Specifications

Maxiva ULX Series
November 11, 2013
1‐11
888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.
Copyright©2013,HarrisBroadcast
TransmitterswithmorethaneightPAmodulesusetwoMOV(metaloxidevaristor)boards.OneMOVboardisused
iftherearelessthaneightPAmodules.TwotypesofMOVboardsareuseddependingonACmainsvoltage.Harris
BroadcastMOVboardpartnumber971‐0040‐009isusedfor
208‐240VACapplications.971‐0040‐01isusedfor380‐
415VWYEsystems.Thetwoboardshavedifferentjumperconfigurations.
The208to240VACissuppliedtoeachPAmodule’sconnectorI/Oboard,toACdistributionboard,andtoeightAC/
DCconverters(twoperpallet).Dependingontheoperatingfrequency,theAC/DCconverteroutputcanbeswitched
between44,46,48,or50VDC,whichisappliedtotheeight
FETs(fieldeffecttransistors)inthePAmodule.There
aretwoFETsoneachofthefourpalletsineachmodule.
Thecontrolsysteminthetransmitterispoweredbytwolowvoltagepowersupply(LVPS)modulesintheTCU.
1.2.9 CoolingSystem
TheULXtransmitterusesa50/50gl ycol/water,closedloop,coolingsystemtomovethemajorityoftheheataway
fromthetransmitterbutalsohascabinetflushingfanstoremoveresidualcabinetheat.Asimplifiedblockdiagram
oftheliquidcoolingsystemisshownin
Figure1‐11.Asimplifieddiagramofthecabinetliquidcoolingsystemis
showninFigure1‐16onpage1‐15.Thecoolingsystemincludes :
a. Coolingsystemcontrolpanel/pumpmodule(s)
b. Heatexchanger(s)
c. SystemAirpurgerlocatedatthehighestpointinthecoolingsystem.
d. Coolantstrainerlocatedinthepumpmodule.
e. Supplyandreturnlinehose,valvesandfittings.
f. PCI(pumpcontrolinterface)locatedintheTCU
g. TransmitterPAmodule,splitterandcombinercoldplates
Thecoolingsystemcomponentscombinetoproduceanefficientclosedloop,pressurizedsystem.Priortooperation
thecoolingsystemmustbeproperlypreparedforoperationandbledtoremovetrappedair.Instructionsforcooling
systempreparationcanbefoundin
Section2.7onpage2‐4ofthismanualandintheHEPumpModulemanual888‐
2625‐001.
Theheatexchangerandpumpmoduleoperateoneither208‐240VAC,50/60Hzor380‐415VAC50/60Hz.The
operatingvoltagesandfrequenciesmustbeprovidedattimeoforder.
Figure 1-11 Simplified Liquid Cooling System Block Diagram
Caution
SOME MAXIVA ULX SERIES SYSTEMS WILL NOT SUPPORT A WATER COOLED
TEST LOAD. IN THOSE CASES AN AIR COOLED LOAD SHOULD BE USED.