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11. TROUBLESHOOTING
Display Name Definition Cause Action
In incremental
system:
1. Positioning
operation was
performed without
home position
return.
2. Home position
return ended
abnormally.
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. Perform home position return.
2. Review home position return speed/creep
speed/moving distance after proximity
dog.
AL.63 Home position
return
incomplete
In absolute position
detection system:
1. Positioning
operation was
performed without
home position
setting.
2. Home position
setting ended
abnormally.
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.
1. Perform home position setting.
2. Review home position setting speed/creep
speed/moving distance after proximity
dog.
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.64 Home position
setting error
Home position
setting could not be
made.
3. Creep speed high. Reduce creep speed.
1. Communication cable breakage. Repair or change communication cable
2. Communication cycle longer than
parameter No. 23 setting.
Set correct value in parameter.
AL.8A Serial
communication
time-out error
RS-232C or RS-422
communication
stopped for longer
than the time set in
parameter No.23.
3. Wrong protocol. Correct protocol.
1. Communication cable fault
(Open cable or short circuit)
Repair or change the cable.AL.8E Serial
communication
error
Serial
communication error
occurred between
servo amplifier and
communication
device (e.g. personal
computer).
2. Communication device (e.g.
personal computer) faulty
Change the communication device (e.g.
personal computer).
88888 Watchdog CPU, parts faulty Fault of parts in servo amplifier
Checking method
Alarm (88888) occurs if power is
switched on after disconnection
of all cables but the control
circuit power supply cables.
Change servo amplifier.