4_Microprocessor

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

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

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 / Fahrenheit	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

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

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

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

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

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

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

NOTE

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

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.

Defrosting 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 5.10.

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 (see Table 4–5).

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

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

IDTS 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:

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

2.If a detectable problem is found to exist, its alarm code will be alternately displayed with the set point on the left display.

3.The user should scroll through the alarm list to determine what alarms exist or have existed. Alarms must be diagnosed and corrected before the Alarm List can be cleared.

To Display Alarm Codes:

1.While in the Default Display mode, press the ALARM LIST key. This accesses the Alarm List Display Mode, which displays any alarms archived in the Alarm Queue.

2.The alarm queue stores up to 16 alarms in the sequence in which they occurred. The user may scroll through the list by depressing an ARROW key.

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

4.The right display will show the actual alarm code. “AA##” will display for an active alarm, where “##” is the alarm code. Or “IA##” will display for an inactive alarm.

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

6.“CLEAr” is displayed if all alarms are inactive. The alarm queue may 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 5.9.

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.

•Control mode

•Control temperature

•Frequency

•Humidity

•Phase A current

•Phase B current

•Phase C current

•Main voltage

•Suction modulation valve percentage

•Discrete outputs

•Discrete inputs

•Ambient sensor

•Compressor suction sensor

•Compressor discharge sensor

•Return temperature sensor

•Supply temperature sensor

•Defrost temperature sensor

•Discharge pressure transducer

•Suction pressure transducer

•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

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)

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: a bad cable or connection between DataCORDER and data retrieval device, 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:

1.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.

2.Pre-cool the container to the treatment temperature or below.

3.Install the DataCORDER module battery pack (if not already installed).

4.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.

5.To initiate USDA recording, connect the personal computer and perform the configuration as follows, using the DataLINE software:

a.Enter ISO header information.

b.Enter a trip comment if desired.

c.Configure the DataCORDER for five probes (s, r, P1, P2, P3) (dcf02=5).

d.Configure the logging interval for one hour.

e.Set the sensor configuration to “USDA”.

f.Configure for two byte memory storage format (dcf04=LONG).

g.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:

1.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.

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

3.The left display will show “AL#” where # is the alarms number in the queue. The right display will show “AA##,” if the alarm is active, where ## is the alarm number. “IA##,” will show if the alarm is inactive

4.“END” is displayed to indicate the end of the alarm list if any alarms are active. “CLEAr” is displayed if all the alarms in the list are inactive.

5.If no alarms are active, the Alarm Queue may be cleared. The exception to this rule is the DataCORDER Alarm Queue Full alarm (AL91), which does not have to be inactive in order to clear the alarm list. To clear the alarm list:

a.Press the ALT. MODE & ALARM LIST keys.

b.Press the UP/DOWN ARROW key until “CLEAr” is displayed.

c.Press the ENTER key. The alarm list will clear and “-----” will be displayed.

d.Press the ALARM LIST key. “AL” will show on the left display and “-----” on the right display when there are no alarms in the list.

e.Upon clearing of the Alarm Queue, the Alarm light will be turned off.

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	Dehumidification 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 -10C	Set to -5C
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

