F0070 fault in WEG CFW500 Drive

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F0070 fault in WEG CFW500 Drive indicates Overcurrent or Short circuit. This means a massive current spike was detected, usually caused by a physical short in the motor phases or aggressive acceleration. 

Cause:

  • Short-circuit between two motor phases.
  • Short-circuit of the rheostatic braking resistor connection cables.
  • IGBTs module is short-circuited or damaged.
  • Drive started with an acceleration ramp that is too short.
  • Drive started with the motor already spinning without using the Flying Start function.


Remedy:

Verify motor winding and connection cables for phase-to-phase shorts. Increase the acceleration ramp time. Enable the Flying Start function if the motor is prone to rotating during startup.

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