Alarm Codes and Corrective Actions

• When the sensor circuit resistance is higher than 1300Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3A pin 1 and 3.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +75°C (approx 1300Ω).

• When the sensor circuit resistance is lower than 602Ω.

• Indicates:

  • Short circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3A pin 1 and 3.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +75°C (approx 1300Ω).

• When the sensor circuit resistance is higher than 1300Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3A pin 5 and 7.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +75°C (approx 1300Ω).

• When the sensor circuit resistance is lower than 602Ω.

• Indicates:

  • Short circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3A pin 5 and 7.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +75°C (approx 1300Ω).

• When the sensor circuit resistance is higher than 1300Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3A pin 9 and 11.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +75°C (approx 1300Ω).

• When the sensor circuit resistance is lower than 602Ω.

• Indicates:

  • Short circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3A pin 9 and 11.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +75°C (approx 1300Ω).

• Occurs during pretrip (PTI) or function test only.

• During compressor test, if Compressor power consumption is 25% above expected current draw or compressor phase current level differs 33% or more.

• If both alarm #6 and #7 is active this indicates too high phase difference.

• Expected compressor current is a function of the surrounding conditions.

• Indicates:

  • Defective Digital Control valve.

  • Defective compressor.

  • Defective volt or amp meter on current transmitter.

  • Inaccurate ambient, condenser or evaporator temperature measurement.

  • Excessive condenser pressure due to air or wrong refrigerant in system, or refrigerant over charge.

• Check evaporator and condenser sensor temperatures for correct value (± 5 C [± 9 F]) by viewing Data menu.

• To determine the current draw measurement, enter Manual Function Test menu. Start and check current draw of the following components separately and together: compressor, compressor full loaded, condenser fan and evaporator fan (high or low).

• Check power supply volts on all three phases.

• Occurs during pretrip (PTI) or function test only.

• During compressor test, if Compressor power consumption is 25% below expected current draw or compressor phase current level differs 33% or more.

• If both alarm #6 and #7 is active this indicates too high phase difference.

• Expected compressor current is a function of the surrounding conditions.

• Indicates:

  • Defective or open high pressure cutout switch.

  • Defective or open low pressure cutout switch or transmitter if mounted.

  • Defective compressor relay.

  • Defective volt or amp meter on current transmitter.

  • Low refrigerant charge.

  • Defective compressor.

  • Inaccurate condenser or evaporator temperature measurement.

  • Defective or open compressor motor internal over temperature protection switch.

• Check evaporator, condenser sensor temperatures for correct value (± 5 °C [± 9 F]) by viewing Data menu.

• To determine the current draw measurement, enter Manual Function Test menu. Start and check current draw of the following components separately and together: compressor, compressor full loaded, condenser fan and evaporator fan (high or low).

• Check discharge and suction pressure gauge readings.

• Check power supply volts on all three phases.

• Occurs during pretrip (PTI) or function test only.

• Heater power consumption is 25% above expected current draw or phase current level differs 33% or more.

• If both alarm #10 and #11 is active this indicates too high phase difference.

• Expected heater current is a function of the heating element resistance and the power supply voltage.

• The unit may be equipped with extended heating capability.

• Normal heating element 4kw@460VAC - above approximately 6,3 Amp / 5,3 Amp.

• Extended heating element 6kw@460VAC - above approximately 9,4Amp / 8,1Amp.

• Indicates:

• Enter Manual Function Test and turn heaters on. Check current draw on each phase. Evaluate current draw in relation to expected values.

• Enter configuration menu and check the heating element setting.

• Check heater resistance.

• The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• Normal heating element 4kw@460VAC

  • expects 5,0Amp@460VAC.

  • expects 4,3Amp@400VAC.

  • expected resistance 99Ω on each leg.

• Extended heating element 6kw@460VAC

  • expects 7,5Amp@460VAC.

  • expects 6,5Amp@400VAC.

  • expected resistance 66Ω on each leg.

• Occurs during pretrip (PTI) or function test only.

• Heater power consumption is 25% below expected current draw or phase current level differs 33% or more.

• If both alarm #10 and #11 is active this indicates too high phase difference.

• Expected heater current is a function of the heating element resistance and the power supply voltage.

• The unit may be equipped with extended heating capability.

• Normal heating element 4kw@460VAC:

  • below approximately 3,7Amp / 3,2Amp.

• Extended heating element 6kw@460VAC:

  • below approximately 5,6Amp / 4,8Amp.

• Indicates:

  • Incorrect heaters or heater connections.

  • Defective heating element.

  • Defective volt or amp meter on current transmitter.

