Earth Fault / Excessive Capacitive Charging Current

What does OC2 mean?

An earth fault has been detected, potentially due to a grounded motor phase or excessive capacitive charging current in the motor cable. This indicates a breakdown in insulation within the motor or its cables, or spurious signals from long, high-capacitance cables. An earth fault poses an electrical safety hazard, can damage the drive's output stage, and cause nuisance trips.

Complete Troubleshooting Guide

1. 1

   Disconnect the motor from the drive and perform an insulation resistance test (megger test) on each motor phase to ground, and between phases.

2. 2

   Inspect the motor cable for any damage, abrasions, or moisture ingress that could lead to a ground fault.

3. 3

   If using long motor cables, consider shortening them or replacing them with low-capacitance motor cables suitable for inverter duty.