6. Troubleshooting
6 - 45
(3) The rotation speed command and actual rotation speed do not match.
Investigation item Investigation results Remedies
The speed command is not input
correctly.
Input the correct speed
command.
1 Check the speed command.
The speed command is correct.
Investigate investigation item 2
and remedy.
There is slipping. Repair the machine side.
2
Check whether there is slipping
between the motor and spindle.
(When connected with a belt or
clutch.)
No particular problems found.
Investigate investigation item 3
and remedy.
The correct values are not set. Set the correct values.
3
Check the spindle parameters
(SP017, SP034, SP040, SP257 and
following).
The correct values are set. Replace the drive unit.
(4) The starting time is long or has increased in length.
Investigation item Investigation results Remedies
The friction torque has increased. Repair the machine side.
1
Check whether the friction torque
has increased.
No particular problems found.
Investigate investigation item 2
and remedy.
The bearings do not rotate
smoothly.
Replace the spindle motor.
2
Manually rotate the motor bearings
and check the movement.
The bearings rotate smoothly.
Investigate investigation item 3
and remedy.
The signal has been input. Do not input this signal.
3
Check whether the torque limit
signal has been input.
The signal is not input. Replace the drive unit.
(5) The motor stops during cutting.
Investigation item Investigation results Remedies
The load meter sways past 120%
during cutting.
Reduce the load.
1 Check the load rate during cutting.
No particular problems found.
Investigate the same matters as
item (4), and remedy.
(6) The vibration and noise (gear noise), etc., are large.
Investigation item Investigation results Remedies
The same noise is heard during
coasting.
Repair the machine side.
1
Check the machine's dynamic
balance. (Coast from the maximum
speed.)
No particular problems found.
Investigate investigation item 2
and remedy.
Vibration and noise increase at a
set rotation speed during coasting.
Repair the machine side.
2
Check whether there is a resonance
point in the machine. (Coast from
the maximum speed.)
No particular problems found.
Investigate investigation item 3
and remedy.
The backlash is great. Repair the machine side.
3 Check the machine's backlash.
No particular problems found.
Investigate investigation item 4
and remedy.
Symptoms decrease when setting
value is set to approx. half.
Change the setting value.
Note that the impact response will
drop.
4
Check the spindle parameter
settings.
(SP022, SP023, SP056)
The symptoms do not change even
when the above value is set.
Return the setting values to the
original values.
Investigate investigation item 5
and remedy.
The connector is disconnected (or
loose).
Correctly connect the connector.
5
Tug on the connector by hand to
check whether the speed detector
connector (spindle drive unit side
and speed detector side) is loose.
The connector is not disconnected
(or loose).
Investigate investigation item 6
and remedy.
The connection is faulty or
disconnected.
Replace the detector cable.
Correct the connection.
6
Turn the power OFF, and check the
connection of the speed detector
cable with a tester.
The connection is normal. Replace the drive unit.
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