Applicable Systems
Modicon M221
Modicon M241
Modicon M251
Modicon M340
Modicon M580
Altivar
Symptoms
Undervoltage fault: mains voltage too low.
Possible Causes
- Mains voltage too low
- Transient voltage dip
- Input phase loss
Troubleshooting Steps
- Step 1: Measure mains voltage
Voltage within rated range - Step 2: Check for transient dips
Voltage stable - Step 3: Verify all input phases
All phases present
How to Reset
Reset via control panel after voltage normalizes.
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Source: Schneider Electric ATV320 Programming Manual
Category: PLC & VFD
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