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10. TROUBLESHOOTING
Display Name Definition Cause Action
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. 3, 4)
Set correctly.
AL.31 Overspeed Speed has exceeded
the instantaneous
permissible speed.
5. Encoder faulty. Change the servo motor.
1. Short occurred in servo amplifier
output phases U, V and W.
Correct the wiring.AL.32 Overcurrent Current that flew is
higher than the
permissible current
of the servo
amplifier.
2. Transistor (IPM) of the servo
amplifier faulty.
Checking method
Alarm (AL.32) occurs if power is
switched on after U,V and W
are disconnected.
Change the servo amplifier.
3. Ground fault occurred in servo
amplifier output phases U, V and
W.
Correct the wiring.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
1. Lead of built-in regenerative brake
resistor or regenerative brake
option is open or disconnected.
1. Change lead.
2. Connect correctly.
2. Regenerative transistor faulty. Change servo amplifier
3. Wire breakage of built-in
regenerative brake resistor or
regenerative brake option
1. For wire breakage of built-in
regenerative brake resistor, change
servo amplifier.
2. For wire breakage of regenerative brake
option, change regenerative brake
option.
4. Capacity of built-in regenerative
brake resistor or regenerative
brake option is insufficient.
Add regenerative brake option or increase
capacity.
AL.33 Overvoltage Converter bus
voltage exceeded
400V.
5. Power supply voltage high. Review the power supply.