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rev 3.0.06
4.2
Calibrate servo centres and end points
Next, calibrate the servo centres and end-points. This is done in the
OUTPUTS
menu, by means of
output curves
. The
servo end-points you set will be ‘hard’, i.e. the servos can never travel beyond these points. This allows you to
protect against servo over-travel and thus avoid damaging your linkages.
When setting the end-points, consider all possible inputs. For example, when setting up the end points for flaps,
allow enough movement for both roll and crow inputs. If the end points are too conservative, then the servo will
stop early leading to some deadband at the controls; this will often be acceptable and/or unavoidable – some
judgement is required.
If you don’t know the movements required
for your particular model, simply set your end-points to the maximum
possible, subject to linkage geometry and equal movement on both sides.
New in v3: all adjustments are made using output curves. Min/Max/Subtrim must be left at their default values
(-150,150,0 respectively).
Channel
Calibration procedure
CH 4
–
Lt Flap
Start by calibrating left flap (CH4). You’ll first set the end points, then adjust the
centre point to provide a linear response. Ignore the flap neutral, it will be
adjusted in a later step.
Enter CAL mode
Set switch SA to
middle
position
In the
OUTPUT
menu, highlight
CH4
Skip to curve field ‘
CV14’
, and press
[long ENTER]
to open curve editor
o
Throttle stick back (↓), adjust
point 1
for lower end point. Allow for
both crow and aileron inputs.
o
Throttle stick forward (↑), adjust
point 3
for upper end point. Allow
for any aileron-to-flap mixing.
o
Adjust
point 2
so it lies on the straight line thru points 1 and 3.
Move throttle stick from one end to the other, observing step intervals. If
necessary fine tune point 2 to equalise intervals (i.e. optimise linearity).
CH 3
–
Rt Flap
Next, calibrate the right flap (CH3). You’ll adjust a 5-point curve to precisely match
the left flap.
Enter CAL mode
Set switch SA to
middle
position
In the
OUTPUT
menu, highlight
CH3
Skip to curve field ‘
CV13’
, press
[long ENTER]
to open curve editor
Adjust points 1 – 5 to exactly match the left flap:
o
stick
fully back
, adjust
point
1
o
stick
½
-back
, adjust
point
2
o
stick to
centre
, adjust
point
3
o
stick to
½
-forward
, adjust
point
4
o
stick
fully forward
, adjust
point
5
To match the end points on left and right sides, it may be necessary to reduce one
or other end points for the left flap.
Flap neutral
Next, set the flap neutral:
Enter CAL mode
Set switch SA to
down
position. An adjustable offset is applied to each flap.
Open the
GLOBAL V.
menu.
Highlight
GV5(
‘
FlNeut
’
)
and skip to the
FM0
column.
Adjust GV5 for correct neutral. If the flaps are not perfectly in line with each
other, then redo calibration for
RtFlap
above, paying particular attention
around the neutral position.