• Enter Manual Function Test and turn heaters on. Check current draw on each phase. Evaluate current draw in relation to expected values.

• Enter configuration menu and check the heating element setting.

• Check heater resistance.

• The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• Normal heating element 4kw@460VAC:

  • expects 5,0Amp@460VAC

  • expects 4,3Amp@400VAC

  • expected resistance 99Ω on each leg.

• Extended heating element 6kw@460VAC:

  • expects 7,5Amp@460VAC

  • expects 6,5Amp@400VAC

  • expected resistance 66Ω on each leg.

• Occurs during pretrip (PTI) or function test only.

• Fan power consumption is 33% above expected current draw or phase current level differs 33% or more.

• If both alarm #12 and #13 is active this indicates too high phase difference.

• Expected fan current is a function of the power line frequency and the supply voltage.

• With 20’ setting above approximately:

  • 3,4Amp@400VAC/50Hz

  • 4,2Amp@460VAC/60Hz

• With 40’ setting above approximately:

  • 2,7Amp@400VAC/50Hz

  • 3,4Amp@460VAC/60Hz

• Indicates:

  • Defective or stuck evaporator fan motor.

  • Incorrect motor or motor connections.

  • Defective volt or amp meter on current transmitter.

• Open evaporator door and make sure all fans rotate freely.

• Enter Manual Function Test and start evaporator fans on high speed. Make sure all fans start on high speed. Check fan motor volts and amps.

• With 20’ setting expect:

  • 2,4Amp@400VAC/50Hz

  • 3,1Amp@460VAC/60Hz

• With 40’ setting expect:

  • 1,8Amp@400VAC/50Hz

  • 2,4Amp@460VAC/60Hz

• Occurs during pretrip (PTI) or function test only.

• Fan power consumption is 33% below expected current draw or phase current level differs 33% or more.

• If both alarm #12 and #13 is active this indicates too high phase difference.

• Expected fan current is a function of the power line frequency and the supply voltage.

• With 20’ setting below approximately:

  • 1,4Amp@400VAC/50Hz

  • 2,0Amp@460VAC/60Hz

• With 40’ setting below approximately:

  • 0,9Amp@400VAC/50Hz

  • 1,4Amp@460VAC/60Hz

• Indicates:

  • Defective or open fan motor internal over temperature protection switch.

  • Incorrect motor or motor connections.

  • Defective volt or amp meter on current transmitter.

• Open evaporator door and make sure all fans rotate freely.

• Enter Manual Function Test and start evaporator fans on high speed. Make sure all fans start on high speed. If a motor does not start and is very hot, wait 10 minutes for internal over temperature switch to close.

• Enter Manual Function Test and start evaporator fans on high speed. Make sure all fans start on high speed. Check fan motor volts and amps.

• With 20’ setting expect:

  • 2,4Amp@400VAC/50Hz

  • 3,1Amp@460VAC/60Hz

• With 40’ setting expect:

  • 1,8Amp@400VAC/50Hz

  • 2,4Amp@460VAC/60Hz

• Occurs during pretrip (PTI) or function test only.

• Fan power consumption is 33% above expected current draw or phase current level differs 33% or more.

• If both alarm #14 and #15 is active this indicates too high phase difference.

• Expected fan current is a function of the power line frequency and the supply voltage.

• With 20’ setting above approximately:

  • 1,0Amp@400VAC/50Hz

  • 1,2Amp@460VAC/60Hz

• With 40’ setting above approximately:

  • 1,0Amp@400VAC/50Hz

  • 1,2Amp@460VAC/60Hz

• Indicates:

  • Defective or stuck evaporator fan motor.

  • Incorrect motor or motor connections.

  • Defective volt or amp meter on current transmitter.

• Open evaporator door and make sure all fans rotate freely.

• Enter Manual Function Test and start evaporator fans on Low speed. Make sure all fans start on low speed. Check fan motor volts and amps.

• With 20’ setting expect:

  • 0,8Amp@400VAC/50Hz

  • 0,9Amp@460VAC/60Hz

• With 40’ setting expect:

  • 0,8Amp@400VAC/50Hz

  • 0,9Amp@460VAC/60Hz

• Occurs during pretrip (PTI) or function test only.

• Fan power consumption is 33% below expected current draw or phase current level differs 33% or more.

• If both alarm #14 and #15 is active this indicates too high phase difference.

• Expected fan current is a function of the power line frequency and the supply voltage.

