Instruction manual

TheED722andED726loopdrivercanprovide300mA ofcontinuousloopcurrent,drivingupto
126devicesusing ApolloS90,XP95orDiscoveryprotocol.
Eachloopisfullyisolatedelectricallyfromtheinputpowersupply,givingcontinuedoperation
intheeventofearthfaultsonthedcinput,greatlyincreasingimmunitytoelectricalnoiseand
eliminatingfalsealarmsduetocrosstalk.
TheED722andED726aresimilarbuttheED726canalsoacceptupto10EDL addressable
gasdetectioninterfacemodules.Bothmodelsareavailablewithfrontpanels,asusedinthe
ED700A 8LoopControlPanel,orwithoutfrontpanelsforuseintheED816A.Forthefull
failsafefeaturestobeavailableontheED816A theED722/ED726frontpanellampsand
switchesarerelocatedontheED816A I/Omotherboard.
FAIL SAFEOPERATION
Eachmodulewithinthesystem(ED722/6loopmodules,ED816A DisplaymoduleandED816
I/Omodule)communicatewitheachotherusinganindustrystandardI2Cbus.Intheeventof
acommunicationsfailure,orafaultdevelopingonanyofthemodules,creatinga
communicationsfailure,theloopcardscontinuetooperateautonomously.
Theloopmodulesaredirectlyconnectedtothefollowingnormallyenergisedrelaysmounted
ontheIOmodule.
HWFD=normallyopencontactclosingto470ohmsinthealarmcondition.
PRE=Pre-alarm.
IMM=ImmediateFireorGas Alarm.
DEL =Operates2minutesafteranalarmifmuteorresethasnotbeenpressed.
FLT =Fault.
Sounder1isdirectlyconnectedtothealarmrelay.
DISCOVERY CONVENTIONAL MODE(HardwareFireDetectionHWFD)
Nottobeconfusedwithconventionalfirezones,conventionalmode,builtintotheDiscovery
detectorsandElectronicDevicesgasdetectorinterface,providescontinuedalarmdetectionin
theeventoflimitedcircuitfailure.E.g.Microprocessorfailureontheloopmoduleresultingin
paneltodetectorcommunicationsfailure.Conventionalmodebecomesoperational
approximately2minutesafterlooptodetectorcommunicationshasfailed.ElectronicDevices
recommendusingDiscoverydetectorstotakeadvantageofthisfeature.
PUSHBUTTONOPERATION
Ifpressedundernormaloperatingconditionsthethreepushbuttonsoperateaslamptest
buttonsonly.Howeverintheeventofacommunicationserrororfaultonthe Addressable
displaymodule,theloopcardscontinuetooperateautonomouslyandthepushbuttonswill
functionaslabelled.Seepage29fordetails.
Theseshouldbeusedforallsafetycriticaloperationsastheyareoperated
inthefailsafemode.
Section1-Componentoverview.
ED722andED726LoopDriverModule(ED816A Variation)
-4-
ED816A AddressableFireandgasdetectionInstallationmanual8-9-08Rev-a
Backupalarm/indicatorlamps
EVACUATE
MUTE
RESET
POWER
ALARM
PRE-ALM
DELAYED
FAULT
SILENCED
ISOLATED
LOOP 1STATUS
EVACUATE
MUTE
RESET
POWER
ALARM
PRE-ALM
DELAYED
FAULT
SILENCED
ISOLATED
LOOP 2STATUS
LampTestbuttonandbackupReset
button.
(Seebelowforusage)
LampTestbuttonandbackupEvacuate
LampTestbuttonandbackupMute
button.