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	Capacity Modulation (%)	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 energy. 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	Digital Unloader Valve	Not used in this application
Cd16	Compressor Motor Hour Meter / Unit Run Time Hour Meter	This code displays the compressor motor hours. User can view unit run time by pressing the ENTER key while in Cd16. Total hours are recorded in increments of 10 hours (i.e., 3000 hours is displayed as 300). The Compressor Motor Hour Meter display can be reset to 0 by pressing and holding the ENTER key for 5 seconds. The Unit Run Time Hour Meter cannot be reset
Cd17	Relative Humidity (%)	Humidity sensor reading is displayed. This code displays the relative humidity, as a percent value.
Cd18	Software Revision Number	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	Compressor Run Time Remaining Until Defrost	This code displays the time remaining until the unit goes into defrost (in tenths of an hour). This value is based on the actual accumulated compressor running time.
Cd26	Defrost Temperature Sensor Reading	Defrost Temperature Sensor (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 “AUTO”. 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 (On-Off)	The current state of the economy mode option, -----, On, or Off. CnF22 determines whether economy mode offered. Economy mode is a user selectable mode of operation provided for power saving purposes.
Cd35	Bulb Mode	The current state of the bulb mode option, -----, nOr, or bULb. (Replaced by Cd48 if CnF50, Enhanced Bulb Mode, is active.) Bulb mode is an extension of dehumidification control (Cd33). If dehumidification (CnF04) is set to Off, Cd35 will display Nor and the user will be unable to change it. CnF28 determines whether the bulb mode selection is offered. After a dehumidification set point has been selected and entered for code Cd33, the user may then change Cd35 to bulb. After Bulb Mode has been selected and entered, the user may then utilize function codes Cd36 and Cd37 to make the desired changes.
Cd36	Evaporator Fan Speed Select	This is the desired evaporator fan speed for use during the bulb Dehumidification and Humidification mode option. (Replaced by Cd48 if CnF50, Enhanced Bulb Mode, is active.) This code is enabled only if in the dehumidification mode (Cd33) and bulb mode (Cd35) has been set to bulb. If these conditions are not met, alt will be 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	eAutoFresh 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 ----
Cd43	XtendFRESH Mode	Cd43 has three selectable modes of operation: FRESH - All XtendFRESH operations are enabled and setpoints for CO₂ and O₂can be edited. OFF - All XtendFRESH operations are disabled. TEST - the operator has the ability to test operation of mechanical components, test and calibrate the CO₂ sensors and verify the validity of the O₂ sensor.
Display Only Function - Cd44 is a display only function.
Cd44	eAutoFresh Values / CO₂Sensor Status	Code Cd44 displays the eAutoFresh CO₂and O₂values (CO₂and O₂) and CO₂and O₂limits (CO₂LIMand O₂LIM), respectively. This function code will be dashed out if not configured for eAutofresh. This function code will be dashed if CO₂sensor is not detected, and a sensor is not expected (didn't have one previously). This function code will display ChECK if a CO₂sensor 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)
Cd44	XtendFRESH Values	Cd44 allows the user to view the following XtendFRESH values: CO₂setpoint, CO₂ percentage, O₂setpoint, O₂ percentage, and O₂voltage. For the CO₂setpoint, the range is from 0 to 19% in 1% increments with a default setting of 5%. For the O₂setpoint, the range is from 3% to 21% in 1% increments with a default setting of 10%.
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	Dehumidification / Bulb Cargo Mode Parameter Selection	Initially Cd48 will display current dehumidification-mode; bUlb - bulb cargo mode, dEhUM - normal dehumidification, or OFF - off. This display is steady. Pressing ENTER key will take the interface down into a hierarchy of parameter selection menus (mode, setpoint, evaporator speed, DTT setting). Pressing ENTER key in any parameter selection menu commits to selection of the currently displayed parameter and causes the interface to descend into the next parameter selection menu. All parameter selection menus alternate between a blank display and the current selection in the right hand display. Pressing CODE SELECT key in a selection menu cancels the current selection activity and ascends back up to the next higher selection menu (or to Cd48 display mode if that is the next higher). If the operator does not press any key for five seconds the interface reverts to normal system display and the current selection menu is 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	Quest 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 Setpoint 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.
Cd58	Water Pressure Switch / Condenser Fan Switch State or Override Logic State	Cd58 will display “CLOSE” if the WPS or CFS switch contacts are closed or if these options are not installed. “OPEn” is displayed when the WPS or CFS switch contacts are open. When the WPS/CFS Override Logic is “TRUE”, the right display will flash on all units. NOTE: 1. This CLOSE/OPEn state displayed in this Code Select function only applies to units that have the ability to detect the state of a WPS/CFS. This function should not be relied upon to display the condition of the switch on units that don’t have a WPS/CFS switch connected to ECG2 exclusively. 2. The right display will flash if the WPS/CFS Override Logic is TRUE on all units. This is always the case, whether the unit has a WPS or CFS installed or not. 3. The ability of the WPS/CFS Override Logic to control the condenser fan is limited. It is not possible for this logic to control the fan on units that have the WPS or CFS wired in series with the fan contactor. Units wired in this configuration can indicate that the WPS/CFS Override Logic is active by flashing the right display, however, the wiring will not allow for control of the condenser fan
Configurable Functions - 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. “-----” will be displayed if CnF68 is configured OUT.
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.
Cd65	TripWise	If the function is off, display "OFF". If the function is on, display "ON". “-----” will be displayed if the TripWise option is not active for the current configuration. Press the ENTER key. The existing entry will flash. Use the Arrow keys to alternate between OFF and ON. Press ENTER again to set the Expiration Interval. Left display: “dAyS” Right display: Expiration Interval 2 through 365 in one day increments. Default value is 30.
Cd66	Instantaneous Power (kW)	Real power in kW currently being used by the system. Value is “-----“,“ nnn.n Display “-----“ if not configured else nnn.n
Cd67	Total Power (kW-hr)	Energy used by the system, in kW-hrs, since last Trip Start. Value is “-----“,“ nnnnn Display “-----“ if not configured else nnnnn
Cd70	Temp Setpoint Lock	Cd70 locks out setpoint selection, requiring the user to manually turn the lock off, prior to making a setpoint change. If the setpoint lock is “ON”, and the user attempts to enter a new setpoint, a message “SPLK” (Setpoint Lock) is in the left display and “ON” in the right display for five seconds. Press the ENTER key. “SPLK” will display along with the current setting of “ON” or “OFF”. Use the Arrow keys to change the selection - the new selection will then flash for five seconds. Press the ENTER key to confirm the new selection. An event will be recorded in the DataCorder each time the action of turning it “ON” or “OFF” is taken. Default setting is “OFF”. Unit will default to “OFF” with the selection of PTI or a TripWise on the unit.

