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.

With CnF26 (Heat Lockout Temperature) is set to -10°C, frozen mode is active with set points at or below -10°C (+14°F). With CnF26 set to -5°C, frozen mode is active at or 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.

When return air temperature is greater than 0.2°C (0.36°F) above the frozen set point and the three min­ute time delay has been met, the unit will always oper­ate at full capacity with the suction modulation valve open as allowed by current and pressure limiting.

4.3.12Frozen Steady State

Frozen range cargoes are not sensitive to minor tem­perature changes. The method of temperature control employed in frozen range takes advantage of this fact to greatly improve the energy efficiency of the unit. Temperature control in frozen range is accomplished by cycling the compressor on and off as the load demand requires.

The unit will operate in the conventional frozen mode when the controller set point is at or below the frozen range and Economy Mode (Cd34) is set to “OFF.”

Figure 4.8  Controller Operation - Frozen Mode

Fig_controller-operation-frozen.jpg 

4.3.13Frozen Idle Mode

When temperature drops to set point minus 0.2°C (0.36°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, (0.36°F) the unit will transition back to the frozen steady state mode.

On start up of the unit, SMV will reset to a known open position. This is accomplished by assuming the valve was fully open, driv­ing it fully closed, resetting the percentage open to zero, then opening to a known 21% staging position.

To prevent rapid cycling of the compressor, a three minute compressor off time must be satisfied before the compressor will restart. Under a condition of rapidly changing return air temperature, the time delay may allow the return air temperature to rise slightly above set point temperature before the compressor can restart.

4.3.14Frozen “Heat” 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.

4.3.15Frozen Economy Mode

In order to activate economy frozen mode operation, 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 (3.6°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 (0.36°F), the unit will restart the refrigeration system and continue to cool until the previously men­tioned off-cycle temperature criteria are met. If the con­trol temperature is less than the frozen set point +0.2°C (0.36°F), the unit will turn off the evaporator fans and restart another 60 minute off-cycle.

4.3.16Frozen Mode Cooling − Sequence of Operation

NOTES

1.In the Frozen Mode the evaporator motors run in low speed.

2.In low temperature ambients, the con­denser fan will be cycled by the control­ler to maintain proper condensing pressure, refer to Section 4.4.4.

a.When the return air temperature is above set point and decreasing, the unit will be cooling with the condenser fan motor (CF), compressor motor (CH), 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 (0.36°F) below set point, contacts TC and TN are opened to de-energize the compressor and condenser fan motors. The white COOL light is also de-energized.

d.The evaporator fan motors continue to run in low speed to circulate air throughout the container.

e.The green IN-RANGE light remains illuminated as long as the return air is within tolerance of set point.

f.When the return air temperature increases to 0.2°C (0.36°F) above set point and the three minute off time has elapsed, relays TC and TN are energized to restart the compressor and condenser fan motors. The white COOL light is also illuminated.

Figure 4.9  Frozen Mode

Fig_frozen-mode.jpg 

4.3.17Defrost

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.

Defosting the coil consists of removing power to the cooling components (compressor, evaporator fans, and condenser fan), closing the SMV, 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 a 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 5.7.

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.

4.3.18Defrost Operation

Initiation of defrost is dependent on the state of the Defrost Temperature Sensor (DTS). When the (DTS) senses a temperature less than 10°C (50°F) the defrost options become active and the timer is engaged for the initiation of the defrost cycle. The defrost time accumu­lates when the compressor is running. In the perishable mode this is the same as real time as the compressor in general runs continuously. In frozen mode the actual time necessary to count down to the next defrost will exceed the defrost interval depending on the compres­sor duty-cycle.

When the defrost mode is in the active state, defrost can be initiated when any one of the following addi­tional conditions become true:

1.Manually: 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 3-5).

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.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 it 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 SMV, 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.

Figure 4.10  Defrost

Fig_defrost.jpg 

The SMV is independently operated by the microprocessor. Complete schemat­ics and legends are located in Section 8.1.

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.

4.3.19Defrost Related Settings

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

4.4.1Evaporator Fan Operation

Opening of an evaporator fan internal protector will shut down a unit. (CnF32 set to 2EFO).

4.4.2Failure Action

Function code Cd29, Failure Action Mode, may be opera­tor set to allow continued operation in the event the con­trol sensors are reading out of range. The factory default is full system shutdown (refer to Table 4–5).

4.4.3Generator Protection

Function codes Cd31, Stagger Start Offset Time, and Cd32, System Current Limit, may be operator set to con­trol start-up sequence of multiple units and operating cur­rent draw. The factory default allows on demand starting of units and full current draw (refer to Table 4–5).

4.4.4Condenser Pressure Control

When configuration variable CnF14 is set to “In,” the condenser pressure control logic is activated to maintain discharge pressures above 130psig in low temperature ambients. The logic turns the condenser fan on or off in accordance with the condenser pressure transducer reading (refer to Table 4–4) The function is enabled when the following conditions are met:

1.The ambient sensor reading is less than or equal to 27°C (80°F), and

2.Voltage/Frequency ratio is less than or equal to 8.38.

When the above conditions are met, either pressures or timers may dictate a change of state from OFF to ON or ON to OFF. If the condenser fan is OFF, it will be energized if saturated condensing pressure is greater than 200psig OR if the condenser fan has been OFF for a variable time period of up to 60 seconds depend­ing on the ambient temperature. As the ambient tem­perature increases, the amount of time that the condenser fan is energized will correspondingly increase towards the maximum.

If the condenser fan is ON, it will de-energize only if the saturated condensing pressure is less than 130psig and the condenser fan has been running for a minimum of thirty seconds depending on the ambient temperature.

