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Robbe Futaba FX-32 Manual

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clockwise.
Variousoutputdevicesareavailableforrobbeservos,someof
themshownintheillustrationabove.Thepicturealsoillustrates
theamountofadjustmentpersplinesegment.
14.7 LINKAGE INSTALLATION
Thefundamentalruleisthatallmechanicallinkagesshouldbe
installedinsuchawaythattheymoveasfreelyaspossible.If
youneglectthis,theservosdrawahighcurrent,whichreduces
safeoperatingtimesmarkedly.Atthesametimethecentring
accuracyofthewholelinkageisdiminished,andthisinturnhas
anadverseeffectonprecisionofcontrol.
4
5
6
1 Nut
2 Washer
3 Rubber grom-
met
4Metalspacer
5Aluminiumplate
6 Screw
1 Woodscrew
2 Washer
3 Rubber grom-
met
4Metalspacer
5 Wood
1
2
3
1
2
3
4
5
InRCmodelcarstheservosareinstalledinfactory-cutapertu-
resinthemountingplate.Modelboatscanbettedwithrobbe
quick-releaseservomounts.Pleaseinstallservoswithcare,as
theyaresusceptibletovibration.
14.6 SERVO TRAVELS / SERVO OUTPUT DEVICES
Splinedservooutputdevicescanbeusedtone-tunetheservo
neutralpositionbymechanicalmeans.
Adjustingtheneutralposition:
Removetheretainingscrewfromtheoutputlever,removethe
lever,moveittothecorrectneutralposition,thenreplaceitand
re-tighten the retaining screw.
Effect:
Toadjustthepositionbythesmallestpossibleamount(3.6°)in
theCLOCKWISEdirection:ARM2mustbesettothenextpos-
siblepositiononbaselineA,ARM3isthensetat7.2°,ARM4
at 10.8°. To obtain the smallest possible adjustment ANTI-
CLOCKWISE,ARM4mustbesettothenextpossibleposition
onbaselineA.
Splinedivisions:
Thesplinedservooutputshaftandsplinedoutputdevicefea-
ture25individualsplines(segments).Thepositionalchangeper
splineistherefore360°/25=14.4°.Theminimumadjustment
availableisdeterminedbythenumberofARMSoftheoutput
device:afour-armeddeviceoffersaminimumadjustmentof
360°/(25x4)=3.6°.Forasix-armeddevicetheminimum
adjustmentis2.4°.ARM2offsetstheneutralby2.4°clockwise,
ARM3by4.8°clockwise,ARM6by2.4°anti-clockwise,ARM
5by4.8°anti-clockwise,ARM4by7.2°clockwiseandanti-
Retaining
screw
Pushrod
15. THE SYSTEM IN OPERATION
All robbe-Futaba receivers continue to operate at a supply
voltageof3Vwhilstmaintainingfullrange.Thismeansthatthe
receivingsystemwillnormallycontinuetooperateevenifone
batterycellshouldfail(short-circuit),sincerobbe-Futabaser-
voscontinuetofunctionat3.6V-justalittleslowerandwith
lesspower.ThisisimportantinWinter,whentemporarydipsin
voltagecouldotherwisecauselossofcontrol.
The disadvantage of this feature is that, under certain circum-
stances, failure of the battery cell may not be noticed. You
shouldthereforecheckthereceiverbatteryfromtimetotime.
We recommend the use of the robbe battery monitor No. 8409
which displays the actual voltage of the receiver battery by
means of a row of LEDs.
15.1 POWER-ON SEQUENCE
Alwaysswitchonthetransmitterrst,followedbythereceiver.
Reverse the order when switching off. The servos run to their
neutralpositionsafterthereceiverhasbeenswitchedon.Itis
advisabletocheckeachfunctioninturnbyoperatingthetrans-
mittercontrols.Checkthecorrectdirectionofmovement/sense
ofthecontrolfunctionsatthesametime.Theservodirection
must be reversed if a servo rotates in the wrong direction.
15.2 ELECTRONIC IGNITION SYSTEMS
Ignitionsystemsforglowandpetrolenginesalsogenerateinter-
ferencewhichcanhaveanadverseeffectonanyradiocontrol
system.Electricalignitionsystemsmustalwaysbepoweredby
aseparatebattery.Usesuppressedsparkplugsandplugcaps
exclusively,aswellasshieldedignitionleads.Installtherecei-
vingsystemcomponentswellawayfromanyignitionsystem.
15.3 RECEIVER BATTERY CAPACITY / OPERATING TIME
This rule is valid for all power sources: capacity is greatly
reduced at low temperatures, resulting in considerably
shorter operating times.
Theoperatingtimevariesgreatlyaccordingtothenumberof
servos connected to the system, the stiffness of the mechani-
callinkagesandthefrequencyofcontrolmovements.Standard
servosdrawacurrentintherange150mAto600mAwhenthe
motorisrunning,andanidlecurrentofaround8mAwiththe
motorstopped.Super-servosandpowerfuldigitalservosdraw
peakcurrentsofupto1300mAatfullload.
Select a receiver battery with ample capacity, taking into
account the number of servos and the total current drain.
Tipsandnotes
… 90 …


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