Mitsubishi Electronics QD75D Related buffer memory Set range, Remedy, Output signals to QD75

15 TROUBLESHOOTING

MELSEC-Q

Related buffer memory				Set range
	address				Remedy
				(Setting with sequence program)
Axis 1	Axis 2	Axis 3	Axis 4
—	—	—	—	—	—
—	—	—	—	—	• Check that there is no influence from noise.
					• Check hardware for possibility of fault.
					• Review the sequence program which turns ON/OFF
—	—	—	—	—	PLC READY signal (Y0).
					• Cancel the error with an axis error reset.
					(Refer to Section 15.1[3])
					Check the drive unit power, wiring with the drive unit,
—	—	—	—	—	and connection of connectors, and cancel the error
					with an axis error reset. (Refer to Section 15.1[3])
—	—	—	—	—	Check that there is no error on the personal computer
					side I/F to which a cable is connected.
					After making an axis error reset (refer to [3] in Section
—	—	—	—	—	15.1), perform manual control operation (refer to
					Chapter 11) to move the axis to the other position in
					order that the upper limit signal (FLS) will not turn OFF.
					After making an axis error reset (refer to [3] in Section
—	—	—	—	—	15.1), perform manual control operation (refer to
					Chapter 11) to move the axis to the other position in
					order that the lower limit signal (RLS) will not turn OFF.
					Check whether the stop commands (output
					signals/external inputs to QD75) are turned ON or
					OFF. Turn OFF the ON commands.
					• Output signals to QD75
					Axis 1: Y4, Axis 2: Y5, Axis 3: Y6, Axis 4: Y7
—	—	—	—	—	• External input
					Connectors for external device connection:
					Stop signals (STOP)
					After confirming the stop command status, cancel the
					error with an axis error reset. Then turn ON a start
					signal. (Refer to Section 15.1[3])
—	—	—	—	—	Turn ON the PLC READY signal (Y0) with the BUSY
					signals of all axes OFF.
					• Validate the OPR retry function
				<OPR retry>	(set value: 1). (Refer to Section 12.1.1)
78	228	378	528		• Move the workpiece from the current position (on OP)
				0, 1
					using the manual control operation (refer to Chapter
					11), then carry out a machine OPR again.

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