4.5Quest − CCPC

Compressor−Cycle Perishable Cooling (CCPC) is a method of temperature control 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 as 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.

4.6Controller Alarms

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.

An alarm is indicated by flashing an alarm code on the display panel, and for some alarms, by the alarm light illuminating.

When an Alarm Occurs:

a.The red alarm light will illuminate for “20 series” alarms.

b.If a detectable problem is found to exist, 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:

a.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.

b.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.

c.The left display will show “AL##,” where ## is the alarm number sequentially in the queue.

d.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.

e.“END” is displayed to indicate the end of the alarm list if any alarms are active.

f.“CLEAr” is displayed if all alarms are inactive. The alarm queue may than 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 pretrip test (P5) to clear AL26.

4.7Pre−Trip Diagnostics

Pre-trip diagnostics is an independent controller function that will suspend normal refrigeration controller activities and provide preprogrammed test routines. The test rou­tines include Auto Mode testing, which automatically per­forms a pre−programmed sequence of tests or Manual Mode testing, which allows the operator to select and run any of the individual tests.

Pre-trip inspection should not be per­formed with critical temperature cargoes in the container.

When Pre-Trip key is pressed, dehumidi­fication and bulb mode will be deacti­vated. At the completion of Pre-Trip activity, 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 all subtests. The results will be displayed as “PASS” or “FAIL” for all the tests run to completion.

A detailed description of the pre-trip tests and test codes is provided in Table 4–7. Detailed operating instructions are provided in Section 5.7.

4.8DataCORDER

The 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). A personal computer with Carrier Transicold DataLINE software may also be used to download data and configure settings.

The resulting file uses a proprietary file format that pro­tects it from potential tampering or altering of data. Therefore, once downloaded, all dcx files shall be con­sidered secured. The DataCORDER consists of:

The DataCORDER consists of:

•Configuration Software

•Operational Software

•Data Storage Memory

•Real Time Clock (with internal battery backup)

•Six Thermistor Inputs

•Interrogation Connections

•Power Supply (battery pack)

The DataCORDER performs the following functions:

a.Logs data at 15, 30, 60 or 120 minute intervals and stores two years’ of data (based on one hour interval).

b.Records and displays alarms on the display module.

c.Records results of Pre-trip testing.

d.Records DataCORDER and temperature control software generated data and events as follows:

•Container ID Change

•Software Upgrades

•Alarm Activity

•Battery Low (Battery Pack)

•Data Retrieval

•Defrost Start and End

•Dehumidification Start and End

•Power Loss (with and without battery pack)

•Power Up (with and without battery pack)

•Remote Probe Temperatures in the Con­tainer USDA cold treatment and cargo probe recording)

•Return Air Temperature

•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

4.8.1DataCORDER Software

The DataCORDER Software is subdivided into Opera­tional Software, Configuration Software, and the Data Memory.

a. Operational Software (dC Function Codes)

The Operational Software reads and interprets inputs for use by the Configuration Software. The inputs are labeled Function Codes. Controller function codes (see Table 4–8), allow the operator 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 time is desired, press the ENTER key to extend the time to 30 seconds.

b. Configuration Software

The configuration software controls the recording and alarm functions of the DataCORDER. Reprogramming to the factory-installed configuration is achieved via a configuration card. Changes to the software may be made using the DataLINE integration software.

A list of the configuration variables is provided in Table 4–2. Descriptions of DataCORDER operation for each vari­able setting are provided in the following paragraphs.

4.8.2Sensor Configuration (dCF02)

Two modes of operation may be configured, the Standard Mode and the Generic Mode.

a. Standard Mode

In the 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 six thermistor inputs (supply, return, USDA #1, #2, #3, and cargo probe) and the humidity sensor input will be generated by the DataCORDER. An example of a report using a standard configuration is shown in Figure 4.11.

The DataCORDER software uses the supply and return recorder sensors. The tempera­ture control software uses the supply and return temperature sensors.

b. Generic Mode

The generic recording mode allows user selection of the network data points to be recorded. The user may select up to a total of eight data points for recording. A list of the 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.Suction modulation valve percentage

10.Discrete outputs (See Note )

11.Discrete inputs (See Note )

12.Ambient sensor

13.Compressor suction sensor

14.Compressor discharge sensor

15.Return temperature sensor

16.Supply temperature sensor

17.Defrost temperature sensor

18.Discharge pressure transducer

19.Suction pressure transducer

20.Condenser pressure transducer

4.8.3Logging Interval (dCF03)

The user may configure four 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.

4.8.4Thermistor Format (dCF04)

The user may configure the format in which the thermistor readings are recorded. The low resolution is a 1 byte for­mat and the normal resolution is a 2 byte format. The low resolution requires less memory and records temperature in 0.25°C (0.45°F) increments when in perishable mode or 0.5°C (0.9°F) increments when in the frozen mode. The normal resolution records temperature in 0.01°C (0.02°F) increments for the entire range.

Table 4–2  Data CORDER Configuration Variables

CONFIG

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

Low, Normal

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

Auto, On, Off

Figure 4.11  Standard Configuration Report

fig133_uv.jpg 

Table 4–3  Data CORDER Standard Configurations

Standard

Config.

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)

4.8.5Sampling 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, the supply and return temperature readings are averaged and the three USDA probe readings are snapshot.

4.8.6Alarm Configuration (dCF07 − dCF10)

The USDA and cargo probe alarms may be configured to OFF, ON or AUTO.

If a probe alarm is configured to OFF, then the alarm for this probe is always disabled.

If a probe alarm is configured to ON, then 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 their 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, then all of the alarms are enabled and the remaining probes that are not installed will give active alarm indications.