Figure 4.12 Alarm Troubleshooting Sequence

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
Cause:	The VPS is reading greater than 0 CMH while unit is in frozen mode or XtendFRESH active.
	Component	Vent Position Sensor (VPS)
	Troubleshooting	Manually reposition vent and confirm using Cd45. Refer to Vent Position Sensor Service, Section 7.23.
	Corrective Action	If unable to obtain zero reading, replace defective VPS.

AL09	O2 Sensor Failure
Cause:	Triggered anytime the O₂ sensor reading is outside of the normal operation range, after an initial signal was detected.
	Component	O₂ Sensor, O₂ Amplifier, Sensor Switch Module (if equipped)
	Troubleshooting	Check Cd44 and scroll down to 02V. The O₂ sensor output will be displayed in millivolts (130mV to 4100mV). Switch equipped: If voltage is not present at Cd44 and a sensor switch module is installed, check for O₂ voltage on the black wire connected to the sensor switch module, connecting ground of meter to TP9. If the voltage is in the 130mV to 4.1V range, directly wire the black wire to KD04. This may cause an AL07 depending on O₂ reading but XtendFRESH will operate normally. If no voltage on the black wire, proceed to next step. Check wiring (see schematic), and correct if found mis-wired. If O₂ sensor is available, remove the upper fresh air panel and evaporator motor and replace the sensor. If after replacing sensor AL09 continues, replace amplifier. If parts are not available, turn XtendFRESH option off (Cd43) and open the Manual Fresh Air Vent.

AL09

O2 Sensor Failure

Cause:

Triggered anytime the O₂ sensor reading is outside of the normal operation range, after an initial signal was detected.

Component

O₂ Sensor, O₂ Amplifier, Sensor Switch Module (if equipped)

Troubleshooting

Check Cd44 and scroll down to 02V. The O₂ sensor output will be displayed in millivolts (130mV to 4100mV).

Switch equipped: If voltage is not present at Cd44 and a sensor switch module is installed, check for O₂ voltage on the black wire connected to the sensor switch module, connecting ground of meter to TP9. If the voltage is in the 130mV to 4.1V range, directly wire the black wire to KD04. This may cause an AL07 depending on O₂ reading but XtendFRESH will operate normally. If no voltage on the black wire, proceed to next step.

Check wiring (see schematic), and correct if found mis-wired.

If O₂ sensor is available, remove the upper fresh air panel and evaporator motor and replace the sensor. If after replacing sensor AL09 continues, replace amplifier.

