10 - 8
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.
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.
AL.32 Overcurrent
Current that flew is
higher than the
permissible current
of the servo
amplifier. (When the
alarm (AL.32)
occurs, switch the
power OFF and then
ON to reset the
alarm. Then, turn on
the servo-on. When
the alarm (AL.32)
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.)
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression measures.
1. Regenerative option is not used. Use the regenerative option.
2. Though the regenerative option is
used, the parameter No.0 setting is
"
0 (not used)".
Make correct setting.
3. Lead of built-in regenerative resistor
or regenerative option is open or
disconnected.
1. Change the lead.
2. Connect correctly.
4. Regenerative transistor faulty. Change the servo amplifier.
5. Wire breakage of built-in
regenerative resistor or regenerative
option
1. For wire breakage of built-in regenerative
resistor, change the servo amplifier.
2. For wire breakage of regenerative option,
change the regenerative option.
6. Capacity of built-in regenerative
resistor or regenerative option is
insufficient.
Add regenerative option or increase
capacity.
AL.33 Overvoltage Converter bus
voltage exceeded
400VDC.
7. Power supply voltage high. Check the power supply.
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