INPUT PHASE LOSS

What does PHF mean?

This fault signifies that the drive is incorrectly supplied, has a blown fuse on one phase, or is a three-phase ATV312 unit mistakenly used on a single-phase line supply. It can also be caused by an unbalanced load and typically only operates when the drive is under load. Unresolved input phase loss can lead to drive component stress, rectifier failure, and prevents proper operation.

Complete Troubleshooting Guide

1. 1

   Check the power connection to the drive and inspect all input fuses for continuity.

2. 2

   Perform a drive reset after addressing the power supply issue.

3. 3

   Ensure a three-phase line supply is used for three-phase drives; do not operate three-phase drives on single-phase lines unless specifically rated for it.

4. 4

   If necessary for specific applications (e.g., lightly loaded motors), disable the detection by setting [Input phase loss] (IPL) = [No] (nO) in the [FAULT MANAGEMENT] (FLt-) menu (page 94), but use with caution.