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Causes and corrective actions
(4) Fault
When a fault occurs, the drive unit trips and a fault signal is output.
Operation panel
indication
E.OC1
FR-PU07 OC During Acc
Name
Overcurrent trip during acceleration
Description
When the drive unit output current reaches or exceeds approximately 230% of the rated current during acceleration,
the protective circuit is activated and the drive unit trips.
Check point
Check for sudden acceleration.
Check that the downward acceleration time is not long for the lift.
Check for output short-circuit/ground fault.
Check if the torque limit operation level is set too high.
Check that the drive unit capacity matches with the motor capacity.
Check if a start command is given to the drive unit while the motor is coasting.
Check if the three-phase (U, V, and W) wiring on the output side (load side) of the drive unit is correct. (Check for
phase loss.)
Corrective
action
Increase the acceleration time. (Shorten the downward acceleration time for the lift.)
When "E.OC1" is always lit at starting, disconnect the motor once and start the drive unit.
If "E.OC1" is still ON, contact your sales representative.
Check the wiring to make sure that output short circuit/ground fault does not occur.
Lower the setting of torque limit operation level. (Refer to page 111)
Choose drive unit and motor capacities that match.
Input a start command after the motor stops.
Wire the cables properly.
Operation panel
indication
E.OC2
FR-PU07 Stedy Spd OC
Name
Overcurrent trip during constant speed
Description
When the drive unit output current reaches or exceeds approximately 230% of the rated current during constant
speed operation, the protective circuit is activated and the drive unit trips.
Check point
Check for sudden load change.
Check for output short-circuit/ground fault.
Check if the torque limit operation level is set too high.
Check that the drive unit capacity matches with the motor capacity.
Check if a start command is given to the drive unit while the motor is coasting.
Check if the three-phase (U, V, and W) wiring on the output side (load side) of the drive unit is correct. (Check for
phase loss.)
Corrective
action
Keep load stable.
Check the wiring to make sure that output short circuit/ground fault does not occur.
Lower the setting of torque limit operation level. (Refer to page 111)
Choose drive unit and motor capacities that match.
Input a start command after the motor stops.
Wire the cables properly.
Operation panel
indication
E.OC3
FR-PU07 OC During Dec
Name
Overcurrent trip during deceleration or stop
Description
When the drive unit output current reaches or exceeds approximately 230% of the rated drive unit current during
deceleration (other than acceleration or constant speed), the protective circuit is activated and the drive unit trips.
Check point
Check for sudden speed reduction.
Check for output short-circuit/ground fault.
Check for too fast operation of the motor's mechanical brake.
Check if the torque limit level is set too high.
Check that the drive unit capacity matches with the motor capacity.
Check if a start command is given to the drive unit while the motor is coasting.
Check if the three-phase (U, V, and W) wiring on the output side (load side) of the drive unit is correct. (Check for
phase loss.)
Corrective
action
Increase the deceleration time.
Check the wiring to make sure that output short circuit/ground fault does not occur.
Check the mechanical brake operation.
Lower the setting of torque limit level. (Refer to page 111)
Choose drive unit and motor capacities that match.
Input a start command after the motor stops.
Wire the cables properly.