F38

Motor Phase U to Ground Fault

Allen-Bradley · PowerFlex 40 Adjustable Frequency AC Drive

What does F38 mean?

This fault indicates a grounded condition on motor phase U (output terminal U) between the drive and the motor. This usually points to insulation breakdown in the motor winding or the connecting cable.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    If the fault persists after verifying wiring and motor integrity, replace the drive.

Source: Allen-Bradley PowerFlex 40 Adjustable Frequency AC Drive
Open Manual (Page 17)