Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
DC link undervoltage detected.
Possible Causes
- Input voltage too low
- Input phase loss
- Main contactor drop-out
Troubleshooting Steps
- Step 1: Measure input voltage on all phases
Voltage within rated range - Step 2: Check input fuses and contactor
Fuses intact, contactor engaged - Step 3: Verify DC link voltage
Voltage above undervoltage threshold
How to Reset
Reset via control panel after voltage normalizes.
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Source: ABB ACS510/550 User Manual, ABB Drives
Category: PLC & VFD
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