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2.7
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, contact your local sales office.
Part name
Bearings
Encoder
Absolute position storage unit (option)
When the motor is run at rated speed and at rated load, bearings should be changed every 20,000 to 30,000 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.
2.8
Machine accuracy
The following table indicates the machine accuracy of the rotor (output shaft) and the mounting area of the direct drive motor
(except special products).
Item
Runout of mounting surface to rotor (output shaft)
Runout of fitting OD of mounting surface
Runout of rotor (output shaft)
Runout of rotor (output shaft) end surface
Reference diagram
a A
b A
2 INSTALLATION
14
2.7 Parts with a service life
Recommended service life
20,000 hours to 30,000 hours
20,000 hours to 30,000 hours
20,000 hours to 30,000 hours
Measuring position
a
b
c
d
d
A
c
Remark
The service lives in the "Recommended service life" column are
reference times.
If any fault is found before this time is reached, the part must be
changed.
Accuracy [mm]
0.05
0.07
0.04
0.02
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