Siemens YASKAWA 830DI, Maintenance Manual, Page: 34 / 65

2.3 Check of Spindle Motor, Inverter, and Converter
2-6
2.3.2 Scheduled maintenance
Clean and check the Inverters, Converters, and Motors in the following way periodically.
1. If air filters are used in the control panel or other devices, clean the filters once a month
at least.
2. If contaminated with dirt or dust, electronic parts may exhibit overheat or decrease in
insulation characteristics. Therefore remove the dirt or dust periodically. Likewise, if the
heat sink is contaminated with dust or oil at the rear surface of the Inverter and
Converter, it becomes unable to dissipate heat effectively, resulting in a damage. Clean
the heat sink with an air blow or a cloth once per 6 months at least. (If it is contaminated
considerably, cleaning shall be made more frequently.)
3. Checking vibration and sound levels by touching and hearing every day to verify that
the levels do not become greater than normal.
4. Checking their appearance, clean them if necessary with an air blow or cloth according
to the degree of contamination.
2.3.3 Megger test on Spindle Motor
Test the insulation of Spindle Motor using a Megger tester (500 VDC) as follows:
1. Isolate the Spindle Motor from the Inverter by disconnecting connections.
2. Measure the resistance between either of the motor power lines U, V, and W phases and
the FG (Frame Ground). [If Spindle Motor uses 6 wires: U (U1), V (V1), W (W1), X
(U2), Y (V2), and Z (W2); measure the resistance between each of the U (U1), V (V1),
and W (W1) and the FG.]
3. The resistance is correct if the Megger tester reading is 10 M
Ω
or higher.
Check object
Check procedure
Criteria Corrective action
Item Method
Around the
bearing Sound from the
bearing Hearing or
auscultation stick Shall be free from abnormal sound
or increase in noise level. Replace the bearing.
Vibration Touching or
vibration meter Shall be free from abnormal
vibration.
Bearing
temperature Touching or
thermometer Shall be free from abnormal
temperature rise.
Grease Viewing Grease leakage shall not exist. Remove any cause.
Motor cooling
fan Operation status Viewing or hearing Shall be operated normally. Remove any cause or replace the
fan if defective.
Table 2.4 Daily maintenance for Spindle Motor, Inverter, and Converter (cont’d)