Raymarine P70 - Adjusting the Hard-Over Time; Compass Linearization

7.8Adjustingthehard-overtime
Onvesselswithoutarudderreferencetransducer,itisimportant
tosetaHardOverTime.
Beforeattemptingtofollowthisprocedureensureyouhave
readandunderstoodtheRudderCheckwarningprovidedin
thisdocument.
Toestimateyourhardovertimefollowthestepsbelow:
1.OnSmartPilotandSPXsystems,adjustyourRudderGain
settingtothemaximumvalue,makinganoteoftheoriginal
value.TheRudderGainsettingcanbeaccessedfromthe
DriveSettingmenu:Menu>Set-up>AutopilotCalibration
>DriveSettings>RudderGain.
2.WiththeautopilotinStandby,manuallyturntherudder/
enginefulltoport.(Forvesselswithpowersteeringthe
engineshouldberunningwhenturningtherudder.)
3.EngageAutomode.
4.Pressthe+10and+1buttonsatthesametime(p70)or
usetheRotary(p70R)toalteryourlockedheadingby90
degrees,useastopwatchtotimethemovementofthe
rudder/engine.
5.Estimatehowlongitwouldtaketomovetherudderfromfull
porttofullstarboard.ThisestimateisyourHardOverTime.
6.EnterthisestimateasyourHardOverTime.TheHardOver
timesettingcanbeaccessedfromtheDriveSettingsmenu:
Menu>Set-up>AutopilotCalibration>DriveSettings>
HardOverTime.
7.OnSmartPilotandSPXsystemschangeyourRudderGain
backtoitsoriginalvalue.
8.AftersettingyourHardOverTime,observeyourautopilot’s
behaviorandifrequired,makesmalladjustmentstotheHard
OverTimevalueuntilasatisfactoryresultitachieved.
Warning:Ruddercheck
IfnorudderreferencehasbeenttedyouMUST
ensurethatadequateprovisionismadetoprevent
thesteeringmechanismfromimpactingtheend
stops.
7.9Compasslinearization
WithEvolutionautopilotsystems,whentheEVunitisrst
installedandpowered-up,itsinternalcompassneedsto
compensateforlocalmagneticvariationsandtheearth’s
magneticeld.Thisisachievedusinganautomaticprocess
knownaslinearization,whichformsanimportantpartofthe
autopilotinstallation,commissioningandset-upprocess.
Linearization
InEvolutionsystems,thelinearizationprocessisperformed
automaticallybytheEVunitasabackgroundtaskwhenthe
vessel'sspeedisbetween3and15knots,nouserintervention
isrequiredhoweveratleasta270degreeturnisrequired.The
processwilloccurduringyourrstvoyagewiththeautopilot
system,andwilltypicallytakenomorethan30minutes,but
thisdoesvaryaccordingtothecharacteristicsofthevessel,
theinstallationenvironmentoftheEVunit,andthelevelsof
magneticinterferenceatthetimeofconductingtheprocess.
Sourcesofsignicantmagneticinterferencemayincreasethe
timerequiredtocompletethelinearizationprocess.Examples
ofsuchsourcesinclude:
•Marinepontoons.
•Metal-hulledvessels.
•Underseacables.
Note:Y oucanspeed-upthelinearizationprocessby
completinga360degreeturn(ataspeedof3–15knots).
Youcanalsorestartthelinearizationprocessatanytimeby
selectingtheRestartCompassmenuitem.
Usethecompassdeviationindicator
Theuseofthecompassdeviationindicatoronthepilotcontrol
headmaybeusefulinthisprocess,particularlyiftheEVunithas
beeninstalledinalocationonthevesselwherethelevelsof
magneticinterferencearetoohighfortheEVunittocompensate
appropriately.Ifthisisthecase,thedeviationdisplaywillindicate
avalueof25degreesorhigher.Inthisscenario,Raymarine
highlyrecommendsthattheEVunitismovedandre-installedin
alocationwhichissubjecttolessmagneticinterference.If“--”
isdisplayedastheDeviationvalue,itmeansthatlinearization
hasnotbeensuccessfullycompletedyet.
Checkthecompassheadingdata
Aspartoftheautopilotsystemcommissioningprocess,
Raymarinerecommendsthatyoucheckthecompassheading
valuedisplayedonyourautopilotcontrolheadormultifunction
display,againstagoodknownheadingsourceonvarious
headings.ThiswillhelpyoutodeterminewhentheEVunithas
completeditslinearizationprocess.
Note:Oncethelinearizationprocesshascompleted,itis
possiblethattheheadingvaluemayhaveaslightoffsetof2to
3degrees.Thisiscommonwhereinstallationspaceislimited,
andtheEVunitcannotbeproperlyalignedtothevessel's
longitudinalaxis.Inthiscase,itispossibletomanuallyadjust
thecompassoffsetvalueusingthepilotcontrolheador
multifunctiondisplay,andne-tunetheheadingtoanaccurate
value.
Note:DoNOTrelyontheheadingaccuracyuntilyouare
satisedthatcompasslinearizationandalignmentiscomplete.
Systemmonitoringandadaptation
Toensureoptimumperformance,aftertheinitiallinearization
processiscompletetheEVcontinuestomonitorandadaptthe
compasslinearizationtosuitcurrentconditions.
Iftheconditionsforlinearizationarelessthanideal,the
automaticlinearizationprocesstemporarilypausesuntil
conditionsimproveagain.Thefollowingconditionscancause
thelinearizationprocesstotemporarilypause:
•Boatspeedislessthan3knots.
•Boatspeedisgreaterthan15knots.
•Rate-of-turnistooslow.
•Signicantexternalmagneticinterferenceispresent.
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p70/p70R