• With 20’ setting below approximately:

  • 0,5Amp@400VAC/50Hz

  • 0,6Amp@460VAC/60Hz

• With 40’ setting below approximately:

  • 0,5Amp@400VAC/50Hz

  • 0,6Amp@460VAC/60Hz

• Indicates:

  • Defective or open fan motor internal over temperature protection switch.

  • Incorrect motor or motor connections.

  • Defective volt or amp meter on current transmitter.

• Open evaporator door and make sure all fans rotate freely.

• Enter Manual Function Test and start evaporator fans on low speed. Make sure all fans start on low speed. If a motor does not start and is very hot, wait 10 minutes for internal over temperature switch to close.

• Enter Manual Function Test and start evaporator fans on high speed. Make sure all fans start on high speed. Check fan motor volts and amps.

• With 20’ setting expect:

  • 0,8Amp@400VAC/50Hz

  • 0,9Amp@460VAC/60Hz

• With 40’ setting expect:

  • 0,8Amp@400VAC/50Hz

  • 0,9Amp@460VAC/60Hz

• Occurs during pretrip (PTI) or function test only.

• Fan power consumption is 33% above expected current draw or phase current level differs 33% or more.

• If both alarm #16 and #17 is active this indicates too high phase difference.

• Expected fan current is a function of the power line frequency and the supply voltage.

• Above approximately:

  • 1,5Amp@400VAC/50Hz

  • 1,8Amp@460VAC/60Hz

• Indicates:

  • Defective or stuck condenser fan motor.

  • Incorrect motor or motor connections.

  • Defective volt or amp meter on current transmitter.

• Enter Manual Function Test and start condenser fan. Make sure the fan starts.

• Check fan motor volts and amps.

• Expect:

  • 1,0Amp@400VAC/50Hz

  • 1,2Amp@460VAC/60Hz

• Occurs during pretrip (PTI) or function test only.

• Fan power consumption is 33% below expected current draw or phase current level differs 33% or more.

• If both alarm #16 and #17 is active this indicates too high phase difference.

• Expected fan current is a function of the power line frequency and the supply voltage.

• Above approximately:

  • 0,5Amp@400VAC/50Hz

  • 0,6Amp@460VAC/60Hz

• Indicates:

  • Defective condenser fan motor relay.

  • Incorrect motor or motor connections.

  • Defective or open fan motor internal over temperature protection switch.

  • Defective volt or amp meter on current transmitter.

• Enter Manual Function Test and start condenser fan. Make sure the fan starts.

• Check fan motor volts and amps.

• Expect:

  • 1,0Amp@400VAC/50Hz

  • 1,2Amp@460VAC/60Hz

• Shutdown Alarm

• The current transmitter and/or controller is not capable of detecting the rotation direction.

• Indicates:

  • Phase(s) missing at the power supply line.

  • Current transmitter and/or Controller failure.

  • Heating element problem (used for current load to decide the rotation direction).

• Check power line voltage on all three phases.

• Use the tester to detect the problem.

• Replace the current transmitter and/or controller.

• Occurs during Normal Run only.

• After 75 minutes of operation, supply or return air temperature is not in-range and does not approach setpoint within preset pull-down rate.

• Indicates:

  • Ice or frost on evaporator coil.

  • Low refrigerant charge.

  • Air exchange vent open too much.

  • Container air leakage (doors open).

• Use DATA menu to check supply and return air sensor temperatures.

• Compare temperatures to evaluate unit cooling capacity and performance.

• Temperature difference should be 4 C to 6 C (7.2 F to 10.8 F).

• Open evaporator door. Inspect coil for ice or frost and initiate manual defrost if necessary.

• Check refrigerant charge.

• May occur during any defrost.

• Heat signal has been on for too long.

• Time limit is 90 minutes with supply voltage above 440VAC and 120 minutes below 440VAC.

• Indicates:

  • Low power supply voltage.

  • Defective heater elements.

  • Evaporator fans running during defrost.

  • Evaporator sensor placed wrong.

• Initiate a manual defrost and check amperage draw and evaporator coil temperature. Evaluate defrost performance.

• Open evaporator door and check location of evaporator coil sensor.

• Occurs during pretrip (PTI) test only.

• Difference between supply and return air temperature is too small with high speed evaporator fans (less than approximately 4.5 C [8 F]).

• When the return air temperature does not reach -18 C (0 F) within preset time.

• Indicates:

  • Incorrect location of supply or return air sensor.

  • Air leakage at supply sensor cable.

  • Defective supply or return air sensor.

  • Interchanged sensor connections.

  • Incorrect evaporator fan rotation or high speed operation.

  • Incorrect refrigeration system operation.

  • Container/side panels defective, damaged or leaking.

