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DocumentNo. IS2491-PIssue C18-03-10 Sheet3of 4(3)
Whenusingtheinternalearthterminalensurethatthe
stainless steelM4flatwasherisbetweentheincoming earth
wireandtheenclosure.
Whenusingtheexternalearthterminalacablecrimplug
must be used. Thecablelugshouldbelocatedbetweenthe
twoM5stainless steelflat washers. TheM5stainless steel
springwashermust be fixed betweentheouterflat washer
andtheM5stainless steelnut toensurethat thecablelugis
secured against looseningandtwisting.
Theinternalearthbondingwireensuresthatagoodquality
earthismaintained betweentheflameproof chambercasting
andtheflameproofcovercasting.
12) CableGlands
TheBExH120DHootronicsounderhasdualcablegland
entrieswhichhavean M20 x1.5entrythreadasstandard.
OnlycableglandsapprovedforEx‘d’applicationscan be
used,whichmustbesuitableforthetypeofcablebeing used
andalsomeettherequirementsoftheEx‘d’flameproof
installationstandardEN60079-14:2008 / IEC60079-14:2007.
SAFETYWARNING: Ifthe BExH120Dsounderisusedat
highambienttemperatures,i.e.over+40ºC,thenthecable
entrytemperaturemayexceed+70ºCandthereforesuitable
heat resistingcableglandsmust beused, witharated service
temperatureofat least 110ºC.
IfahighIP(IngressProtection)ratingisrequired thena
suitablesealingwashermust be fitted underthecablegland.
Whenonlyonecableentryisusedtheotheronemustbe
closedwithanEx‘d’flameproofblankingplug, whichmust be
suitablyapproved fortheinstallationrequirements.
13) CableConnections
Thecableconnectionsaremade intotheterminalblockson
theelectronicpcbassemblylocatedintheflameproof
enclosure.Seesection8ofthismanualforaccesstothe
flameproofenclosure.OntheACunitsatwo-wayterminal
blockisprovidedfortheliveandneutralmainssupplywires
andafourwayterminalblockisprovidedforlinkingtheStop
andthesecondandthirdstages,(see figure5).OntheDC
unitsafivewayterminalblockisprovidedfor+veand–ve
supplyinputandsecondandthirdstage andtheStop modes
ofoperation, (see figure4).
+-23Stop
1 2 3
S2 S3 Stop
+ve
-ve
Asinglewirewithacross sectionalareaofupto4mm²can
be connectedtoeachterminalwayorifan inputandoutput
wireisrequired two2.5mm²wirescan be connected toeach
terminalway.Whenconnectingwirestotheterminalsgreat
careshouldbetakentodress thewiresothat whenthecover
isinsertedintothechamberthewiresdonotexertexcess
pressureontheterminalblocks.Thisisparticularlyimportant
whenusingcableswithlarge crosssectionalareassuchas
2.5mm²andabove.
NL -23Stop
123
14) SoundSelection
TheBExH120DHootronicsounderhas5differenttraditional
soundsthatcan be selectedforthefirststagealarm.The
sounderscan thenbe switched tosoundsecond andthird
stage alarmsounds.The soundsareselectedbypinheaders
onthepcbforbothDCandACunits.The soundtableon
page fourshowsthepinheaderpositionsforthe5sounds
andwhichsoundsareavailableforthesecondand third
stages.
TheBExH120DHootronicsounderhasthefacilitytoreplicate
the“tail off”traditionallyassociated withthesesoundswhen
generatedbyelectro-mechanicaldevices.Theswitchingis
achieved usingthe“Stop”terminal(see section15).
15) Stop and2nd &3rdStageAlarmSoundSelection
Theoperationofthesecondandthirdstagesisdifferentfor
DC andACunits.
DC UnitsSecondandThirdStage SoundSelection
TheBExH120DHootronicDC sounderhasthefacilitytouse
either+veor–veswitchingtochange thesoundtothe
secondandthirdstages.For–veswitchingconnectthetwo
headersonthepcbtotheleft-hand(marked –ve)andcentre
pins.For+veswitchingconnecttheheaderstotherighthand
(marked +ve)andthecentrepins.Tochange tothesecond
stage sound,connecteithera-veor+vesupplylineto
terminalS2,depending onwhichswitchingmodeisbeing
used whilemaintainingthedcsupplytothe+veand–ve
terminals. Similarlyforthethirdstage sound, connect a-veor
+vesupplylinetoterminalS3.ThesupplytotheS3terminal
will automaticallyoverride asupplytotheS2terminal.