Phase VNegToGrnd

What does 45 mean?

A phase-to-ground fault has been detected between the drive and the motor on output phase V, specifically identifying a negative voltage transient or specific ground path. This indicates insulation breakdown or a short from output phase V to earth. This condition can damage the drive and motor if not quickly addressed, and poses an electrical safety risk.

Complete Troubleshooting Guide

1. 1

   Rotate the U/T1, V/T2, W/T3 motor connections at the drive. If the problem follows the wire (e.g., now a WNegToGrnd fault), suspect a field wiring problem or a motor winding fault.

2. 2

   If the fault remains on phase V after rotating connections, suspect a problem with the drive's output stage for phase V.

3. 3

   Measure the insulation resistance of the motor windings and the motor cable to ground using a megger. Expect values greater than 1 MΩ.