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286 Programming examples - Parallel operating servos
Parallel operating servos
A second servo running in parallel is often required,
such as when brake fl aps or spoilers installed in the
wings or the left and right elevator or a double fi n
should be actuated by a servo or a large rudder fl ap
should be simultaneously controlled by two servos
due to high throw forces.
In principle, this task could also be solved by
connecting the servos together on the model side
using V-cable. However, the disadvantage here is
that servos combined in this manner can no longer
be adjusted individually and separately from the
transmitter – thus negating the potential for fi nely
tuning respective servos to one another with a
computerized remote control system. A similar
situation is given for the so-called "Channel mapping"
feature of the »Telemetry« menu. Here too there are
certain limitations involved when compared to the
transmitter's adjustment possibilities.
The fi rst example, therefore, describes the coupling
of two brake or spoiler servos, the second describes
the operation of two or more throttle servos and the
third describes the coupling of two elevator servos.
The "two rudder servos" example on the next page
describes the coupling of two rudder servos, whereas
Variant 1 is preferable for applications of this type
because the use of a cross-mixer« is quicker and
easier to program. In contrast, the second variant,
also described on the next page, additionally permits
asymmetric and/or non-linear curves through use of
the »Free mixer« menu.
such as when brake fl aps or spoilers installed in the
wings or the left and right elevator or a double fi n
should be actuated by a servo or a large rudder fl ap
should be simultaneously controlled by two servos
due to high throw forces.
In principle, this task could also be solved by
connecting the servos together on the model side
using V-cable. However, the disadvantage here is
that servos combined in this manner can no longer
be adjusted individually and separately from the
transmitter – thus negating the potential for fi nely
tuning respective servos to one another with a
computerized remote control system. A similar
situation is given for the so-called "Channel mapping"
feature of the »Telemetry« menu. Here too there are
certain limitations involved when compared to the
transmitter's adjustment possibilities.
The fi rst example, therefore, describes the coupling
of two brake or spoiler servos, the second describes
the operation of two or more throttle servos and the
third describes the coupling of two elevator servos.
The "two rudder servos" example on the next page
describes the coupling of two rudder servos, whereas
Variant 1 is preferable for applications of this type
because the use of a cross-mixer« is quicker and
easier to program. In contrast, the second variant,
also described on the next page, additionally permits
asymmetric and/or non-linear curves through use of
the »Free mixer« menu.
Two brake or spoiler servos
In a situation where there is one installed servo for
operation of brake fl aps and/or spoilers in each wing
half then the pre-set linear control characteristics
for the »Channel 1 curve« menu should remain
unchanged.
Then connect one of the two servos to Output 1,
provided for this purpose by standard, and the
second to an arbitrary free receiver connection
5 … 16, such as Output "8". Subsequently switch
to the menu …
In a situation where there is one installed servo for
operation of brake fl aps and/or spoilers in each wing
half then the pre-set linear control characteristics
for the »Channel 1 curve« menu should remain
unchanged.
Then connect one of the two servos to Output 1,
provided for this purpose by standard, and the
second to an arbitrary free receiver connection
5 … 16, such as Output "8". Subsequently switch
to the menu …
»Control adjust«
(page 108)
… and, using the selection keys, assign "Control 1" in
the Input 8 line :
the Input 8 line :
0%
+100%
I5
I6
I7
I8
Typ SEL
+100%
0.0 0.0
– travel +
–time+
0%
+100%
+100%
0.0 0.0
0%
+100%
+100%
0.0 0.0
0%
+100%
+100%
0.0 0.0
GL
GL
GL
fr
---
fr
fr
Cn1
---
---
---
offset
GL
Nor mal
Since the spoiler on Output 1 can normally only be
operated on a fl ight-phase dependent basis, it is
strongly recommended that the "Typ" column for the
input used is left at its "GL" default setting.
Also the remaining values should be left at their
default settings. If necessary, carry out the required
servo travel adjustments in the »Servo adjustment«
menu. There you can also adjust the travel of servo
1 and 8 to one another, if necessary.
operated on a fl ight-phase dependent basis, it is
strongly recommended that the "Typ" column for the
input used is left at its "GL" default setting.
Also the remaining values should be left at their
default settings. If necessary, carry out the required
servo travel adjustments in the »Servo adjustment«
menu. There you can also adjust the travel of servo
1 and 8 to one another, if necessary.
Multiple-motor aircraft
As described above, a model can also be operated
with two or more motors.
The fi rst throttle servo and/or the fi rst motor control
is connected as usual to (receiver) Output 1 and
each additional throttle servo and/or each additional
motor control is connected to a free (receiver) Output
6 … 12. The inputs of respective assigned control
channels are then each assigned to Control 1; for
example :
As described above, a model can also be operated
with two or more motors.
The fi rst throttle servo and/or the fi rst motor control
is connected as usual to (receiver) Output 1 and
each additional throttle servo and/or each additional
motor control is connected to a free (receiver) Output
6 … 12. The inputs of respective assigned control
channels are then each assigned to Control 1; for
example :
0%
+100%
I9
I10
I11
I12
Typ SEL
+100%
0.0 0.0
– travel +
–time+
0%
+100%
+100%
0.0 0.0
0%
+100%
+100%
0.0 0.0
0%
+100%
+100%
0.0 0.0
GL
GL
GL
---
Cn1
---
---
---
offset
GL
Nor mal
Cn1
Cn1
Cn1
Important notice:
Since the motor control unit should be available
regardless of a currently active fl ight phase, make
sure to leave the standard default "GL" in the "Type"
column.
Since the motor control unit should be available
regardless of a currently active fl ight phase, make
sure to leave the standard default "GL" in the "Type"
column.
Two elevator servos
Two elevator servos should be switched in parallel.
According to the receiver assignment plan, see
page 61, the receiver output 8 is intended for the
connection of the second elevator servo.
This would be taken into account on the software side
in the pre-confi guration of a corresponding mixer. You
can fi nd this in the …
Two elevator servos should be switched in parallel.
According to the receiver assignment plan, see
page 61, the receiver output 8 is intended for the
connection of the second elevator servo.
This would be taken into account on the software side
in the pre-confi guration of a corresponding mixer. You
can fi nd this in the …
"Model type"
(page 94)
In this menu, switch to the "Tail" line using the
selection keys, activate the value fi eld with a brief tap
on the center
selection keys, activate the value fi eld with a brief tap
on the center
SET
key of the right key pad then select
the entry "2ELSv3+8":