Instruction manual

Systemdesignguidelines-continued
LOOP CABLECAPACITANCE
SCREENCONTINUITY
REPEATERCABLESELECTION
POWERSUPPLY
Cablecapacitanceisanimportantconsiderationwhenchoosingloopcable.
Themaximumpermissiblecapacitanceis0.5uF(500nF)betweenloop+andloop-.
Aseachloopiselectricallyisolatedthereforehighlooptoscreencapacitancedoesnotnormallycausea
problemandshouldnotbethelimitingfactorforlooplengths.
Typicalcapacitanceper100m(FP200/FireTuf)
Corediameter coretocore coretoscreen
1.0mm 10nF 17.5nF
1.5mm 12nF 20.5nF
2.5mm 13nF 24.0nF
Itisvital,forcorrectandtroublefreeoperation,thatthescreeniscontinuousalongthefulllooplength.Ensure
thatthescreenconnectioniscontinuedateachloopdevice. Thescreenshouldbeearthedatoneendonly,via
thecontrolpanel,andneveratloopdevices.
Allcablesenteringthecontrolunitshouldbescreenedandferritesleeves,suppliedwiththecontrolunit,must
beused. Allscreensshouldbeterminatedatthecontrolpanelonlytherebyavoidingearthloops.
Seepage9forconnectiondiagram.
NotetherepeaterdatacablescreensmustNOT beconnectedtotheenclosure(earth)andinsteadconnected
totheterminalsmarkedSCRNinsidethecontrolunitandrepeaterunits.
TherepeatercommunicateswiththecontrolpanelusingtheindustrystandardRS485fullduplex.
Thedatacableusedshouldbe2conductor(twisted)124Ohmtwinixial25 AWG(0.16sqmm)withfoilscreen
anddrainwire.E.g.Beldon9271006(BLULT).
Repeaterscanbepoweredlocallytoavoidrunningadditionalpowercablesortheycanbepoweredfromthe
controlunitusingthefusedoutputterminals.Upto8repeaterscanbeconnectedtoeachsystem,howeverif
poweredfromthecontrolpaneltherepeatercurrentconsumptionshouldbeincludedinpowersupplyand
batterycalculations.
Eachrepeatercanoperatefrom18-30Vdcwithaworstcasecurrentconsumptionof350mA.
Seepage10forconnectiondiagram.
Thecontrolunitrequiresanominal24Vdcsupplyandmustalwayshavebatteriesconnected.Normallythe AC
mainsisconnectedtothe ACmainsinputterminalsandthe ACmainsoutputterminalsarewiredtotheexternal
powersupply. ThepowersuppliesDCoutputisconnectedtothesystemsmainDCinputterminals.
AuxiliaryDCinputterminalsareprovidedasanadditionaloption. TheDCinputand Auxiliary(ifused)mustbe
suitablyratedtochargetheinternalbatteries.
AllpowersupplycablesmustbescreenedandferriteringsusedandcablesshouldnotberoutednearEMC
generatingequipment,radiotransmitters,pagingsystemsetc.,Seepage9.
-8-
ED816A AddressableFireandgasdetectionInstallationmanual8-9-08Rev-a