  • Economizer circuit defective.

• Enter Manual Function Test and start evaporator fans on high speed and let operate fans for 5 minutes. Check supply, return and evaporator coil (defrost) sensor temperatures. Sensor readings should be the same (evaporator coil may be 0.5 C [1.0 F] lower due to fan motor heat).

• Open evaporator door and inspect evaporator fan rotation. Make sure fans are rotating correctly on high speed.

• Check the sensor connections.

• Enter Manual Function Test menu. Start and check current draw of the following components separately and together: compressor, vapor on, condenser fan and evaporator fans (high). Check discharge and suction pressure readings. Also check the refrigerant charge.

• Occurs during pretrip (PTI) test only.

• When the supply air temperature does not reach 0 °C (32 F) within preset time.

• Indicates:

  • Incorrect location of supply air sensor.

  • Air leakage at supply sensor cable.

  • Defective supply air sensor.

  • Interchanged sensor connections.

  • Incorrect evaporator fan rotation or high speed operation.

  • Incorrect refrigeration system operation.

  • Container/side panels defective, damaged or leaking.

  • Air exchange vent open too much.

  • Low refrigerant charge.

  • Cooling circuit defective.

• Enter Manual Function Test and start evaporator fans on high speed and let operate fans for five minutes. Check supply, return and evaporator coil (defrost) sensor temperatures. Sensor readings should be the same (supply air may be 0.5 °C [1.0 F] higher due to fan motor heat).

• Open evaporator door and inspect evaporator fan rotation. Make sure fans are rotating correctly on low and high speed.

• Check the sensor connections.

• Enter Manual Function Test menu. Start and check current draw of the following components separately and together: compressor, vapor on, condenser fan and evaporator fans (high). Check discharge and suction pressure readings. Also check the refrigerant charge.

• Occurs during pti, brief pti and function tests.

• Power consumption does not increase when activating economizer valve.

• Current consumption not correct for valve position.

• Enter Manual Function Test and start compressor and evaporator fans on high speed, with digital valve off, operate vapor injection valve and observe current consumption change. An increase in current consumption is expected.

• Check vapor valve function.

• Evaluate economizer Tx valve operation.

• If low pressure switch is mounted.

  • The switch is OPEN.

• If pressure transducer is mounted.

  • The suction pressure has been measured below -0,27BarR and has not yet increased above +0,38BarR.

• Indicates:

  • Low refrigerant charge.

  • Refrigeration system restriction at filter drier or expansion valve.

  • Defective low pressure cutout switch.

  • Defective low pressure transmitter.

• Check discharge and suction pressure gauge readings:

  • If refrigerant pressures are low, check for a restriction and leak check the refrigeration system.

  • If refrigerant pressures are high, check for a high refrigerant charge (see below).

• Check for a restriction:

  • Check for frost on downstream side of the filter drier.

  • Check for high evaporator superheat using supply air sensor temperature readings in Data menu or a frost pattern on expansion valve side of the evaporator coil. A large temperature difference between the left hand and right hand supply air sensors indicates a possible evaporator restriction or incorrect superheat.

• If low pressure switch is mounted:

  • Check low pressure cutout switch wiring.

  • Measure the voltage across the switch, located at J1A pin 15 and 17.

    • Switch closed (normal) voltage is 0VDC.

    • Switch open (LPCO) voltage is approx. 12VDC.

  • Replace switch.

• If pressure transducer is mounted:

  • Measure the transducer supply voltage at J1A pin 5 related to J1A pin 9 (GND). Expect to be approximately 5 Vdc.

  • Measure the transducer output voltage at J1A pin 7 related to J1A pin 9 (GND). Expect to be above 0.5 Vdc (0 BarR = 0.8 Vdc).

• When the sensor circuit resistance is above 1785Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3B pin 2 and 4.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this pt1000 sensor is -100°C (602Ω) +200°C (approx 1758Ω).

• When the sensor circuit resistance is below 602Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3B pin 2 and 4.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +200°C (approx 1758Ω).

• When the sensor circuit resistance is above 1785Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3B pin 6 and 8.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +200°C (approx 1758Ω).

• When the sensor circuit resistance is below 602Ω.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check sensor connections at controller.

• The sensor is a PT1000 – 2 wire sensor, connected to the MP-5000 at connector J3B pin 6 and 8.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

  • The sensor can not be examined without disconnecting it.

  • The electrical resistance towards chassis must be above meg ohm (MΩ) range.

• The sensor is a PT1000 – positive temperature coefficient, which means that the electrical resistance of the sensor increases with temperature.

