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9. TROUBLESHOOTING
Display Name Definition Cause Action
1. Command given is greater than
the maximum speed of the servo
motor.
Review opration program.
2. Noise entered bus cable. Take action against noise.
35 Command
frequency error
Input frequency of
command pulse is
too high.
3. Servo system controller failure Change the servo system controller.
1. Bus cable is disconnected. Connect the connector of the bus cable.
2. Bus cable fault. Change the cable.
3. Printed board is faulty. Change the servo amplifier
36 Transfer error Bus cable or printed
board is faulty
4. Terimination connector
disconnected
Connect termination connector.
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.37 Parameter error Parameter setting is
wrong.
2. There is a parameter whose value
was set to outside the setting
range by the controller.
Change the parameter value to within the
setting range.
1. Servo amplifier faulty. Change the servo amplifier.
2. The power supply was turned on
and off continuously by overloaded
status.
The drive method is reviewed.
45 Main circuit
device overheat
Main circuit device
overheat
3. Air cooling fan of servo amplifier
stops.
1. Change the servo amplifier or cooling
fan.
2. Reduce ambient temperature.
1. Ambient temperature of servo
motor is over 40
.
Review environment so that ambient
temperature is 0 to 40 .
2. Servo motor is overloaded. 1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
46 Servo motor
overheat
Servo motor
temperature rise
actuated the
thermal protector.
3. Thermal protector in encoder is
faulty.
Change servo motor.
1. Servo amplifier is used in excess
of its continuous output current.
1. Reduce load.
2. Review operation pattern.
3. Use servo motor that provides larger
output.
2. 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.
3. Machine struck something. 1. Review operation pattern.
2. Install limit switches.
4. 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.
50 Overload 1 Load exceeded
overload protection
characteristic of
servo amplifier.
Load ratio 300%:
2.5s or more
Load ratio 200%:
100s or more
5. 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.