Schneider Electric Altivar Machine ATV320 fault OLF: Motor overload
OLF on a Schneider Altivar ATV320 is a motor overload error: the drive’s motor thermal protection tripped because of excessive motor current. Schneider’s remedy is to check the thermal protection setting and the motor load, and let the motor 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 long running at high load
- On repeated starts or heavy duty cycles
- After motor settings were changed
Likely causes and checks
1Motor mechanically overloaded
- Points to it
- Current above the rating plate; process or machine load increased.
- Check
- Measure motor current and inspect the driven machine.
2[Motor Th Current] ITH set wrong
- Points to it
- OLF with a normal-feeling motor, after commissioning or a motor change.
- Check
- Check ITH against the motor rating plate current (range 0.2 to 1.5 In).
3Motor cooling poor
- Points to it
- Motor runs hot; fan cover blocked or dirty.
- Check
- Check the motor fan and surface; check the motor thermal state (THR) in the error record (THP1).
Telling it apart
- OLF is the motor model; OHF and TJF are drive overheating; OLC is a process overload function.
- OTFL is from a real PTC probe on DI6, not the calculated model.
- OLF can be cleared by ATR or RSF once the cause is gone; wait for the motor to cool first.
Relevant parameters
| Parameter | Name | Why it matters |
|---|---|---|
| ITH | Motor Th Current | Motor thermal current, 0.2 to 1.5 In; set from the motor rating plate. |
Evidence to collect
- Error history record with motor current and thermal state
- ITH setting vs rating plate
- Clamp-meter motor current
- Duty cycle
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