Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 168

(6) There is a lot of vibration and noise (gear sound).
Investigation items
1 Check the machine
dynamic balance.
(Try coasting from
max. speed.)
2 Check whether there
is a resonance point
on the machine side.
(Try coasting from
max. speed.)
3 Check for machine
backlash.
4 Check the spindle
parameter (SP022:
VGNP1, SP023:
VGNI1, and SP056:
PYVR) settings.
5 Jiggle the speed
detector connector
(spindle drive unit side
and speed detector
side) to see whether it
is coming loose.
6 Turn the power OFF,
and check the speed
detector cable
connection with a
tester.
(7) The spindle coasts during deceleration.
Investigation items
1 Check for slippage
between the motor
and spindle (when
connected by a belt or
clutch).
11. Troubleshooting
Investigation results
The sound is the same during
coasting.
No particular problem.
The vibration and noise increase at a
certain speed during coasting.
No particular problem.
There is a large backlash.
No particular problem.
The noise and vibration decrease if
the values are halved.
The vibration and noise do not
change when the setting values are
changed as above.
Connector came (was coming) loose. Install correctly.
Connectors are normal.
The connection is faulty, or there is a
broken wire.
The connection is normal.
Investigation results
There is slippage.
No particular problem.
11 − 24
Remedy
Correct the machine side.
Investigate item 2, and carry out the
appropriate measures.
Correct the machine side.
Investigate item 3, and carry out the
appropriate measures.
Correct the machine side.
Investigate item 4, and carry out the
appropriate measures.
Change the setting values. Note that
the impact response will decrease,
so caution is required.
Return the setting to the original
value. Investigate item 5, and carry
out the appropriate measures.
Investigate item 6, and carry out the
appropriate measures.
Replace the detector cable. Correctly
connect the cable.
Replace the unit.
Remedy
Correct the machine side.
Replace the unit.