If parts are not available, turn XtendFRESH option off (Cd43) and open the Manual Fresh Air Vent.

AL10	CO₂ Sensor Failure
Cause:	Alarm 10 is triggered when the CO₂sensor voltage is operating outside of the normal operating range, after an initial signal was detected.
	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	AL12 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 Defrost, 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 QC1:
	Troubleshooting	If voltage is present, it indicates a defective microprocessor.
	Corrective Action	Refer to Controller Service, Section 7.21.

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 7.21.

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 7.15.

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 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 4 & 6.
	Corrective Action	Replace defective condenser fan motor. Refer to 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 7.22.

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 7.21.

AL29	AutoFresh Failure (eAutoFresh)
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.

AL29	Loss of Atmospheric Control (XtendFRESH)
Cause:	Triggered whenever the CO₂ level is above its upper limit by 1% for 60 minutes. Or, when the O₂ level is greater than 1% below its setpoint for longer than 30 minutes after the unit has been in range. The alarm is triggered off when the levels return to within the normal range.
	Setup	Run Cd43 test mode for troubleshooting the below components. At the end of test mode, a sensor calibration will be attempted. Under loaded box conditions, the sensor values may post “No Cal” or “CAL FAIL”. Results from original calibration will be retained. If test mode times out, then hold the code select key for 3 seconds to exit test mode.
	Troubleshooting	If components do not energize, check FX1 and FX2 for power (460 VAC). If fuse is open, check heater continuity (XHT1 to ground). Must be greater than 1 mega ohm. If less than 1, disconnect the heater at XHT1 and XHT2. Replace fuse. Unit will control on fresh air solenoids.
	Component	Solenoid Air Vents.
	Troubleshooting	Visually inspect to see if the Solenoid Valves are opening air vents. If vents open, troubleshoot the next component. If vents do not open, continue with troubleshooting below. Check FX4 fuse for power (~20 volts dc). If fuse is open, check wiring and or replace solenoid if part is available. If no part is available, open manual fresh air vent.
	Component	XtendFRESH Fan(s) / XtendFRESH Scrubber Motor
	Troubleshooting	Visually inspect to see if the XtendFRESH Fan(s) are running (air blowing on left, intake on right), check current draw of motor at the XST1 (~40 to 200 milliamps / contactor load side). Troubleshoot the non-operating component. If both are running, proceed to next component. Verify XS contactor is pulling in. If not, check FX6 fuse for power (24 VAC). If not, check power at controller KB4. Check FX3 fuse for power (~20 vdc). If no power, replace fuse. If fuse opens a second time, take no further action. O₂ level will be controlled with the opening and closing of the fresh air vents. If part is available, replace either fan or scrubber motor. Fan is replaceable from the front on a loaded unit; Scrubber motor is not. If no part is available or accessible, take no action and service at next PTI. O₂ level will be controlled with the opening and closing of the fresh air vents.
	Component	Heater
	Troubleshooting	Verify XH contactor is pulling in. If not, check FX6 for power (24 VAC). If open ohm contactors XHA1 and XSA1 to ground. Replace (12 Amp) contactor. If contactor is pulling, power unit off and check heater resistance from XH1 to XH2 (450 to 500 ohms). If heater is outside of the range, disconnect heater at XHT1 and XHT2 and replace at next PTI. Unit will control on fresh air solenoids.

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 7.21.

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 Battery Replacement, Section 7.21.5.

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 7.22.

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 7.22.

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 7.22.
	Corrective Action	Replace AMBS if defective. Refer to Temperature Sensor Service, Section 7.22.

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 7.22.2.
	Corrective Action	Replace the DTS if defective. Refer to Sensor Replacement, Section 7.22.4.

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 Evaporator Heater Removal and Replacement, Section 7.13.
	Component	Contactor
	Troubleshooting	Check voltage at heater contactor on the heater side.
	Corrective Action	If no voltage present, replace heater contact or if defective.

