Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 242)

Section-5 Maintenance

October 17, 2013

5‐62

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

IsolationresistorsinthePAsplitterandcombinerassembliesabsorbanyreflectedpowerresultingfromimbalances

duetomodulesbeingremovedfromservice.

Thenumberandloc

ationofPAmoduleswillvarydependingontransmittermodel.See"Figure2‐9PSandPA

ModuleLoc

ations"onpage2‐14forlocationsandnumberingofPAandPSmodels.PABPAandPSmodulescanbe

removed(orin

stalled)whilethetransmitterisoperating,butthefollowingstepsshouldbefollowed:

STEP 1

Prepareaclearpathtoalocationtoplacethemoduleonceithasbeen

removed.

STEP 2 LoosenthefastenersandopenthefrontdooronthePAB.

Caution

THE PA MODULES MAY BE HOT. USE PROTECTIVE GLOVES TO PROTECT

YOUR HANDS.

Note

PA modules in the PABs are installed in two orientations. The upper modules are installed with the cooling

fins up. The lower PAB modules are installed with the cooling fins down.

STEP 3 Grasptheleftandrightoutsidesedgesofthealuminummodulehandleand

slowlypullthemoduleoutoftherackusingmoderate,controlledpressure.

Gentlymovingthemodulefromsidetosidewhilepullingthemoduleout

mayaidinremoval.

Caution

DO NOT LET THE MODULE SWING DOWN WHEN PULLING THE MODULE

OUT OF THE RACK. THIS COULD CAUSE DAMAGE TO THE CONNECTORS

ON THE BACK OF THE MODULE.

Whenamoduleisremovedwhilethetransmitterisrunning ,twofaultswillbegenerated.Thefirstistheinterlock

whichturnsoffthepowersupplyassociatedwiththePA.Thesecondisa“BiasFault”whichtheLPUisgeneratingif

thePAcurrentsarebelowthenominalbiascurrentlev

el.Thebiasfaultisarestrikeablefault.Sincethebiasfaultwill

consistentlybetherewhenthemoduleis removed,thecontrolsystemalwaystriestorestrikethesystem.

Ifyoure

insertthemodulewithinthetimetheLPUistryingtorestrikeit(under3seconds),themodulecould

restrike.Ifthemoduleisremovedandnotre‐insertedwithintherestriketimeframe,thecontrolsystemwi ll

considertherestrikeattemptfailed.Onceamodulehasfailedarest

rikeattempt,nofaultsfromthatmodulewill

causethesystemtorestrikeuntilthesystemisresetbypressingtheONbutton.

"Figure5‐47Mod

uleRemovalandRestrikeProcess"onpage5‐63showsthetiminginvolvedinthemoduleremoval

restirkepr

ocess.

1 2 ... 237 238 239 240 241 242 243 244 245 246 247 ... 291 292

Sharp SD-AT1000W Especificaciones Pagina 242