Troubleshooting The Spindle System When There Is No Alarm Or Warning - Mitsubishi MELDAS MDS-C1 Instruction Manual

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
Check the wiring around the spindle
drive unit.
1 Also check for loosening in the
terminal screws and disconnec-
tions, etc.
2 Check the input voltage.
3 Check all of the spindle parameters.
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
4
at least one second after READY
is turned ON.
• Check whether the forward run
and reverse run signals are turned
ON simultaneously.
5 Check the speed command.
(2) No fault is displayed, but the motor only rotates slowly, or a large noise is heard from the
motor.
Investigation item
Check the U, V and W wiring
1 between the spindle drive unit and
motor.
2 Check the input voltage.
3 Check the speed command.
Tug on the connector by hand to
check whether the speed detector
4
connector (drive unit side and speed
detector side) is loose.
Turn the power OFF, and check the
5 connection of the speed detector
cable with a tester.
6. Troubleshooting
Investigation results
The wiring is incorrect, the screws
are loose, or the cables are
disconnected.
No particular problems found.
The voltage is exceeding the
specification value.
The voltage is within the
specification value.
The correct values are not set.
The correct values are set.
The signals are not input or the
sequence is incorrect.
The orientation command is input.
No particular problems found.
The speed command is not input
correctly.
The speed command is input
correctly.
Investigation results
The wires are not connected
correctly.
The wires are connected correctly.
One of the three phases is not
within the specification value.
No particular problems found.
The speed command is not input
correctly.
The speed command is input
correctly.
The connector is disconnected (or
loose).
The connector is not disconnected
(or loose).
The connection is faulty or
disconnected.
The connection is normal.
6 - 44
Remedies
Correctly wire. Correctly tighten
the screws. Replace the cables.
Investigate investigation item 2
and remedy.
Restore the power to the correct
state.
Investigate investigation item 3
and remedy.
Set the correct values.
Investigate investigation item 4
and remedy.
Correct the input signals.
Investigate investigation item 5
and remedy.
Input the correct speed
command.
Replace the unit.
Remedies
Correctly connect.
Investigate investigation item 2
and remedy.
Restore the power to the correct
state.
Investigate investigation item 3
and remedy.
Check the NC and PLC sequence.
Investigate investigation item 4
and remedy.
Correctly connect the connector.
Investigate investigation item 5
and remedy.
Replace the detector cable.
Correct the connection.
Replace the drive unit.