Manual Robbe Futaba FX-40 (page 46 of 105) (English)

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FX-40

16.10 FAIL-SAFE

FAIL-SAFE SETTINGS

This function is only available in PCM-G3 or PCM-1024 mode.

This means that the corresponding modulation pr

ocess must

be set at the transmitter, and a matching PCM receiver must

be installed in the model.

In the Fail-Safe menu you can set the following parameters for

channels 1 … 12:

1. ‘HOLD’ mode: the last fault-fr

ee signals ar

e stored tempora-

rily in the receiver, and are passed on to the servos if interfe-

rence should occur. These servo positions are maintained

(‘held’) until such time as valid signals are picked up from the

transmitter again. This is the default mode.

2. (F/S) Fail-Safe position: when interference strikes, the ser-

vos run to pr

e-pr

ogrammed positions which are set at the

transmitter; these settings are also stored temporarily in the

receiver.

3. An additional feature - the ‘Battery Fail-Safe’ function: as

soon as the voltage of the r

eceiver battery falls below a value

of about 3.8 V

, the throttle servo runs to idle in order to warn

the pilot that the airborne battery is almost flat. If this should

happen, you must land immediately

The following illustrations show the Fail-Safe menu for fixed-

wing models and helicopters, with fail-safe settings alr

eady

enter

ed.

Each channel is listed individually. The first column covers the

fail-safe mode (Hold or F/S), which can be changed as requi-

red. To do this simply activate the appropriate field, and con-

firm the security query by pressing ‘YES’.

If you opt for ‘Fail-Safe’, it is then necessary to enter the cor-

rect settings for the servo positions. This is carried out by

moving the associated transmitter controls to the desired

position, and operating the (F/S-POS) field for that channel. In

each case the servo position you enter is displayed as a per-

centage figure. A security query is then displayed; if you con-

firm with ‘Yes’, the new Fail-Safe value is stored. This process

has to be repeated for all the channels which you have set to

‘F/S’ mode.

In the second column you can use exactly the same procedure

to program the Battery Fail-safe feature, separately for each

channel. The display changes from ‘OFF’ to ‘B.F/S’.

The warning position for the selected servo is entered using

the method already described; the value is displayed on-

screen in the form of a percentage. We recommend that you

set up the throttle or airbrake / spoiler servo for this warning

function.

It is possible to reset the Battery Fail-Safe function; this is

achieved by assigning a transmitter control to the function:

activate the appropriate field at top right of the screen. When

you do this, the switch select menu appears.

You have to mark the transmitter control or switch you wish to

use for this function. The set control is displayed on the gra-

phic screen. If you wish to reset the switch select function,

press the ‘NONE’ button.

The ‘On-posi.’ but-

ton field is used to

determine the direc-

tion of effect of the

switch. If you prefer

to use a transmitter

control instead of a

switch, you can also

program hysteresis

(a dead zone) and a

switch range (linear

or symmetrical) in

addition to the swit-

ching position. The

coloured graphics

make the procedu-

res virtually self-

explanatory: basi-

cally you just move

the transmitter stick to the desired position, and press the

‘Sel.’ (Select) field. The software then adopts the set position

and displays it.

The F/S settings necessarily vary according to the set model

type. For example, sensible settings for a model helicopter

would cause it to take up a stable hover; for a fixed-wing

model aircraft it should take up a broad turning pattern. The

basic requirement is that brief interference should trigger a set

of fail-safe settings which would automatically enable the

model to adopt an inherently stable flight pattern even when

not under the pilot’s control, until contact with the transmitter

is restored. If you select the throttle function, don’t set the

throttle value too low, otherwise there is a danger that the

motor will stop.

You can check the settings by switching the transmitter off and

observing the reaction of the servos connected to the receiver.

Note:

When you select a fixed-wing model aircraft or helicopter as

the model type, a fail-safe setting is automatically pr

grammed for the thr

ottle function. It is important to check

whether the default setting is correct for your application.

Change it if necessary, or set the function to HOLD mode if

you prefer.

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