89 of 132
M-SV-001-EN Rev.E
Compressor Components
3.18.3 Verification
3.18.3.1 Bearing Sensor
Resistance Verification
1. Isolate compressor power and wait for the LEDs
on the Backplane to turn off.
2. Remove the bearing sensor cable from the
bearing sensor feed through. See Figure 78
(Bearing Sensor Feed Throughs).
3. Set multimeter for resistance checks.
4. Place meter leads on bearing sensor feed
through pins outlined in Table 16 (Bearing Sensor
Coil Resistance). See Figure 89 (Bearing Sensor
Pin Locations) for pin locations.
• NOTE: There are no connections on Pins 1 & 4 and
1 & 9 on the rear bearing sensor feed through.
5. Test each pin to ground; reading should be
open or infinite.
6. If the integrity of the bearing sensor feed
through is in question, isolate the compressor,
recover the refrigerant, remove the feed through
and repeat the above steps directly at the internal
sensor connector.
Figure 89 - Bearing Sensor
Pin Locations
Table 16 - Bearing Sensor
Coil Resistance
Pin Combination Front Sensor Rear Sensor
5-2 2.0Ω to 3.5Ω 2.0Ω to 3.5Ω
5-3 2.0Ω to 3.5Ω 2.0Ω to 3.5Ω
6-7 2.0Ω to 3.5Ω 2.0Ω to 3.5Ω
6-8 2.0Ω to 3.5Ω 2.0Ω to 3.5Ω
1-4 2.0Ω to 3.5Ω Open
1-9 2.0Ω to 3.5Ω Open
3.19 Cavity Temperature
Sensor
3.19.1 Function The cavity temperature sensor reads the
temperature of the motor cooling gas within the
shaft cavity as it exits the Stator.
3.19.2 Connections
The cavity temperature sensor is located behind
the Backplane. See Figure 92 (Cavity Temperature
Sensor Removal).
The cavity temperature sensor is connected to
the J23 connector on the Backplane. See Figure
60 (Backplane Connections and Test Points).
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