GRAUPNER MC-22S, Руководство по программированию

Страница: 63 / 180

63 Program description: Transmitter controls
Throttle limit in conjunction with “Expo throttle li-
mit” in the “Helicopter type” menu, page 54
The sensitivity of the throttle limit slider can be chan-
ged by setting an exponential curve. For example, this
may be desirable if the throttle limiter is used to regu-
late the idle setting. The expo throttle limit curve is de-
scribed in the »
Helicopter type « menu; see page 54.
Time delay for the throttle limiter
The throttle limiter could cause an abrupt opening
of the throttle, and to avoid this it is advisable to as-
sign an asymmetrical time delay to the throttle limit-
er (input 12) when the control is moved to its forward
end-point. This applies in particular if you wish to use
an external switch or a switch module to control the
throttle limiter.
Example:
The Ch1 stick is at the collective pitch minimum posi-
tion, but the throttle servo is not at the motor idle set-
ting, in accordance with the throttle curve set in the
»
Helicopter mixer « menu. The throttle limiter control
(slider) has already been assigned.
In the “Travel” column, set the control travel in such a
way that the motor idle position is located at the bot-
tom end-stop:
1. Use the rotary control to select the ASY or SYM
fi eld.
2. Press the rotary control.
3. If you have selected
ASY , move the control in the
appropriate direction. Set the required maximum
and minimum values (no100% and +125%)
in the inverse video fi elds using the rotary control.
4. Press the rotary control to conclude the input pro-
cess.
5. Select the ASY fi eld in the “–Time +” column.
6. Move the assigned control to the forward end-
point, so that the inverse video fi eld moves to the
right.
7. Use the rotary control to enter the desired time de-
lay, e.g. 4.0 sec. The pre-set time should be se-
lected to suit the throttle opening at the collective
pitch minimum position. You will need to carry out
practical testing to check that the set value suits
you.
8. Press the rotary control or the ESC button to com-
plete the process.
The screen display might now look like this:
%NTER#NTR
%NTERFREE
4H,#NTR
OFFSETTRAVELTIME
3%,
L
!39 39- !39 39- 3%,
%NTER#NTR
Note:
The throttle restriction set by the throttle limiter is
shown as a horizontal bar in the “Channel 1
thrott-
le” curve of the » Helicopter mixer « menu; see pages
92 … 93:
C h a n n e l 1 T h r o t t l e
I n p u t - 6 0 %
C u r v e O u t p u t - 6 0 %
o f f P o i n t ?
®
O
U
T
P
U
T
- +
1
10
0
The output signal to the throttle servo set by the
Ch1 stick cannot be greater than the set position
of the horizontal bar.
In this example the throttle limit control is set to -60%,
and therefore restricts the effect of the Ch1 stick on
the throttle servo to around -60% of full travel.
Note:
Of course, an alternative method of setting the motor
to a low idle for starting would be to use a fl ight pha-
se switch (see »
Auxiliary switch «, » Phase setting «
and » Phase assignment « menus; pages 75 … 80),
either by switching to the auto-rotation phase (“AR”)
or another fl ight phase, and pre-selecting the AR
throttle servo setting using the »
Helicopter mixer «
menu; see page 90. Set up the “Channel 1 thrott-
le” mixer in such a way that the motor is at idle when
the collective pitch stick is at the minimum position.
However, these two alternative methods are seldom
used. We recommend instead that you should imme-
diately start using the throttle limiter and get used to
the new system; see also page 92.
Throttle limiter position