GRAUPNER mx-20 Hott, Programming Manual

Page: 211 / 296

211 Detail program description - Control adjust
RX SERVO
RX SERVO
REVERSE : OFF
CENTER : 1500
μ sec
TRIM : –000 μ sec
LIMIT– : 150%
OUTPUT CH: 01
LIMIT+ : 150%
PERIOD : 20msec
Before any programming on this display page,
observance of the notices on page 208 is mandatory.
Value Explanation Possible settings
OUTPUT CH Channel selection 1 … depending on
receiver
REVERSE Servo reversal OFF / ON
CENTER Servo center in µs if active (inverse),
dependent on
control position
TRIM Trim position in µs
deviating from the
CENTER position -120 … +120 µs
LIMIT– Travel limit for %
servo travel 30 … 150 %
LIMIT+ Travel limit for %
servo travel 30 … 150 %
PERIOD Cycle time in ms 10 or 20 ms
OUTPUT CH (channel selection)
If applicable, select the line "OUTPUT CH" with the
arrow keys. Press the
SET key of the right touch pad.
The value fi eld is shown inversely. Now set the desired
channel (e. g. 01) with the arrow keys of the right touch
pad.
The following parameters are always based on
the channel set here.
Reverse (servo reversal)
Set the rotational direction of the servo connected to the
selected servo channel: ON / OFF
CENTER (servo center)
The active value fi eld (inverse representation) in the
"CENTER" line shows the current impulse time of the
control channel selected in the "OUTPUT CH" line in µs.
The displayed value depends on the current position
of the control infl uencing this control channel and, if
applicable, the position of its trimming.
A channel impulse time of 1500 µs corresponds to the
standard center position and thus the conventional
servo center.
In order to change this value, select the "CENTER" line
and press the
SET key. Now move the corresponding
control, joystick and/or trim lever to the desired position
and save the current control position by pressing the
SET key again. This position is saved as the new neutral
position.
TRIM (trim position)
In the "TRIM" line" you can carry out the fi ne adjustment
of the neutral position of a servo connected to the
control channel selected in the "OUTPUT CH" line using
the arrow keys of the right touch pad in 1 µs increments.
The value in the "CENTER" line can be adjusted by the
TRIM value set here in a range of ±120 µs.
Factory setting: 0 µs.
LIMIT–/+ (travel limit -/+)
This option is provided for the adjustment of a side-
dependent limit (limiting) of the servo travel (rudder
throw) of the servo connected to the control channel
selected in the "OUTPUT CH" line.
The setting for both directions takes place in a range of
30 … 150 %.
Factory setting: 150 % each.
PERIOD (cycle time)
In this line you determine the time interval of the
individual channel impulse. This setting is adopted for all
control channels.
With the use of only digital servos, a cycle time of 10 ms
can be set..
In mixed operation or with use of only analog servos,
20 ms should absolutely be set, because the latter can
otherwise be "overstrained" and react with "shaking" or
"quivering" as a result.
RX FAIL SAFE
RX FAIL SAFE
INPUT CH: 01
MODE : HOLD
F.S.POS. : 1500 μ sec
DELAY : 0.75sec
OUTPUT CH: 01
FAIL SAFE ALL: NO
POSITION : 1500
μ sec
The description of this menus necessitates a few words
of warning in advance:
"Do nothing" is the absolute worst thing to be done in
this regard. "HOLD" is prescribed in the base setup
model of the HoTT receiver.
In the event of a failure, in the best case scenario the
model fl ies straight ahead for an indefi nite amount of
time and then hopefully "lands" somewhere without
causing signifi cant damage! However, if something like
this happens in the wrong place at the wrong time, the