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11. TROUBLESHOOTING
11.2.2 Remedies for alarms
CAUTION
When an alarm occurs, the trouble (ALM) switches off and the servo motor is stopped by the dynamic
brake. At this time, the display shows the corresponding alarm number.
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
A.10
Undervoltage
A.11
Board error 1
A.12
Memory error 1
A.13
Clock error
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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 (A.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 the main
circuit.
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, servo motor and regenerative brake option
may become faulty.
Regenerative alarm (A.30)
Overload 1 (A.50)
Overload 2 (A.51)
Deactivate the alarm by switching power off, then on.
When reset (RES) is made valid in "I/O Devices" on the Servo Con-
figuration Software, reset (RES) may be used to deactivate the alarm.
Refer to Section 11.2.1 for details.
Name
Definition
Power supply voltage
dropped.MR-J2- C
:160V or less
Printed board faulty
RAM, ROM memory
fault
Printed board fault
search engine
Cause
1. Power supply voltage is low.
2. Power failed instantaneously for 60ms
or longer.
3. Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc.
4. Power was restored after bus voltage
had dropped to 200VDC.
(Main circuit power was switched on
within 5s after it had been switched off.)
5. Faulty parts in the servo amplifier
Checking method
Alarm (A.10) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
Faulty parts in the servo amplifier
Checking method
Alarm (any of A.11 to 13) occurs
if power is switched on after
disconnection of all cables but
the control circuit power supply
cables.
11 - 3
Action
Review the power supply.
Change the servo amplifier.
Change the servo amplifier.
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