The DataCORDER will record the initiation of a pre-trip test (refer to Section 4.7) and the results of each of the tests included in pre-trip. The data is time-stamped and may be extracted via the Data Retrieval program. Refer to Table 4–9 for a description of the data stored in the DataCORDER for each corresponding pre-trip test.

4.8.7DataCORDER Power-Up

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, the battery pack needs replacement.

4.8.8Pre-trip Data Recording

The DataCORDER will record the initiation of a Pre-trip test (refer to Section 4.7) and the results of each of the tests included in pre-trip. The data is time-stamped and may be extracted via the Data Retrieval program. Refer to Table 4–9 for a description of the data stored in the DataCORDER for each corresponding pre-trip test.

4.8.9DataCORDER 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.

Communication 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.

c. 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.

b. 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 remote monitoring unit 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.

4.8.10USDA Cold Treatment

Sustained cold temperature has been employed as an effective post harvest 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 setpoint and record minute changes in product temperature within the DataCORDER memory, thus meeting USDA criteria. Information on USDA is pro­vided in the following subparagraphs

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 three-pin receptacles are for the probes and fifth, five-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 is incorporated which allows the user to enter a USDA (or other) message at the head of a data report. The maximum message length is 78 char­acters. Only one message will be recorded per day.

4.8.11USDA 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 fruit (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.”

4.8.12DataCORDER Alarms

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 signals back 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 4–10. Refer to Section 4.8.6 for con­figuration information.

To display alarm codes:

a.While in the Default Display mode, press the ALT. MODE & ALARM LIST keys. This accesses the DataCORDER Alarm List Display Mode, which displays any alarms stored in the Alarm Queue.

b.To scroll to the end of the alarm list, press the UP ARROW. Depressing the DOWN ARROW key will scroll the list backward.

c.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

d.“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.

e.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.

4.8.13ISO Trip Header

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

Table 4–4  Controller Configuration Variables

CONFIG

TITLE

DEFAULT

OPTION

CnF01

Bypass Valve Enable

In

0-in, 1-out

CnF02

Evaporator Fan Speed

dS (Dual)

0-single, 1-dual

CnF03

Control Sensors

FOUr (quad)

0-duAL, 1-quad

CnF04

De- humidification Mode

On

0-on, 1-off

CnF07

Unit Selection, 20FT / 40FT / 45FT

40ft

0-40ft, 1-20ft, 2- 45ft

CnF08

Single Phase/Three Phase Motor

1Ph

0-1phe, 1-3phe

CnF10

Two Speed Compressor Logic

Out (Single)

0-single, 1-dual

CnF11

Defrost Off Selection

noOFF

0-noOFF, 1-OFF

CnF12

TXV / Solenoid Quench Valve

Out (TXV)

0-quench, 1-TXV

CnF13

Unloader

Out

0-in, 1-out

CnF14

Condenser Pressure Control (CPC)

In

0-in, 1-out

CnF15

Discharge Temperature Sensor

Out

0-in, 1-out

CnF16

DataCORDER Present

On (Yes)

0-off, 1-on

CnF17

Discharge Pressure Sensor

Out (No)

0-out (No), 1-in (Yes)

CnF18

Heater

Old (Low Watt)

0-old, 1-new (High Watt)

CnF19

Controlled Atmosphere

Out (No)

0-out, 1-in (Yes)

CnF20

Suction Pressure Sensor

Out (No)

0-out, 1-in (Yes)

CnF21

Autotransformer

Out

0-out, 1-in

CnF22

Economy Mode Option

OFF

0-off, 1-full, 2-std, 3-cust

CnF23

Defrost Interval Timer Save Option

noSAv

0-no_sav, 1-sav

CnF24

Enable Long PreTrip Test Series

Auto1

0-auto1, 1-auto2, 3-aAuto3

CnF25

Enable PreTrip Data Recording

rSLtS

0-rSLts, 1-dAtA

CnF26

Heat Lockout Change Option

Set to 10°C

0= 10°C, 1= 5°C

CnF27

Suction Temperature Display Option

Out

0-out, 1-in

CnF28

Enable Bulb Mode Option

NOr

0-normal, 1-bulb

CnF29

Enable Arctic Mode

Out

0-out, 1-in

CnF30

Compressor Size

41cfm

0-41cfm, 1-37cfm

CnF31

Probe Check Option

SPEC

0-Std, 1-Special

CnF32

Enable Single Evaporator Fan Option

2EF0 (dual)

0-dual, 1-single_enable

CnF33

Enable Snap Freeze Option

OFF

0-off, 1-snap

CnF34

Temperature Unit Display

bOth (C&F)

