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XYZ Machine Tools Ltd
TRAK
2
OP
Installation, Maintenance, Service & Part List Manual
4.7.3
Spindle Motor Hums or Will Not Run
The spindle motor makes a constant humming noise during operation or will not turn on. This machine can
be wired for 220 or 440 volts. Make sure the voltage matches the AC spindle drive.
DANGER!
Take extreme caution when working with high voltage. There is possibility of death by electrocution!
Possible Cause
Check This
Wrong voltage
Check the voltage to the machine before and after the Spindle Drive
with a Voltmeter. Also, check the voltage to the Spindle Drive (L1,
L2, and L3).
Poor wiring connections
Check all the wiring connections to the Spindle Drive and Spindle
Motor. See section 6.9 for a wiring diagram for the spindle motor.
Spindle Motor is faulty
Check the resistance of the spindle motor windings between L1 (U)
and L2 (V), L2 (V) and L3 (W), then L1 (U) and L3 (W) using a
digital ohmmeter. If the ohmmeter reads more than one ohm
difference or “OL” (infinite) between any pair, replace the motor.
Check for isolation to ground using a digital ohmmeter. Check L1
(U) to ground, L2 (V) to ground, and L3 (W) to ground. The meter
reading should be “OL” (infinite). Any other reading indicates a
problem, and the motor should be replaced.
Spindle Drive may be in "Local
Mode" and cannot be run from the
Pendant
On the Spindle Drive, push the "PU". If the PU letters under the
display are red, then the drive is in local mode. Press the PU button
once again to turn this feature off.
Spindle Drive contains incorrect
parameters and is not
programmed correctly
Contact customer service.
4.7.4
Spindle Runs Backwards
The spindle motor runs in the opposite direction. The direction should be set at the factory and so this
should not be the case in the field. Since the spindle motor is run with an AC drive, switching the power
wires coming into the machine will have no effect on direction.
DANGER!
Take extreme caution when working with high voltage. There is possibility of death by electrocution!
Possible Cause
Check This
3-Phase wires backwards
Switch any 2 of the 3 wires either coming out of the AC Drive (T1,
T2 & T3) or going into the Spindle Motor (U, V & W). Caution: Be
sure to shut off all power to the machine before attempting to
switch any wires.
Control wiring to AC drive
incorrect.
Verify that the control wiring to the AC Drive is correct and that the
correct command is given. See section 5.6
4.7.5
Head Noise
Head noise pertains to any unusual noises coming from the head under load and no load situations. Most
often head noise will only be noticeable under load situations. It is important to try to distinguish between
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