Line Supply Phase Failure

What does PHF mean?

This fault indicates a loss of one or more phases in the incoming AC line supply to the drive controller, often caused by incorrect wiring, a blown input fuse, or a transient power fault. Operating a three-phase drive on a single-phase supply can also trigger this. Prolonged operation with missing phases can damage the drive's input rectifier.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Perform a fault reset after ensuring the power supply issue has been fully corrected.