0-enable both, 1-F, 2-C

CnF35

Enable Humidification Mode

0-OFF

1-on

CnF36

SMV Type

PWM

0-PWM, 1-Spor, 2-Alco

CnF37

Electronic Temperature Recorder

rEtUR

0-return, 1-supp, 2-both

CnF38

Quench Bypass Valve

0-Out

1-in

CnF39

Expanded Current Limit Range

0-Out

1-in

CnF40

Demand Defrost

0-Out

1-in

CnF41

Lower DTT Setting

0-Out

1-in

CnF42

Enable Auto Pretrip Start

0-Out

1-in

CnF43

Pulldown Defrost

0-Out

1-in

CnF44

Autoslide Enabled

0-Out

1-Lo, 2-Up

CnF45

Low Humidity Enabled

0-Out

1-in

CnF47

Fresh Air Vent Position Sensor

0-Out

1-up, 2-low, 3-cust

CnF48

CFS / WPS Override

0-Out

1-in

CnF49

OEM Reset Option

0-Off

1-std, 2-spec, 3-cust

CnF50

Enhanced Bulb Mode Selection

0-Out

1-in

CnF51

Timed Defrost Disable

0-Out

1-in

CnF54

Remote Evaporator

0-Out

1-in

CnF60

Compressor Cycle Perishable Cooling

0-Out

1-in

CnF61

ACT ASC Control Enable

0-Out

1-in

CnF62

Extended Temperature Control Enable

0-Out

1-in

CnF63

CCPC Pre-trip / Tripstart Default State

0-On

1-off

CnF64

Evaporator Fan Pulsing Logic Enable

0-In

1-out

CnF66

High Speed Evaporator Fan Option

0-off

1-on

CnF67

Air Heaters

0-out

1-in

CnF68

Enable Default Pulsing Temperature

0-out

1-in

CnF69

PrimeLine AL15 Enable And Failure Action C Lockout

0-out

1-in

CnF70

Enable XtendFRESH Logic

0-out

1-in

CnF71

XtendFRESH Pre-Trip / Trip Start Default State

0-off

1-on

CnF72

FuelWise

0-off

1-df_off, 2-df_on

Note: Configuration numbers not listed are not used in this application. These items may appear when loading configuration software to the controller but changes will not be recognized by the controller programming.

4.10Controller Function Codes

Table 4–5  Controller Function Codes

CODE

TITLE

DESCRIPTION

Note: If the function is not applicable, the display will read “-----”

Display Only Functions − Cd01 through Cd26 are display only functions.

Cd01

Suction Modulation Valve (SMV) Opening (%)

Displays the SMV percent open. The right display reads 100% when the valve is fully open and 0% when the valve is fully closed. The valve will usually be at 21% on start up of the unit except in very high ambient temperatures.

Cd02

Quench Valve State

Displays the state of the solenoid quench valve, open or closed.

Cd03

Suction Solenoid Valve State

Displays the state of the suction solenoid valve, open or closed.

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 pretrip 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 dis played will be halved if either fuse F1 or F2 is bad (see alarm code AL21).

Cd09

Ambient Air Temperature

The Ambient Temperature Sensor reading is displayed.

Cd10

Compressor Suction Temperature

The Compressor Suction Temperature Sensor reading is displayed.

Cd11

Compressor Discharge Temperature

The Compressor Discharge Temperature Sensor reading is displayed.

Cd12

Compressor Suction Port Pressure

The Compressor Suction Pressure Transducer reading is displayed.

Cd13

Condenser Pressure Control (CPC) Sensor

The Condenser Pressure Control Sensor reading is displayed.

Cd14

Compressor Discharge Pressure

The Compressor Discharge Pressure Transducer reading is displayed.

Cd15

Unloader Valve (On-Off)

Not used in this application

Cd16

Compressor Motor Hour Meter / Switch On Time

Records total hours of compressor run time. Total hours are recorded in incre­ments of 10 hours (i.e., 3000 hours is displayed as 300).

/ Press 'Enter' to display Start Switch 'ON' time.

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 con figured (i.e., if the unit is a 69NT40541100, the display will show 41100). 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 rep resents the publication date of the model configuration database.

Cd21

ML3 - Humidity Water Pump/Air Pump Status

This code displays the status of the humidity water pump (-----, On, or OFF). If not configured, the mode is permanently deactivated and will display -----.

Cd22

Compressor State

The status of the compressor is displayed (high, low or off).

Cd23

Evaporator Fan State

Displays the current evaporator fan state (high, low or off).

Cd24

Controlled Atmosphere State

Displays the controlled atmosphere state (-----, On or Off).

Cd25

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 (DTS) reading is displayed.

Configurable Functions

Configurable Functions − Cd27 through Cd37 are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container.

Cd27

Defrost Interval (Hours or Automatic)

There are two modes for defrost initiation, either user-selected timed intervals or automatic control. The user-selected values are (OFF), 3, 6, 9, 12, 24 hours, AU­TO, or PuLS. Factory default is 3 hours.

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 startup or after termination of a defrost, the time will not begin counting down until the defrost temperature sensor (DTS) reading falls below set point. If the reading of DTS rises above set point any time during the timer count down, the interval is reset and the countdown begins over.

If the DTS fails, alarm code AL60 is activated and control switches over to the re­turn temperature sensor. The controller will act in the same manner as with the DTS except the return temperature sensor reading will be used.

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.

NOTE

The defrost interval timer counts only during compressor run time.

Configuration variable (CnF11) determines whether the operator will be allowed to chose OFF as a defrost interval option.

Configuration variable (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) con fig­uration 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) which 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

This is the desired action to be taken if an alarm occurs that severely limits the ca­pability of the control system. Depending upon what alarm has occurred, the actual action taken may not be the same as the desired failure action.

The user selects one of four possible actions as follows:

A - Full Cooling (stepper motor SMV at maximum allowed opening)

B - Partial Cooling (stepper motor SMV 11% open)

C - Evaporator Fan Only

D - Full System Shutdown - Factory Default

Cd30

In-Range Tolerance

The in-range tolerance will determine the band of temperatures 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 INRANGE 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 startup, 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

System 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. This is ac­complished by reducing the SMV position until current draw is reduced to the set point. When desirable, the limit can be lowered; however, capacity is also reduced. The five values for 460VAC operation are 15, 17, 19, 21 (Factory Default), 23.

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 if CnF50, Enhanced Bulb Mode, is active.)

Cd34

Economy Mode

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 dis played (indicating that the evaporator fans will alternate their speed) and the dis play 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 (DTT) 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 if CnF50, Enhanced Bulb Mode, is active.)

Display Only Functions - Cd38 through Cd40 are display only functions.

Cd38

Secondary Supply Temperature Sensor

Code 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

Code 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 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.

Code 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.

Service Function - Cd41 is used for troubleshooting.

