Specifications

Maxiva ULX Series
November 11, 2013
4‐17
888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.
Copyright©2013,HarrisBroadcast
4.4.10 ParallelControlLines
Theparallelcontrollinesareusedforquickactuationofcriticalfunctions,suchasON,OFF,RFmute,PSadjust,and
FaultOff.TheselinesarealsothebackupcontrollinesinlifesupportmodewhenthePCM(andtherefor ethesystem
CANbus)isnotoperational.TheMCMcardin
eachcabinetcanindepen dentlyactivatesomeoralloftheparallel
controllinestomaintainoperationandprotectthetransmitterincaseofafaultorotherconditionthatmay
adverselyaffectthetransmitter.TheseparallelcontrolsignalsareduplicatedintheCANmessages .Thefollowingisa
briefexplanation
ofeachoftheparallelcontrollinesincludedinthesystemcontrolbus.
a. SYS_ON_CMD
Thiscommandcorrespondstothetransmitteroperatorpushingthe"ON"button,ThissignalishighforON
andproducedbytheMCMcardintheTCU.
b. /SYS_OFF_CMD
Thiscommandcorrespondstothetransmitteroperatorpushingthe"OFF"button.ThesignalislowforOFF
andproducedbytheMCMcardintheTCU.
c. /SYS_RESTRIKE
WhenthetransmitterisalreadyturnedONandtheoperatorpressesthe"ON"button,thislinewillbe
pulsedlowforaminimumof100ms.Thiswillcauseallcontrollerboardstoresetanyfaultsandstatusand
trytoreturntonormaloperation.Thislineisasenseonlyline
fortherestofthecontrolboards.
ThiscommandisbasicallyaRESETpulsewhichwilltrytoturnonanytransmittercomponentswhichhave
faultedoffduetoa criticalfaultcondition.If theyarestillfaulty,thiswillbedetectedandthecomponent
willsimplybeshutoffagain.Thiswillnotresetorclearthe
FaultLog.
d. /SYS_FLT_OFF
ThiscommandisinitiatedwheneverafaultoccursthatrequiresallRFtobeshutoffandtheamplifiersto
bedisabled.Thisisalatchingtypesignalthatrequiresuserinputtoclearthefaultandturnthetransmitter
backon.Thissignalisactivelow.Thesignal isgenerated
bytheMCMinthemaincabinetTCU.
e. /SYS_RF_MU TE
The/SYS_RF_MUTElineshutsdownallRFoutputtemporari lyuntilthefaultconditioniscleared.Thisisa
non‐latchingsignal.Non‐latchingmeansthatifthefaultclearsthetransmitterwillresumepreviousRFout
‐
put.
f. SYS_PS_ADJUST
TheSYS_PS_ADJUSTlinechangestheoutputofthePAmodulepowersuppliesdependingonmodulation
mode.
g. /SYS_FAULT
h. SYS_ALC
AutomaticLevelControl.TheALCsignalisusedtocontrolthecabinetpoweroutputandisnormallysent
digitallyovertheCANbus.ThislinecarriesananalogvoltagefromtheMCMtothepredrivermodules.The
analogsignalisanalternateversionofthedigitalALCsignalsentover
theCANbus.Itisabackupsignalonly
usedifthePCMcardinmaincabinet(cabinetoneinmulticabinetsystems)fails.IfthePCUandit’sassoci
‐
atedCANbusisoperational,thissignalisnotused.
Table4‐12PAModulePowerSupplyOutputVoltageControl
PA_Voltage_SelectVoltage PowerSupplyOutputVoltage
5.755Vdc 44Vdc
4.122Vdc 46Vdc
2.490Vdc 48Vdc
0.875Vdc 50Vdc