2 INSTALLATION
2.8 Parts with a service life
19
2
2.8
Parts with a service life
The service life of the following parts is listed below. If any fault is found in a part, replace it immediately because its service
life varies. For parts replacement, please contact your local sales office.
Bearings
When the motor is run at rated speed and at rated load, bearings should be changed in 20000 to 30000 hours as a guideline.
As this differs depending on the operating conditions, the bearings must also be changed if unusual noise or vibration occurs
during inspection.
Oil seal
Oil seals must be changed in 5000 hours of operation at rated speed as a guideline. This differs depending on the operating
conditions. The oil seals must also be changed if oil leakage a similar problem is found during inspection. Even if the oil seal
on the rotary servo motor makes noises during operation, it does not indicate a problem with the functions.
2.9
Machine accuracy
The following table shows the machine accuracy of the output shaft and mounting parts of the rotary servo motor.
Part name
Recommended service life
Bearings
20000 hours to 30000 hours
Encoder
20000 hours to 30000 hours
Oil seal
5000 hours
Accuracy [mm]
Measuring position
Flange size
□
Less than 100
□
130
□
176
Runout of flange surface to output shaft
a)
0.05
0.06
0.08
Runout of fitting OD of flange surface
b)
0.04
0.04
0.06
Runout of output shaft end
c)
0.02
0.02
0.03
c)
a) A
A
A
b)
