Mitsubishi Electronics FR-V500 instruction manual Errors Alarms, Major faults

Errors (Alarms)

6 ERRORS AND PROTECTIVE FUNCTIONS

6.1 Errors (Alarms)

If any fault has occurred in the inverter, the corresponding protective function is activated to bring the inverter to an alarm stop and automatically give the corresponding error (alarm) indication on the PU display.

If the fault does not correspond to any of the following errors or if you have any other problem, please contact your sales representative or distributor.

!When the alarm output signal holding protective function is activated, opening the magnetic contactor (MC) provided on the inverter's power supply side will cause the control power of the inverter to be lost and the alarm output not to be held.

!When the alarm display protective function is activated, the operation panel display section is changed automatically.

!When the resetting method protective function is activated, the inverter output stop status is held, and the inverter cannot restart unless it is reset. To reset, switch power off once, then on again, or turn on the RES signal for more than 0.1 seconds.

If the RES signal is kept on, "Err." appears (flickers) to indicate that the inverter is in a reset status.

!When any protective function is activated, take the corresponding corrective action, then reset the inverter, and resume operation.

6.1.1Major faults

When the protective function is activated, the inverter output is shut off and an alarm is output.

Operation Panel	E.OC1	FR-PU04V	OC During Acc
Indication
Name	Overcurrent shut-off during acceleration (*1)
	When the inverter output current reaches or exceeds approximately 200% of the rated inverter
Description	current during acceleration, the protective circuit is activated to stop the inverter output.
	Power is supplied to only the R1 and S1 terminals. This indication also appears when the start
	signal is entered.
	• Check for sudden acceleration.
Check point	• Check for output short circuit.
	• Check that main circuit power (R, S, T) is supplied.
Corrective action	• Increase the acceleration time.
	• Supply main circuit power (R, S, T).
Operation Panel	E.OC2	FR-PU04V	Stedy Spd OV
Indication
Name	Overcurrent shut-off during constant speed (*1)
	When the inverter output current reaches or exceeds approximately 200% of the rated inverter
Description	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.
Corrective action	Keep load stable.

*1: E. OC3 appears if the overcurrent shutoff occurs during positioning.

Operation Panel	E.OC3	FR-PU04V	OC During Dec
Indication
Name	Overcurrent shut-off during deceleration
	When the inverter output current reaches or exceeds approximately 200% of the rated inverter
Description	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.
	• Check for too fast operation of the motor's mechanical brake.
Corrective action	• Increase the deceleration time.
	• Check the mechanical brake operation.

ERRORS AND PROTECTIVE FUNCTIONS

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