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9. TROUBLESHOOTING
Display Name Definition Cause Action
1. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
2. 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.
3. Servo system is instable and
hunting.
1. Repeat acceleration/deceleration to
execute auto tuning.
2. Change auto tuning response setting.
3. Set auto tuning to OFF and make gain
adjustment manually.
51 Overload 2 Machine collision or
the like caused max.
output current to
flow successively for
several seconds.
Servo motor locked:
1s or more
4. Encoder faulty.
Checking method
When the servo motor shaft is
rotated slowly with the servo off,
the cumulative feedback pulses
should vary in proportion to the
rotary angle. If the indication
skips or returns midway, the
encoder is faulty.
Change the servo motor.
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 Error excessive Droop pulse value of
the deviation
counter exceeded
the parameter
No.31 setting value
(initial value:
8 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 CN1A, CN1B
and CN3 connectors are
disconnected.
Change servo amplifier.