Phase WNegToGrnd

What does 46 mean?

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

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

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