Old Hand Fault Finder

Allen-Bradley PowerFlex 525 F002: Auxiliary Input

What it means An external trip (auxiliary) input told the drive to stop.

✓ Checked against the manual (Oct 2026): meaning and actions match the official fault table. Manual page.

Likely causes

  • Opened safety/interlock contact wired to an input set as aux fault
  • Wrong input configured
  • Loose wire

Checks, in order

  1. Find which input is set as aux fault
  2. Check that remote wiring
  3. Check communication programming for an intentional fault

Old Hand tip

Nine times out of ten it's a door switch or E-stop chain, not the drive.

Source

Source (reworded, not copied): Rockwell Automation, PowerFlex 520-Series AC Drives User Manual, publication 520-UM001O-EN-E (September 2025), Chapter 4 Troubleshooting, PDF page 161. Official manual (PDF). Fault numbers and names can differ between firmware versions.