Remedies For Alarms - Mitsubishi Electric GENERAL PURPOSE AC SERVO MR-E- A/AG Instruction Manual

10. TROUBLESHOOTING

10.2.2 Remedies for alarms

CAUTION
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
AL.10 Undervoltage
AL.12 Memory error 1 RAM, memory fault
AL.13 Clock error
AL.15 Memory error 2 EEP-ROM fault
AL.16 Encoder error 1 Communication
AL.17 Board error
AL.19 Memory error 3 ROM memory fault
When any alarm has occurred, eliminate its cause, ensure safety, then reset the
alarm, and restart operation. Otherwise, injury 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 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 press the
"SET" button on the current alarm screen or by turning on the reset signal
(RES). For details, refer to Section 10.2.1.
Definition
Power supply 1. Power supply voltage is low.
voltage dropped to
2. There was an instantaneous
160VAC or less.
control power failure of 60ms or
longer.
3. Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc.
4. Power was restored after the bus
voltage had dropped to 200VDC.
5. Faulty parts in the servo amplifier Change the servo amplifier.
Faulty parts in the servo amplifier
Printed board fault
1. Faulty parts in the servo amplifier
2. The number of write times to EEP-
ROM exceeded 100,000.
1. Encoder connector (CN2)
error occurred disconnected.
between encoder
2. Encoder fault
and servo amplifier. 3. Encoder cable faulty
(Wire breakage or shorted)
CPU/parts fault
Faulty parts in the servo amplifier
Cause
Review the power supply.
Change the servo amplifier.
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change cable.
Change the servo amplifier.
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