Cd41

Valve Override

This code allows manual positioning of the SMV. Refer to paragraph 6.18 for op­erating instructions.

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.

Cd43

AutoFresh Mode

Cd43 is a user selectable mode of operation that allows opening and closing of a mechanical air vent door via a stepper motor. 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 ----

Display Only Function - Cd44 is a display only function.

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)

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.

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 +/- 0.25°C of the setpoint and the return tempera­ture is less than or equal to the supply temperature + the user selected Cd47 (val­ues are 0.5 °C - 4.0° C, default is 3.0 °C).

Cd48

De- humidification / 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 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.

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.

Cd49

Days Since Last Successful Pretrip

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.

Cd50

CCPC Enable / Disable

"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 (ACT) Mode 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 0.0°C

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 10.0°C   

Initially Cd51 will display current countdown timer increments of (1 day)_(1hr), de fault 0_0

Pressing ENTER key will take the interface down into a hierarchy of parameter se­lection menus in the order listed above. 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 dis play 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 pretrip test or Trip Start is initiated, act-mode goes to OFF.

Cd53

Automatic Set point Change (ASC) 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 10.0°C

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 10.0°C

Initially displays 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 in the order listed above. 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 dis play 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 - Cd55 through Cd58 are display only functions.

Cd55

Discharge Superheat

Cd55 will display the discharge superheat 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.

Configurable Functions - Cd60 is a user-selectable function. The operator can change the value of this function to meet the operational needs of the container.

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

Dashed-out if setpoint is in frozen range OR if Cnf66 is configured OFF.

This function code 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.

Default is OFF.

Figure 4.12  Alarm Troubleshooting Sequence

Fig_Alarm-TS-Sequence.jpg 

4.11Controller Alarm Indications

AL05

Manual Defrost Switch Failure

Cause:

Controller has detected continuous Manual Defrost Switch activity for five minutes or more.

 

Component

Keypad

 

Troubleshooting

Power cycle the unit.

 

Corrective Action

Resetting the unit may correct problem, monitor the unit.

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.

 

Corrective Action

Resetting the unit may correct problem, monitor the unit.

If the alarm reappears replace the keypad and harness.

AL07

Fresh Air Vent Open with Frozen Set Point

Cause:

The VPS is reading greater than 0 CMH while unit is in frozen mode.

 

Component

Vent Position Sensor (VPS)

 

Troubleshooting

Manually reposition vent and confirm using Cd45. Refer to VENT POSI­TION SENSOR SERVICE Section 7.22.

 

Corrective Action

If unable to obtain zero reading, replace defective VPS.

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.

AL11

Evaporator Fan 1 IP

Cause:

Alarm 11 is triggered when configured for single evap operation and MC6 sensed high.

 

Component

Evaporator Fan 1

 

Troubleshooting

The unit will suspend probe check diagnostic logic and disable the probe check portion of defrost cycle.

 

Corrective Action

AL11 is triggered off when MC6 sensed low.

AL12

Evaporator Fan 2 IP

Cause:

Alarm 12 is triggered when configured for single evap operation and KB10 sensed high.

 

Component

Evaporator Fan 2

 

Troubleshooting

The unit will suspend probe check diagnostic logic and disable the probe check portion of defrost cycle.

 

Corrective Action

AL11 is triggered off when KB10 sensed low.

AL15

Loss of Cooling

Cause:

AL15 is triggered 30 minutes after the completion of a controller initiated probe check defrost if Supply Temperature is more than 0.25°C (0.45°F) above set point. Refer to Section 4.3.17.

 

Component

Refrigerant Level

 

Troubleshooting

Power cycle the unit.

 

Corrective Action

Refer to Refrigerant Charge, Section 7.7

Power cycle the unit.

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 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 the output of F3A and F3B:

 

Troubleshooting

If voltage is present at both F3A and F3B, it indicates a defective micropro­cessor.

 

Corrective Action

Refer to Controller Service Section 7.20.

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 7.20.

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 1 & 2.

 

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 7.21.

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 7.20.

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.

 

 

 

Component

Vent Position Sensor (VPS)

 

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), AL51 will be reset.

 

 

 

Component

Controller

 

Troubleshooting

Power cycle the unit. If the alarm persists, it indicates defective controller memory.

 

Corrective Action

Replace defective controller, refer to Controller Service Section 7.20.

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 Table 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 7.20.5 Battery Replacement.

AL54

Primary Supply Sensor (STS)

Cause:

Invalid Supply Temperature Sensor (STS) reading.

 

Component

Supply Temperature Sensor (STS)

 

Troubleshooting

Perform Pre-trip P5:

 

Corrective Action

If P5 passes, no further action is required.

If P5 fails, replace the defective sensor as determined by P5, refer to TEM­PERATURE SENSOR Service Section 7.21.

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 7.21.

AL57

Ambient Sensor (AMBS)

Cause:

Invalid Ambient Temperature Sensor (AMBS) reading.

 

Component

Ambient Temperature Sensor (AMBS)

 

Troubleshooting

Test the AMBS, refer to TEMPERATURE SENSOR Service Section 7.21.

 

Corrective Action

Replace AMBS if defective, refer to TEMPERATURE SENSOR Service Section 7.21.

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 High Pressure Switch, Section 7.9.

 

Corrective Action

Replace HPS if defective, refer to High Pressure Switch, Section 7.9.

 

 

 

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

Alarm 59 is triggered by the opening of the Heat Termination Thermostat (HTT) and will result in the disabling of the heater.

 

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.

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 7.21.1.

 

Corrective Action

Replace the DTS if defective, refer to Sensor Replacement Section 7.21.2.

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 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 contact or 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.

