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9. TROUBLESHOOTING
Display Name Definition Cause Action
1. Short occurred in servo amplifier
output phases U, V and W.
Correct the wiring.
2. Transistor (IPM) of the servo
amplifier faulty.
Alarm (A. 32) occurs if power is
switched on after U, V and W
are disconnected.
Checking method
Change the servo amplifier.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
Correct the wiring.
A. 32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
A. 33 Overvoltage Input value of
converter bus
voltage reached or
exceeded 35VDC.
Power supply voltage is outside the
permissible voltage range.
Change battery.
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.
1. Servo amplifier fault caused the
parameter setting to be rewritten.
Change the servo amplifier.A. 37 Parameter
error
Parameter setting is
wrong.
2. The number of write times to
EEP-ROM exceeded 100,000 due to
parameter write, etc.
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.
Checking method
When the servo motor shaft is
rotated with the servo off, the
cumulative feedback pulses do
not vary in proportion to the
rotary angle of the shaft but the
indication skips or returns midway.
Change the servo motor.