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9. TROUBLESHOOTING
Display Name Definition Cause Action
1. Pulse frequency of the command
pulse is too high.
Change the command pulse frequency to a
proper value.
2. Noise entered command pulses.
Take action against noise.
A. 35 Command
pulse frequency
error
Input pulse
frequency of the
command pulse is
too high.
3. Command device failure
Change the command device.
A. 37 Parameter
error
Parameter setting is
wrong.
Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.
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.
A. 50 Overload 1 Load exceeded
overload protection
characteristic of
servo amplifier.
Load ratio 200%:
85s or more
5. Encoder faulty.
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.
Checking method
Change the servo motor.