GRAUPNER mz-24 PRO - Throttle Limit Function

After initializing a helicopter as a new model memory,
input channel 12 will provide Throttle Limit function-
ality. This function is deactivated by default and re-
mains so until a control switch is assigned.
CH 9.
CH 10.
CH 11.
CH 12.
NONE
NONE
NONE
NONE
INC
RES
DEC
+100%
+100%
+100%
+100%
+100%
+100%
CTL
– Travel +
NEXT
BACK
SERVO
CTL Set
PHASE 1
OFFSET
000%
000%
000%
000%
+100%
+100%
Notice
This input cannot be used for any other use! The
throttle limit will remain deactivated until Ch 12 is
free!
By assigning a control the Throttle Limit function will
be activated and set according to the following de-
scription. In the example below, the DV2 dial has
been assigned to Ch 12:
CH 9.
CH 10.
CH 11.
CH 12.
NONE
NONE
DV 2
INC
RES
DEC
+100%
+100%
+100%
+100%
+100%
+100%
CTL
– Travel +
NEXT
BACK
SERVO
CTL Set
PHASE 1
OFFSET
000%
000%
000%
000%
+100%
+100%
NONE
The standard approach of other remote control sys-
tems is to program two phases: THR.HOLD and no
THR.HOLD. When Ch 12 has been assigned to a
switch and the settings adjusted, it is not necessary
to program both phases.
Instead of THR.HOLD, the mz-24 Pro HoTT transmit-
ter offers more precise options for adjustment, such
as increasing the system speed below hovering to
increase flexibility.
Throttle Limit Function
Meaning and Use of Throttle Limit
Unlike fixed-wing models, the performance of the
power unit for helicopters cannot be directly con-
trolled with the CH1 control stick. Instead, it can
only be indirectly controlled by the gas curve settings
(made in certain helicopter FUNCTION submenus), or
by a governor, if the model has one.
Tip
Individual gas curves can also be adjusted while pro-
gramming the different phases.
Both methods of controlling the output allows heli-
copters to be reliably started and stopped without ad-
ditional intervention by preventing carburetor motors
from approaching idling during normal flight.
The Throttle Limit function elegantly solves this prob-
lem by limiting the position of the throttle servo or the
performance of a motor control unit. The Throttle Limit
Control makes it possible to turn the throttle down to
idle, allowing the trim control of the throttle/pitch con-
trol stick to assume control or to directly turn off an
electric drive. Conversely, the throttle servo or motor
control unit will only reach its full throttle position when
the Throttle Limit Control releases the entire travel.
In the BASE submenu CTL Set, the value of the
(right) +plus side of the Travel column has to be large
enough so that when the Throttle Limit Control is at its
maximum position the full throttle setting achievable
by the throttle curve settingsis not limited. Typically, a
value between +100 % and +125 % is set.
CH 9.
CH 10.
CH 11.
CH 12.
NONE
NONE
NONE
DV 2
INC
RES
DEC
+100%
+100%
+100%
+100%
+125%
+100%
CTL
– Travel +
NEXT
BACK
SERVO
CTL Set
PHASE 1
OFFSET
000%
000%
000%
000%
+100%
+100%
The value on the (left) -minus side of the Travel col-
umn should be set to allow an electric drive to be re-
liably turned off with the Throttle Limit Control, or to
allow a carburetor to be closed enough so that the
ICE engine can be turned off in conjunction with digi-
tal CH1 trimming. This value is usually best when left
at +100%.
The variable limitation of the throttle travel allows the
drive to be comfortably started and stopped. Gener-
ally this approach is much safer: for example, it could
prevent the accidental activation of the CH1 control
stick when a helicopter with an idling motor is being
carried to the takeoff site.
If the carburetor or motor control unit is too open, a
beep sounds when you turn on the transmitter or af-
ter a model change, and the following active warning
message appears:
Warning
Thr.HOLD
Thr.POS
Thr.CUT
PHASE
Please select RF ON/OFF
ON
Normal signal
OFF
94 Base menu - Control/switch setting | Throttle limit function