Mitsubishi Electronics FR-A500L Troubleshooting, Operation Check Point Remedy Panel Display

5.2Troubleshooting

PROTECTIVE FUNCTIONS

If any function of the inverter is lost due to occurrence of a fault, clear up the cause and make correction in accordance with the following procedure. Contact your sales representative if the corresponding fault is not found below, the inverter has failed, parts have been damaged, or any other fault has occurred.

5.2.1 Checking the operation panel display at alarm stop

The alarm code is displayed on the operation panel to indicate the cause of a faulty operation. Clear up the cause and take proper action in accordance with the following table:

Operation	Check Point	Remedy
Panel Display
E.OC1	Acceleration too fast?	Increase acceleration time.
	Check for output short circuit or ground fault.
E.OC2	Sudden load change?	Keep load stable.
	Check for output short circuit or ground fault.
	Deceleration too fast?	Increase deceleration time.
E.OC3	Check for output short circuit or ground fault.
	Mechanical brake of motor operating too fast?	Check brake operation.
E.OV1	Acceleration too fast?	Increase acceleration time.
E.OV2	Sudden load change?	Keep load stable.
		Increase deceleration time. (Set deceleration time
E.OV3	Deceleration too fast?	which matches load GD2.)
		Reduce braking duty.
E.THM	Motor used under overload?	Reduce load.
E.THT		Increase motor and inverter capacities.
E.IPF	Check the cause of instantaneous power failure.	Restore power.
	Large-capacity motor started?	Check power system equipment such as power
E.UVT	Jumper or DC reactor connected across terminals P-	supply.
	P1?	Connect jumper or DC reactor across terminals P-P1.
E.FIN	Ambient temperature too high?	Set ambient temperature within specifications.
E. GF	Check motor and cables for ground fault.	Resolve ground faults.
E.OHT	Check motor for overheat.	Reduce load and frequency of operation.
E.OLT	Motor used under overload?	Reduce load.
		Increase motor and inverter capacities.
E.OPT	Check for loose connectors.	Connect securely
E.OP1 to E.OP3	Option function setting or operation proper?	Check the option function setting, etc.
	(1 to 3 indicate the option slot numbers.)
E. PE	Number of parameter write times too many?	Control card
E.PUE	DU or PU fitted securely?	Fit DU or PU securely.
E.RET	Check cause of alarm.
E.LF	Check for open output phase.	Repair open phase.
E.CPU	Check for loose connectors.	Change inverter.
		Connect securely.
E.P24	Check PC terminal output for short.	Repair short.
E.CTE	Check PU connector cable for short.	Check PU and cable.
E.MB1 to MB7	Check brake sequence.
PS	STOP key of operation panel pressed during external	Check load status.
	operation to stop?	Refer to Pr.75.
RB	Brake resistor used too often?	Increase deceleration time.
TH	Load too large? Sudden acceleration?	Reduce load amount or frequency of running.
	Motor used under overload?	Lighten load.
OL	Sudden deceleration?	Reduce frequency of braking.
	oL: Overvoltage stall
	OL: Overcurrent stall
E.14(DC fuse)	Is the DC circuit short circuited?	Repair the short-circuited section, and replace the DC
		fuse.

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