Check Of Servomotor And Servo Unit; Check Of Servomotor - Siemens YASKAWA 840DI Maintenance Manual

2.2

Check of Servomotor and Servo Unit

2.2.1

Check of Servomotor

The following table shows how to conduct a daily check and maintenance of the Servomotor.
Since AC Servomotors are brushless, you need not conduct any other checks than a brief daily
check. The check timing in the table shows a guideline only; you need to define appropriate
check timing according to the motor operating conditions.
Do not disassemble the Servomotor for the purpose of maintenance and check.
IMPORTANT
Be sure to contact our distributor or sales office nearest to you for disassembly of motor.
Vibration and sound
check
Appearance check
Insulation resistance
measurement
Oil seal replacement
Overall check
* To be measured between FG and either of the motor power line U, V, and W phases.
Check item Check timing
Once per day
According to the
degree of
contamination
Once per year at least
Once per 5,000 hours
at least
Once per 20,000 hours
or 5 years at least
Table 2.1 Check of Servomotor
Check/maintenance
method
Touching and hearing.
Cleaning with a cloth or
air
Isolating the motor from
Servo Unit, measure
insulation resistance using
a 500 V megger tester.
Normal resistance is more
than 10 MΩ. *
Replace the seal by
removing the motor from
a machine.
Contact our service group. Do not disassemble
2-3

2.2 Check of Servomotor and Servo Unit

Remark
Shall not be larger
than normal
−
If the resistance is 10
MΩ or less, contact
our service group.
Only for a motor with
an oil seal.
and clean the
Servomotors.