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Multiplex PROFIcar4000 Manual

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PROFI mc 4000PROFI mc 4000
Version 2.0
9
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“.
… 9 …


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