Bedienungsanleitung Robbe Futaba FX-40 (Seite 102 von 105) (Englisch)

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Position the output device in the appropriate neutral position,

push it down onto the splined output shaft, and tighten the

retaining screw. The diagram below shows a servo with push-

rod connected.

20.13 INSTALLING LINKAGES

The basic rule when installing mechanical linkages and control

surfaces is that they must be extremely free-moving, other-

wise the servos will draw excessive curr

ents, and the ef

fective

operating time per battery charge will be greatly reduced. At

the same time the centring accuracy of the control system will

be worse, which in turn has a negative influence on the mode-

l’s flying characteristics.

21. THE SYSTEM IN USE

All robbe-Futaba receivers continue to work with full range at

educed voltage, down to the point wher

e the supply voltage

falls to 3 V. The advantage of this is that the receiving system

will normally continue to work even if one cell fails completely

(short-circuit), since robbe-Futaba servos still work down to

3.6V, albeit at slightly lower speed and with reduced power.

This is very important in Winter, when ambient temperatures

are very low, otherwise any momentary voltage collapse could

cause the loss of a model.

However, there is a drawback: under certain circumstances

the user may not even notice the failure of a battery cell. For

this reason it is important to check the receiver battery from

time to time.

We especially recommend the use of a robbe battery monitor,

No. 8409, which indicates the condition of the battery by

means of a row of LEDs.

21.1 POWER-ON SEQUENCE

Always switch the transmitter on first, and only then the recei-

ver. Reverse the sequence when switching of

f. When you

switch the receiver on, the servos run to the neutral position.

If you are using a PCM system it is permissible to switch the

receiver on first, and then the transmitter. This offers the

advantage that the fail-safe data for all channels is automati-

cally transferred to the receiver. If you switch the receiver on

later, it may occur that one channel was already transmitted

before the receiver was ready to receive it. However, this is

only significant if the period between switching off and take-off

is less than sixty seconds, as all data is transmitted again

every minute.

We recommend that you check each function in turn by opera-

ting the associated stick or other transmitter control. Check

that each control surface operates in the correct “sense”

(direction) relative to the stick movement. If any control surface

moves in the wrong direction, that servo must be reversed at

the transmitter.

21.2 “ELECTRICAL NOISE” INTERFERENCE

If your radio control system is to operate safely and r

eliably

, it

is essential to avoid what is known as electrical “noise” interfe-

rence. This problem is due to metal parts, such as pushrods,

the exhaust and the motor crankcase, defective ballraces etc.

rubbing against each other intermittently as a result of vibra-

tion. For this reason the linkage to the engine’s carburettor

must always terminate in a plastic clevis - never connect a

metal linkage directly to the carburettor arm without insulation.

21.3 RECEIVER BATTERY CAPACITY AND OPERATING

TIMES

This rule applies to all types of battery: at low temperatures

battery capacity is sever

ely r

educed, i.e. safe operating times

are shorter in cold weather. The safe operating time varies gre-

atly according to the number of servos connected to the recei-

ver, the stiffness of the linkages, and the frequency of control

commands generated by the pilot or operator. A standard

servo draws between 150 and 600 mA when the motor is run-

ning, and about 8 mA at idle. Super-servos and powerful digi-

tal units can draw peak currents of up to 1300 mA at full

power.

Be sure to select a receiver battery with ample capacity,

bearing in mind the likely current drain and the number of

servos in the model.

Ensure that all mechanical linkages are free-moving, and that

the servo is not obstructed in its travel. A servo running con-

stantly against a mechanical stop or limit draws a very high

current, and will also inevitably suffer damage in the long-term.

When the receiver battery is almost discharged, you may

notice that the servos respond much more slowly. The

moment you notice this, land the model immediately and

echar

ge the battery. To monitor the receiver battery during a

session we recommend the use of a battery controller, which

gives you a useful idea of the state of charge of the battery

between flights.

101

Retaining

screw

Pushrod

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