Applicable Systems
AC500
AC590
ACS580
ACS880
Symptoms
Transformer mains current asymmetry detected.
Possible Causes
- Mains supply voltage imbalance
- Transformer winding imbalance
- Loose input connection
Troubleshooting Steps
- Step 1: Measure all three input phase voltages
Voltages balanced within 2% - Step 2: Check input cable connections
All connections tight - Step 3: Inspect transformer winding resistance
All phases balanced
How to Reset
Reset via control panel after mains balance is restored.
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Source: ABB ACS580 Firmware Manual
Category: PLC & VFD
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