Mitsubishi Electric MDS-B-SPJ2 Series Specification Manual page 166

(2) No error is displayed, but the motor will only rotate slowly. Or, there is a noise coming
from the motor.
Investigation items
1 Check the U, V, W
wiring between the
spindle drive unit and
motor.
2 Check the input
voltage.
3 Check the speed
command
4 Jiggle the speed
detector connector
(spindle drive unit side
and speed detector
side) to see whether it
is coming loose.
5 Turn the power OFF,
and check the speed
detector cable
connection with a
tester.
(3) The speed command and actual speed do not match.
Investigation items
1 Check the speed
command.
2 Check for slippage
between the motor
and spindle (when
connected with a belt
or clutch).
3 Check the spindle
parameters (SP034,
SP040, SP017, SP257
and following).
11. Troubleshooting
Investigation results
The wiring is not connected correctly. Wire correctly.
The wiring is connected correctly.
One of the values in the three
phases is outside the specification
values. No particular problem.
The speed command is not input
correctly.
The speed command is input
correctly.
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
The speed command is not input
correctly.
The speed command is correct.
There is slippage.
No particular problem.
The correct value is not set.
The correct value is set.
11 − 22
Remedy
Investigate item 2, and carry out the
appropriate measures.
Return the voltage to the correct
value. Investigate item 3, and carry
out the appropriate measures.
Investigate item 4, and carry out the
appropriate measures.
Investigate item 5, and carry out the
appropriate measures.
Replace the detector cable. Correctly
connect the cable.
Replace the unit.
Remedy
Correctly input the speed command.
Investigate item 2, and carry out the
appropriate measures.
Correct the machine side.
Investigate item 3, and carry out the
appropriate measures.
Set the correct value.
Replace the spindle drive unit.