222 of 282 M-SV-001-EN Rev. G
Figure 4-282 Removing the PWM Amplifier
7. Remove the bearing PWM amplifier from J1 of the Backplane.
Figure 4-283 PWM Amplifier Installation
1. Check that the M5x10 ground fastener at the lower right of the Backplane is tight before
replacing the PWM. Torque to 3 Nm (27 in.lb).
2. Align the heat sink of the PWM with the two guide pins in the main compressor housing.
3. Insert the PWM into the J1 connector of the Backplane.
4. Secure the heat sink of the PWM to the main compressor housing with three M5x10 fasteners.
Torque to 4.5 Nm (40 in.lb.).
5. Ensure the heat sink of the PWM is firmly seated against the main compressor housing.
6. Connect the two (2) Molex connectors for the PWM and bearing feed throughs.
7. Install the BMCC. Refer to "4.28.4 BMCC Removal and Installation" on page 217.
8. Install the Serial Driver. Refer to "4.27.4 Serial Driver Removal and Installation" on page 213.
9. Install Service Side Cover. Refer to "4.2.3.1 Service Side Cover Removal and Installation" on
page 58.
10. Install the top covers. Refer to "4.2 Compressor Covers" on page 56.
11. Return the compressor to normal operation.
12. Perform a bearing calibration after replacing the PWM to verify functionality. Refer to "5.3
Bearing Calibration" on page 250.
4.29.4.2 PWM Torque Specifications
Table 4-45 PWM Torque Specifications
PWM Mounting/
heatsink Screw,
M5x10
(3 places)
Backplane
Ground Screw,
M5x10
NOTE
Prior to replacing a PWM, verify the bearing coils.
Description Nm Ft.Lb. In.Lb.
Backplane Ground fastener, M5x10 3 - 27
PWM Mounting/heatsink fastener, M5x10 4.5 - 40
Cover fastener, M5x15 1.5 - 13
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