YASKAWA SIEMENS CNC Series, Maintenance Manual, Serviceman Handbook

Page: 326 / 373

15.1 Errors without Alarm Display and Troubleshooting
15-3
Servo motor overheats. The surrounding temperature is
excessively high. Measure the temperature around
the servo motor. Lower the surrounding tempera-
ture to 40
℃
or below.
The surface of servo motor is
dirty. Visually check the surface. Remove the dust and oil from
the motor surface.
The servo motor is overloaded. Operate the servo motor without
load. Reduce the load or use another
motor with larger capacity.
Unusual noise generates. Mechanical installment is not
good. Check if the fixing screws of
servo motor are not loosen. Fasten the fixing screw again.
Check if the alignment of cou-
pling is deviate. Align the coupling.
Check if the coupling is unbal-
anced. Balance the coupling.
There is something abnormal on
the bearing. Check the noise and vibration
around the bearing. When you find something
wrong about the bearing, contact
our service group.
The coupled machine generates
vibration. Check if there is any foreign
matters, failure and/or deforma-
tion on the movable parts of the
machine. When you find any, take advice
from the maker of that machine.
Table 15.1
Malfunction Cause Check point Countermeasure