Remedies For Warnings - Mitsubishi Electric MELSERVO-J3 Series Manual

11. TROUBLESHOOTING
Display Name
(Note) Watchdog
888
Note. At power-on, "888" appears instantaneously, but it is not an error.

11.4.3 Remedies for warnings

CAUTION
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
A90 Home position
return incomplete
Definition
CPU, parts faulty. Fault of parts in servo amplifier.
Alarm (888) occurs if power is
switched on after disconnection of
all cables but the control circuit
power supply cable.
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)
Definition
Positioning operation
was performed
without home
position return.
Home position return
ended abnormally.
Positioning operation
was performed
without home
position setting.
Home position
setting ended
abnormally.
Operation was
performed without
making home
position setting while
an absolute position
erase (A25) is being
occurred.
Cause
Checking method
Cause
1. Positioning operation was performed
without home position return.
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.
1. Positioning operation was performed
without home position setting.
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.
4. Voltage drop in encoder
(Battery disconnected.)
5. Battery voltage low
6. Battery cable or battery is faulty.
11 - 11
Action
Change the servo amplifier.
Action
Perform home position return.
Check home position return
speed/creep speed/moving
distance after proximity dog.
Perform home position setting.
Check home position setting
speed/creep speed/moving
distance after proximity dog.
After leaving the alarm occurring
for a few minutes, switch power
off, then on again. Always make
home position setting again.
Change the battery.
Always make home position
setting again.