Bedienungsanleitung Graupner MC 22S (Seite 133 von 180) (Englisch)

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Servos operating in parallel

In many cases a second servo is required to run in

parallel with an existing servo; for example, if a se-

cond elevator or rudder is to be actuated by a separa-

te servo, or where a second servo is needed to cope

with the very high control forces required by a large

control surface. The same applies where two servos

are required simply due to the high control forces in-

volved.

This task could be solved simply by connecting both

servos together in the model using a conventional Y-

lead. However, this has the drawback that the linked

servos cannot be adjusted individually from the trans-

mitter, i.e. you forfeit the basic advantage of the com-

puter radio control system: freely variable servo set-

tings.

The ﬁ rst variant of the two examples in this section

is preferable for applications of this type, as this kind

of system is simpler and faster to program using a

»Dual mixer«. In contrast to this, the second variant

– using the »Free mixers« menu – has to be used

where asymmetrical and / or non-linear curves are re-

quired.

In this example we want to “wire two rudders in paral-

lel”. The second rudder is connected to the otherwise

vacant receiver output 8.

Variant 1

In the menu …

»Dual mixer« (page 110)

… select one of the two dual mixers, and enter “RU”

and “8” using SEL, as shown in the screen shot:

Of course, the opposed movement „





“, which

would occur via “Input 8”, must not be allowed to take

place in this application. For this reason it is essential

to ensure in the menu …

»Control adjust« (page 58)

E n t e r 5 C n t r 5 0 % + 1 0 0 % + 1 0 0 % 0 . 0 0 . 0

E n t e r 6 C n t r 6 0 % + 1 0 0 % + 1 0 0 % 0 . 0 0 . 0

E n t e r 7 C n t

r 7 0 % + 1 0 0 % + 1 0 0 % 0 . 0 0 . 0

E n t e r 8

f r e e 0 % + 1 0 0 % + 1 0 0 % 0 . 0 0 . 0

o f f s e t - t r a v e l + - t im e +

A S Y

S Y M

A S Y

S Y M

S E L

… that “Input 8” is set to “free”, so that the control

function is separated from the control channel.

If both dual mixers are already in use for other purpo-

ses, you will need to fall back on the next solution.

Variant 2

In this variant you set up a “Tr RU  8” mixer in the

menu …

»Free mixers« (page 102)

L in e a r M I X 1 T r R U 8 = >

L in e a r M I X 2

? ? ? ? - - - -

L in e a r M I X 3

? ? ? ? - - - -

L in e a r M I X 4 ? ? ? ? - - - -

t y p e f r o m t o A d ju s t

S E L

S E LS E L

Selecting “Tr” setting in the “Type” column, so that the

rudder trim acts upon both rudder servos.

Now move to the graphic page and set a SYMmetri-

cal mixer input of +100%:

L in e a r M I X 1 R U 8

M i x i n p u t O f f s e t

+ 1 0 0 %

+ 1 0 0 % 0 %

O U T P U T

1 0 0

S T O

A S YS Y M C L R

Here again, “Input 8” should be programmed to “free”

in the »Control adjust« menu. Alternatively you

could separate control function “8” from control chan-

nel “8” in the menu …

»MIX-only channel« (page 108)

M I X O N L Y C H A N N E L

M I X o n l y

n o r m a l

1 2

3 4

5 6

7 8 9 1 0

1 1 1 2

Programming examples – Fixed-wing models

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Graupner MC 22S Seite 133

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