Input Phase Loss

What does PHF mean?

Detection of a loss of one or more phases in the main input power supply to the drive. This causes unbalanced operation, potentially damaging the drive's input rectifiers or internal DC bus capacitors. The drive will trip to protect itself and upstream equipment.

Complete Troubleshooting Guide

1. 1

   Check the incoming three-phase power supply connections to the drive for loose or broken wires.

2. 2

   Verify that all phases of the incoming mains power are present and balanced using a voltmeter.

3. 3

   Inspect upstream circuit breakers, fuses, or contactors for tripped states or damage.

4. 4

   Ensure the mains power supply is stable and free from voltage sags or interruptions.