Mazak VTC-160A, Maintenance Manual, Page: 58 / 96

5-4
5-2 X-axis, Y-axis, Z-axis
5-2-1 Troubleshooting
Symptom Check Points and Probable Causes Corrective Action Refer to
• Positioning cannot be made
accurately.
1. Bolts of axis drive parts (ball
screw, coupling, linear guide,
etc.) are loose.
Contact Mazak Technical Center.
－
2. The encoder in the servomotor is
defective.
1. The bolts fixing the zero-point
return limit switch are loose.
Contact Mazak Technical Center.
－
• Zero-point position is not fixed or
the limit switch does not function
correctly.
2. The bolts fixing the zero-point
dog are loose.
1. Load is excessively large. Reduce load applied to the spindle.
－
2. Ambient temperature of the
servo control unit is higher than
40
°
C (104
°
F).
Lower the ambient temperature. 6-2-1
•
An axis stops due to alarm.
3. The servo control unit in the
electrical control cabinet is
defective.
Contact Mazak Technical Center.
－
4. The servomotor is defective.
•
Abnormal noise is generated
during axis movement.
1. The wiper at the slideway cover
is damaged.
Change the wiper. 4-6-2
2. The slideway cover is defective. Contact Mazak Technical Center.
－
3. A trouble in the axis drive system
such as damaged ball screw
support bearing.
5-2-2 Construction of the Axis Drive Systems
Y- axis drive AC servomotor
Y- axis linear guide
Saddle
Y- axis drive AC servomotor
Z- axis linear guide
Spindle
Z- axis ball screw
Y- axis ball screw
Y- axis drive AC servomotor
X- axis ball screw
X- axis linear guide
Table
Base
Column
Fig. 5-2 Construction of the Axis Drive Systems
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