Mitsumi electronic 55K OC During Dec, OV During Acc, Check for too slow acceleration

				PROTECTIVE FUNCTIONS
Operation Panel	E.OC3		FR-PU04	OC During Dec
Indication
Name	Overcurrent shut-off during deceleration
	When the inverter output current reaches or exceeds approximately 150% of the
Description	rated current during deceleration (other than acceleration or constant speed),
	the protective circuit is activated to stop the inverter output.
	Check for sudden speed reduction.
Check point	Check for output short circuit.
	Check for too fast operation of motor's mechanical brake.
Corrective action	Increase the deceleration time.
	Check mechanical brake operation.
Operation Panel	E.OV1		FR-PU04	OV During Acc
Indication
Name	Regenerative overvoltage shut-off during acceleration
	If regenerative energy causes the inverter's internal main circuit DC voltage to
Description	reach or exceed the specified value, the protective circuit is activated to stop the
	inverter output. It may also be activated by a surge voltage generated in the
	power supply system.
Check point	Check for too slow acceleration.
Corrective action	Decrease the acceleration time.
Operation Panel	E.OV2		FR-PU04	Stedy Spd OV
Indication
Name	Regenerative overvoltage shut-off during constant speed
	If regenerative energy causes the inverter's internal main circuit DC voltage to
Description	reach or exceed the specified value, the protective circuit is activated to stop the
	inverter output. It may also be activated by a surge voltage generated in the
	power supply system.
Check point	Check for sudden load change.
Corrective action	•	Keep load stable.
	•	Use the brake unit or power regeneration converter (FR-RC) as required.
Operation Panel	E.OV3		FR-PU04	OV During Dec
Indication
Name	Regenerative overvoltage shut-off during deceleration or stop
	If regenerative energy causes the inverter's internal main circuit DC voltage to
Description	reach or exceed the specified value, the protective circuit is activated to stop the
	inverter output. It may also be activated by a surge voltage generated in the
	power supply system.
Check point	Check for sudden speed reduction.
	•	Increase the deceleration time. (Set the deceleration time which matches the
Corrective action		inertia moment of the load.)
	•	Decrease the braking duty.
	•	Use the brake unit or power regeneration converter (FR-RC) as required.

5

164