Earth fault

What does F00021 mean?

An earth fault has been detected, indicating an insulation breakdown where current is flowing to ground. This occurs when the sum of the phase currents exceeds 5% of the inverter's nominal current, potentially causing personnel hazard, equipment damage, or fire if left unresolved.

Complete Troubleshooting Guide

1. 1

   Check motor and cable insulation for signs of damage or moisture ingress.

2. 2

   Measure insulation resistance of the motor and cables to ground using a megger.

3. 3

   Inspect the grounding connections of the motor and inverter for integrity.