GRAUPNER mx-12 Hott, Programming Manual

Page: 84 / 200

84 Program description: base settings - model helicopter
move the throttle servo or speed controller beyond
the pre-programmed switching threshold.
The default value in the left-hand column for the “motor
OFF” position of the throttle servo is -100%; the default
switching threshold in the centre column is a servo posi-
tion of +150%:
mod name
stick mode
rotor direct
swashplate
1
right
3sv(2rol)
cut off ––– +150% –100%
STARLET
STO
Programming
This is the procedure for changing the default value for
the “motor OFF” position of the throttle servo: briefly
press the central
SET
button of the right-hand touch-key:
the current setting is now highlighted (dark background).
Now use the arrow buttons of the left or right-hand
touch-key to enter a value at which the motor is reliably
“off”. If you are controlling a throttle servo (carburettor)
it is important to ensure that the throttle servo does not
strike its mechanical end-stop, e.g. -125%:
mod name
stick mode
rotor direct
swashplate
1
right
3sv(2rol)
cut off ––– +150%
STARLET
STO
–125%
The default value in the centre column is deliberately
high, as this enables you to stop the motor over the
maximum possible range of servo travel (or speed con-
troller range) simply by operating the switch; the switch
is assigned in the right-hand column later.
However, if you prefer to set a lower switching threshold,
so that the switch only takes effect when the throttle
servo or speed controller is below a certain point, then
you should reduce the pre-set servo travel from +150%.
This is accomplished by moving the throttle / brake
stick until the throttle servo or speed controller is at the
position you prefer, then briefly pressing the central
SET
button of the right-hand touch-key:
mod name
stick mode
rotor direct
swashplate
1
right
3sv(2rol)
cut off –––
STARLET
STO
–125% +100%
The final step is to move to the right-hand column
and assign a switch which you would like to use to cut
the motor (in an emergency) or activate the switching
threshold.
mod name
stick mode
rotor direct
swashplate
1
right
3sv(2rol)
cut off
STARLET
STO
–125% +100% 1
Notes:
You must ensure that the throttle servo does not •
strike its mechanical end-stop when the motor stop
switch is operated.
To set a switching threshold higher than +100%, tem-
•
porarily increase the travel of servo 1 to more than
100% in the “Servo settings” menu, and then restore
line of the “
Base settings
” menu, you can make use of
the “Motor stop” option by assigning a physical switch to
it. When the switch is operated, the speed controller or
throttle servo move to a pre-set position, i.e. the throttle
setting of the speed controller is reduced, or the carbu-
rettor control (throttle) servo moves to the motor OFF
position (or idle position).
The motor OFF (or idle) position is entered in the left-
hand column above the “
SEL ” field; the optimum setting
must be found experimentally.
However, the speed controller or throttle servo only
takes up this defined position in response to the switch if
the throttle signal is below a particular servo position or
switching threshold. This point is defined by entering the
desired servo position (switching threshold) in the centre
column above the “
STO ” field. Your preferred ON / OFF
switch can be selected in the right-hand column.
If the % value entered in the centre column is • higher
than the current servo position, i.e. the current servo
position is
below the switching threshold, then the
change takes effect as soon as you move the switch
to the ON position.
If the % value entered in the centre column is
• lower
than the current servo position, i.e. the current servo
position is
above the switching threshold, and you
move the assigned switch to the ON position, then
the change (speed controller reduces motor speed,
or throttle servo closes the carburettor to the point
defined in the left-hand column) only takes effect
when the servo position first
falls below the switching
threshold (max. +150%).
The speed controller or throttle servo remains at
this motor OFF position until you operate the select-
ed switch again, and use the throttle / brake stick to