212 of 282 M-SV-001-EN Rev. G
10. Remove the Backplane Frame from the compressor housing.
4.26.3.2 Backplane Installation
1. Align the Backplane with the mounting holes, ensuring the cavity temperature sensor
connector is available.
2. Insert and torque the fasteners at the top of the Backplane Frame to 3 Nm (27 in.lb.).
3. Insert and torque the Backplane Ground fastener at the bottom right of the Backplane to 3 Nm
(27 in.lb.).
4. Install all connectors to their appropriate locations.
5. Remove the Inverter Ground fastener from top right of the Backplane.
6. Connect the Inverter ground ring to the Inverter Ground Screw and torque the fastener at top
right of the Backplane to 3 Nm (27 in.lb.).
7. Install the Bearing PWM Amplifier, BMCC, and Serial Driver.
8. Install the Service Side Cover. Refer to "4.2.3.1 Service Side Cover Removal and Installation" on
page 58.
9. Return the compressor to normal operation.
4.26.3.3 Backplane Torque Specifications
Table 4-44 Backplane Torque Specifications
4.27 Serial Driver
Figure 4-270 Serial Driver
4.27.1 Serial Driver Function
The Serial Driver is powered with +15VDC and +24VDC from the Backplane.
The Serial Driver provides +24VDC to the Motor-Cooling Solenoids, +15VDC to the IGV stepper motor,
and +15VDC to the external expansion valves on the I/O board.
The Serial Driver also controls the RUN and Alarm LEDs on the Backplane and the STATUS indicator on
the I/O board.
All actions of the Serial Driver occur when signaled from the BMCC.
Description Nm Ft.Lb. In.Lb.
Backplane Mounting/Ground fastener, M5x10 3 - 27
Inverter Ground fastener, M5x25 3 - 27
PWM Mounting/heatsink fastener, M5x10 4.5 - 40
Cover fastener, M5x15 1.5 - 13
Serial Driver
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