Mitsubishi Electronics FR-S500 Error alarm definitions, Major failures, OC During Acc

Errors (Alarms)

3.1.1Error (alarm) definitions

(1) Major failures

When the protective function is activated, the inverter output is shut off and the alarm is output.

Operation Panel Indication	OC1	FR-PU04	OC During Acc
Name	Overcurrent shut-off during acceleration
	When the inverter output current reaches or exceeds
Description	approximately 200% of the rated inverter current during
	acceleration, the protective circuit is activated to stop the inverter
	output.
	Check for sudden acceleration.
Check point	Check that the downward acceleration time is not long in vertical
	lift application.
	Check for output short-circuit/ground fault.
Corrective action	Increase the acceleration time.
	Shorten the downward acceleration time in vertical lift application.

Operation Panel Indication	OC2	FR-PU04	Stedy Spd OC
Name	Overcurrent shut-off during constant speed
	When the inverter output current reaches or exceeds
Description	approximately 200% of the rated inverter current during constant-
	speed operation, the protective circuit is activated to stop the
	inverter output.
Check point	Check for sudden load change.
	Check for output short-circuit/ground fault.
Corrective action	Keep load stable.

Operation Panel Indication	OC3	FR-PU04	OC During Dec
Name	Overcurrent shut-off during deceleration
	When the inverter output current reaches or exceeds
Description	approximately 200% of the rated inverter current during
	deceleration (other than acceleration or constant speed), the
	protective circuit is activated to stop the inverter output.
Check point	Check for sudden speed reduction.
	Check for output short-circuit/ground fault.
	Check for too fast operation of motor's mechanical brake.
Corrective action	Increase the deceleration time.
	Adjust brake operation.

PROTECTIVE FUNCTIONS

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