Remedies For Alarms - Mitsubishi Electric MR-J3-B Instruction Manual

8. TROUBLESHOOTING

8.2 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. MR
Configulator (servo configuration software) may be used to refer to the cause.
Display Name
10 Undervoltage
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 (25) occurred, always make home position setting
again. Otherwise, misoperation may occur.
As soon as an alarm occurs, mark Servo-off and power off the main circuit and
control circuit.
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. To protect the main circuit
elements, any of these servo alarms cannot be deactivated from the servo
system controller until the specified time elapses after its occurrence. Judging
the load changing condition until the alarm occurs, the servo amplifier
calculates this specified time automatically.
Regenerative error (30)
Overload 1 (50)
Overload 2 (51)
The alarm can be deactivated by switching power off, then on or by the error
reset command CPU reset from the servo system controller. For details, refer
to Section 8.1.
Definition
Power supply voltage 1. Power supply voltage is low.
dropped.
2. There was an instantaneous control
MR-J3- B:
power failure of 60ms or longer.
160VAC or less
3. Shortage of power supply capacity
MR-J3- B1:
caused the power supply voltage to
83VAC or less
drop at start, etc.
4. The bus voltage dropped to the
following value or less.
MR-J3- B: 200VDC
MR-J3- B1: 158VDC
5. Faulty parts in the servo amplifier
Alarm (10) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
Cause
Checking method
8 - 2
Action
Review the power supply.
Change the servo amplifier.