Multiplex PROFI mc 4000 - Adjust the Idle Setting

This is how it works ...
- 15 -
This is how IDLE-UP works:
The IDLE-UP control limits the travel of the throttle
servo. The COLLECTIVE PITCH stick only affects the
throttle curve if the value concerned lies below the
limit set by idle-up. The diagram below shows the
connection.
The hatched-in area in the diagram above is blocked
for the throttle servo when the IDLE-UP slider is in the
marked position.
Where the throttle curve lies within the hatched-in
area, throttle is limited to the value set by the IDLE-UP
control. In the diagram above this is about 60%.
You will see that the throttle curve falls below the limit
in the mid-range. In this area the throttle servo will
respond to movements of the COLLECTIVE PITCH
stick.
If IDLE-UP is pulled right back (e.g. for starting the
motor), the throttle servo no longer responds to the
COLLECTIVE PITCH stick at all.
In this example the throttle is set to about 20%.
You can see that the throttle signal can be reduced to
0% using the IDLE-UP control, which means that the
motor could be cut. With version 1.0 of the software
this was the only possibility. The facility to set a value
for idle is only available in Version 2.0 of the software.
How to adjust the idle setting:
The IDLE-UP control should be set in such a way that
the motor runs at a reliable idle at the rear end-point.
We will assume that the throttle servo needs to be set
to -70% to achieve this.
The next diagram illustrates how the carburettor
opening varies in relation to the values for the throttle
servo, the transmitter control IDLE-UP and the
THROTTLE CURVE.
The THROTTLE CURVE can only be set to values in
the range 0% to 100%.
IDLE-UP works between -100% and +100%.
The DYN. THROTTLE servo also works within the
range -100% and +100%, corresponding to the full
rotational arc of the servo from one end-point to the
other.
The three „holes“ on the right of the diagram show
how the carburettor opening varies at the different
settings.
For example, if you set an idle value of 15% (with
reference to the throttle curve), that equates to a value
of -70% at the throttle servo.
The same applies if you want to limit the travel of the
transmitter control for idle-up.
This is how you set an idle value of 15%:
1. Select the transmitter control IDLE-UP, then the
TRAVEL option
Starting from the operating screen press   
to move to the menu for transmitter control op-
tions. Then use / or the digi-adjustor to se-
lect the transmitter control IDLE-UP.
Press  to open the Options field and search for
TRAVEL.
2. Open the adjust field for TRAVEL
Pressing the  button opens that field.
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