429 StarCool Alarm Codes And Actions

429  (Voltage/freq.) U/f ratio
Description Bad power supply
Cause Power generator adjusted to too high voltage/frequency
Trouble
shooting		 Possible causes:

  • Overload of power supply
  • Bad connection in plug

Trouble shooting:

  1. Try to correct the error by uploading the latest software version to the
  2. controller.
  3. Find better cable and or plug
  4. Find failure in the supply system
  5. If no AL 429, watch the unit more often
Criteria Lower limit: Umean is less than (<) 23 + 6.2 * frequency
Upper limit: Umean is more than (>) 155 + 6.2 * frequency
Umean = (U1-2 + U2-3 + U1-3)/3
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