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DocumentNo. IS2463-PIssue E19-03-10 Sheet 3of6
DC unitsandthe230VAC,115VAC unitshaveaswitching
voltage regulatorcircuit andthereforetheinputcurrentlevel
will decreaseslightlyastheinputvoltage inincreasedand
will increase slightlyastheinputvoltage isreduced.The12V
unitsdo nothaveavoltage regulatorandthereforetheirinput
current will increase whentheinputvoltage isincreased.
BeaconSection
Theinputcurrenttothebeaconsectionwill varyaccordingto
thevoltage inputlevel. Thecurrentlevelsshownaboveare
fornominalinputvoltage.The12V,24Vand48VDCunits
haveaconvertercircuit andthereforetheinputcurrentlevel
will decreaseslightlyastheinputvoltage inincreasedand
will increase slightlyastheinput voltage isreduced.
9) CableSelection
Whenselectingthecablesizeconsiderationmustbegivento
theinputcurrentthateachunit draws(see tableabove), the
numberofunitsonthelineandthelengthofthecableruns.
Thecablesizeselectedmusthavethenecessarycapacityto
provide theinputcurrenttoall oftheunitsconnectedtothe
line.
SAFETYWARNING: Iftheunit isusedathighambient
temperatures,i.e.over+40ºC,thenthecableentry
temperaturemay exceed +70ºCandthereforesuitableheat
resistingcables mustbeused,witharated service
temperatureofat least 110ºC.
10) Earthing
BothAC andDC unitsmustbeconnectedtoagood quality
earth.Theunitsareprovidedwithinternalandexternal
earthingterminals,whichareboth,locatedonthe beacon
sectionoftheunit (see figures2and3).
Whenusingtheinternalearthterminalensurethatthe
stainless steelM4flatwasherisbetweentheincoming earth
wireandtheenclosure.
Whenusingtheexternalearthterminalacablecrimplug
mustbe used.Thecablelugshouldbe locatedbetweenthe
twoM5stainless steelflatwashers.TheM5stainlesssteel
springwashermustbe fixed betweentheouterflatwasher
andtheM5stainless steelnuttoensurethatthecablelugis
secured against looseningandtwisting.
Theinternalearthbondingwireensuresthatagoodquality
earthismaintained betweenthesoundersectioncastingand
thebeaconsectioncasting.
11) CableGlands
TheBExDCS110-05Dunit hasdual cableglandentries which
haveanM20 x1.5entrythreadasstandard.Onlycable
glands approvedforEx‘d’applicationscan be used,which
mustbe suitableforthetype ofcablebeingusedandalso
meettherequirementsoftheEx‘d’flameproofinstallation
standardEN60079-14:2008/ IEC60079-14:2007.
Whenonlyonecableentryisusedtheotheronemustbe
closedwithanEx‘d’ flameproofblankingplug, whichmust be
suitablyapproved for theinstallationrequirements.
For combustibledustapplications,thecableentrydevice and
blankingelementsshall be intype ofexplosionprotection
increasedsafety"e"orflameproofenclosure"d"andshall
haveanIP6XratingaccordingtoEN60529:1992.
SAFETYWARNING: Iftheunit isusedathighambient
temperatures,i.e.over+40ºC,thenthecableentry
temperaturemay exceed +70ºCandthereforesuitableheat
resistingcableglandsmustbe used,witharated service
temperatureofat least 110ºC.
12) CableConnections
Thecombinedsounderbeaconunit BExDCS110-05Dhas
separateprinted circuit boardsinthesounderandbeacon
sections.Theterminalsforthesounderareontheprinted
circuit boardinthesoundersectionandtheterminalsforthe
beaconareontheprinted circuit boardinthebeaconsection
(seefigures 4&5and6&7). Seesection7ofthismanualfor
accesstotheenclosureandthewiringdiagramsattheendof
thismanual.
Thesounderandbeaconsectionscan be wiredtothesame
inputsupplysothattheyoperatesimultaneouslyortheycan
be wiredtoseparateinputsuppliessotheycan beoperated
independently(seediagramsofpages 5and6ofthis
manual). If thesounderandbeaconsectionsareconnected
tothesameinputsupply,theincomingcablesshouldbe
connected totheinput terminalsonthebeaconboardandthe
twoconnectingwires,thataresuppliedwiththeunit,should
beusedtolink thesupplyfromtheinterconnectingterminals
onthebeaconboarddowntothesupplyterminalsonthe
sounderboard.
SOUNDER SECTIONCONECTIONS
OntheACunitsatwo-way terminalblockisprovidedforthe
liveandneutral mainssupplywires andathree way terminal
blockisprovidedforlinkingthesecond andthirdstages,(see
figure7). OntheDC unitsafourwayterminalblockis
providedfor+veand–vesupplyinputandsecondandthird
stage modesofoperation, (see figure6).
Asinglewirewithacross sectionalareaofupto4mm²can
be connectedtoeachterminalwayorifan inputandoutput
wireisrequired two2.5mm²wires can be connected toeach
terminalway.Whenconnectingwires totheterminalsgreat
careshouldbetakentodress thewireso thatwhenthe
beaconsectionisinserted intothechamberthewires do not
exert excess pressureontheterminalblocks.Thisis
particularlyimportantwhenusingcables withlarge cross
InternalBonding Wire Terminal
CableEntries