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9. TROUBLESHOOTING
Display
IFU DRU
Name Definition Cause Action
1. Input command pulse frequency is
too high.
Set the command pulse 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. Reset 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.
(DRU parameter No. 3
4)
Set correctly.
@A.31@ Overspeed Speed has exceeded
the instantaneous
permissible speed.
5. Encoder faulty. Change the servo motor.
1. Short occurred in drive unit output
phases U, V and W.
Correct the wiring.
2. Transistor of the servo drive unit
faulty.
Checking method
Alarm (A.32) occurs if power is
switched on after disconnection of
the U, V, W power cables.
Change the drive unit.
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 drive unit.
4. External noise caused the
overcurrent detection circuit to
misoperate.
Take noise suppression
measures.
1. Regenerative brake option is not
used.
Use the regenerative brake
option.
2. Though the regenerative brake
option is used, the IFU parameter
No. 1 setting is "
00 (not used)".
Make correct setting.
3. Regenerative brake option is open or
disconnected.
1. Change lead.
2. Connect correctly.
4. Regenerative transistor faulty. Change drive unit.
5. Wire breakage of regenerative brake
option.
For wire breakage of regenerative
brake option, change regenerative
brake option.
FA.33 Overvoltage Converter bus voltage
exceeded 400VDC.
6. Power supply voltage high. Review the power supply.
1. Command given is greater than the
maximum speed of the servo motor.
Review operation program.
2. Noise entered bus cable. Take action against noise.
@A.35@ Command pulse
frequency error
Input frequency of
command pulse is too
high.
3. Servo system controller failure. Change the servo system
controller.