Mitsubishi MELDAS MDS-C1 Instruction Manual page 290

(3) The rotation speed command and actual rotation speed do not match.
Investigation item
1 Check the speed command.
Check whether there is slipping
between the motor and spindle.
2
(When connected with a belt or
clutch.)
Check the spindle parameters
3
(SP017, SP034, SP040, SP257 and
following).
(4) The starting time is long or has increased in length.
Investigation item
Check whether the friction torque
1
has increased.
Manually rotate the motor bearings
2
and check the movement.
Check whether the torque limit
3
signal has been input.
(5) The motor stops during cutting.
Investigation item
1 Check the load rate during cutting.
(6) The vibration and noise (gear noise), etc., are large.
Investigation item
Check the machine's dynamic
1 balance. (Coast from the maximum
speed.)
Check whether there is a resonance
2 point in the machine. (Coast from
the maximum speed.)
3 Check the machine's backlash.
Check the spindle parameter
4 settings.
(SP022, SP023, SP056)
Tug on the connector by hand to
check whether the speed detector
5
connector (spindle drive unit side
and speed detector side) is loose.
Turn the power OFF, and check the
6 connection of the speed detector
cable with a tester.
6. Troubleshooting
Investigation results
The speed command is not input
correctly.
The speed command is correct.
There is slipping.
No particular problems found.
The correct values are not set.
The correct values are set.
Investigation results
The friction torque has increased.
No particular problems found.
The bearings do not rotate
smoothly.
The bearings rotate smoothly.
The signal has been input.
The signal is not input.
Investigation results
The load meter sways past 120%
during cutting.
No particular problems found.
Investigation results
The same noise is heard during
coasting.
No particular problems found.
Vibration and noise increase at a
set rotation speed during coasting.
No particular problems found.
The backlash is great.
No particular problems found.
Symptoms decrease when setting
value is set to approx. half.
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.
6 - 45
Remedies
Input the correct speed
command.
Investigate investigation item 2
and remedy.
Repair the machine side.
Investigate investigation item 3
and remedy.
Set the correct values.
Replace the drive unit.
Remedies
Repair the machine side.
Investigate investigation item 2
and remedy.
Replace the spindle motor.
Investigate investigation item 3
and remedy.
Do not input this signal.
Replace the drive unit.
Remedies
Reduce the load.
Investigate the same matters as
item (4), and remedy.
Remedies
Repair the machine side.
Investigate investigation item 2
and remedy.
Repair the machine side.
Investigate investigation item 3
and remedy.
Repair the machine side.
Investigate investigation item 4
and remedy.
Change the setting value.
Note that the impact response will
drop.
Return the setting values to the
original values.
Investigate investigation item 5
and remedy.
Correctly connect the connector.
Investigate investigation item 6
and remedy.
Replace the detector cable.
Correct the connection.
Replace the drive unit.