Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

Page: 374 / 802

11 - 17
11. TROUBLESHOOTING
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 warnings 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 warnings, allow more than 30 minutes for cooling
before resuming operation.
Excessive regenerative warning (AE0)
Overload warning 1 (AE1)
Warnings are not recorded in the alarm history.
When AE6 and AE9 occur, the servo turns off. When any other warning occurs, the operation continues.
However, an alarm may occur, causing improper operation.
Remove the cause of warning according to this section. Use MR Configurator to refer to the cause of warning
occurrence.
Display Name Definition Cause Action
A90 Home position
return incomplete
In
in
crem
ent
al
sys
te
m
Positioning operation
was performed
without home
position return.
1. Positioning operation was performed
without home position return.
Perform home position return.
Home position return
ended abnormally.
2. Home position return speed could not be
decreased to the 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.
In abs
ol
ut
e po
si
tion det
ec
tion
sy
st
em
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 return speed could not be
decreased to the creep speed.
3. Limit switch was actuated during home
position setting starting at other than
position beyond dog.
Check home position return
speed/creep speed/moving
distance after proximity dog.
Operation was
performed without
making home
position setting while
an absolute position
erase (A25) is being
occurred. 4. Voltage drop in encoder
(Battery disconnected.)
Connect the battery and make
home position setting again.
5. Battery voltage low Change the battery.
Always make home position
setting again.
6. Battery cable or battery is faulty.
A92 Open battery cable
warning
Absolute position
detection system battery
voltage is low. 1. Battery cable is open. Repair cable or changed.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about 3V or
less.
(Detected with the encoder)
Change the battery.
3. An encoder cable was disconnected. Repair or replace the encoder
cable.