85 of 132
M-SV-001-EN Rev.E
Compressor Components
3.17.2 Connections
PWM connectors supply power at the bearing
power feed throughs. See Figure 82 (Bearing
Power Feed Throughs).
Figure 82 - Bearing Power
Feed Throughs
3.17.3 Verification
3.17.3.1 Bearing Coil
Verification
• • • CAUTION • • •
Do not attempt to perform an insulation (megger) test on a component under vacuum. This can cause insulation breakdown or
failure during the testing process.
NOTE
To check bearing coil insulation integrity, a Mega ohm meter (megger) set to 1KV should be used. Readings from coils to ground
should be greater than 100MΩ, and readings between coils should be greater than 100MΩ.
NOTE
A faulty PWM Amplifier may be the result of a bearing failure and may cause a failure of the DC/DC Converter resulting in a blown
F1 fuse on the Soft Start. If a bearing coil is found to be faulty, then the PWM, DC/DC Converter, and Soft Start F1 fuse must be
verified as well.
1. Isolate compressor power.
2. Remove the Service Side Cover verifying the
Backplane LEDs have turned off.
3. Remove the Serial Driver, BMCC, and PWM.
4. Set multimeter for resistance checks.
5. Test resistance on bearing power feed through
pins defined in Table 14 (Magnetic Bearing
Coil Resistance Values). See Figure 83 (Rear
Bearing 6-Pin Orientation (TT300 Serial Numbers
<081015110 Only)), Figure 83 (Rear Bearing 6-Pin
Orientation (TT300 Serial Numbers >081015110
and All Other Models)), and Figure 84 (Rear
Bearing 6-Pin Orientation (TT300 Serial Numbers
> 081015110, and All Other Models) for pin
locations.
6. Compare the resistance values to those defined
in Table 14 (Magnetic Bearing Coil Resistance
Values).
7. Test resistance of each pin to ground.
8. Test insulation of each pin to ground and
between coils.
9. If the integrity of the bearing power feed
through is in question, isolate the compressor,
recover the refrigerant, remove the feed through
and repeat the above steps directly at the
internal bearing cluster block.
J1: PWM Connection
Major Revision “E” and Earlier
Major Revision “F” and Later
Rear Radial and Axial Bearing
Power Feed Through
Front Radial Bearing
Power Feed Through
Summary of Contents for Turbocor TT-300
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