Mitsubishi Electronics MR-J2S- A A160V or Control power failure of 60ms or Less Longer, A183V or

10. TROUBLESHOOTING

10.2.2 Remedies for alarms

When any alarm has occurred, eliminate its cause, ensure safety, then reset the

CAUTION alarm, and restart operation. Otherwise, injury may occur.

If an absolute position erase alarm (AL.25) occurred, always make home position setting again. Otherwise, misoperation may occur.

POINT

When any of the following alarms has occurred, always remove its cause and allow about 30 minutes for cooling before resuming operation. If operation is resumed by switching control circuit power off, then on to reset the alarm, the servo amplifier and servo motor may become faulty.

Regenerative error (AL.30) Overload 1 (AL.50) Overload 2 (AL.51)

The alarm can be deactivated by switching power off, then on or by turning on the reset signal (RES). For details, refer to Section 10.2.1.

When an alarm occurs, the trouble signal (ALM) switches off and the dynamic brake is operated to stop the servomotor. At this time, the display indicates the alarm No.

The servo motor comes to a stop. Remove the cause of the alarm in accordance with this section. The optional servo configuration software may be used to refer to the cause.

Display	Name	Definition				Cause	Action
AL.10	Undervoltage	Power supply		1.	Power supply voltage is low.		Review the power supply.
		voltage dropped.		2.	There was an instantaneous
		MR-J2S-	A:160V or		control power failure of 60ms or
		less			longer.
		MR-J2S-	A1:83V or	3.	Shortage of power supply capacity
		less			caused the power supply voltage to
					drop at start, etc.
				4.	Power was restored after the bus
					voltage had dropped to 200VDC.
					(Main circuit power switched on
					within 5s after it had switched off.)
				5.	Faulty parts in the servo amplifier		Change the servo amplifier.
						Checking method
					Alarm (AL.10) occurs if power is
					switched on after CN1A, CN1B
					and CN3 connectors are
					disconnected.
AL.12	Memory error 1	RAM, memory fault		Faulty parts in the servo amplifier			Change the servo amplifier.
AL.13	Clock error	Printed board fault				Checking method
AL.15	Memory error 2	EEP-ROM fault			Alarm (any of AL.12,13 and 15)
					occurs if power is switched on
					after CN1A, CN1B and CN3
					all connectors are disconnected.
AL.16	Encoder error 1	Communication		1.	CN2 connector disconnected.		Connect correctly.
		error occurred		2.	Encoder fault		Change the servo motor.
		between encoder		3.	Encoder cable faulty		Repair or change cable.
		and servo amplifier.
					(Wire breakage or shorted)

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