Mazak VTC-160A, Maintenance Manual, Page: 56 / 96

5-2
5-1 Spindle
5-1-1 Troubleshooting
Symptom Check Points and Probable Causes Corrective Action Refer to
• Spindle does not start.
• Spindle stops due to alarm.
1. Insufficient capacity or a trouble
of external power supply
Prepare the power supply which
meets the requirements indicated in
6-2-2 “External Power Source
Requirements”. 6-2-2
2. Ambient temperature of the
spindle drive unit is higher than
40
° C (104 ° F).
Lower the ambient temperature.
－
3. Load is excessively large. Reduce load applied to the spindle.
－
4. Load is excessively large.
The spindle drive unit is
defective.
The spindle drive motor is
defective.
Contact Mazak Technical Center.
－
• Spindle orientation does not
complete.
•
Spindle orientation status cannot
be canceled.
1. The spindle drive unit is
defective.
The spindle drive motor is
defective.
There is a trouble in the spindle.
Contact Mazak Technical Center.
－
• There is abnormal noise or
abnormal vibration during spindle
rotation.
1. The spindle is rotating at a high
speed with an unbalanced tool
mounted in it.
Change the tool with a balanced tool.
－
2. The spindle drive unit is
defective.
The spindle drive motor is
defective.
Loose bolts
Contact Mazak Technical Center.
－
1. The sensor is defective.
(Although the clamp/unclamp
cylinder operates correctly, the
sensor is not turned on.)
Change the sensor. 5-10-3
•
Tool clamp operation is not
completed.
•
Tool unclamp operation is not
completed.
2. The sensor is not mounted
securely.
(Gap between the sensor and
the dog is larger than 0.5 mm
(0.020 in.).)
Mount the sensor correctly.
3. The hydraulic valve is defective
or blocked.
(The clamp/unclamp cylinder
fails to operate).
Contact Mazak Technical Center.
－
4. The clamp/unclamp cylinder is
defective.
(The clamp/unclamp cylinder
does not operate although the
hydraulic valve has no
problems.)
5. The hydraulic unit is defective.
(Hydraulic pressure is always
lower than 70 kgf/cm2 (996.1
PSI).)
6. Loose bolts
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