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What causes an OL2 fault on the ATV21 and ATV212 drives?
Altivar ATV21 and ATV212
OL2 indicates the drive is detecting a Motor Overload fault.
This will happen when the motor current exceeds the level programmed in the tHr parameter (works the same as a motor overload relay on a motor starter).
High current can be caused by:
Excessive load applied to the motor (motor is too small for the load).
Motor is jammed or stuck (locked rotor condition).
Motor is running a low speed for a long time (reduces the cooling of the fan on the motor).
Incorrect setting of the Pt (Motor Control Mode) parameter.