Old Hand Fault Finder

Allen-Bradley PowerFlex 525 F040: Phase W to Gnd

Cites the manual · line-by-line check pending

What it means Ground fault found on output phase W.

Likely causes

  • Insulation failure on W lead or winding

Checks, in order

  1. Megger W lead and winding

Source

Source (reworded, not copied): Rockwell Automation, PowerFlex 520-Series AC Drives User Manual, publication 520-UM001O-EN-E (September 2025), Chapter 4 Troubleshooting. Official manual (PDF). Fault numbers and names can differ between firmware versions.