F43

Motor Phase VW Short Circuit

Allen-Bradley · PowerFlex 40 Adjustable Frequency AC Drive

What does F43 mean?

This fault detects a short circuit condition between motor phases V and W at the drive output. This implies an insulation failure within the motor windings or a direct short in the cabling connecting the drive to the motor.

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)