F30021 fault in siemens sinamics V90 drive

F30021 fault in siemens sinamics V90 drive indicates a Ground fault. This means electrical current is escaping to the earth ground, usually caused by damaged insulation on the motor cables or inside the motor windings. 

Cause:
Power unit has detected a ground fault.
  • Ground fault in the power cables.
  • Winding fault or ground fault at the motor.

Remedy:
  • Check the power cable connections.
  • Check the motor.

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