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MDS-D-SVJ3/SPJ3 Series Instruction Manual
6-3 Troubleshooting
Alarm No.
31
Overspeed
The motor was detected to rotate at a speed exceeding the allowable speed (In the case of linear motor, it
was detected to move at a speed exceeding the allowable speed).
Investigation details Investigation results Remedies SV SP
1
Check if the unit in which the alarm
was detected is servo or spindle.
The alarm was detected in servo. Check the investigation item No. 2.
The alarm was detected in spindle. Check the investigation item No. 3.
2
Check the servo parameters SV001
(PC1), SV002 (PC2), SV018 (PIT) and
SV025 (MTYP) settings.
The settings are incorrect. Correctly set.
Correctly set. Check the investigation item No. 5.
3
Check the spindle parameter SP026
(TSP) setting.
The setting is incorrect.
The alarm is detected at 115% of
SP026.
Correctly set.
Correctly set. Check the investigation item No. 4.
4 Check the PLG output waveform.
There is a problem. Adjust the PLG output waveform.
Normal. Check the investigation item No. 5.
5
Check whether the speed waveform is
overshooting.
The waveform is overshooting.
Increase the acceleration/ decelera-
tion time constant.
Lower the load inertia.
The waveform is not overshooting.
Check if there is any abnormality in the
unit's ambient environment.
(Ex.: Ambient temperature, noise,
grounding)
Check the investigation item No. 6.
6 Check the repeatability.
[1] The alarm occurs when the motor is
stopped.
[2] The rotation speed displayed on
the drive monitor varies when the mo-
tor is stopped.
Replace the detector or detector ca-
ble.
The alarm occurs at all time. Replace the drive unit.