oL2 fault Emotron VSB Drive indicates Motor overloaded. This means the motor is drawing current exceeding its rated capacity, triggering the drive’s thermal protection algorithm for the motor.
Possible Causes:
1: Torque boost is too big under V/f control.
2: Inappropriate V/f curve under V/f control.
3: Motor parameters are improperly set.
4: Improper setting of motor overloaded protection time.
5: Motor stalled or sharp variation of load.
6: Long-term running of ordinary motor at low speed with heavy load.
Solutions:
1: Reduce torque boost value.
2: Set V/f curve correctly.
3: Set the parameters correctly according to motor nameplate.
4: Properly set the motor overloaded protection time.
5: Identify the causes of motor stalling or check the load condition.
6: Select variable frequency motor.