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10. TROUBLESHOOTING
Display Name Definition Cause Action
88888 Watchdog CPU, parts faulty Fault of parts in servo amplifier
Checking method
Alarm (88888) occurs if power
is switched on after CN1A, CN1B
and CN3 connectors are
disconnected.
Change servo amplifier.
10.2.3 Remedies for warnings
If AL.E6 or AL.EA 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
servo configuration software to refer to the cause of warning.
Display Name Definition Cause Action
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 dropped to 2.8V or less. 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.
AL.9F Battery warning Voltage of battery for
absolute position
detection system reduced.
Battery voltage fell to 3.2V or less. Change the battery.
AL.E0 Excessive
regenerative
warning
There is a possibility that
regenerative power may
exceed permissible
regenerative power of
built-in regenerative
brake resistor or
regenerative brake
option.
Regenerative power increased to 85% or
more of permissible regenerative power of
built-in regenerative brake resistor or
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.
AL.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 AL.50,51.
Refer to AL.50, AL.51.
1. Noise entered the encoder. Take noise suppression
measures.
AL.E3 Absolute position
counter warning
Absolute position encoder
pulses faulty.
2. Encoder faulty. Change servo motor.
1. PC lader program wrong. Contact the program.AL.E5 ABS time-out
warning
2. ST2
TLC signal mis-wiring Connect properly.
AL.E6 Servo emergency
stop warning
EMG-SG are open. External emergency stop was made valid.
(EMG-SG opened.)
Ensure safety and deactivate
emergency stop.
AL.E9 Main circuit off
warning
Servo was switched on
with main circuit power
off.
Switch on main circuit power.
1. PC ladder program wrong. 1. Correct the program.AL.EA ABS
servo-on warning
Servo-on signal (SON)
turned on more than 1s
after servo amplifier had
entered absolute position
data transfer mode.
2. SON signal mis-wiring. 2. Connect properly.