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9. TROUBLESHOOTING
9.4 Remedies for warnings
CAUTION
If an absolute position counter warning (A.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 (A.E0)
Overload warning 1 (A.E1)
If servo forced stop warning (A.E6) or main circuit off warning (A.E9) 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. Eliminate the cause of the warning according to this section. Use
the optional MR Configurator (servo configuration software) to refer to the cause of warning.
@ in the Indication field denotes the slot number of the base unit.
Display
IFU DRU
Name Definition Cause Action
1. Battery cable is open. Repair cable or changed.
2. Battery voltage supplied from the
battery unit to the encoder fell to
about 3.2V or less.
(Detected with the encoder)
Change battery unit.
@A.92@
Open battery
cable warning
Absolute position
detection system
battery voltage is low.
3. Encoder cable is open. Change the encoder cable.
1. Droop pulses remaining are greater
than the in-position range setting.
Remove the cause of droop pulse
occurrence.
2. Home position return was executed
during operation command.
@A.96@ Home position
setting warning
Home position return
could not be made in
the precise position.
3. Creep speed high.
Reduce creep speed.
FA.9F
Battery
warning
Voltage of battery for
absolute position
detection system
reduced.
Battery voltage fell to 3.2V or less.
(Detected with the servo amplifier)
Change the battery unit.
FA.E0
Excessive
regenerative
warning
There is a possibility
that regenerative
power may exceed
permissible
regenerative power of
regenerative brake
option.
Regenerative power increased to 85%
or more of permissible regenerative
power of regenerative brake option.
Checking method
Call the status display and check
regenerative load ratio.
1. Reduce frequency of
positioning.
2. Change regenerative brake
option for the one with larger
capacity.
3. Reduce load.
@A.E1@ Overload
warning
There is a possibility
that overload alarm 1
or 2 may occur.
Load increased to 85% or more of
overload alarm 1 or 2 occurrence level.
Cause, checking method
Refer to A.50, A.51.
Refer to A.50, A.51.
1. Noise entered the encoder. Take noise suppression
measures.
Absolute position
encoder pulses faulty.
2. Encoder faulty. Change servo motor.
@A.E3@ Absolute
position counter
warning
The multi-revolution
counter value of the
absolute position
encoder exceeded the
maximum revolution
range.
3. The movement amount from the
home position exceeded a 32767
rotation or -37268 rotation in
succession.
Make home position setting
again.
FA.E6
Servo forced
stop warning
EMG_
-
SG
are open. External forced stop was made valid.
(EMG_
-SG opened.)
Ensure safety and deactivate
forced stop.
FA.E9
Main circuit off
warning
Servo-on (SON
) was
turned on with main
circuit power off.
Switch on main circuit power.