Sharp SD-AT1000W Dokumentacja Pobierz pdf (Strona 46)

Section-2 Installation

October 17, 2013

2‐4

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

Ifusingmetalconduit,installtheACmainswiringinaseparateconduitfromallLPUinputcablesandsmallsignal

lines.

Ifapr

e‐wiredrackisnotordered,matingconnectors(IEC15andIECC20)areprovidedwiththetransmitter

shipmenttoallowterminationofACmainscablesfromtheACmainsdistributionpanel.Iftheseconnectorscan’tbe

locatedpleasecontactHarrisCustomerService.

2.6.1 SurgeSuppressionDevices

HarrisstronglyrecommendstheuseofsurgeprotectiondevicesontheincomingACmainslines.Thesedevices

protectagainstdamagesduetotransientsarisingfrombothnaturalandman‐madesources.(e.g.lightningand

inductiveloadswitching).Clearpreferenceistobegivento"series"typesurgeprotectiondevices‐‐featuring

protectionbybothaserie

sinductance/shuntcapacitorfi lterandshuntthresholddevice‐‐oversimpleshunt‐only

clampingdevices.Thesurgeprotectormustbesizedtohandlethefullamperageofthe loaditisprotecting(plusa

nominalsafetymargin)andbeconnectedtothebuildinggroundsystembyshort,di

rectconnections.Inthecase

wheretheshuntprotectionelementsareprotectedbyafuse,itisnecessarytoperiodicallychecktheintegrityofthe

fusetoensurecontinuedtransientprotection.

Thet

ransmitterandthepowersuppliesmoduleshavebeentestedtospecEN61000‐4,whichguaranteesa

protectionagainst2kVtransients.However,thisprotectionhasitslimits,anditis prudenttoprotectyour

investmentbyinstallingqualitysurgesuppressionequipment.

Caution

.FAILURE TO FOLLOW THESE RECOMMENDATIONS MAY LEAD TO

SHORTENED EQUIPMENT LIFE AND REDUCED RELIABILITY.

2.7 GroundRequirements

TwoseparategroundconnectionsarerequiredfortheUAXtransmitter:anACsafetygroundandanRFearth

ground.

TheACsaf

etygroundpreventsanelectrocutionhazardshouldadangerouspotentialfrominsidetheunit

accidentallycontactthemetalchassis.TheACsafetygroundworksbyprovidingasecure,uninterruptedpathforany

waywardelectricalcurrenttoreturntothesource:thesecondarywindingofthelocalpower‐gridtransformer(o

r

generator).Thisensuresthatanyexposedmetalpartswillnotsimply“float”toavoltageleveldangeroustohumans

inthecaseofanaccidentalcontactwithmainsvoltageandthatasufficientfaultcurrentwillbedrawntotripany

circuitprotectiondevices.

TheACsaf

etygroundconnectionismadeautomaticallyfortheLPUandPABchassisviathegreen/yellowwire(third

prong)oftheACinputcord.

Inthecas

eofaHarris‐suppliedACdistributionchassis,thegreen/yellowphysicalearth(PE)connectionfromthe

incomingACmainsserviceterminatesatthePEterminaloftheACdistributionchassis.Theindividualsubassemblies

makingupthetransmitterconnectviathegreen/yellowwireoftheirmainscordstothesamePEte

rminalontheAC

distributionchassis.Whenpresent,therackbuss‐barwillalsoconnecttothisPEterminal.

TheACsaf

etyground(green/yellow)wirefromthetransmitterrackshouldterminateatasuitablephysicalearth

(PE)or(PEN)connectionattheACmainsentrance/distributionpanel,orasotherwisedictatedbysafetynorms.In

thosesystemswithonlyadirectearthgroundinsteadofawiredPEconnectionbacktothepo

wersource,theuseof

specialground‐faultsensingcircuitprotectiondevicesisindicated.

Ina

dditiontotheequipmentchassis,allmetalenclosuresandconduitpiecespotentiallyexposedtomainsvoltages

inthecaseofafaultshouldhaveasecure,uninterrupted,conductivepathbacktothePEterminalinthemains

entrance.

TheRFea

rthgroundpreventsdamagetotheequipmentduringlightninginducedtransientsbyprovidingalow

impedancepathforlightningtoreturntotheearth.AnRFgroundstrap/wireattachmentpointislocatedattherear

oftheLPUandPABchassis.Thisconnectionissuitableforuseinasinglepoi

ntgroundingsystem,withtheground

strapattachedtotheequipmentrackandthe rack,inturn,toacommongroundingplate.Astrapwithaminimum

widthof5cmshouldbeusedtoconnecttheequipmentracktothe buildingearthgroundsystem.

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