  • The sensor is defined to be 1000Ω@ 0°C.

  • Normal condition measuring with disconnected sensor is 960Ω@-10°C, 1000Ω@0°C, 1039Ω@+10°C, 1058Ω@+15°C, 1078Ω@+20°C.

  • The valid measuring limit for this PT1000 sensor is -100°C (602Ω) +200°C (approx 1758Ω).

• Occurs during defrost.

• With dehumidify operation; during defrost the return air temperature increases above 38 °C (100 F).

• Indicates:

  • Defective return or evaporator coil sensor.

  • Return and evaporator coil sensor connections are reversed.

• Check for sensor alarm codes.

• Check supply and return sensor connections and locations.

• Occurs during Normal Run only.

• Only active with the surveillance active (OOCL option)

• During dehumidify operation or if ambient air temperature is below set point:

  • If return air temperature is below set point -3C.

• Else (other operation range):

  • If return air temperature is below set point -1C.

• The alarm state has to be present for 15 minutes before the alarm is set.

• Indicates:

  • Container/side panels defective, damaged or leaking.

• Using DATA menu to evaluate sensors.

• Use PROBE TEST to help determine the problem.

• Replace sensor.

• Shutdown Alarm

• Occurs if line voltage has been below 330VAC and is below 340 volts for 30 minutes.

• During the 30 minutes and until voltage gets back above 340VAC the compressor is stopped, for protecting the unit.

• Indicates:

  • Poor power supply.

• Using DATA menu to evaluate the power line quality.

• Refer to the electrical specifications in the Specifications Section for correct power requirements.

• Occurs during pretrip (PTI) test or probe test in Chilled mode.

• Temperature difference between supply and return air is above 1,5C and the system is not capable of pinpointing which probe is failing.

• Temperature difference between supply and return air and evaporator coil is above 1,5C and the system is not capable of pinpointing which probe is failing.

• Indicates:

  • Sensor error.

  • Sensor misplacement.

• Using MANUAL FUNCTION TEST, ventilate with evaporator fan high speed and evaluate the readings.

• Check sensor connections.

• Replace sensor.

• Check sensor.

• Occurs during pretrip (PTI) test only.

• Compressor does not stop during high pressure cutout switch test.

• Indicates:

  • Faulty compressor contactor or control circuit.

  • Low refrigerant charge.

  • Defective high pressure cutout switch.

  • Strong winds causing cooling of condenser coil in low ambient conditions.

• Check discharge and suction pressure gauge readings and check refrigerant charge.

• Enter Manual Function Test menu.

  • Start the following components together: compressor 100 percent, compressor and evaporator fans (high). Discharge pressure should increase and compressor should stop at 2250 kPa, 22.5 bar, 326 psig (high pressure cutout switch opens).

• Occurs during pretrip (PTI) test only.

• Compressor does not start within normal time during high pressure cutout switch test.

• Indicates:

  • High pressure cutout switch did not respond to pressure change within five seconds.

  • Air in refrigeration system.

  • Defective high pressure cutout switch.

• Check discharge and suction pressure gauge readings.

• Enter Manual Function Test menu.

  • Start the following components together: compressor 100 percent, compressor and evaporator fans (high). Discharge pressure should increase and compressor should stop at 2250 kPa, 22.5 bar, 326 psig (high pressure cutout switch opens).

  • Then start condenser fan. Discharge pressure must drop quickly (10 to 20 seconds) to 1550 kPa, 15.5 bar, 225 psig and compressor should start (switch closes).

• Shutdown Alarm

• Compressor discharge line temperature is above 148 C (298 F). Compressor stopped until discharge line temperature decreases to normal.

• Indicates:

  • Air in refrigeration system.

  • Low refrigerant charge.

  • Defective compressor.

  • Defective vapor injection.

• Operate unit on Cool and check discharge and suction pressure gauge readings.

• Enter Manual Function Test menu and test (operate) Vapor Injection Valve to determine if valve opens (energizes).

• Check compressor discharge sensor resistance. Resistance must be approx. 86,000 ohms at 25 C (77 F).

• Check discharge line temperature with a separate electronic thermometer and compare to “HIGH PR TEMP” shown in the Data menu of controller.

• Occurs during pretrip testing if the expected door endpoints can’t be reached.

• Occurs during normal operation.

  • If the TK Fresh Plus module isn’t detected.

  • During door position calibration the expected door endpoints feedback can’t be reached.

  • During pulsing movement the expected door end points feedback can’t be reached.

• Indicates:

  • Stocked air vent. door motor.

  • Failing or missing TK Fresh Plus module.

