Phase U to Grnd

What does 38 mean?

A phase-to-ground fault has been detected between the drive and the motor on output phase U. This indicates insulation breakdown or a direct short from output phase U to earth. This condition poses a significant risk of electrical shock and can cause severe damage to both the drive and the motor if not quickly identified and resolved.

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.