Delta · MS300Fault Code oLWarning
Delta MS300 — oL Drive Overload
The drive trips protectively when current exceeds the allowed overload curve. Increased mechanical load or wrong sizing is the cause.
Updated: 2026-07-05
Symptoms
- oL as load increases
- Gradual heat-up then trip
- Recurs at a specific operating point
Probable Causes
- Mechanical overload / jam
- Drive undersized for the motor
- Wrong torque boost / V/F setting
Checkpoints
- Measure mechanical load and current
- Verify drive-motor power match
- Check bearing/transmission resistance
Solution
First check the mechanical system (bearings, belt, gearbox). If load is normal, review sizing and parameters.
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