Old Hand Fault Finder

ABB ACS580 9081: External fault 1

What it means A fault was signaled by external device 1.

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

Likely causes

  • Device wired to the external event 1 input tripped

Checks, in order

  1. Check the external device
  2. Check parameter 31.01 External event 1 source

Source

Source (reworded, not copied): ABB, ACS580 Standard Control Program Firmware Manual, 3AXD50000016097 Rev J (2025-10-01), Fault tracing, PDF page 562. Official manual (PDF). Fault numbers and names can differ between firmware versions.