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M-SV-001-EN Rev. G
4.26 Backplane
Figure 4-264 Backplane
4.26.1 Backplane Function
The Backplane is powered by +24VDC (with respect to 0V) from the DC-DC Converter. The DC-DC
Converter also provides the Backplane with HV+ (+250VDC with respect to HV-) for the Bearing
PWM Amplifier. The Backplane connects the onboard plug-in modules with the power electronics,
expansion valves, IGV stepper motor, motor-cooling solenoids, bearing sensors, and pressure/
temperature sensors. It is a means to transfer control, sensor, and error information between the BMCC
and other compressor components.
The Backplane also serves as the source of power to the parts connected to it. It features onboard,
low-voltage DC-DC converters for converting +5V, +15V, -15V, and +17V from its input of +24VDC.
Note that the +5V, +15V, and -15V are with respect to 0VDC, but the +17V is with respect to HV-. The
Backplane is also equipped with status-indicating LEDs. All LEDs are amber in color except for the
alarm LED (D12) which is green or red, depending on alarm status.
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