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11. TROUBLESHOOTING
Display Name Definition Cause Action
(Note)
888
Watchdog CPU, parts faulty. Fault of parts in servo amplifier.
Checking method
Alarm (888) occurs if power is
switched on after disconnection of
all cables but the control circuit
power supply cable.
Change the servo amplifier.
Note. At power-on, "888" appears instantaneously, but it is not an error.
11.4.3 Remedies for warnings
CAUTION
If an absolute position counter warning (AE3) occurred, always make home
position setting again. Not doing so may cause unexpected operation.
POINT
When any of the following alarms has occurred, do not resume operation by
switching power of the servo amplifier OFF/ON repeatedly. The servo amplifier
and servo motor may become faulty. If the power of the servo amplifier is
switched OFF/ON during the alarms, allow more than 30 minutes for cooling
before resuming operation.
Excessive regenerative warning (AE0)
Overload warning 1 (AE1)
If AE6 occur, the servo off status is established. If any other warning occurs, operation can be continued but an
alarm may take place or proper operation may not be performed.
Remove the cause of warning according to this section. Use the MR Configurator to refer to a factor of warning
occurrence.
Display Name Definition Cause Action
Positioning operation
was performed
without home
position return.
1. Positioning operation was performed
without home position return.
Perform home position return.
In incremental system
Home position return
ended abnormally.
2. Home position return speed could not be
decreased to creep speed.
3. Limit switch was actuated during home
position return starting at other than
position beyond dog.
Check home position return
speed/creep speed/moving
distance after proximity dog.
Positioning operation
was performed
without home
position setting.
1. Positioning operation was performed
without home position setting.
Perform home position setting.
Home position
setting ended
abnormally.
2. Home position setting speed could not be
decreased to creep speed.
3. Limit switch was actuated during home
position setting starting at other than
position beyond dog.
Check home position setting
speed/creep speed/moving
distance after proximity dog.
4. Voltage drop in encoder
(Battery disconnected.)
After leaving the alarm occurring
for a few minutes, switch power
off, then on again. Always make
home position setting again.
5. Battery voltage low
A90 Home position
return incomplete
In absolute position detection system
Operation was
performed without
making home
position setting while
an absolute position
erase (A25) is being
occurred.
6. Battery cable or battery is faulty.
Change the battery.
Always make home position
setting again.