F0078 fault in WEG CFW500 Drive

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F0078 fault in WEG CFW500 Drive indicates Motor Overtemperature via AI/DI. This means an external thermistor connected to the control terminals has detected that the motor is dangerously hot. 

Cause:

  • Overload on the motor shaft.
  • High start/stop duty cycle.
  • High ambient temperature around the motor.
  • Poor contact or short-circuit (3k9 < RPTC < 0k1).
  • Motor thermistor is not installed.
  • Motor shaft is stuck.


Remedy:

Check the motor shaft and driven load for mechanical blockages. Optimize duty cycles. Measure thermistor circuit resistances and secure connections.

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