Mitsubishi MELDAS MDS-C1 Instruction Manual page 291

(7) The spindle coasts during deceleration.
Investigation item
Check whether there is slipping
between the motor and spindle.
1
(When connected with a belt or
clutch.)
(8) The rotation does not stabilize.
Investigation item
Check the spindle parameter
1
settings. (SP022, SP023)
Tug on the connector by hand to
check whether the speed detector
2
connector (spindle drive unit side
and speed detector side) is loose.
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 Is the ground correctly connected?
•
Are there any noise-generating
devices near the drive unit?
(9) The speed does not rise above a set level.
Investigation item
Check the speed command.
Check whether the override input is
1
input from the machine operation
panel.
Check whether the load has
2
suddenly become heavier.
Manually rotate the motor bearings
3
and check the movement.
Tug on the connector by hand to
check whether the speed detector
4
connector (spindle drive unit side
and speed detector side) is loose.
Turn the power OFF, and check the
connection of the speed detector
5
cable with a tester.
(Especially check the shield wiring.)
6. Troubleshooting
Investigation results
There is slipping.
No particular problems found.
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 or
disconnected.
The connection is normal.
The grounding is incomplete.
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 or
disconnected.
The waveform is normal.
6 - 46
Remedies
Repair the machine side.
Replace the drive unit.
Remedies
Change the setting value.
Note that the gear noise may
increase.
Return the setting values to the
original values.
Investigate investigation item 2
and remedy.
Correctly connect the connector.
Investigate investigation item 3
and remedy.
Replace the detector cable.
Correct the connection.
Investigate investigation item 4
and remedy.
Correctly ground.
Use noise measures on the
device described on the left.
Replace the drive unit.
Remedies
Input the correct speed
command.
Investigate investigation item 2
and remedy.
Repair the machine side.
Investigate investigation item 3
and remedy.
Replace the spindle motor.
Investigate investigation item 4
and remedy.
Correctly connect the connector.
Investigate investigation item 5
and remedy.
Replace the detector cable.
Correct the connection.
Replace the spindle drive unit.