10. Remove the Bearing Sensor Cables from the front and rear 9-pin feedthroughs.
11. Inspect the Bearing Sensor Cables and associated connections for damage, debris, or corrosion.
12. Clean or replace as necessary.
13. Install the Bearing Sensor Cables to their respective locations.
14. Apply a thin coating of dielectric grease on the exterior of the Bearing Sensor Feedthrough Connectors
where the Bearing Sensor Cables contact the feedthroughs.
NOTE
Do not apply dielectric grease directly to the Bearing Sensor Feedthrough pins.
15. Re-install the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
16. Re-apply power to the compressor.
17. Repeat the calibration and validation procedures, Steps 2 through 6.
18. If the calibration and/or validation results improve, the bearing control loop is functioning normally.
Continue to Step 21.
19. If calibration and/or validation results continue to show an issue, replace the Bearing Sensor Cables,
then verify other components in the bearing control loop as instructed in the Service Manual.
20. Repeat the validation process in Steps 2 through 6 to ensure proper functionality.
21. Return the compressor to normal operation.
4.30.4 Bearing Sensor Cable Removal and Installation
Refer to Figure 4-238 Backplane Connections on page 212 for connector locations in this section.
Bearing Sensor Cable Removal:
1. Isolate compressor power.
2. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
3. Wait for the LEDs on the Backplane to turn off.
4. For the Front Bearing Sensor Cable, refer to Steps 4 and 5; for the Rear Bearing Sensor Cable, refer to
Steps 6 through 8.
5. Remove the cable from J10 on the Backplane by spreading the clips out and away from the cable
connector.
6. Remove the cable from the 9-pin connector at the Front Bearing Sensor Feedthrough by removing the
two (2) retaining screws that secure the connector to the Bearing Sensor Feedthrough.
7. Remove the cable from J9 on the Backplane by spreading the clips out and away from the cable
connector.
8. Remove the cable from the 9-pin connector at the Rear Bearing Sensor Feedthrough by removing the
two (2) retaining screws that secure the connector to the Bearing Sensor Feedthrough.
9. Remove the ground wire from J11 on the Backplane.
NOTE
The ground wire may be installed on either J11 or J12.
10. Pull the cable from the feedthrough.
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Summary of Contents for Turbocor TT Series
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