 

 

 

Component

Refrigeration System

 

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 Temperature Sensor Service Section 7.21.

 

Corrective Action

Replace the CPDS if defective, refer to Temperature Sensor Service Sec­tion 7.21.

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

AL68

CPC Pressure Sensor (PS3)

Cause:

Condenser Pressure Transducer (CPC) out of range.

 

Component

Condenser Pressure Transducer (CPC)

 

Troubleshooting

NA

 

Corrective Action

Unit will disable Con denser Pressure Control if Configured.

AL69

Suction Temp Sensor (CPSS)

Cause:

Suction Temperature Sensor (CPSS) out of range.

 

Component

Suction Temperature Sensor (CPSS)

 

Troubleshooting

Test the CPSS, refer to Temperature Sensor Service Section 7.21.

 

Corrective Action

Replace CPSS if defective, refer to Temperature Sensor Service Section 7.21.

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 7.21.

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 7.21.

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, re sets the timers
Table 4–6  Controller Alarm Indications

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 4–10.

ERR #

Internal Microprocessor Failure

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 re placed.

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)

The controller is prompting the operator to enter a set point.

LO

Low Main Voltage (Function Codes Cd27-38 disabled and NO alarm stored.)

This message will be alternately displayed with the set point whenever the sup­ply voltage is less than 75% of its proper value.

4.12Controller Pre-Trip Test Codes

Table 4–7  Controller Pre-Trip Test Codes

Auto or Auto1 menu includes the: P, P1, P2, P3, P4, P5, P6 and rSLts. Auto2 menu includes P, P1, P2, P3, P4, P5, P6, P7, P8, P9, P10 and rSLts.Auto3 menu includes P, P1, P2, P3, P4, P5, P6, P7, P8 and rSLts

P0-0

PreTrip Initiated: Configuration Display, Indicator Lamps, LEDs, and Displays

Container identifier code, Cd18 Software Revision Number, Cd20 Container Unit Model Number, & configuration database identifier CFMMYYDD are displayed in sequence.

Next the unit will indicate the presence or non-presence of an RMU according to whether any RMU inquiry messages have been received since the unit was booted.

Units equipped with Autoslide Enabled (Cnf44) will cause the vent to seek to its closed position, followed by two sequences of opening to 100% and returning to the closed position. No other Autoslide mode of operation will be available until the two cycles of opening and closing have completed.

Since the system cannot recognize lights and display failures, there are no test codes or results associated with this phase of Pretrip. To know if the test passes the operator must observe that the LCD display elements and the indicator lights behave as described below.

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.

P1-0

Heaters On Test

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 Off Test

Heater is then turned off. After 10 seconds the current draw is measured. The change in current draw is then recorded.

Test passes if change in current draw is in the range specified.

P2 Tests - Condenser Fan Current Draw: Condenser fan is turned on, then off. Current draw must fall within specified range. No other system components will change state during this test.

P2-0

Condenser Fan On Test

Condenser fan starts in the off condition, current draw is measured, and con dens­er fan is then turned on. After 15 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.

P2-1

Condenser Fan Off Test

Condenser fan is then turned off. After 10 seconds the current draw is measured. The change in current draw is then recorded.

Test passes if change in current draw test is in the 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.

P3-0

Low Speed Evaporator Fans On Test

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 Off Test

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.

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 cur rent 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.

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

If this test fails, P50 and FAIL will be displayed. If both Probe tests (this test and the PRIMARY / SECONDARY) pass, the display will read P5 PASS.

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

If this test fails, P51 and FAIL will be displayed. If both Probe tests (this and the SUPPLY/ RETURN TEST) pass, because of the multiple tests, the display will read 'P 5' 'PASS'.

P5-2

Return Probe Test

For units equipped with secondary return probe only.

The temperature difference between primary return probe and secondary return probe is compared.

Test passes if temperature comparison falls within the specified range.

NOTES

1.If this test fails, P52 and FAIL will be displayed. If both Probe tests (this test and the SUPPLY/ RETURN) pass, because of the multiple tests, the display will read P 5, PASS.

2.The results of PreTrip tests 50, 51 and 52 will be used to activate or clear control probe alarms.

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 sup ply and primary return probes.

After 60 seconds this test is forced to PASS irrespective of differential change in primary supply temperature and primary return temperature.

Test P5-0 must pass before this test is run.

P5-4 - P5-9

Not Applicable

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. Unit must be configured with a Humidity Sensor for 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 - Compressor and Refrigerant Valves: This section of testing deals with the Compressor and the two Compressor valves: Suction Modulation Valve and Quench Valve.

P6-0

Compressor On

A current draw test is performed before the compressor is started. The compres­sor is started, the SMV is opened, and another current draw test is performed.

Test Passes if the change in compressor current draw is within the specified range.

P6-1, P6-H, P6-L

Not Applicable

These tests are not run for Single Speed Compressors.

P6-2

Suction Modulation Valve (Open and Closed)

The compressor and fans continue to run from the previous test. The quench valve (if configured) will operate as in normal control mode. The SMV is closed to 0% open, current and condenser pressure readings are taken. The SMV is opened to 50% with continuous current and condenser pressure readings taken to establish maximum values. The SMV is returned to 0% open and final readings are taken.

Test passes if the calculated difference in current at the 50% open position are above a specified value before and after opening of the SMV, OR the calculated difference in condenser pressure at the 50% open position are above a specified value before and after opening of the SMV.

P6-3

Quench Valve Test

To run this test, the system must be equipped with a solenoid quench valve as de­termined by CnF12, (TXV/Solenoid Quench Valve), and ambient temperature must be greater than -12°C.

Compressor suction temperature is measured with the Quench valve closed, the Quench valve is energized and the suction temperature drop is checked.

