Mitsubishi MELDAS MDS-C1

6. Troubleshooting
6 - 46
(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.