• Inspect TK Fresh Plus module connection to the controller.

• Using STATES MENU / EXPANSION MODULE to inspect the observed presence and readings of the TK Fresh Plus module. If the module is not found use the tester to decide the problem.

  • From backside left bay is bay 1

  • From backside right bay is bay 2

• Inspect wiring from TK Fresh Plus motor to TK Fresh Plus module.

• Using MANUAL FUNCTION TEST move and Inspect air vent door movement.

• Inspect air vent.

• Replace TK Fresh Plus motor.

• Occurs during pretrip (PTI) or function test only.

• During Phase Sensor Test, while direction is reversed, the condenser fan and compressor is tested.

  • If the current consumption of the condenser fan is below 0,5A on each phase.

  • If the current consumption of the compressor is below 2,0A on each phase.

• Indicates:

  • Defective phase relay.

  • Defective controller.

• Start a Manual Function Test. With reverse phase direction selected, check the condenser fan runs reversed direction and the compressor is activated and makes loud noise. Allow only for short time activation max. 5 sec.

• 100% ampere difference between current phases, max reading must be above 1,5A.

• The alarm is protected by a timer which demand the state to be present for three minutes before the alarm is set.

• Indicates:

  • Open connection on one phase of power supply to a motor or heater element.

  • Blown fuse.

• Enter Manual Function Test menu and test (operate) each 3-phase component to locate defective connection.

• Check fuses.

• Occurs during Pre-Trip (PTI) test:

  • The last defrost must be more than 5 minutes away and Return Air Temperature must be above -1C to allow for the alarm to be set.

  • 4-20mA Humidity sensor type: Relative humidity reading is less than 15%.

  • Modbus sensor type: Modbus communication with the sensor is lost for 3 retries.

• Occurs during:

  • The unit mode must be chilled, The humidity control set to ON, the last defrost must be more than 5 minutes away and Return Air Temperature must be above -10C to allow for the alarm to be set.

  • 4-20mA Humidity sensor type: Relative humidity reading is less than 15%. Error must be persistent for 60 minutes.

  • Modbus sensor type: Modbus communication with the sensor is lost for 11 retry equals approximately 5 minutes.

• Indicates:

  • Sensor disconnected.

  • Wrong controller configuration, sensor might be disconnected or removed.

  • Defective sensor.

• If the alarm occurs together with the ‘Sensor System Overload” alarm 137, the sensor input might be short circuit.

• Check sensor connections.

• Check controller configuration menu for correct humidity setting.

• Replace sensor.

• When the sensor circuit resistance is above 1MΩ and the ambient air temperature is above -10°C.

  • Since the sensor is a NTC-type, readings above 1MΩ will occur when the temperature is below approximately -25°C.

• Indicates:

  • Open circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check for sensor connections at controller.

• The compressor temperature sensor is a NTC – 2 wire sensor. The sensor is located/connected to the MP-5000 at connector J2B pin 6 and 8.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

• The sensor can’t be examined without disconnecting it.

• The electrical resistance towards chassis must be above mega ohm (MΩ) range.

• The sensor is a NTC thermistor type - negative temperature coefficient, which in this case means that the resistance of the sensor decreases with temperature.

  • The sensor is defined to be 86000Ω@ 25°C.

  • Normal condition measuring with disconnected sensor is:

    • 475kΩ@-10°C

    • 280kΩ@0°C

    • 171kΩ@+10°C

    • 135kΩ@+15°C

    • 107kΩ@+20°C

  • The valid measuring limit for this sensor is -25°C (approx. 1MΩ) +185°C (approx. 550Ω).

• When the sensor circuit resistance is below 550Ω.

• Indicates:

  • Short circuit.

  • Defective or wrong sensor.

  • Defective wiring.

  • Defective controller.

• Check for damaged sensor wires.

• Check for sensor connections at controller.

• The compressor temperature sensor is a NTC – 2 wire sensor. The sensor is located/connected to the MP-5000 at connector J2B pin 6 and 8.

• The 2 sensor wires can be switched without affecting the measurement.

• Disconnect the sensor, use an Ohm (Ω) measuring device, measure the electrical resistance between the two sensor wires.

• The sensor can’t be examined without disconnecting it.

• The electrical resistance towards chassis must be above mega ohm (MΩ) range.

• The sensor is a NTC thermistor type - negative temperature coefficient, which in this case means that the resistance of the sensor decreases with temperature.

  • The sensor is defined to be 86000Ω@ 25°C.

