Bedienungsanleitung Multiplex PROFIcar4000 (Seite 9 von 16) (Englisch)

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PROFI mc 4000PROFI mc 4000

Version 2.0

6.4 Servos as input for analogue

switches and control switches

This is how it used to work:

Control switches could only be operated from trans-

mitter controls. It was impossible, for example, to

evaluate the setting of the throttle servo and use that

information to operate a timer.

Helicopters are a good example for this application. In

this case the throttle servo is influenced by the Direct

Throttle switch, the idle-up control, the collective pitch

control and (optionally) even the roll-axis and pitch-

axis functions.. So where do we derive the informa-

tion for the control switch?

This is how it works now:

Quite simply the throttle servo itself (in the case of

helicopters this is usually servo 1) acts as the trans-

mitter switch which operates the timer. It therefore

makes no difference which transmitter control is af-

fecting the servo at any one time.

This is how it’s done:

First move to the „Assign switches“ menu and select

one of the six control switches, then press the b but-

ton to open the field for selecting the transmitter con-

trol. Leaf through the transmitter controls with the

q/n buttons or the Digi-adjustor. First you will see

the controls A to M, then the trim sliders TA to TD.

After these come the twelve servos 01 to 12, any of

which you can select to act as „control“ for the se-

lected switch.

We will assume that you want to use servo 7 to oper-

ate the control switch C3, in which case the screen

looks like this:

Assigning switches

CONTROL SW: C1 Ä

;FROM SERVO : 01

,1-POINT: MAX - 80%_

6.5 Analogue switches with

V-characteristic

This is how it used to work:

The analogue switches could be used to adjust a

value (e.g. a mixer input at the servo) in only one

way. Moving the associated transmitter control from

one end-point to the other either increased or reduced

the value.

This is how it works now:

Starting from the centre point of a transmitter control

a value can now be changed equally for both direc-

tions of travel.

A rudder - elevator mixer may be of debatable use-

fulness in practice, but it makes a good example to

show how this works in fixed-wing applications.

When the model is turning the pilot has to apply

up-elevator to prevent the model diving. The

same correction - up-elevator - is required

whether you are turning right or left.

A movement of the rudder stick must therefore

produce the same effect on the elevator (i.e.

„up“), regardless of whether the stick is moved

left or right.

The diagram shows clearly why we have selected the

description „V-characteristic“ for this method of op-

erating the analogue switches.

For the helicopter pilot gyro suppression is the obvi-

ous application.

The gyro counteracts unwanted movements of a

helicopter around the vertical axis, but it also

tends to damp out intentional commands when

the pilot operates the yaw (tail rotor) stick.

For this reason it is necessary to reduce the ef-

fect of the gyro when you apply a tail rotor com-

mand. This applies regardless of whether the

helicopter is required to rotate right or left.

This is how it’s done:

1. Define the analogue switch

The selection is made as previously in Menu 2:

Assigning/SWITCHES

Assigning switches

ANALOGUE SW.: A1 Ä

;FROM CONTROL: A

,EFFECT : MAX +100%_

To define the V-characteristic you first have to

open the select field for the switch type (x but-

ton). Pressing the y button changes the mode of

operation of the analogue switch

from „normal“ to „V“.

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