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. Remove the Serial Driver, BMCC, and PWM.
5. Set multimeter for resistance checks.
6. Test resistance on bearing power feedthrough pins defined in Table 4-45 Magnetic Bearing Coil
Resistance Values. Refer to Figure 4-256 Front and Rear Bearing Feedthrough Connectors for pin
locations.
• • • CAUTION • • •
Use care not to damage the pins when inserting test leads into the connectors.
7. Compare the resistance values to those defined in Table 4-45 Magnetic Bearing Coil Resistance Values.
8. Test insulation of each pin to ground and between coils.
9. If the integrity of the bearing power feedthrough is in question, isolate the compressor, recover the
refrigerant according to industry standards, remove the feedthrough and repeat the above steps
directly at the internal bearing cluster block.
Table 4-45 Magnetic Bearing Coil Resistance Values
Compressor Model & Design Sequence
Connector
Location
Bearing
Identification
Feedthrough
Pin
Identification
TTS300, TTS400, TGS230,
& TGS390
TTS350, TTS450, TTS500, TTS700, TGS310,
TGS380, TGH490, TGS520, TTH375, &
TGH285
Rear Bearing
Connector
Rear Radial Coil
1 & 6
2.70 - 3.25Ω
2.70 - 3.25Ω
2 & 5
2.70 - 3.25Ω
2.70 - 3.25Ω
Axial Coil
3 & 4
5.70 - 6.20Ω (TTS300/TGS230 only)
6.00 - 6.70Ω (TTS400/TGS390 only)
6.00 - 6.70Ω
Front Bearing
Connector
Front Radial Coil
1 & 2
2.70 - 3.25Ω
4.70 - 5.20Ω
3 & 4
2.70 - 3.25Ω
4.70 - 5.20Ω
Notes
Refer to Figure 4-256 Front and Rear
Bearing Feedthrough Connectors for pin
locations
All resistance values are in ohms. Resistance to ground and between coils should be >100MΩ
@1KV
Figure 4-256 Front and Rear Bearing Feedthrough Connectors
M-SV-001-EN Rev. H-1/23/2023 Page 231 of 294
Summary of Contents for Turbocor TT Series
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