Status Messages and Controller Actions

When:

• If HPCO is detected and the configuration is set to water cooled condenser.

Indicates:

• Poor cooling water supply.

Controller auto clears message 10 minutes after compressor start-up.

Water cooled condensing may be wrongly selected.

When:

• Unit stops due to high pressure cutout and the condensing temperature regulation has not activated the condenser fan.

Indicates:

• Wrong location of condenser probe.

Controller auto clears message 10 minutes after compressor start-up.

Check location of condenser probe.

When:

• Unit stops due to high pressure cutout and the condensing temperature regulation has activated the condenser fan.

Indicates:

• Poor cooling of the refrigerant.

Controller auto clears message 10 minutes after compressor start-up.

Check for high ambient temperature.

Check condenser fan rotation.

Check for blocked condenser coil.

When:

• If the state “Hot Evaporator Section” is active and the control calls for heat, the message is set.

• The state “Hot Evaporator Section” is defined either by:

  • RA probe error and Defrost probe error.

  • RA, SA, or defrost probe is above 50C.

• The message is held by a 60 second timer after the conditions clear.

Indicates:

• Evaporator section temperatures are high.

  • Supply Air, Return Air, and Defrost indicates high temperature.

Enter Manual Function Test menu and test (operate) heating element. Check volts and amps to determine problem.

Use DATA menu to evaluate evaporator section sensors.

Use PROBE TEST to evaluate if evaporator sensors are reading correctly.

When:

• Low voltage observed, voltage has been below 330 VAC and has not risen above 340 VAC yet.

• After 30 minutes this message will set the low voltage alarm.

Indicates:

• Poor quality of power source.

Enter Manual Function Test menu and test (operate) components to load the power source.

Check volts and amps to help determine the problem.

When:

• The component current draw exceeds expected. 50% above expected amps for four minutes.

Indicates:

• Digital Control valve malfunction.

• Compressor, evaporator fans motor, condenser fan motor or heater current too high.

• Defective volt or amp meter on power module.

• Power supply voltage too low.

Enter Manual Function Test menu and test (operate) each component.

Check volts and amps to determine which component has high amp draw.

Check power supply volts.

Check volt and ampere meter.

When the message is set, the current power consumption is logged in the event log.

When:

• The component current draw exceeds expected. 50% below expected for four minutes.

Indicates:

• Defective or open high pressure cutout switch.

• Defective or open motor internal high temperature protection switch.

• Unit on water-cooled condensing with no water flow.

• Defective condenser coil sensor or sensor location.

Check Display for High Pressure Cutout message.

Enter Manual Function Test menu and test (operate) each component.

Check volts and amps to determine which component has low amp draw.

Check volt and ampere meter.

When:

• During Chill or Frozen Mode: Supply air temperature is too high compared to return air temperature under operating conditions. The state will by time request defrost or/and probe test.

Indicates:

• Low refrigerant charge

• Incorrect connection or location of supply or return air sensor

• Air leakage at supply air sensor cable

• Ice or frost on evaporator coil

• Incorrect evaporator fan operation

Use DATA menu to inspect readings.

Enter Manual Function Test menu and operate evaporator fan at high speed to evaluate probe spread.

When:

• During Chill or Frozen Mode: Supply air temperature is too low compared to return air temperature under operating conditions. The state will by time request extended defrost, defrost or/and probe test.

Indicates:

• Incorrect connection or location of supply or return air sensor.

• Air leakage at supply air sensor cable.

• Incorrect evaporator fan operation.

Use DATA menu to inspect readings.

Enter Manual Function Test menu and operate evaporator fan at high speed to evaluate probe spread.

When:

• During Chill or Frozen Mode: Evaporator coil temperature is too high compared to return air temperature under operating conditions.

Indicates:

• Probe spread, misplaced probes.

Use DATA menu to inspect readings.

Enter Manual Function Test menu and operate evaporator fan at high speed to evaluate probe spread.

When:

• During Chill or Frozen Mode: Evaporator coil temperature is too low compared to return air temperature under operating conditions. The state will by time request extended defrost, defrost or/and probe test.

Indicates:

• Ice on the evaporator coil, need for defrost.

• Probe error.

Use DATA menu to inspect readings.

Enter Manual Function Test menu and operate evaporator fan at high speed to evaluate probe spread.

When:

• The message is related to the capacity surveillance system which observes the reefer machine capability to create a temperature drop between return air and supply air when expected to be running at high capacity.

Action:

• If the expected delta temperature is not reached, the message is set and the evaporator fans stopped to prevent heating the cargo.

Indicates:

• Lack of refrigerant.

Check Refrigerant level.

Check for refrigerant flow through the system, look for restrictions.

When:

• If AVL door is open in frozen set point mode.

Indicates:

• Air ventilation ought to be in position closed when running within frozen mode.

Check air ventilation door position.

When:

• Unit stop due to high pressure cutout signal from the HPCO switch.

• The message will clear when the input signal indicates normal condition.

