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MDS-D-SVJ3/SPJ3 Series Instruction Manual
6-3 Troubleshooting
6-3-5 Troubleshooting the spindle system when there is no alarm or warning
If an abnormality is observed in the spindle system but no alarm or warning has occurred, refer to the
following table and check the state.
[1] The rotation speed command and actual rotation speed do not match.
[2] The acceleration/deceleration time is long or has increased in length.
[3] The motor stops during cutting.
Investigation item Investigation results Remedies
1
Check the commanded speed and
the spindle rotation speed displayed
on the drive monitor screen.
The speed command is not input
correctly.
Input the correct speed command.
The speed command is correct. Check the investigation item No. 2.
2
Check whether there is slipping be-
tween the motor and spindle. (When
connected with a belt or clutch.)
There is slipping. Repair the machine side.
No particular problems found. Check the investigation item No. 3.
3
Check the spindle parameters
(SP026, SP129 and following).
The correct values are not set. Set the correct values.
The correct values are set. Replace the spindle drive unit.
Investigation item Investigation results Remedies
1
Check whether the friction torque or
load inertia has increased.
The friction torque has increased. Repair the machine side.
No particular problems found. Check the investigation item No. 2.
2
Check if there is any abnormality in
the motor's rotation during coasting.
The bearings do not rotate
smoothly.
Replace the spindle motor.
The bearings rotate smoothly. Check the investigation item No. 3.
3
Check whether the torque limit sig-
nal has been input.
The signal has been input. Release the input signal.
The signal is not input. Replace the drive unit.
Investigation item Investigation results Remedies
1
Check the load rate (load meter val-
ue) during cutting.
The load meter sways over 120%
during cutting.
Reduce the cutting amount.
No particular problems found. Check the investigation item No. 2.
2 Carry out the same investigations and remedies as section (4).