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6. Troubleshooting
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[7] The spindle coasts during deceleration.
Investigation item Investigation results Remedies
There is slipping. Repair the machine side.
1
Check whether there is slipping between
the motor and spindle. (When connected
with a belt or clutch.)
No particular problems found. Replace the drive unit.
[8] The rotation does not stabilize.
Investigation item Investigation results Remedies
The rotation stabilizes when the settings
values are both set to approx. double.
Change the setting value.
Note that the gear noise may
increase.
1
Check the spindle parameter settings.
(SP022, SP023)
The symptoms do not change even
when the above value is set.
Return the setting values to the
original values.
Investigate investigation item 2 and
remedy.
The connector is disconnected (or
loose).
Correctly connect the connector.
2
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 3 and
remedy.
The connection is faulty or
disconnected.
Replace the detector cable.
Correct the connection.
3
Turn the power OFF, and check the
connection of the speed detector cable
with a tester.
(Especially check the shield wiring.)
The connection is normal.
Investigate investigation item 4 and
remedy.
The grounding is incomplete. Correctly ground.
The alarm occurs easily when a specific
device operates.
Use noise measures on the device
described on the left.
4
Investigate the wiring and installation
environment.
• Is the ground correctly connected?
• Are there any noise-generating devices
near the drive unit?
No particular problems found. Replace the drive unit.
[9] The speed does not rise above a set level.
Investigation item Investigation results Remedies
The speed command is not input
correctly.
Input the correct speed command.
1
Check the speed command.
Check whether the override input is input
from the machine operation panel.
The speed command is input correctly.
Investigate investigation item 2 and
remedy.
The load has become heavier. Repair the machine side.
2
Check whether the load has suddenly
become heavier.
No particular problems found.
Investigate investigation item 3 and
remedy.
The bearings do not rotate smoothly. Replace the spindle motor.
3
Manually rotate the motor bearings and
check the movement.
The bearings rotate smoothly.
Investigate investigation item 4 and
remedy.
The connector is disconnected (or
loose).
Correctly connect the connector.
4
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 5 and
remedy.
The connection is faulty or
disconnected.
Replace the detector cable.
Correct the connection.
5
Turn the power OFF, and check the
connection of the speed detector cable
with a tester.
(Especially check the shield wiring.)
The waveform is normal. Replace the spindle drive unit.