Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
Power module rectifier diode open circuit detected.
Possible Causes
- Rectifier diode failure
- Input power surge damage
- Power module thermal stress
Troubleshooting Steps
- Step 1: Check input rectifier diode continuity
Diodes conduct in forward direction only - Step 2: Inspect for thermal damage on rectifier
No burn marks - Step 3: Replace power module if diode is open
New module operates correctly
How to Reset
Power cycle; replace power module if fault persists.
Source: ABB ACS580 Firmware Manual
Category: PLC & VFD