Mitsubishi Electronics MR-J2S- A instruction manual Torque control mode

10. TROUBLESHOOTING

10.1.3 Torque control mode

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 CN1 cabling is
			CN1A and CN1B are	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	Call the external I/O signal	1. Servo-on signal is not input.	Section 6.6
		free.	display and check the	(Wiring mistake)
			ON/OFF status of the input	2. 24VDC power is not
			signal.	supplied to COM.
3	Switch on forward	Servo motor does	Call the status display and	Analog torque command is 0V.	Section 6.2
	rotation start (RS1)	not rotate.	check the analog torque
	or reverse rotation		command (TC).
	start (RS2).		Call the external I/O signal	RS1 or RS2 is off.	Section 6.6
			display and check the
			ON/OFF status of the input
			signal.
			Check the internal speed	Set value is 0.	(1),
			limits 1 to 7		Section 5.1.2
			(parameters No. 8 to 10 72
			to 75).
			Check the analog torque	Torque command level is too
			command maximum output	low as compared to the load
			(parameter No. 26) value.	torque.
			Check the internal torque	Set value is 0.
			limit 1 (parameter No. 28).

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