  • Normal condition measuring with disconnected sensor is:

    • 475kΩ@-10°C

    • 280kΩ@0°C

    • 171kΩ@+10°C

    • 135kΩ@+15°C

    • 107kΩ@+20°C

  • The valid measuring limit for this sensor is -25°C (approx. 1MΩ) +185°C (approx. 550Ω).

• Occurs during Pre-Trip (PTI) test if:

  • Compressor Current consumption is not correct for valve position.

• Occurs during normal run.

  • If unit operation indicates problem with the modulation of the compressor cooling capacity.

  • The compressor startup is tested for power consumption change based on activating modulation for the compressor.

  • The change from un-loaded to loaded must increase the power draw more than 0,6A.

• With this alarm NOT ACKNOWLEDGED, the unit will offset the regulation temperature set point +1,5C (up), to compensate for low temperature peaks.

• Using Manual Function Test, without compressor and fans active check the function of the valve by observing the sound or feel of the valve while activating/deactivating.

• Using Manual Function Test, with compressor and fans active check the function of the valve.

  • The current consumption during NOT energized valve must be higher than during energized position.

  • With Condenser coil temperature above 35C the expected increase is min 0,9A and below 35C expected limit is 1,5A.

• Occurs during Normal Run if the sensor is detected to be out of range, open or short circuit.

• Occurs during Pre-Trip (PTI) test if the sensor readings do not act correct during compressor activity.

  • Expected to decrease 0,15Bar from stopped to compressor running loaded.

• Indicates:

  • Wrong location of the sensor.

  • Sensor failure.

• Using DATA menu evaluate sensor readings.

• Check wiring to be correct and connected.

• Check voltage at J1A pin 7 to be 0.5 to 4.5 Vdc.

• Replace sensor.

• Occurs during Normal Run if the sensor is detected to be out of range, open or short circuit.

• Occurs during Pre-Trip (PTI) test if the sensor readings do not act correct during compressor activity.

  • Expected to decrease 0,15Bar from stopped to compressor running loaded.

• Indicates:

  • Wrong location of the sensor.

  • Sensor failure.

• Using DATA menu evaluate sensor readings.

• Check wiring to be correct and connected.

• Check voltage at J1A pin 7 to be 0.5 to 4.5 Vdc.

• Replace sensor.

• In cold ambient if the battery heater (battery internal) is not capable of heating up the battery, ready for charging within 2 hours.

• If the battery is not connected.

• If the battery voltage is below 3.0VDC.

• Using DATA menu to determine the state of the battery. Evaluate temperature and voltage.

• Check the battery physically, dismount and examine wires and the connection to the controller.

• Replace battery.

• Occurs during Normal Run and only with cold Treatment active.

• Only active with the surveillance active (OOCL option)

• Indicates:

  • Cold treatment period is restarted due to temperatures.

  • Problem with cooling process

  • Too long duration of power off.

• Unit will automatically restart the treatment period.

• The surveillance has determined that the unit is not capable of continue running, and has shut down.

• The reason is displayed at the controller main screen, and is stated at the event next to the alarm event.

• Known reason to the shutdown state is:

  • "SET POINT OUT OF RANGE"

  • "VOLTAGE OUT OF RANGE"

  • "POWER LINE PHASE ERROR"

  • "REGULATION PROBE ERROR"

  • "COMPRESSOR TEMPERATURE HIGH"

"SET POINT OUT OF RANGE"

• The temperature set point is outside valid operation range. +30°C to -40°C (+35°C with extended range).

• Check configurations and settings on the controller.

"VOLTAGE OUT OF RANGE"

• The measured voltage is below 330VAC.

• Check power line voltage while loaded.

"POWER LINE PHASE ERROR"

• The phase detection system detects phase error or not capable of securing the correct rotation.

• Check power line voltage and quality.

"REGULATION PROBE ERROR"

• If supply and return air temperature sensor and evaporator coil temperature sensors ALL indicate OPEN or SHORT circuit, the software is not capable of determine a reasonable action related to the cargo.

• Following steps related to the sensor alarms.

"COMPRESSOR TEMPERATURE HIGH"

• The compressor temperature is measured to be above 148°C. The state will stay until compressor temperature is measured to be below 132°C.

• Check refrigerant level and flow through the cooling circuit.

• Occurs during Pre-Trip (PTI) test and probe test only.

• After ventilation with the evaporator fans.

• If the supply and return air temperature sensor differs more than 1,5C and the return air temperature is within 1,5C of evaporator coil temperature.

• If evaporator coil temperature sensor is failing, if the supply and return air temperature sensors differs more than 1,5C. Both alarm 129 and 128 will be set.

