Remedies For Alarms - Mitsubishi Electric MR-J2S-*A series 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
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 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.
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
Alarm (AL.10) occurs if power is
switched on after CN1A, CN1B
and CN3 connectors are
disconnected.
Faulty parts in the servo amplifier
Printed board fault
Alarm (any of AL.12,13 and 15)
occurs if power is switched on
after CN1A, CN1B and CN3
all connectors are disconnected.
1. CN2 connector disconnected.
error occurred
2. Encoder fault
between encoder
3. Encoder cable faulty
and servo amplifier.
(Wire breakage or shorted)
Cause
Checking method
Checking method
10 - 7
Action
Review the power supply.
Change the servo amplifier.
Change the servo amplifier.
Connect correctly.
Change the servo motor.
Repair or change cable.