Manual Robbe Futaba FX-40 (page 45 of 105) (English)

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FX-40

16.8 SERVO CENTRE

SERVO CENTRE OFFSET

When you install the servos in a model, it is always best to

position them in such a way that the servo output arm is in the

neutral position when the trim control on the transmitter is also

at centr

Sometimes the model’s restrictions make this impossible, and

in other cases the neutral position is non-standard due to the

use of different makes of servo. In such instances this function

can be used to bring the servos of all channels to the exact

neutral position.

This option should only be used to correct minor discrepan-

cies, as it inevitably affects servo travel, which may become

restricted and asymmetrical.

We r

ecommend this procedure:

After establishing the corr

ect trim positions through test-flying,

the first step should be to adjust the position of the servo out-

put arms as accurately as possible, and adjust the control sur-

face linkages to the corr

ect mechanical trim settings. At this

stage the trim memory and the settings in this menu should be

left at 0%. Once you have made these adjustments as accura-

tely as possible, you should use this menu to fine-tune the

servo neutral positions to exact centre.

When you select the Servo Centre function, the screen display

looks like this:

The position of the servos for the first twelve channels is dis-

played both in bar form and as a percentage value, and each

channel is clearly identified. If you wish to make a change, the

first step is to mark the channel you wish to adjust.

The display now changes, and you will

see a column of buttons for changing

the setting at the right margin of the

screen. Pressing the single-arrow but-

tons causes the trim to change up or

down by one increment (step). Pres-

sing the double-arrow buttons changes

the setting by ten increments at a time.

The adjustment range is -120 to +240

increments, which corresponds to

about +/- 20° of servo travel. The

default setting is exactly 0 increments.

Once activated, each setting can be reset to the default value

(0 increments) by pressing the ‘Reset’ button.

16.9 SERVO REVERSE

This function is used to reverse the direction of servo rotation

electronically; it is available separately for all servos. This

eans that you do not have to consider the direction of rota-

tion when installing the servos in a model. It is important to set

the correct direction of servo rotation using this function

before you start programming additional model data.

When you select the Servo Reverse function, the screen dis-

play looks like this (shown separately for fixed-wing models

and helicopters):

The current direction of rotation of the servos (NORM or REV)

is shown separately for all fourteen channels. You can reverse

any servo simply by activating the appropriate field. The chan-

nel is then marked, and a security query appears as shown in

the following illustration:

If you press the ‘YES’ button, the servo direction is reversed,

and the procedure is concluded.

This drawing shows the normal and reversed directions of

rotation of one servo.

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Robbe Futaba FX-40 Manual

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