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