Installation Instructions

Warning:Positiveground
systems
Donotconnectthisunittoasystemwhich
haspositivegrounding.
Fusesandcircuitprotection
Thereare3levelsofpowerprotectionintheautopilot
system.Thedrive(motor)andassociatedcables
areinitiallyprotectedbythecurrentsensingandstall
conditiondetectionwithintheACUhardwareand
software.Asecondlevelofprotectionisprovided
tothesepartsandtheACUcomponentsbythe
unit'smainpowerfuse.Protectionfortheentire
autopilotsystemanditswiringbacktothemain
powerdistributionpanelisprovidedbyyourvessel’s
circuitbreaker/fuse.
Powersupplycircuitprotection
ProtectthepowersupplyfortheEvolutionsystemat
thedistributionboardwithafuseorcircuitbreaker
thatissuitablefortheACU.Forguidance,referto
mainpowerfuseratingstatedontheACUconnector
panel.Ifindoubt,consultyourlocaldealer.
Internalfuses
TheACUusesstandardautomotivebladefuses.
Sparefusesarelocatedontheundersideofthe
removablecover.
Note:
Forclarity,onlythepowerandfuse-related
connectionsareshownintheillustrationabove.
1.Powerfuse(accessibleviatheremovablecover)
2.SeaT alkng®fuse(fusepowersupplyfromACU
toSeaT alkng®backbone)
3.Powerfuse(labelledwithtotalpowerconsumed
bysystem)
Fuseratings
SeaTalkng®
3A
ACU-100
10A
ACU-150
15A
ACU-200
20A
ACU-300
15A
ACU-400
40A
Grounding—Dedicateddrainwire
required
Thisproductincludesadedicateddrainconductor
(screen)forconnectiontoavessel'sRFground
point.
ItisimportantthataneffectiveRFgroundis
connectedtotheunit.Theunitcanbegrounded
byconnectingthedrainconductor(screen)tothe
vessel'sRFgroundpoint.Onvesselswithoutan
RFgroundsystemthedrainconductor(screen)
shouldbeconnecteddirectlytothenegativebattery
terminal.
Thedcpowersystemshouldbeeither:
•Negativegrounded,withthenegativebattery
terminalconnectedtothevessel'sground;or
•Floating,withneitherbatteryterminalconnected
tothevessel'sground.
Ifseveralitemsrequiregrounding,theymayrst
beconnectedtoasinglelocalpoint(e.g.within
aswitchpanel),withthispointconnectedviaa
single,appropriately-ratedconductor,tothevessel’s
commonRFgroundpoint.
Implementation
Thepreferredminimumrequirementforthepathto
groundisviaaattinnedcopperbraid,witha30A
rating(1/4inch)orgreater.Ifthisisnotpossible,an
equivalentstrandedwireconductormaybeused,
ratedasfollows:
•forrunsof<1m(3ft),use6mm
2
(#10AWG)or
greater.
•forrunsof>1m(3ft),use8mm
2
(#8AWG)or
greater.
Inanygroundingsystem,alwayskeepthelengthof
connectingbraidorwiresasshortaspossible.
References
•ISO10133/13297
•BMEAcodeofpractice
•NMEA0400
Powerdistribution—ACU
Recommendationsandbestpractice.
•TheproductisNOTsuppliedwithapowercable.
PleaserefertothePoweranddrivecables
sectionforpowercablerequirements.
•RefertothePowerconnectionsectionformore
informationonhowtoidentifythewiresinyour
product’spowercable,andwheretoconnectthem.
•Seebelowformoreinformationonimplementation
forsomecommonpowerdistributionscenarios.
Cablesandconnections35