Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 153

(9) Alarm No.
[Details] The motor speed exceeded 115% of the value set in the spindle parameter (SP017:
TSP).
Investigation items
1 Investigate
repeatability.
2 Check the spindle
parameter (SP017:
TSP) setting value.
3 If the alarm occurs
during synchronous
tap, check the spindle
parameter (SP193:
SPECT) setting value
and tap time constant.
4 Investigate the wiring
and installation
environment.
grounded?
1) Is the unit correctly? 1) The grounding is incomplete.
2) Is there any device
that produces noise
around the unit?
3) Are the speed and
position detector
cables correctly
shielded?
11. Troubleshooting
31 : OVERSPEED
Investigation results
The alarm only occurs during the
speed loop operation.
The alarm only occurs during the
position loop.
The alarm occurs constantly.
The setting value is 2000 or less.
The setting value is 2001 or more.
The SP193 bit5 (position detection
polarity) setting is incorrect. Or, the
tap time constant setting value is
small.
The setting value is correct.
2) The alarm occurs easily when a
specific device is operated.
3) The cables are not correctly
shielded.
No particular problem.
Investigate item 2, and carry out the
appropriate measures.
Investigate item 3, and carry out the
appropriate measures.
Investigate item 4, and carry out the
appropriate measures.
Increase the setting value.
Investigate item 4, and carry out the
appropriate measures.
Set the correct value.
Investigate item 4, and carry out the
appropriate measures.
Correctly ground the unit.
Execute noise countermeasures for
the device at the left.
Correctly shield the cables.
Replace the spindle drive unit.
11 − 9
Remedy