AL62	O2 Out of Range
Cause:	This is a notification alarm and does not pose a risk to fresh produce. It is triggered when there is an indication that O₂ level is rising after reaching its setpoint (+ 1%). If O₂ level exceeds 4% above setpoint, the alarm is activated. The alarm does not activate if the unit was pre-tripped or trip started between last reaching its O₂ setpoint and exceeding the plus 4%, or if power has been turned off for eight hours. The alarm is deactivated if O₂ drops below setpoint (+ 1%) or if a pre-trip or trip start is performed.
	Component	Scrubber Failure
	Troubleshooting	See the troubleshooting of the Scrubber Motor in the AL29 alarm.
	Component	XtendFRESH Solenoid Valves
	Troubleshooting	See the troubleshooting of the Solenoid Air Vent in the AL29 alarm.
	Component	Container Air Tightness
	Troubleshooting	Seal container where possible (access panels, rear doors, mounting hardware, etc).

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 7.22.
	Corrective Action	Replace the CPDS if defective. Refer to Temperature Sensor Service, Section 7.22.

AL65	Discharge Pressure Transducer (DPT)
Cause:	Compressor Discharge Transducer is out of range.
	Component	Compressor Discharge Transducer (DPT)
	Troubleshooting	Confirm accurate DPT pressure readings. Refer to Manifold Gauge Set, Section 7.2.
	Corrective Action	Replace DPT if defective.

AL66	(SPT) Suction Pressure Transducer, (EPT) Evaporator Pressure Transducer
Cause:	Suction Pressure Transducer (SPT) out of range.
	Component	Suction Pressure Transducer (SPT)
	Troubleshooting	Confirm accurate EPT and SPT pressure readings. Refer to Manifold Gauge Set, Section 7.2. Performing a Pre-trip 5-9 test will also check the transducers.
	Corrective Action	Replace EPT/SPT if defective.
	Component	Suction Pressure Transducer (SPT)
	Troubleshooting	Monitor
	Corrective Action	If the alarm persists, it may indicate a failing compressor. Refer to Compressor Service, Section 7.8.

AL67	Humidity Sensor
Cause:	Humidity Sensor (HS) reading out of range.
	Component	Humidity Sensor (HS)
	Troubleshooting	Make sure the humidity sensor is properly connected in the socket and the wires have not been dam aged.
	Corrective Action	Monitor, replace HS if alarm persists.

AL68	CPC Pressure Transducer
Cause:	Condenser Pressure Transducer (CPC) out of range.
	Component	Condenser Pressure Transducer (CPC)
	Troubleshooting	NA
	Corrective Action	Unit will disable Condenser 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 7.22.
	Corrective Action	Replace CPSS if defective. Refer to Temperature Sensor Service, Section 7.22.

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 7.22.

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 7.22.

AL72	Control Temp Out of Range
Cause:	After the unit goes in-range for 30 minutes then out of range for a continuous 120 minutes.
	Component	Refrigeration System
	Troubleshooting	Ensure unit is operating correctly.
	Corrective Action	Power cycle unit. Control Temperature is in In-range. Any Pre-trip mode, resets the timers

AL96	Scrubber Rotational Feature - optional feature
Cause:	Feedback from the Scrubber Motor to the controller is not sensed when the motor is turning.
	Component	Scrubber Fuse
	Troubleshooting	Check to see if Scrubber Fuse is blown. Replace Fuse if necessary.
	Component	Scrubber Motor
	Troubleshooting	Run Test Mode and verify scrubber bed is turning. If back panel cannot be removed to check, verify the scrubber amperage consumption, read at XS contactor wire XSL1. If between 40 and 200mA, motor is rotating properly. If no current detected, check and replace FX3. If current spiking to 350mA for 2 seconds then dropping to 90mA, the scrubber motor is located. If scrubber motor is locked, further inspection of the scrubber bed is required. Unit will control CO₂ with the fresh air solenoid when this alarm occurs if scrubber inaccessible. If Scrubber Motor not operating, follow the troubleshooting flowchart in XtendFresh manual and take appropriate action.
	Component	Ground Interface Module (GIM)
	Troubleshooting	Once it has been verified that the scrubber motor is rotating, check the wiring connections to the GIM module. If all wires secured properly, re-place the GIM module if one is available. If not, the unit will control CO₂ using the fresh air solenoids.

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).