508 StarCool Alarm Codes And Actions

508  Compr connection
Description FC Short Circuit Alarm
Cause Indication of defective “cable”, compressor motor or FC
Trouble
shooting		 Possible causes:

  • Short-circuit on the FC power output.
  • Damaged cable and/or plugs.

Trouble shooting:

  1. Try to correct the error by uploading the latest software version to the controller.
  2. There is a short-circuit on the compressor motor (Mcpr) terminals or in the motor. Check the cable and replace if it is defective. Compressor coil resistance: 
V-Y 1.15 Ω
U-X 1.15 Ω
W-Z 1.15 Ω

Also ensure to check to ground Meggering:
Value above 5 MΩ = OK
Value below 5 MΩ = Remove terminal block and measure again on windings directly:

  • If still below, replace compressor
  • If above replace terminal block only

3. The FC is defective and must be replaced. If there is no FC replacement available, the unit can be rewired for emergency operation: See “11. Emergency Operation” p. 54
Criteria Short circuit in compressor or its terminals. Motor current has been above 40 Amp
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