4.25 Backplane
Figure 4-237 Backplane
4.25.1 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 on-board plug-in modules with communication from 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 on-board, low-voltage DC-
DC converters for conv5V, +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.
4.25.2 Backplane Connections and Test Points
The Backplane connections and test points are indicated in Figure 4-238 Backplane Connections on page 212 and
Figure 4-239 Backplane Test Points on page 213.
M-SV-001-EN Rev. H-1/23/2023 Page 211 of 294
Summary of Contents for Turbocor TT Series
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