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11. TROUBLESHOOTING
11.2.3 Remedies for warnings
CAUTION
If an absolute position counter warning (AL.E3) occurred, always make home
position setting again. Otherwise, misoperation may occur.
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 (AL.E0)
Overload warning 1 (AL.E1)
If AL.E6 occurs, 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. Use the optional MR
Configurator (servo configuration software) to refer to the cause of warning.
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.
Review 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.
Review 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
AL.90 Home position
return
incomplete
In absolute position detection system
Operation was
performed without
making home position
setting while an
absolute position
erase (AL.25) is being
occurred.
6. Battery cable or battery is faulty.
Change battery. Always make
home position setting again.
1. Battery cable is open. Repair cable or changed. AL.92 Open battery
cable warning
Absolute position
detection system battery
voltage is low.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about
3.2V or less.
(Detected with the encoder)
Change battery.
1. Droop pulses remaining are greater
than the in-position range setting.
Remove the cause of droop pulse
occurrence
2. Command pulse entered after clearing
of droop pulses.
Do not enter command pulse
after clearing of droop pulses.
AL.96 Home position
setting warning
Home position setting
could not be made.
3. Creep speed high. Reduce creep speed.