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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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.

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

Danfoss TTS350 User Manual

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