Sharp SD-AT1000W Especificações descarregar pdf (Página 169)

Maxiva UAX

October 17, 2013

4‐5

888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.

4.2.3.4 CustomerIOCard

TheTCUcontainsacustomerIOcard,whichprovidesrelayisolatedoutputsandotherremotesignalbuffering /

conditioningfortheparallelremotecontrolinterfacefoundatthetopofthetransmittercabinet.Interconnection

betweenthecustomerinterfaceboardatthetopofthetransmittercabinetandthecustomerIOcardintheTC

Uis

viaapairoffifty‐conductorribboncables.

4.2.3.5 OtherTCUComponents

TheTCUalsocontainsthefollowingcomponents:

• Base‐Plane‐providesacommonbusforthevariousplug‐incards

• PowerSupplyModule–providesDCpowertoallinternalcircuits

• GraphicalUserInterface(GUI)–apanel‐mountminiaturePCfeaturinga1/4VGAtouch

screen.

4.2.4 ControllerAreaNetwork(CAN)Bus

TheControllerAreaNetworkorCANbusisaserialcommunicationslinkusedbetweentheTCUandLPUsforthe

transmissionofcontrol,status,fault,andmeteringinformation.TheCANbusisdesignedforhostileindustrial

environmentsandoperatesindifferentialmodeforhighcommonmodenoiseimmunity.Themasterandsl

aveLPUs

cansend andreceiveinformationovertheCANbus;however,itistheMCMcardintheTCUthatdetermineswhich

informationissentandwhenitissentinthisapplication.

TheMCMca

rdcontainsLEDsthatwillflickeronandoffatarandomrateindicatingthatthereisactivityontheCAN

bus.IftheLEDsareofforalwayson,thentheCANbusismostlikelynotcommunicating.TheLEDpairDS7andDS8

isforthecabinetCANbu

s(Rx&Txrespectively).TheLEDpairDS11andDS12forasystemCANbusnotusedinVAX

transmitters.

Allfa

ultreporting,status,andmeteringinformationdisplayedontheTCUissentontheCANbusfromthe

respectiveLPUstotheMCMcard.TransmittercontrolsignalsfromtheMCMaresentviatheCANbusbutarealso

sentoverparallelcontrollinesfromaTCUinterfacecardviaDB‐25ri

bboncables.

4.2.5 TransmitterRFPowerControl

ThePAmodulesandPAblockshavenointernalgainadjustment.ThetransmitterRFoutputpoweriscontrolledvia

theoutputpowerdriveleveloftheLPUmodulatorsection.

Whenpr

esentindualdrivesystems,theTCUmonitorspowerleveldatafromtheLPUanddisplaysitontheGUIbut

doesnotcontrolit.Automaticlevelcontrol(ALC)isprovidedbyindividualALCcircuitsintheLPUmodulator

section(s).Accordingly,thecurrentlyselectedLPUsetstheoutputpowerofthet

ransmitter.Thenon‐selectedLPU

sitsinreserveandhasnoeffectonthetransmitterpowerlevel.

Themajo

rcomponentsofthetransmitterRFpowercontrolcircuitareillustratedinFigure4‐4.

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 291 292

Sharp SD-AT1000W Especificações Página 169