Schneider Electric Altivar Machine ATV320 fault OHF: Drive overheating
OHF on a Schneider Altivar ATV320 is a drive overheating error: the drive temperature is too high. Schneider’s remedy is to check the motor load, the drive ventilation and the ambient temperature, and wait for the drive to cool before restarting.
Diagnose this with AI
Try Free Drive Diagnostic Upload a keypad photo, the fault history or a parameter export from your Schneider Electric Altivar Machine ATV320. InduQT compares the evidence and suggests the next useful checks.
When it happens
- After running loaded for some time
- On hot days or in a poorly ventilated cabinet
- After a fan failure
Likely causes and checks
1Fan failed or worn
- Points to it
- Trips sooner than before; fan noisy or not turning when hot.
- Check
- Check the fan operation. Schneider notes the fan runs according to drive thermal state, so the drive can run with the fan off; replace fans after 3 to 5 years depending on conditions.
2Blocked ventilation or dust
- Points to it
- Dusty site; vents and fans clogged.
- Check
- Inspect and clean terminals, fans and blowholes (Schneider’s maintenance table).
3Ambient temperature too high
- Points to it
- Trips cluster in hot periods; cabinet air hot.
- Check
- Measure the air temperature around the drive.
4Motor load high
- Points to it
- High current for long periods.
- Check
- Check motor load and current against the drive rating.
Telling it apart
- OHF is overall drive temperature; TJF is IGBT overheating (Schneider adds reducing the switching frequency).
- INFB is a faulty drive temperature sensor, not a hot drive.
- OHF can be cleared by ATR or RSF once the drive has cooled.
Evidence to collect
- Error history entry and time of day
- Ambient temperature near the drive
- Fan condition and age
- Motor current at the trip
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