Phase UW Short

What does F42 mean?

An excessive current flow, indicative of a short circuit, has been detected between the drive's output terminals U and W. This typically signifies a phase-to-phase short in the motor windings or the cabling, which can cause severe damage to the motor or drive's output stage if not immediately addressed.

Complete Troubleshooting Guide

1. 1

   Power down the drive and disconnect the motor. Measure resistance between output terminals U and W to check for a short in the motor or cable.

2. 2

   Inspect the motor power wiring for phases U and W for any signs of physical damage, insulation breakdown, or incorrect connections that could lead to a phase-to-phase short.

3. 3

   If the motor and wiring are confirmed to be sound, the fault may lie within the drive's power section; consider drive replacement.