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10. TROUBLESHOOTING
10.2.2 Remedies for alarms
CAUTION
When any alarm has occurred, eliminate its cause, ensure safety, then reset the
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
1. Power supply voltage is low.
2. There was an instantaneous
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.
(Main circuit power switched on
within 5s after it had switched off.)
Review the power supply.
AL.10 Undervoltage Power supply
voltage dropped.
MR-J2S-
A:160V or
less
MR-J2S-
A1:83V or
less
5. Faulty parts in the servo amplifier
Checking method
Alarm (AL.10) occurs if power is
switched on after CN1A, CN1B
and CN3 connectors are
disconnected.
Change the servo amplifier.
AL.12 Memory error 1 RAM, memory fault
AL.13 Clock error Printed board fault
AL.15 Memory error 2 EEP-ROM fault
Faulty parts in the servo amplifier
Checking method
Alarm (any of AL.12,13 and 15)
occurs if power is switched on
after CN1A, CN1B and CN3
all connectors are disconnected.
Change the servo amplifier.
1. CN2 connector disconnected. Connect correctly.
2. Encoder fault Change the servo motor.
AL.16 Encoder error 1 Communication
error occurred
between encoder
and servo amplifier.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change cable.