Test passes if suction temperature is within the valid range.

P6-4

Not Applicable

This test is not run for units configured with a stepper type SMV.

P6-5

Not Applicable

This test is not run, units with stepper type SMVs are not configured with a by pass valve.

P6-6

Not Applicable

This test is only run on systems that have an Unloader as indicated by CnF13 (Un­loader).

P70 & P8 are included with the Auto2 & Auto 3 only. P90 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.

P7-0

High Pressure Switch Closed

With the unit running, the condenser fan is de-energized, and a 15 minute timer is started. The right display shows discharge pressure if the unit is equipped with a discharge pressure transducer (DPT). If no DPT is installed, the condenser pres­sure transducer (CPT) reading will be displayed.

Test is skipped if:

Sensed ambient temperature is less than 7°C (45°F)

Return air temperature is less than 17.8°C (0°F)

The water pressure switch (WP) is open, indicating that the unit is operat­ing with a water-cooled condenser

Test is skipped if the unit does NOT have:

A compressor discharge sensor (CPDS)

A discharge pressure transducer (DPT)

A condenser pressure transducer (CPT)

Test passes if the HPS opens within 15 minutes.

Test immediately fails if the following inputs are sensed to be invalid:

Compressor discharge sensor (CPDS)

Discharge pressure transducer (DPT)

Condenser pressure transducer (CPT)

Return temperature sensor (RTS)

Ambient sensor (AMBS)

Test will also fail if:

HPS fails to open within 15 minutes

Discharge temperature exceeds 138°C (280°F)

Discharge temperature is less than or equal to ambient temperature plus 5°C (9°F)

CPT or DPT pressure exceeds 27.42kg/cm2 (390psig)

P7-1

High Pressure Switch Open

Test P70 must pass for P71 to execute.

The condenser fan is started and a 60 second timer is started.

Test passes if the high pressure switch (HPS) closes within the 60-second time limit, otherwise, it fails.

P8 Tests  Perishable Mode Tests: Pretrip tests P70 and P71 must have passed or have been skipped for these tests to execute.

P8-0

Perishable Mode Heat Test

If the container temperature is below 15.6°C (60°F), the set point is changed to 15.6°C, and a 60-minute timer is started. The left display will read P80. The control will then heat the container until 15.6°C is reached.

If the container temperature is above 15.6°C at the start of the test, then the test proceeds immediately to test P81 and the left display will change to P81.

The test fails if the 180-minute timer expires before the control temperature reach­es set point. The display will read P80, FAIL.

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 P81, the right display will show the supply air temperature. The unit will then start to pull down the temperature to the 0°C 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 P81 must pass for P82 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 P82.

During P82, the left display will read P82, 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 con tacts, 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

P9-0

DTT Closed and Open Test

During P90 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. 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:

P10-0

Frozen Mode Setup Test

After completion of the Defrost 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 P101.

During P10, the control temperature will be shown on the right display.

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 set point, the test proceeds to test 10-1.

P10-1

Frozen Mode Pulldown Test

When the container temperature is greater than or equal to the 7.2°C (45°F) set point which was set in the frozen mode heat test, the left display will read P101 and the right display will show the return air temperature. The set point will then be changed to 17.7°C (0°F). The unit will then have a maximum of three hours to pull the container temperature down to the 17.7°C set point.

If this occurs within the three hour time limit, the test passes. If pulldown is not completed within the three hour time, the test fails.

Upon failure and when initiated by an automatic Pretrip sequence, P101 will auto-repeat by starting P100 over again.

P10-2

Frozen Mode Maintain Temperature Test

Test P101 must pass for P102 to execute.

A fifteen minute timer is started, and the system will attempt to minimize control temperature error (return temperature minus setpoint) until the timer expires. The control temperature will be sampled each minute starting at the beginning of P102.

During P101, the left display will read P102 and the right display will show return air temperature.

When the test is completed, the average control temperature error will be com pared to the pass/fail criteria.

Test passes if the average temperature error is within +/-1.6°C.

Test fails if the average temperature error is greater than +/-1.6°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.

Upon failure and when initiated by an automatic Pretrip sequence, P102 will auto-repeat by starting P100 over again.
Table 4–8  DataCORDER Function Code Assignments

Inapplicable Functions Display “-----”

To Access: Press ALT. MODE key then CODE SELECT key

CODE

TITLE

DESCRIPTION

dC1

Recorder Supply Temperature

Current reading of the supply recorder sensor.

dC2

Recorder Return Temperature

Current reading of the return recorder sensor.

dC3-5

USDA 1,2,3 Temperatures

Current readings of the three USDA probes.

dC6-13

Network Data Points 18

Current values of the network data points (as configured). Data point 1 (Code 6) is generally the humidity sensor and its value is obtained from the Controller once every minute.

dC14

Cargo Probe 4 Temperature

Current reading of the cargo probe #4.

dC15-19

Future Expansion

These codes are for future expansion, and are not in use at this time.

dC20-24

Temperature Sensors 15 Calibration

Current calibration offset values for each of the five probes: supply, re­turn, USDA #1, #2, and #3. These values are entered via the interroga­tion program.

dC25

Future Expansion

This code is for future expansion, and is not in use at this time.

dC26,27

S/N, Left 4, Right 4

The DataCORDER serial number consists of eight characters. Function code dC26 contains the first four characters. Function code dC27 con­tains the last four characters. (This serial number is the same as the Controller serial number)

dC28

Minimum Days Left

An approximation of the number of logging days remaining until the Data CORDER starts to overwrite the existing data.

dC29

Days Stored

Number of days of data that are currently stored in the DataCORDER.

dC30

Date of last Trip start

The date when a Trip Start was initiated by the user. In addition, if the system goes without power for seven continuous days or longer, a trip start will automatically be generated on the next AC power up.

dC31

Battery Test

Shows the current status of the optional battery pack.

