Instruction manual

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Section10-DualRedundancy
DiscoveryConventionalModeandtheHardwareFireDetectionCircuit(HWFD)
LooppoweredSounders,BeaconsorOutputmoduleattachedtothefaultyloopWILL NOToperate.
AlladdressableloopdevicescommunicatewiththeLoopcards,ED722andED726,usingthe ApolloS90,XP95
orDiscoveryprotocol.Ifthiscommunicationfails(duetomicroprocessorfailureetc.)mostpanelswouldhavea
totallossof Alarmdetection,averydangeroussituation. TheED700A andED816A haveDualRedundancy,a
secondarymethodofFireandGasDetection,builtintoeachED722andED726modulewhenusedwith
DiscoverydetectorsandEDL’sGasDetectorInterfaceUnits.Intheeventofcommunicationsfailure,between
thedetectorsandthecontrolpanel,thedetectorscanstillrespondtoaFireorGasalarmbutcannotgivethe
locationdetails.
Forcommunicationstohavefailedsomehardware/softwarefailuremusthaveoccurred.Itislikelymanyfault
messageswillbedisplayeddependinguponwhathasfailedandan .
Itisimpossibletosayhowmuchofthesystemwillstillfunctionwithoutknowingtheexactproblem. The
minimumbeingthattheSounder1circuitandthealarmrelaysoperate.IftheED722/ED726Loopcard
microprocessorisstillfunctioningcorrectlythefollowingwilloccurintheeventofaFireorGas Alarm:
thealarmlamps,buzzersandrelayswilloperateandthefollowingscreenwillbedisplayed:
If
internalsystemcommunicationsarefunctioningtheEVACcommandwillalsobegiven,operatingtheImmediate
Fire/Gasalarmrelay,thepre-alarmrelayandSounders2and3. Allsoundersconnectedtofullyfunctional
loopswillalsooperate.
Pressing“MUTE”willsilenceallsounders.Removingthedetectorinalarmandpressingthe“RESET”buttons
onboththeED816A I/O(seepage29)andED816A Displaywillresetthesystem.Ifthedetectorinalarm
cannotberemovedensureitisclearofsmoke,heatetc.andthentheED816A shouldbeturnedoffforafew
secondsandthenturnedon.
IfSounder1doesnotsilenceandtheImmediatealarmrelay,delayedalarmrelay,pre-alarmrelayandthefault
relaysdonotreturntothenormalstatethisindicateseitherloopcardremoval,loopcardmicroprocessorfailure
orI/Omodulefailure.
Engineershouldbecalledimmediately
10:51 05/06/08 ELECTRONICDEVICES
NOOFDETECTORSIN ALARM:1IN0ZONES
10:5005/06/08CONVMODE ALARM
FIREONLOOP 1
PRE ALARMS0FAULTS0ISOL ZONES0
ED816A AddressableFireandgasdetectionInstallationmanual8-9-08Rev-a