Indicates:

• Poor or missing cooling of the refrigerant.

Action:

• The state will stop / remove the compressor run signal.

• The state will overrule regulation of the condenser fan and starts the fan.

• This state will activate and hold message 31 as long as the input signal indicates HPCO.

Controller clears message on compressor start-up.

No direct alarm action based on this situation.

If the state continues:

• Check for airflow through the condenser coil, air flow might be blocked.

• Check for condenser fan rotation and direction, must suction air through the coil and blow air out through the grill.

When:

• The message is timer based to protect the compressor from starting at high pressure. The message will go away when the holding time after HPCO gets normal has run out.

Indicates:

• HPCO present or has just been present.

Action:

• The state will stop / remove the compressor run signal.

• The state will overrule regulation of the condenser fan and starts the fan.

• This state will activate and hold message 31 as long as the input signal indicates HPCO.

Controller clears message on compressor start-up.

No direct alarm action based on this situation.

If the state continues:

• Check for airflow through the condenser coil, air flow might be blocked.

• Check for condenser fan rotation and direction, must suction air through the coil and blow air out through the grill.

When:

• Unit stops due to low pressure cutout signal from the HPCO switch or the suction pressure reading (if present).

• If suction pressure sensor is mounted the signal level for LPCO is below -0.27 bar to activate LPCO state and above +0.38 bar to clear the state.

• The message will clear when the input signal indicates normal condition.

Indicates:

• Possible causes include low refrigerant charge, defective low pressure cutout switch or open circuit, block TXV or suction line restriction etc.

Action:

• The state will stop / remove the compressor run signal.

• This state will activate and hold status message 33 as long as the input signal indicates LPCO.

Controller activates Alarm Code 31 after five minutes.

Controller clears message after compressor start-up.

When:

• The message is timer based to protect the compressor from starting before the pressure has risen from low pressure. The message will clear when the holding time after LPCO gets normal has run out.

Indicates:

• LPCO present or has just been present.

Controller clears message on compressor start-up.

No direct alarm action based on this situation.

When:

• If the compressor temperature gets above 148C, the message is set.

• The message will clear when the compressor temperature has been below 137C for 60 seconds.

• The message will (also) clear when the compressor temperature gets below 132C.

Indicates:

• Compressor stops because discharge temperature is above 148 C (300 F). Message remains in display until discharge temperature decreases to normal.

Action:

• The state will stop / remove the compressor run signal.

• The state will overrule regulation of the condenser fan and starts the fan.

The message clears itself when the compressor temperature is normal.

When:

• If the compressor temperature gets above 138C, the message is set.

• The message will clear when the compressor temperature gets below 132C.

Action:

• Compressor running at high discharge temperature results in economizer/vapor injection will be active until discharge temperature decreases to normal.

• In temperature log the state will be represented by the char ‘c’ (small c).

The message clears itself when the compressor temperature is normal.

When:

• If configuration is AVL, the setting is below 125CMH and the AVL sensor indicates full open / dismounted door, the message is set.

Indicates:

• Wrongly dismounted air ventilation door.

Check air exchange position vs setting.

When:

• With AFAM+ option the CO2 level is constantly monitored. If the reading does not change / fluctuates minimum 0.1% within 24 hour the message is set.

The message will clear itself 10 minutes after a change has been observed.

Check gas analyzer readings.

When:

• High voltage observed, voltage has been above 515 Vac. The message will clear when voltage gets below 500 Vac.

Indicates:

• When the message is set, a power line value log is made in the event log, i.e., “CURR: 0.2A PH1: 0.2A PH2: 0.2A PH3: 0.3A VOLT: 529V FREQ: 63Hz “.

Enter Manual Function Test menu and test (operate) components to load the power source.

Check volts and amps to help determine the problem.

Possible cause for the problem is a wild running generator set.

When:

• The data logger battery charger reports battery charging suspended due to low temperature and the battery internal heater has been on for two hours, the message is set.

Indicates:

• Fault in the data logger battery circuit.

Check for battery position, placement, and wiring.

When:

• If the sensor supply (+ 12 Vdc) for the humidity or pressure transducers is not able of supplying the 12 Vdc.

Indicates:

• Too high load on the sensor supply.

Check humidity sensor or transducer.

When:

• If the power module heat exchanger temperature gets above 95C the heating element is bypassed and not energized. Since activating the heating element is the far most heat applying solid state switch, activating is bypassed to reduce temperature.

Indicates:

• High temperature surrounding the control box.

• Poor cooling to the back side of the control box.

Check for blocked air flow to the back side of the control box.

Ambient temperature may be high.

CA Unit is having too frequent LPCOs.

CA Unit is having too frequent HPCOs.

CA Unit needs attention.

When:

• Occurs if the wall clock has been stopped or restarted as a result of insufficiently voltage.

The wall clock battery must be replaced.

When:

• Low battery voltage observed. The battery voltage has been below 3.7V. The voltage must be above 2.5V to trigger the message.

Leave the unit on (could be standby mode) for four hours to charge the battery.