Mitsubishi Electronics FR-V500 OV During Acc, OV During Dec, Motor Overload, Inv. Overload

Errors (Alarms)

Operation Panel	E.OV1		FR-PU04V	OV During Acc
Indication
Name	Regenerative	overvoltage shut-off during acceleration (*2)
	If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
Description	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.
	• Use the brake unit or power regeneration common converter (FR-CV) as required.
Operation Panel	E.OV2		FR-PU04V	Stedy Spd OV
Indication
Name	Regenerative	overvoltage shut-off during constant speed (*2)
	If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the
Description	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.

•Keep load stable.

Corrective action

•Use the brake unit or power regeneration common converter (FR-CV) as required.

*2: E. OV3 appears if the over voltage shutoff occurs during positioning.

Operation Panel	E.OV3		FR-PU04V		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 reach or exceed the
Description	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.
Corrective action	(Set the deceleration time that meets the inertia moment of the load)
	• Decrease the braking duty.
	• Use the brake unit or power regeneration common converter (FR-CV) as required.
Operation Panel	E.THM		FR-PU04V		Motor Overload
Indication
Name	Motor overload	shut-off (electronic thermal relay) (*3)
	The electronic thermal relay built in the inverter detects motor overheat due to overload or reduced
	cooling capability during constant-speed operation to stop the inverter output. When running a
Description	multi-pole motor or two or more motors during V/F control, provide a thermal relay in the inverter
	output side since such motor(s) cannot be protected.
	Protection against burnout due to motor temperature rise
Check point	Check the motor for use under overload.
Corrective action	• Reduce the load weight.
	• For a constant-torque motor, set the constant-torque motor in Pr. 71 "applied motor".
Operation Panel	E.THT		FR-PU04V		Inv. Overload
Indication
Name	Inverter overload shut-off (electronic thermal relay) (*3)
	If a current not less than 150% of the rated output current flows and overcurrent shut-off does not
Description	occur (200% or less), inverse-time characteristics cause the electronic thermal relay to be
	activated to stop the inverter output in order to protect the output transistors.
	Protection of output transistors against overheat.
Check point	Check the motor for use under overload.
Corrective action	Reduce the load weight.

*3. Resetting the inverter initializes the internal heat integrating data of the electronic thermal relay.

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