963 StarCool Alarm Codes And Actions

963 Psuc sens sup LO
Description Controller Internal Voltage Reference Fault
Cause Indication of controller internal voltage reference fault
Trouble
shooting		 Possible causes:
  • Defective power supply for main controller.
  • Defective Psuc pressure transmitter.
  • Defective main controller.
Accompanied alarms:
  • There may be sensor alarms, especially AL 207.
  • AL 801 will be activated during FT- or PTI test.
Trouble shooting:
  1. Check if there are other active (sensor) alarms. Clear these alarms fi rst using their trouble shooting.
  2. Access the “special menu” by pressing "spanner icon" for more than 3 sec. Scroll down until you see the label “U Psuc” in the display. The value of “U Psuc“ should be in the range between 4.80 and 5.2V DC.
  3. While displaying “U Psuc“, remove the connector at Psuc. − If “U Psuc” is now inside the correct above range (4.80 – 5.2 V DC), the Psuc pressure transmitter is defective. Replace the Psuc pressure transmitter. − If “U Psuc” is still outside the above range, proceed to next step.
  4. While displaying “U Psuc“, disconnect Pdis from the terminals according to wiring schematics inside in the control cabinet. − If “U Psuc” is now inside the above range the cable for Psuc is defective. Mount connector correctly or replace connector cable for Psuc. − If the correct voltage is measured at X22 then circuit is defective.
Replace the main controller.
Criteria Reference voltage Psuc below 4.80V DC

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