Mitsubishi Electric M700VS Series Setup Manual page 658

[6] The rotation does not stabilize.
Investigation item
Check the spindle parameter SP005
1
(SP008) settings.
Manually shake the speed detector
connectors (spindle drive unit side
2
and speed detector side) to check if
they are disconnected.
Turn the power OFF, and check the
connection of the speed detector
3
cable with a tester.
(Especially check the shield wiring.)
Investigate the wiring and installation
environment.
4 1) Is the ground correctly connected?
2) Are there any noise-generating
devices near the drive unit?
[7] The speed does not rise above the command speed sometimes.
Investigation item
Check the speed command.
Check whether the override input is
1
input from the machine operation
panel.
Check whether the load has suddenly
2
become heavier.
Manually rotate the motor bearings
3
and check the movement.
Manually shake the speed detector
connectors (spindle drive unit side
4
and speed detector side) to check if
they are disconnected.
Turn the power OFF, and check the
connection of the speed detector
5
cable with a tester.
(Especially check the shield wiring.)
Investigation results
The rotation stabilizes when the
settings values are both set to
approx. double.
The symptoms do not change even
when the above value is set.
The connector is disconnected (or
loose).
The connector is not disconnected
(or loose).
The connection is faulty.
The connection is normal.
1) The grounding is incomplete.
2) The alarm occurs easily when a
specific device operates.
No particular problems found.
Investigation results
The speed command is not input
correctly.
The speed command is input
correctly.
The load has become heavier.
No particular problems found.
The bearings do not rotate
smoothly.
The bearings rotate smoothly.
The connector is disconnected (or
loose).
The connector is not disconnected
(or loose).
The connection is faulty.
The waveform is normal.
M700VS Series Setup Manual
Appendix 2.13 Troubleshooting
Remedies
Change the setting value.
Note that the gear noise may
increase.
Return the setting values to the
original values.
Check the investigation item No. 2.
Correctly connect the connector.
Check the investigation item No. 3.
Replace the detector cable.
Correct the connection.
Check the investigation item No. 4.
Correctly ground.
Use noise measures on the device
described on the left.
Replace the spindle drive unit.
Remedies
Input the correct speed command.
Check the investigation item No. 2.
Repair the machine side.
Check the investigation item No. 3.
Replace the spindle motor.
Check the investigation item No. 4.
Correctly connect the connector.
Check the investigation item No. 5.
Replace the detector cable.
Correct the connection.
Replace the spindle drive unit.
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