Mitsubishi FR - S500 instruction manual 138, OC2 FR-PU04, OC3 FR-PU04, OV1 FR-PU04, OV2 FR-PU04

Operation Panel Indication	OC2	FR-PU04	Stedy Spd OC
Name	Overcurrent cut-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 cut-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 for sudden speed reduction.
Check point	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.

Operation Panel Indication	OV1	FR-PU04	OV During Acc
Name	Regenerative overvoltage cut-off during acceleration
	When the main circuit DC voltage in the inverter rises to or above
	the specified value due to excessive regenerative energy during
Description	acceleration, the protective circuit is activated to stop the inverter
	output. The circuit may also be activated by a surge voltage
	produced in the power supply system.
Check point	Check for too slow acceleration.
Corrective action	Decrease the acceleration time.
	Install a power factor improving reactor.

Operation Panel Indication	OV2	FR-PU04	Stedy Spd OV
Name	Regenerative overvoltage cut-off during constant speed
	When the main circuit DC voltage in the inverter rises to or above
	the specified value due to excessive regenerative energy during
Description	constant speed, the protective circuit is activated to stop the
	inverter output. The circuit may also be activated by a surge
	voltage produced in the power supply system.
Check point	Check for sudden load change.
Corrective action	Keep load stable.
	Install a power factor improving reactor.

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