Mitsubishi Electronics FR-V500 Inst. Pwr. Loss, Under Voltage, Sink O/Temp, Br. Cct. Fault

Errors (Alarms)

Operation Panel	E.IPF		FR-PU04V	Inst. Pwr. Loss
Indication
Name	Instantaneous	power failure protection	(*4)
	If a power failure occurs for longer than 15ms (this also applies to inverter input shut-off), the
	instantaneous power failure protective function is activated to stop the inverter output in order to
	prevent the control circuit from malfunctioning. At this time, the alarm warning output contacts open
Description	(across terminals B-C) and close (across terminals A-C). If a power failure persists for longer than
	100ms, the alarm warning output is not provided, and the inverter restarts if the start signal is on
	upon power restoration. (The inverter continues operating if an instantaneous power failure is
	within 15ms.)
Check point	Find the cause of instantaneous power failure occurrence.
	• Remedy the instantaneous power failure.
Corrective action	• Prepare a backup power supply for instantaneous power failure.
	• Set the function of automatic restart after instantaneous power failure (Pr. 57).
	(Refer to page 56.)

*4: When an instantaneous power failure occurs, the alarm display and alarm output are not provided, but the inverter performs protective operation to prevent a fault from occurring in itself. In some operating status (load magnitude, acceleration/deceleration time setting, etc.), overcurrent or other protection may be activated upon power restoration.

Operation Panel	E.UVT		FR-PU04V	Under Voltage
Indication
Name	Undervoltage	protection
	If the power supply voltage of the inverter reduces, the control circuit will not perform normal
	functions. In addition, the motor torque wiil be insufficient and/or heat generation will increase. To
Description	prevent this, if the power supply voltage reduces below about 150V (300V for the 400V class), this
	function stops the inverter output.
	When a jumper is not connected across P-P1, the undervoltage protective function is activated.
Check point	• Check for start of large-capacity motor.
	• Check that a jumper or DC reactor is connected across terminals P-P1.
Corrective action	Check the power supply system equipment such as power supply.
	Connect a jumper or DC reactor across terminals P-P1.
Operation Panel	E.FIN		FR-PU04V	H/Sink O/Temp
Indication
Name	Fin overheat
Description	If the heatsink overheats, the temperature sensor is actuated to stop the inverter output.

•Check for too high ambient temperature.

Check point • Check for heatsink clogging.

•Check that the cooling fan is stopped.

•Set the ambient temperature to within the specifications.

Corrective action

•Replace the cooling fan.

Operation Panel	E.BE		FR-PU04V	Br. Cct. Fault
Indication
Name	Brake transistor	alarm detection
	This function stops the inverter output if an alarm occurs in the brake circuit, e.g. damaged brake
Description	transistors.
	In this case, the inverter must be powered off immediately.
	• Reduce the load inertia.
Check point	• Check that the frequency of using the brake is proper.
	• Check that the brake resistor selected is correct.
Corrective action	Replace the inverter.
Operation Panel	E.GF		FR-PU04V	Ground Fault
Indication
Name	Output side earth (ground) fault overcurrent protection
Description	This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
	(ground) fault that occurred in the inverter's output (load) side.
Check point	Check for an earth (ground) fault in the motor and connection cable.
Corrective action	Remedy the earth (ground) fault portion.

ERRORS AND PROTECTIVE FUNCTIONS

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