Operation Manual

PROFI mc 4000PROFI mc 4000
Version 2.0
13
You will find the switch for DIRECT THROTTLE un-
der the options for the COLLECTIVE PITCH control.
CONTR D :COL.PITCHÄ
;DIR.THROT
,S06'*
In the base types the switch S06 is assigned here as
standard. If you assign ON instead of a switch, then
throttle is always controlled via the transmitter control
IDLE-UP - except during AUTO-ROTATION.
'' TIP:
For electric-powered helicopters DIRECT THROTTLE
ON is the most suitable mode of operation.
If you use THROTTLE as the transmitter control and
servo, then the link with AUTO-ROTATION is not
automatically present, and must be programmed
separately.
This is how IDLE-UP works:
The IDLE-UP transmitter control limits the travel of
the throttle servo. The COLLECTIVE PITCH stick af-
fects the throttle curve only if the associated value is
below the limit set by idle-up. The following diagram
shows the connection.
When the idle-up slider is in the position shown, the
shaded area in the diagram is blocked for the throttle
servo.
Where the throttle curve runs into the shaded area,
throttle is limited to the value set by the IDLE-UP con-
trol. In our diagram that is about 60%.
In the middle range the throttle curve dips below the
limit. Here the throttle servo will react 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.
In this example throttle is set to about 20%.
In this diagram you can also see that throttle can be
reduced down to 0% using the IDLE-UP control, i.e.
you could stop the motor in this way. In version 1.0 of
the software this was the only possibility. The ability
to define a value for idle is only possible in Version
2.0 and later.
This is how to adjust the idle speed:
Adjust the IDLE-UP transmitter control so that the mo-
tor idles smoothly and stably at the rear end-point.
We will assume that the throttle servo is at -70%
when this is the case.
The next diagram is intended to show how the size of
the carburettor opening varies in relation to the values
for the throttle servo, the IDLE-UP control and the
THROTTLE CURVE.
The THROTTLE CURVE is set to a range of values
between 0% and 100%.
IDLE-UP works between -100% and +100%.
The DYNAMIC THROTTLE servo also works over
the range -100% to +100%, which corresponds to the
full angular travel of the servo from one end-point to
the other.
The three „holes“ on the right-hand side of the dia-
gram show how the carburettor opening corresponds
to these settings.
For example, if you want to set the idle value to 15%
(with reference to the throttle curve), this corresponds
to a value of -70% at the servo.
The same applies if you want to limit the travel of
the transmitter control for idle-up.