Remedies For Alarms - Mitsubishi Electric Melservo MR-J3-A Instruction Manual

9. TROUBLESHOOTING

9.2 Remedies for alarms

CAUTION
When an alarm occurs, the trouble (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
MR Configurator may be used to refer to the cause.
Display Name
AL.10 Undervoltage
AL.12 Memory error 1
(RAM)
AL.13 Clock error
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 (AL.25) occurred, always make home position setting
again. Otherwise, misoperation may occur.
As soon as an alarm occurs, turn off Servo-on (SON) and power off.
POINT
When any of the following alarms has occurred, do not deactivate the alarm and
resume operation repeatedly. To do so will cause the servo amplifier/servo motor
to fail. Remove the cause of occurrence, and leave a cooling time of more than 30
minutes before resuming operation.
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 (RES). For details,
refer to section 9.1.
Definition
Power supply 1. Power supply voltage is low.
voltage dropped.
2. There was an instantaneous
MR-J3- A:
control power failure of 60ms or
160VAC or less
longer.
MR-J3- A1:
3. Shortage of power supply capacity
83VAC or less
caused the power supply voltage to
MR-J3- A4:
drop at start, etc.
280VAC or less
4. The bus voltage dropped to the
following value or less.
MR-J3- A: 200VDC
MR-J3- A1: 158VDC
MR-J3- A4: 380VDC
5. Faulty parts in the servo amplifier
Alarm (AL.10) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
RAM, memory fault Faulty parts in the servo amplifier
Alarm (any of AL.12 and AL.13)
Printed board fault
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
Cause
Checking method
Checking method
9 - 2
Action
Review the power supply.
Change the servo amplifier.
Change the servo amplifier.