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MDS-D-SVJ3/SPJ3 Series Instruction Manual
6-3 Troubleshooting
[6] The rotation does not stabilize.
[7] The speed does not rise above the command speed sometimes.
Investigation item Investigation results Remedies
1
Check the spindle parameter SP005
(SP008) settings.
The rotation stabilizes when the
settings values are both set to ap-
prox. double.
Change the setting value.
Note that the gear noise may in-
crease.
The symptoms do not change
even when the above value is set.
Return the setting values to the
original values.
Check the investigation item No. 2.
2
Manually shake the speed detector
connectors (spindle drive unit side
and speed detector side) to check if
they are disconnected.
The connector is disconnected (or
loose).
Correctly connect the connector.
The connector is not disconnected
(or loose).
Check the investigation item No. 3.
3
Turn the power OFF, and check the
connection of the speed detector ca-
ble with a tester.
(Especially check the shield wiring.)
The connection is faulty.
Replace the detector cable.
Correct the connection.
The connection is normal. Check the investigation item No. 4.
4
Investigate the wiring and installa-
tion environment.
1) Is the ground correctly connect-
ed?
2) Are there any noise-generating
devices near the drive unit?
1) The grounding is incomplete. Correctly ground.
2) The alarm occurs easily when a
specific device operates.
Use noise measures on the device
described on the left.
No particular problems found. Replace the spindle drive unit.
Investigation item Investigation results Remedies
1
Check the speed command.
Check whether the override input is
input from the machine operation
panel.
The speed command is not input
correctly.
Input the correct speed command.
The speed command is input cor-
rectly.
Check the investigation item No. 2.
2
Check whether the load has sudden-
ly become heavier.
The load has become heavier. Repair the machine side.
No particular problems found. Check the investigation item No. 3.
3
Manually rotate the motor bearings
and check the movement.
The bearings do not rotate
smoothly.
Replace the spindle motor.
The bearings rotate smoothly. Check the investigation item No. 4.
4
Manually shake the speed detector
connectors (spindle drive unit side
and speed detector side) to check if
they are disconnected.
The connector is disconnected (or
loose).
Correctly connect the connector.
The connector is not disconnected
(or loose).
Check the investigation item No. 5.
5
Turn the power OFF, and check the
connection of the speed detector ca-
ble with a tester.
(Especially check the shield wiring.)
The connection is faulty.
Replace the detector cable.
Correct the connection.
The waveform is normal. Replace the spindle drive unit.