Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
Main power phase loss detected.
Possible Causes
- Missing input phase
- Input fuse blown
- Main contactor fault
Troubleshooting Steps
- Step 1: Measure all three input phases
All phases present - Step 2: Check input fuses
All fuses intact - Step 3: Inspect main contactor operation
Contactor engaged properly
How to Reset
Reset via control panel after restoring input power.
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Source: ABB ACS510/550 User Manual, ABB Drives
Category: PLC & VFD
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