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10. TROUBLESHOOTING
Display Name Definition
Cause
Action
A31 Overspeed Speed has exceeded
the instantaneous
permissible speed.
1. Input command pulse frequency
exceeded the permissible
instantaneous speed frequency.
Set command pulses correctly.
2. Small acceleration/deceleration time
constant caused overshoot to be
large.
Increase acceleration/deceleration time
constant.
3. Servo system is instable to cause
overshoot.
1. Re-set servo gain to proper value.
2. If servo gain cannot be set to proper
value.
1) Reduce load inertia moment ratio; or
2) Reexamine acceleration/
deceleration time constant.
4. Electronic gear ratio is large
(parameters No. PA06, PA07)
Set correctly.
5. Encoder faulty. Change the servo motor.
A32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier. (When the
alarm (A32) occurs,
switch the power
OFF and then ON to
reset the alarm.
Then, turn on the
servo-on. When the
alarm (A32) still
occurs at the time,
the transistor (IPM
IGBT) of the servo
amplifier may be at
fault. Do not switch
the power OFF/ON
repeatedly; check
the transistor
according to the
cause 2 checking
method.)
1. Short occurred in servo motor
power (U, V, W).
Correct the wiring.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (A32) occurs if power is
switched on after U,V and W are
disconnected.
Change the servo amplifier.
3. Ground fault occurred in servo
motor power (U, V, W).
Correct the wiring.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.