Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
Main contactor fault detected.
Possible Causes
- Main contactor coil failure
- Contactor contacts worn
- Contactor control circuit fault
Troubleshooting Steps
- Step 1: Check main contactor coil resistance
Coil within rated resistance - Step 2: Inspect contactor contacts
Contacts clean and not pitted - Step 3: Verify contactor control circuit
Control voltage present
How to Reset
Reset via control panel after contactor repair.
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Source: ABB ACS510/550 User Manual, ABB Drives
Category: PLC & VFD
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