6. Troubleshooting
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6-4-4 Troubleshooting the spindle system when there is no alarm or warning
If an abnormality is observed in the spindle system but no alarm or warning has occurred, refer to the
following table and check the state.
(1) No abnormality is displayed, but the motor does not rotate.
Investigation item Investigation results Remedies
The wiring is incorrect, the screws
are loose, or the cables are
disconnected.
Correctly wire. Correctly tighten
the screws. Replace the cables.
1
Check the wiring around the spindle
drive unit.
Also check for loosening in the
terminal screws and disconnec-
tions, etc.
No particular problems found.
Investigate investigation item 2
and remedy.
The voltage is exceeding the
specification value.
Restore the power to the correct
state.
2 Check the input voltage.
The voltage is within the
specification value.
Investigate investigation item 3
and remedy.
The correct values are not set. Set the correct values.
3 Check all of the spindle parameters.
The correct values are set.
Investigate investigation item 4
and remedy.
The signals are not input or the
sequence is incorrect.
The orientation command is input.
Correct the input signals.
4
Check the input signals.
• Are the READY, forward run and
reverse run signals input?
• In particular, the forward run and
reverse run signals must be input
at least one second after READY
is turned ON.
• Check whether the forward run
and reverse run signals are turned
ON simultaneously.
No particular problems found.
Investigate investigation item 5
and remedy.
The speed command is not input
correctly.
Input the correct speed
command.
5 Check the speed command.
The speed command is input
correctly.
Replace the unit.
(2) No fault is displayed, but the motor only rotates slowly, or a large noise is heard from the
motor.
Investigation item Investigation results Remedies
The wires are not connected
correctly.
Correctly connect.
1
Check the U, V and W wiring
between the spindle drive unit and
motor.
The wires are connected correctly.
Investigate investigation item 2
and remedy.
2 Check the input voltage.
One of the three phases is not
within the specification value.
No particular problems found.
Restore the power to the correct
state.
Investigate investigation item 3
and remedy.
The speed command is not input
correctly.
Check the NC and PLC sequence.
3 Check the speed command.
The speed command is input
correctly.
Investigate investigation item 4
and remedy.
The connector is disconnected (or
loose).
Correctly connect the connector.
4
Tug on the connector by hand to
check whether the speed detector
connector (drive unit side and speed
detector side) is loose.
The connector is not disconnected
(or loose).
Investigate investigation item 5
and remedy.
The connection is faulty or
disconnected.
Replace the detector cable.
Correct the connection.
5
Turn the power OFF, and check the
connection of the speed detector
cable with a tester.
The connection is normal. Replace the drive unit.
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