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8. TROUBLESHOOTING
8.2 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 (25) occurred, always make home position setting
again. Not doing so may cause unexpected operation.
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.
When an alarm occurs, the trouble (ALM) switches off and the dynamic brake is operated to stop the servo
motor. 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. Use the MR
Configurator to refer to a factor of alarm occurrence.
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. The bus voltage dropped to the
following value or less.
MR-J3-
B: 200VDC
MR-J3-
B1: 158VDC
MR-J3-
B4: 380VDC
Check the power supply.
10 Undervoltage Power supply voltage
dropped.
MR-J3-
B:
160VAC or less
MR-J3-
B1:
83VAC or less
MR-J3-
B4:
280VAC or less
5. Faulty parts in the servo amplifier
Checking method
Alarm (10) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
Change the servo amplifier.