• Indicates:

  • Failing sensors.

  • Misplaced sensors.

  • Failing controller.

• Use the DATA menu to detect the failing sensor.

• Replace sensors.

• Use the tester to determine the problem.

• Occurs during Pre-Trip (PTI) test and probe test only.

• After ventilation with the evaporator fans.

• If the supply and return air temperature sensor differs more than 1,5C and the supply air temperature is within 1,5C of evaporator coil temperature.

• If evaporator coil temperature sensor is failing, if the supply and return air temperature sensors differs more than 1,5C. Both alarm 129 and 128 will be set.

• Indicates:

  • Failing sensors.

  • Misplaced sensors.

  • Failing controller.

• Use the DATA menu to detect the failing sensor.

• Replace sensors.

• Use the tester to determine the problem.

• Occurs during Pre-Trip (PTI) test and probe test only.

• After ventilation with the evaporator fans.

• If the evaporator coil temperature differs more than 1,5C from the mean value of supply and return air temperature.

• Indicates:

  • Failing sensors.

  • Misplaced sensors.

  • Failing controller.

• Use the DATA menu to detect the failing sensor.

• Replace sensors.

• Use the tester to determine the problem.

• Occurs during Pre-Trip (PTI) test and probe test only.

• After ventilation with the condenser fan.

• If the ambient air and condenser coil temperature sensor readings differs more than 2.5C.

• Indicates:

  • Failing sensors.

  • Misplaced sensors.

  • Failing controller.

• Use the DATA menu to detect the failing sensor.

• Replace sensors.

• Use the tester to determine the problem.

• The surveillance continually evaluates the measurements reported by the current transmitter and/or controller.

• The surveillance includes a timer with a timeout at 60 seconds before the alarm is set.

• Indicates:

  • Current transmitter and/or controller module located readings outside allowed range.

• Use DATA menu to determine the failing reading.

• The accepted limit for:

  • Line AC voltage is 180 to 700VAC.

  • Power line current is 0mA to 32A.

  • Radiator temperature is -100C to 200C.

• Check for latest software revision.

• Use tester to determine the problem.

• The surveillance has determined the state “controller internal error”.

• Indicates:

  • The controller is failing one way or another.

• Use the tester to determine the problem.

• The controller is not capable of generating the expected voltage for the 12V LPCO and transducer sensors, (suction pressure and discharge pressure, AVL and humidity sensor).

• Replace Data logger Battery.

• Use the tester to determine the problem.

• The controller sensor measurement is overloaded.

• This situation will probably introduce wrong readings at other sensors than the one introducing the overload.

• Indicates:

  • Not intended voltage is introduced at one of the sensor inputs.

  • Transducer, connection or cabling with voltage supply for the sensor might short circuit this voltage supply onto the measuring input.

• Sensor input which might initiate the problem:

  • At connector J1A:

    • Humidity sensor (4-20mA type) pin 1 and 3.

    • Suction pressure pin 5, 7, and 9.

  • At connector J1B:

    • AVL position pin 2, 4, and 6.

    • Discharge pressure pin 8, 10, and 12.

• At least one of the sensors circuits holds a short between sensor voltage and sensor signal.

• Problem might be located any were from the connection to the sensor itself.

• Action:

  • Disconnect sensors and look for a non intended short between sensor voltage and the sensor line.

  • The sensor with the problem might show up with its own alarm.

• Occurs if the sensor is detected to be out of range, open or short circuit.

• Indicates:

  • Sensor failure.

• Using DATA menu evaluate sensor readings.

• Check wiring to be correct and connected.

• Check voltage at J1B pin 4 to be 0.5 - 4.5 Vdc.

• Check supply voltage at J1B pin 6 (GND) to pin 2 to be approximately 12.6 Vdc.

• Replace sensor.

• Occurs if the read or write process of nonvolatile information (i.e., Configuration and settings) fails.

• Indicates:

  • Internal file read or write failure.

• Replace controller.

• Occurs if supply air, return air or evaporator coil temperature reads temperature at or above 60C.

• Indicates:

  • Failing heater circuit, hanging output.

  • Failing evaporator fan.

• Observe temperature readings to locate the problem.

• Use manual function test to determine the failing component.

• Use the tester to determine the problem.

• Firmware version 3.3.0 or newer:

  • Occur if the battery is connected and the battery protection circuit is activated as a result of overcurrent, over-charge or over-discharge.

  • Battery voltage must stay below 2.5V after the battery has been charged for three minutes.

• Check the battery physically, dismount and examine wires and the connection to the controller.

• Replace battery.