207 StarCool Alarm Codes And Actions

207  Psuc invalid
Description Compressor Suction Pressure transmitter Invalid
Cause Indication of defective compressor suction pressure transmitter or its measuring circuitry
Trouble
shooting		 Possible causes:

  • Connector for suction pressure transmitter Psuc not correctly mounted.
  • Suction pressure transmitter Psuc defective.
  • Cable for suction pressure transmitter Psuc defective.
  • Check Schrader valve.
  • X22 and cable is defective.
  • Main controller defective.

Trouble shooting:

Compare pressure in display with service gauge. Disconnect the cable for Psuc on the main controller according to the wiring schematics inside the control cabinet and from the suction pressure transmitter.

  1. Try to correct the error by uploading the latest software version to the controller.
  2. Check that the connector is mounted correctly according to the drawing for pressure transmitter AKS or NSK respectively.


The earth stud must be on the opposite side of the cable (AKS):
                           Figure for AKS                   Figure for NSK

3. Check the cable (measure the resistance in the cable). If the cable is defective, replace cable.
4. Mount the cable for Psuc in controller cabinet and on the transmitter. Disconnect signal wire on main controller. Measure voltage between wire and GND on main controller. AKS: If voltage is below 0.5 V DC, transmitter or connection between transmitter and cable is defective. If voltage is between 0.5 V DC and 4.5 V DC, continue to
5). NSK: If voltage is below 0.37 V DC, transmitter or connection between transmitter and cable is defective. If voltage is between 0.37 V DC and 4.0 V DC, continue to 5). 5. Mount signal wire. Measure voltage between SIGNAL and GND. AKS: If voltage is between 0.5 V DC and 4.5 V DC and this alarm is still active, replace main controller. NSK: If the voltage is between 0.37 V DC and 4.0 V DC and this alarm is still active, replace main controller.
6. Before replacing main controller see “16.1 Trouble shooting for Star Cool main controller” p. 60
Criteria Value below alarm limit -0.9 BarE (-13 Psi) or above 11.8 BarE (171 Psi). Value invalid for 30 sec. for alarm activation.
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