PASS: Battery pack is fully charged.

FAIL: Battery pack voltage is low.

dC32

Time: Hour, Minute

Current time on the real-time clock (RTC) in the DataCORDER.

dC33

Date: Month, Day

Current date (month and day) on the RTC in the DataCORDER.

dC34

Date: Year

Current year on the RTC in the DataCORDER.

dC35

Cargo Probe 4 Calibration

Current calibration value for the Cargo Probe. This value is an input via the interrogation program.
Table 4–9  DataCORDER Pre-Trip Result Records

TEST

TITLE

DATA

1-0

Heater On

Pass / Fail / Skip Result, Change in current for Phase A, B and C

1-1

Heater Off

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

2-0

Condenser Fan On

Pass / Fail / Skip Result, Water pressure switch (WPS) - Open/Closed, Change in currents for Phase A, B and C

2-1

Condenser Fan Off

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

3-0

Low Speed Evaporator Fan On

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

3-1

Low Speed Evaporator Fan Off

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

4-0

High Speed Evaporator Fan On

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

4-1

High Speed Evaporator Fan Off

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

5-0

Supply/Return Probe Test

Pass / Fail / Skip Result, STS, RTS, SRS and RRS

5-1

Secondary Supply Probe Test

Pass / Fail / Skip Result

5-2

Secondary Return Probe Test

Pass / Fail / Skip Result

6-0

Compressor On

Pass / Fail / Skip Result, Change in currents for Phase A, B and C

6-1

Not Applicable

Not Used

6-2

Suction Modulation Valve Open and Closed

Pass / Fail / Skip Result, Is current or pressure limit in effect (Y,N)

6-4

Not Applicable

Not Used

6-5

Not Applicable

Not Used

7-0

High Pressure Switch Closed

Pass / Fail / Skip Result, AMBS, DPT or CPT (if equipped)

Input values that component opens

7-1

High Pressure Switch Open

Pass / Fail / Skip Result, STS, DPT or CPT (if equipped)

Input values that component closes

8-0

Perishable Heat

Pass / Fail / Skip Result, STS, time it takes to heat to 16°C (60°F)

8-1

Perishable Pull Down

Pass / Fail / Skip Result, STS, time it takes to pull down to 0°C (32°F)

8-2

Perishable Maintain

Pass/Fail/Skip Result, Averaged DataCORDER supply temperature (SRS) over last recording interval.

9-0

Defrost Test

Pass / Fail / Skip Result, DTS reading at end of test, line voltage, line frequency, time in defrost.

10-0

Frozen Mode Setup

Pass / Fail / Skip Result, STS, time unit is in heat.

10-1

Frozen Mode Pull Down

Pass / Fail / Skip Result, STS, time to pull down unit to 17.8°C (0°F).

10-2

Frozen Mode Maintain

Pass / Fail / Skip Result, Averaged DataCORDER return temperature (RRS) over last recording interval.
Table 4–10  DataCORDER Alarm Indications

To Access: Press ALT. MODE key then ALARM LIST key

CODE

TITLE

DESCRIPTION

dAL70

Recorder Supply Temperature Out of Range

The supply recorder sensor reading is outside of the range of 50 to 70°C (58°F to +158°F) or, the probe check logic has determined there is a fault with this sensor.

NOTE

The P5 PreTrip test must be run to inactivate the alarm.

dAL71

Recorder Return Temperature Out of Range

The return recorder sensor reading is outside of the range of 50 to 70°C (58°F to +158°F) or, the probe check logic has determined there is a fault with this sensor.

NOTE

The P5 PreTrip test must be run to inactivate the alarm.

dAL7274

USDA Temperatures 1, 2, 3 Out of Range

The USDA probe temperature reading is sensed outside of 50 to 70°C (58 to 158°F) range.

dAL75

Cargo Probe 4 Out of Range

The cargo probe temperature reading is outside of 50 to 70°C

(58 to 158°F) range.

dAL76, 77

Future Expansion

These alarms are for future expansion, and are not in use at this time.

dAL7885

Network Data Point
1 - 8 Out of Range

The network data point is outside of its specified range. The DataCORDER is configured by default to record the supply and return recorder sensors.

The DataCORDER may be configured to record up to 8 additional network data points. An alarm number (AL78 to AL85) is assigned to each configured point.

When an alarm occurs, the DataCORDER must be interrogated to identify the data point assigned.

When a humidity sensor is installed, it is usually assigned to AL78.

dAL86

RTC Battery Low

The real time clock (RTC) backup battery is too low to adequately maintain the RTC reading.

A real time clock failure is critical to the operation of the unit. If this alarm oc­curs, replace the RTC battery at the next available opportunity. After replac­ing the battery the following actions are required:

Update the RTC setting

Update the unit's software configuration

Update the operational software

Update all user selectable function code settings (defrost, setpoint, etc)

dAL87

RTC Failure

An invalid time has been detected. Either the DataCORDER run time hour and minute have not changed at the start of the hour, or the real time clock (RTC) time has gained or lost more than 2 minutes in the hour. This situation may be corrected by cycling the power, setting the clock or meeting the above criteria for an hour.

dAL88

DataCORDER EEPROM Failure

A write of critical DataCORDER information to the EEPROM has failed.

dAL89

Flash Memory Error

An error has been detected in the process of writing daily data to the nonvol­atile FLASH memory.

dAL90

Future Expansion

This alarm is for future expansion, and is not in use at this time.

dAL91

Alarm List Full

The DataCORDER alarm queue is determined to be full (eight alarms).