Specifications

Section-4 Theory

November 11, 2013

4‐26

WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300

Figure 4-15 AC/DC Converter Interface Block Diagram

4.6.3.4 PAMonitorBoard

ThePAMonitorBoardcontrolsandmonitorsthePAmodule’soperation.Allanalogparametersofthepower

amplifieraremonitoredandevaluatedviatheanalogcomparatorstogeneratetheOK/FAULTlogicsignal,andthe

signalissenttoaCPLDdevicetorealizeapre‐definedcontrollogicalgorithm.Thefault

andwarninginformationis

displayedbythered/greenLED’s infrontofthePA,andthefaultsignaliscodedanddeliveredtotheUCPinthe

MaxivaULXtransmitterviaindividualseparatewires.TheoverallcontrollogicisdoneviaaCPLDdeviceandthereis

nomicroprocessoron

boardandthereisnoserialcommunicationdesignedintothePAmonitorboard.

Onlyonefaultcanbedetectedatatime.Iftwoormorefaultconditionsaredetectedsimultaneouslyonlythe

highestpriorityfaultisshownthroughthefrontpanelLEDsSee

Table4‐15onpage4‐27foradescriptionoftheLED

indications.Theprioritytableisdesignedtosegregatefaultthatismostlikelyresponsibleforotherfaultsthatshow

upsimultaneously.The3‐bitcodeassignedtothefaultwithhighe stpriorityissenttotheUCP.Followingtableshows

priorityassignmentandcorresponding3‐bitcodes.

Priority,Code,Description

• 0,000,NoFault

• 1,001,TemperatureFault

• 2,010,VSWRFault

• 3,011,OverdriveFault

• 4,100,PSFailure

• 5,101,MOSFETFault

• 6,110,RFINLowFault

TheMonitorboardcontainsthePAmodulecontrolcircuitry.ItisaCPLDcontrolledcircuit,whichacceptscommands

fromtheTCUandreturnsstatusandmonitoringsignalstotheTCU.WithinthePAmodule,thecommunicationpath

betweenMonitorboard andtheTCUisJ1ontheMonitorboardtoJ1

ontheSignalDistributionboard,J4onthe

SignaldistributionboardtoJ2ontheConnectorI/Oboard,andJ2toJ1ontheConnectorI/Oboard.TheMonitor

boardcommunicateswithalloftheotherboardsinthePAmoduleviaitsconnectorsJ1,J2,andJ4.ConnectorJ3

on

theMonitorboardisatestoutputusedbyengineering.