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9. TROUBLESHOOTING
Display Name Definition Cause Action
1. Acceleration/deceleration time
constant is too small.
Increase the acceleration/deceleration
time constant.
2. Torque limit value is too small. Increase the torque limit value.
3. Motor cannot be started due to
torque shortage caused by power
supply voltage drop.
1. Review the power supply capacity.
2. Use servo motor which provides larger
output.
4. Position control gain 1 (parameter
No.13) 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. Review operation pattern.
2. Install limit switches.
7. Encoder faulty Change the servo motor.
52 (Note)
Error excessive
The deviation
between the model
position and the
actual servo motor
position exceeds the
parameter No.31
setting value (initial
value: 2
revolutions).
8. Wrong 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.
1. Communication cable fault
(Open cable or short circuit)
Repair or change the cable.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).
88 Watchdog CPU, parts faulty Fault of parts in servo amplifier
Checking method
Alarm (88) occurs if power is
switched on after disconnection
of all cable but the control circuit
power supply cable.
Change servo amplifier.
Note: The error excessive detection for 2 revolutions is available only when the servo amplifier of software
version B1 or later is used. For the servo amplifier of software version older than BI, an error
excessive alarm occurs when the deviation (deviation counter value) between the instructed position
and the actual servo motor position exceeds the parameter No. 1 setting value (initial value: 8
revolutions).