Old Hand Fault Finder

Allen-Bradley PowerFlex 525 F015: Load Loss

What it means Output torque current stayed below the Load Loss Level (A490) for longer than the Load Loss Time (A491), as if the load disappeared.

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

Likely causes

  • Broken belt or coupling
  • Dry pump
  • Level or time set too sensitive

Checks, in order

  1. Verify connections between motor and load
  2. Check the process
  3. Verify the A490 and A491 settings

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.