Grounding—Dedicateddrainwirerequired
Thisproductincludesadedicateddrainconductor(screen)forconnectiontoavessel'
sRFground
point.
ItisimportantthataneffectiveRFgroundisconnectedtotheunit.Theunitcanbegroundedby
connectingthedrainconductor(screen)tothevessel'sRFgroundpoint.OnvesselswithoutanRF
groundsystemthedrainconductor(screen)shouldbeconnecteddirectlytothenegativebattery
terminal.
Thedcpowersystemshouldbeeither:
•Negativegrounded,withthenegativebatteryterminalconnectedtothevessel'sground;or
•Floating,withneitherbatteryterminalconnectedtothevessel'sground.
Ifseveralitemsrequiregrounding,theymayfirstbeconnectedtoasinglelocalpoint(e.g.withina
switchpanel),withthispointconnectedviaasingle,appropriately-ratedconductor,tothevessel’s
commonRFgroundpoint.
Implementation
Thepreferredminimumrequirementforthepathtogroundisviaaflattinnedcopperbraid,with
a30Arating(1/4inch)orgreater.Ifthisisnotpossible,anequivalentstrandedwireconductor
maybeused,ratedasfollows:
•forrunsof<1m(3ft),use6mm
2
(#10AWG)orgreater.
•forrunsof>1m(3ft),use8mm
2
(#8AWG)orgreater.
Inanygroundingsystem,alwayskeepthelengthofconnectingbraidorwiresasshortaspossible.
References
•ISO10133/13297
•BMEAcodeofpractice
•NMEA0400
Powerdistribution—ACU
Recommendationsandbestpractice.
•TheproductisNOTsuppliedwithapowercable.PleaserefertothePoweranddrivecables
sectionforpowercablerequirements.
•Refertothe
Powerconnection
sectionformoreinformationonhowtoidentifythewiresinyour
product’spowercable,andwheretoconnectthem.
•Seebelowformoreinformationonimplementationforsomecommonpowerdistributionscenarios.
Important:
Whenplanningandwiring,tak eintoconsiderationotherproductsinyoursystem,someofwhich
(e.g.sonarmodules)mayplacelargepowerdemandpeaksonthevessel’selectricalsystem.
Note:
Theinformationprovidedbelowisforguidanceonly ,tohelpprotectyourproduct.Itcovers
commonvesselpowerarrangements,butdoesNOTcovereveryscenario.Ifyouareunsurehow
toprovidethecorrectlevelofprotection,pleaseconsultanauthorizedRaymarinedealerora
suitablyqualifiedprofessionalmarineelectrician.
Implementation—directconnectiontobattery
•Theunitmaybeconnecteddirectlytothevessel' sbattery,viaasuitablyratedfuseorbreaker.
•TheunitalsorequiresaseparateRFGround(drain)connection,refertothefollowingsection:
Grounding—Dedicateddrainwirerequired
.
•YouMUSTfitasuitably-ratedfuseorbreakerbetweentheredwireandthebattery’spositive
terminal.ThisisrequiredinadditiontotheinternalfusefittedtotheACU.
•Refertothetablebelowforsuitablefuseratings.
A CU-200,ACU-300,ACU-400connections
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