Manual Robbe Futaba FX-40 (page 63 of 105) (English)

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Model menu

Programmable mixers

FX-40

If necessary, the mode of the Offset mixer can now be

changed; two modes are available:

Manual control: when you operate the switch, the

servo runs to the Offset position selected under ‘ON’,

at the set speed and with the set delay, and remains there

as long as the switch is in the ‘On’ position. The servo only

moves again when the switch is moved back to the ‘Off’

position; it then returns to the starting position - as set

under ‘OFF’ - using the set speed and delay.

Timer control: in this mode the servo runs to the pres-

cribed ‘On’ position, as described for manual control,

when the switch is operated.

However, in contrast to manual control, it does not stay in

this position, but returns automatically to the starting point

when the pre-set dwell time (Duration) has elapsed.

This Offset mixer is very convenient, and can be used to

implement sequences involving up to four functions, either

under manual or automatic control.

Typical practical applications include the sequential retrac-

tion and extension of a scale retractable undercarriage,

whose functions can be controlled very accurately. By set-

ting the times carefully, you can arrange for various wheel

doors to open in turn, after which the wheels then extend.

The Offset value can be entered as a percentage figure in

the ‘Offset’ fields, separately for the ‘On’ and ‘Off’ states:

mark the appropriate field, and adjust the settings in the

familiar way using the arrow buttons. The adjustment range

is +300% to -300%. The default setting is 0%; marking the

‘Reset’ button restores the defaults.

Fine-tuning is also available for the Offset mixers. The first

step is to define a transmitter control in the appropriate

column, using the transmitter control select menu as pre-

viously described. After this you must set the effect range in

the ‘Rate’ field using the arrow buttons; the adjustment

range is +100% to -100%. The default setting is 0%; mar-

king the ‘Reset’ button restores the defaults. The transmit-

ter control you select for fine-tuning an Offset mixer also

has four operating modes; they are absolutely identical to

those of a normal mixer (see page 61).

You may also wish to optimise the servo transit speed for

the task in hand: the speed of the servo can be adjusted in

small increments, separately for the ‘there’ and ‘back’

directions. The adjustment range is 0 to 27 increments. Ple-

ase note: the higher the number, the more slowly the servo

moves. The maximum value (27 increments) corresponds to

a duration of nine seconds. The default setting is always ‘0’.

When you mark one of the fields ‘there’ or ‘back’, the but-

ton fields for the arrows appear at the right margin. It is pos-

sible to make adjustments in steps of one increment or ten

increments. Pressing the ‘Reset’ button restores the default

setting.

A delay time can be programmed using virtually the same

procedure; delays in the range 0.0 to 9.9 seconds can be

set, separately for the ‘Start’ and ‘Stop’ phases. Pressing

the double arrow buttons increases or reduces the delay by

one second; operating the single-arrow buttons produces

increments of 0.1 second.

The programming of an Offset mixer is concluded by acti-

vating a switch using the standard procedure: mark the cor-

responding button field in the bottom line, and define the

switch in the switch select menu which then appears. The

direction of effect of the switch can also be set in the usual

way. The status of the mixer is displayed as ‘On’ or ‘Off’ -

according to the position of the switch - in the left field in

the bottom line.

OFFSET MIXER AS MOTOR-CUT SWITCH

Offset mixers also offer the possibility of mixing a fixed

value into the primary channel. This value can be up to

300%, as shown in the screen shot. This facility can be

used, for example, to make absolutely certain that the

motor of an electric-power

ed model cannot burst into life

unexpectedly, even if you move the thr

ottle stick by mis-

take; this is a very useful safety feature. If you program an

Offset mixer, and set the Offset value to -300%, the throttle

stick can be moved to any position without the motor star-

ting, because it is impossible for the stick travel to override

the value set by the Offset mixer. The motor can then only

be controlled in the normal way if you first disable the Offset

mixer by operating the associated switch. This switch is not

interrogated during the safety switch query when the trans-

mitter is switched on.

SERVO CENTRE ADJUSTMENT

The comprehensive nature of the FX-40’s programmable

mixers makes them suitable for a very wide range of special

functions. As a further example we will mention her

e the

possibility of corr

ecting the neutral position of the wing or

elevator servos using an analogue or digital trimmer.

All you have to do is select the hardware control (‘H/W’) you

wish to use, and mix a small input into the servo output you

wish to adjust.

This constitutes an ultra-fast method of correcting any mini-

mal control surface deviations which show up just before a

flight.

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Robbe Futaba FX-40 Manual

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