Schneider Electric · Altivar ATV320Fault Code OSFWarning
Schneider Altivar — OSF Mains Overvoltage
Occurs when the mains (input) voltage exceeds the allowed upper limit. Weak grids or reactive-compensation issues trigger it.
Updated: 2026-07-05
Symptoms
- OSF at certain hours (low grid load)
- Occurs when compensation switches in
- Trip right at power-up
Probable Causes
- Mains overvoltage
- Capacitor bank/compensation resonance
- Wrong voltage-range setting
Checkpoints
- Measure input voltage at different times
- Assess the compensation system
- Verify the drive voltage class
Solution
For persistently high mains, a line choke or supply regulation is needed. If a measurement-circuit fault is suspected, the board is tested.
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