Mitsubishi FR - S500 instruction manual 139, OV3, Thm, Tht

Operation Panel Indication	OV3	FR-PU04	OV During Dec
Name	Regenerative overvoltage cut-off during deceleration or stop
	When the main circuit DC voltage in the inverter rises to or above
	the specified value due to excessive regenerative energy during
Description	deceleration or stop, 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 speed reduction.
	Increase the deceleration time. (Set the deceleration time which
Corrective action	matches the inertia moment of the load)
	Decrease the braking duty.
	Install a power factor improving reactor.

Operation Panel Indication	THM	FR-PU04	Motor Overload
Name	Motor overload cut-off (electronic thermal overcurrent protection)
	(* 1)
	The electronic overcurrent protection in the inverter detects motor
	overheat due to overload or reduced cooling capability during low-
Description	speed operation to stop the inverter output. When a multi-pole
	motor or two or more motors are run, provide a thermal relay in
	the output side of the inverter.
	Protection from burning due to motor temperature rise
Check point	Check the motor for use under overload.
	Reduce the load weight.
Corrective action	For the constant-torque motor, change the Pr. 71 setting to the
	constant-torque motor setting.

Operation Panel Indication	THT	FR-PU04	Inv. Overload
Name	Inverter overload cut-off (electronic thermal overcurrent protection)
	(* 1)
	If a current of more than 150% of the rated output current flows
	and overcurrent shut-off does not occur (200% or less), inverse-
Description	time characteristics cause the electronic overcurrent protection to
	be activated to stop the inverter output in order to protect the
	output transistors.
	Output transistor protection from overheat
Check point	Check the motor for use under overload.
Corrective action	Reduce the load weight.

*1. Resetting the inverter initializes the internal heat integrating data of the electronic overcurrent protection.

Operation Panel Indication	FIN	FR-PU04	H/Sink O/Temp
Name	Fin overheat
Description	If the cooling fin overheats, the overheat sensor is actuated to
	stop the inverter output.
Check point	Check for too high ambient temperature.
	Check for cooling fin clogging.
Corrective action	Set the ambient temperature to within the specifications.

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