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9. TROUBLESHOOTING
Display Name Definition Cause Action
(Note 2)
Alarm details
AL.52 Error excessive The difference
between the model
position and the
actual servo motor
position exceeds
three rotations.
(Refer to the
function block
diagram in section
1.2.)
1. Acceleration/deceleration time
constant is too small.
Increase the acceleration/
deceleration time constant.
2. Forward rotation torque limit
(parameter No.PA11) or reverse
rotation torque limit (parameter
No.PA12) are too small.
Increase the torque limit
value.
3. Motor cannot be started due to torque
shortage caused by power supply
voltage drop.
1. Check the power supply
capacity.
2. Use servo motor which
provides larger output.
4. Position loop gain 1 (parameter
No.PB08) value is small.
Increase set value and
adjust to ensure proper
operation.
5. Servo motor shaft was rotated by
external force.
1. When torque is limited,
increase the limit value.
2. Reduce load.
3. Use servo motor that
provides larger output.
6. Machine struck something. 1. Check operation pattern.
2. Install limit switches.
7. Encoder faulty Change the servo motor.
8. Incorrect connection of servo motor.
Servo amplifier's output terminals U, V,
W do not match servo motor's input
terminals U, V, W.
Connect correctly.
9. A power cable is broken. Repair the cable.
10. A command is input when the torque
limit is "0".
Set the torque limit to the
proper value.
8
AL.8A Serial
communication
time-out error
USB
communication or
RS-422
communication
stopped for longer
than the specified
time.
1. Communication cable breakage. Repair or change the
communication cable.
2. Communication cycle longer than
regulated time.
Shorten the communication
cycle.
3. Incorrect protocol. Correct protocol.
AL.8E Serial
communication
error
Serial
communication
error occurred
between servo
amplifier and
communication
device (e.g.
personal
computer).
1. Communication cable fault
(Open cable or short circuit)
Repair or change the cable. 1, 2
2. Communication device (e.g. personal
computer) faulty
Change the communication
device (e.g. personal
computer).
3. A character code is faulty. Check the character codes. 4
4. A command is faulty. Check the commands. 8
5. A data No. is faulty. Check the data No. 10