Mitsubishi Electronics QD75P, QD75D user manual LED display functions

15TROUBLESHOOTING

15.4 LED display functions

MELSEC-Q

The states of QD75 and each axis control can be confirmed by the LEDs located on the front panel of the QD75 main unit.

QD75P4

RUN AX1

AX2

AX3

ERR AX4

Each axis can be monitored by the states of the LEDs.

The operation and indications of the LEDs are as shown below.

	Details of indication
	Goes OFF		Points to be	Error	Remedy
	Goes ON		confirmed
	Flashes
	RUN	AX1		The hardware is	If the RUN LED does not light up even when the
		AX2	Extinguishment of
				faulty or watch dog	power is turned ON, the module may be out of order.
		AX3	RUN LED
				timer error occurs.	Replace the module with a new one.
	ERR	AX4
	RUN	AX1	Lighting of RUN LED,
		AX2		The module is
		AX3	Extinguishment of	normal.	—
	ERR	AX4	ERR LED
	RUN	AX1			An operation condition setting error or installation PLC
					CPU type error occurs.
		AX2
			Lighting of ERR LED	System error	(The setting and PLC CPU type are outside the
		AX3
	ERR	AX4			specification range.) Set the PLC CPU type to a one
					contained in the specification.
RUN		AX1
		AX2	Extinguishment of	During axis stop,	—
		AX3	AX1 to AX4 LEDs	during axis standby
ERR		AX4
	RUN	AX1	Lighting of AX1		This lights up from the positioning start until the
		AX2		During axis	positioning is completed, stopped temporarily, or
		AX3	(Same even if the	operation	stopped by error (corresponding at a ratio of 1 : 1 to
	ERR	AX4	other axis is lit)		BUSY signals).
	RUN	AX1	Flashing of ERR LED		Check the error observed on the buffer memory batch
		AX2	Flashing of AX1 LED
				Axis error	processing monitor of a peripheral device and correct
		AX3	(Same even if the		the applicable parameters and positioning data.
	ERR	AX4	other axis flashes)
	RUN	AX1
		AX2	Lighting of all LEDs	The hardware is	The module comes out of order. Replace the module
		AX3		faulty	with a new one.
	ERR	AX4

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