Mitsubishi Electronics MR-J2S- A instruction manual Trouble at start-up, Make operation instable

10.TROUBLESHOOTING

10.TROUBLESHOOTING

10.1 Trouble at start-up

CAUTION	Excessive adjustment or change of parameter setting must not be made as it will
	make operation instable.

POINT

Using the optional servo configuration software, you can refer to unrotated servo motor reasons, etc.

The following faults may occur at start-up. If any of such faults occurs, take the corresponding action.

10.1.1 Position control mode

(1) Troubleshooting

No.	Start-up sequence	Fault	Investigation		Possible cause	Refer to
1	Power on	LED is not lit.	Not improved if connectors	1.	Power supply voltage fault
		LED flickers.	CN1A, CN1B, CN2 and CN3	2.	Servo amplifier is faulty.
			are disconnected.
			Improved when connectors	Power supply of CNP1 cabling
			CN1A and CN1B are	is shorted.
			disconnected.
			Improved when connector	1.	Power supply of encoder
			CN2 is disconnected.		cabling is shorted.
				2.	Encoder is faulty.
			Improved when connector	Power supply of CN3 cabling is
			CN3 is disconnected.	shorted.
		Alarm occurs.	Refer to Section 10.2 and remove cause.			Section 10.2
2	Switch on servo-on	Alarm occurs.	Refer to Section 10.2 and remove cause.			Section 10.2
	signal.	Servo motor shaft is	1. Check the display to see if	1.	Servo-on signal is not input.	Section 6.6
		not servo-locked	the servo amplifier is		(Wiring mistake)
		(is free).	ready to operate.	2.	24VDC power is not
			2. Check the external I/O		supplied to COM.
			signal indication to see if
			the servo-on (SON) signal
			is ON.
3	Enter input	Servo motor does	Check cumulative command	1.	Wiring mistake	Section 6.2
	command.	not rotate.	pulses.		(a) For open collector pulse
	(Test operation)				train input, 24VDC
					power is not supplied to
					OPC.
					(b) LSP/LSN-SG are not
					connected.
				2. No pulses is input.

Servo motor run in reverse direction.

1.Mistake in wiring to controller.

2.Mistake in setting of parameter No. 54.

Chapter 5

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