Adjust Servolimit For Channels; Programming The Gyro Settings - GRAUPNER GR-18 Manual

Model movement

Adjust servolimit for channels

SERVOLIMIT <
> 1: -150% +150% SEL
2: -150% +150% SEL
3: -150% +150% SEL
4:
-150% +150% SEL
5: -150% +150% SEL
6:
-150% +150% SEL
7: -150% +150% SEL
SERVOLIMIT <
> 1:
-150% +150% STO
2: -150% +150% SEL
3:
-150% +150% SEL
4: -150% +150% SEL
5: -150% +150% SEL
6: -150% +150% SEL
7: -150% +150% SEL

Programming the gyro settings

PID (Proportional Integral Differential) correction
The stabilising effect of the gyro sensors is based fundamentally on three parameters:
P factor: defines proportional correction
P = proportional: if the intended value is not the same as the actual value, then the difference is fed proportionally into
the corrective signal; in simple terms, the input value (e) is multiplied by a fixed value: u(t) = Kp*e(t). Kp is termed the
amplification value. The output value is therefore proportional to the gyro's input value. Proportional correction cannot
occur until a deviation from the intended value is present; if the deviation is 0, then the product is also zero. If the
amplification value is set too high, the P factor causes the model to oscillate and become unstable.
I factor: integral correction (not currently implemented)
D factor: defines differential correction
D = differential: in this case the corrective output value is affected by the rate of change of the input value, i.e. the faster
the model tilts around the axis, the more pronounced the corrective response of the gyro. If the model changes attitude
very gently, then the D factor causes hardly any corrective action. It also makes absolutely no difference how far the
model has already changed attitude; the crucial value is only the speed or rate of the movement. The rate of change is
again multiplied by a factor (as with P correction) to produce the output value. For this reason pure D correction is not
used; it must always be employed in combination with P correction.
AILERON
Control surface response (seen from the tail)
In this menu, you can limit the servo travel for all channels. Limit the servo travel to
the maximum possible deflection, so that the servos can not run in the stop in the gyro
operation. Move the cursor to the desired line (by further downward move of the cursor
will be displayed further channels), here "1" for channel 1 Pressing the SET button is
pressed the "SEL" field in "STO".
Now move the stick of channel 1 in the desired direction and position, while the corre-
sponding percentage display is shown inverted. Now press the SET button again and
the set value is displayed and stored. Go through the procedure for the other channels.
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