Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
CPU abnormal operation detected.
Possible Causes
- CPU hardware failure
- Firmware corruption
- Severe EMI disturbance
Troubleshooting Steps
- Step 1: Power cycle the drive
Fault may clear if transient - Step 2: Check for EMI sources near drive
No interference sources - Step 3: Replace control board if fault persists
New board initializes correctly
How to Reset
Power cycle; replace control board if fault persists.
Source: ABB ACS510/550 User Manual, ABB Drives
Category: PLC & VFD