57
Column 5 “limit”
The servo travels generated by superimposed mixers,
and by other parameters such as substantial cen-
tre offsets and increased travel, are cumulative, and
at the extremes these can exceed the normal limits.
All
GRAUPNER/JR
servos have a reserve of an ad-
ditional 50% beyond normal travel, so the transmitter
normally limits servo travel to 150% to avoid damage
caused by the servos striking their end-stops.
In some cases it may be advisable to set the limit-
er to restrict servo travel to a lower value, for examp-
le, if there are mechanical restrictions in the linkage;
this should only be done if the control travels normally
required in fl ight will not be reduced unnecessarily by
decreasing servo travel in this way.
Example:
A servo may be controlled by two transmitter controls
through different mixers. For reasons specifi c to the
model, the maximum servo travel must be restricted
to 100%, because – for example – the rudder would
collide with the elevator at more than 100%. This pre-
sents no problems as long as only one of the two
transmitter controls is used. The problem arises when
both controls (e.g. aileron and rudder) are used simul-
taneously, with the result that the rudder signal is gre-
ater than 100%. Under these circumstances the lin-
kages and the servos could be overloaded, and could
even fail.
To avoid this problem it is really essential to limit the
rudder’s travel by setting individual travel limiters. In
our example – the rudder – the value should be just
under 100%, as we know that the control surfaces
collide at 100%.
Select the
SYM
fi eld to set a symmetrical travel limit,
and select a value within the range 0 to 150% of nor-
mal travel. If you wish to set different limits for each
side of neutral, select the
ASY
fi eld. Now press the
rotary control briefl y, and set the travel limit values in
each inverse fi eld in turn using the rotary control. For
an asymmetrical setting move the associated trans-
mitter control to each end-point in turn; the inverse
fi eld then switches between the negative and positi-
ve directions.
(
CLEAR
= 150%).
The graph shows the servo
travel limited to 90%, with a
travel setting of +150%.
Program description:
Base setup model
Column 4 “travel”
In this column you can adjust servo travel symmetri-
cally or asymmetrically (different each side of neutral).
The adjustment range is 0 ... +150% of normal ser-
vo travel. The reference point for the set values is the
setting in the “Centre” column.
To set a “symmetrical” travel, i.e. to adjust travel
equally on both sides of neutral, select
SYM
; se-
lect
ASY
to set asymmetrical travel. In the latter case
move the associated transmitter control (stick, slider,
rotary knob or switch module) to the appropriate end-
point; when you press the rotary control the inverse
servo travel fi eld switches between the left fi eld (ne-
gative direction) and the right fi eld (positive direction).
Pressing
CLEAR
resets the changed parameter to
100%.
Important:
In contrast to the »
Control adjust
« menu, this set-
ting affects the servos directly, regardless of how the
control signal for the individual servo is generated, i.e.
either directly by a stick channel, or by means of any
type of mixer function.
0
2 0
4 0
6 0
8 0
1 0 0
1 5 0
%
0 2 0 4 0 6 0 8 0 1 0 0 %
Ser
v
o
tr
a
v
el
Transmitter control travel
The graph alongside shows an
example of asymmetrical servo
travel, with a travel setting of
-50% and +150%.
0
2 0
4 0
6 0
8 0
1 0 0
1 5 0
%
0 2 0 4 0 6 0 8 0 1 0 0 %
Ser
v
o
tr
a
v
el
Transmitter control travel
Summary of Contents for MC-22S
Page 1: ...1 mc 22s GB mc 22s 3D Rotary Programming System Programming manual ...
Page 33: ...33 Digital trims ...
Page 55: ...55 Program description Base setup model ...
Page 77: ...77 Program description Flight phases ...
Page 89: ...89 Program description Mixers ...
Page 174: ...174 ...
Page 175: ...175 ...
Page 176: ...176 ...
Page 177: ...177 ...
Page 178: ...178 ...