Futaba GYA431 - Manual (Page 2)

LIMIT
GAIN
Servo
Preflight Adjustments
Flight Adjustment
Gyro Sensitivity and AVCS Switching
AVCS / NORMAL Modes
Servo Operation on the Ground
Link the servo in accordance with the kit instruction manual.
Adjust the linkage rod so that the trim amount is as small as pos-
sible.
Digital/Analog servo selection
Selection of an analog and digital servo is performed in a limit
trimmer's setting position.
A limit trimmer's motion is as follows.
Digital servo → A trimmer is adjusted by the Right rotation from
the middle point.
Analog servo → A trimmer is adjusted by the Left rotation from
the middle point.
The amount of limits -- the halfway point -- the minimum -- it will
become the maximum quantity if it is made to rotate to Max, re-
spectively. The check of operational mode is discriminable in the
display color of LED. The stability of digital-servo mode of a flight
increases in order to perform a high-speed control action.
Setup before a flight [ Remote gain use ]
Adjust the gyro sensitivity at the transmitter.
At S.BUS connection or when gyro port 2 and the gyro sensitivity CH
of the receiver are connected
1
Use the aileron/elevator selector switch to select aileron or
elevator. (Aileron: AIL Elevator: ELE)
2
Turn on your transmitter's power. Set the gyro sensitivity to about
50% at the normal side (minus rate side) in accordance with the
transmitter instruction manual. 50% of normal sensitivity will be -70%
at the rate of the sensitivity CH so that a next graph may be seen and
understood.
3
Turn on the receiver power. When the gyro starts the LED flashes
green and initialization begins. When initialization ends the servo
performs reciprocating operation to the left and right. This places the
Adjust the transmitter and gyro while repeatedly taking off and
landing and with the aircraft on the ground.
Transmitter adjustments must not be made while flying
because it is dangerous.
1
Fly the aircraft and trim it by turning off the gyro at 0% sensitivity
or in the
NORMAL mode. After trimming, switch the gain switch
between 0% sensitivity (or NORMAL mode) and the AVCS mode three
times at an interval of within one second and then set the gain switch
to the AVCS mode position. This memorizes the AVCS mode neutral
trim position at the gyro. In the AVCS mode, do not perform trimming
during flight.
2
Adjust the gyro sensitivity so that hunting (deflection of the
aircraft in small increments) does not occur in the control axis
direction. The gyro sensitivity is different depending on the area of
the aircraft rudder, air speed, and gyro used. Initially try changing
the sensitivity in 5% steps. If hunting is excessive, the aircraft may be
damaged. Hunting tends to stop when the airspeed is lowered.
The gyro has two operation modes: NORMAL mode and AVCS
mode. In the AVCS mode, angle control is performed at the same
time as NORMAL mode rate (rotating speed) control. In the AVCS
mode, the neutral keeping force is stronger than the NORMAL
mode and the flight attitude of the aircraft is forcefully main-
tained. During knife-edge flying, idiosyncrasies of the aircraft
when climbing will be compensated automatically. On the other
hand since the rudder follows when the aircraft stalls, pay spe-
cial attention to the elevator axis. To be safe, switching to the
NORMAL mode when taking off and landing is recommended.
If the stick is moved when the airplane is on the ground, the ser-
vo will move to the limit position. In the AVCS mode, the servo
will not return to the neutral position even if the stick is set to
the neutral position, but this is normal.
If the stick is moved fully to the left or right three or more times
within one second, the servo will temporarily return to the neu-
tral position.
When the remote gain function is used normally and AVCS
mode switching is performed in accordance with the direction
of operation of the transmitter’ s remote gain channel. At the +
rate side, the AVCS mode is selected and at the – rate side, the
NORMAL mode is selected. The sensitivity is changed by adjust-
ing the end point rate. If the transmitter has a gyro sensitivity
setting mixing function, the sensitivity setting is performed di-
rectly.
When the remote gain function is not used, the clockwise di-
rection from the center of the sensitivity setting trimmer is the
AVCS mode (not used) and the counterclockwise direction is the
NORMAL mode. At the center position, the sensitivity becomes
zero. When the trimmer is turned fully to the left or right, the
sensitivity becomes 100%.
The sensitivity setting criteria by end point is shown in the
figure below. The sensitivity becomes zero between end point
-40% to +40% and becomes 100% at end point 100%.
Refer to the transmitter instruction manual and set the end
point. When AVCS is used, setting the 3-positions switch to the
sensitivity CH (there are types which cannot be set by transmit-
ter) and setting it as shown above is recommended. In the case
of a 2-positions switch, inhibiting the gyro at 0% sensitivity such
as NORMAL mode and sensitivity 0% and AVCS mode and 0%
sensitivity is safe.
Trimmer movement when the
remote gain function is not used
(when S.BUS is not used and port
2 is not connected) . Please do not
use AVCS, when you do not use re-
mote gain. Because, neutral memo-
ry cannot be performed. And taking
off and landing being dangerous.
LIMIT
GAIN
Tilt the airplane to the left on
the ground and check that the
ailerons operate to the right. (In
the case of aileron control)
Tilt the airplane to the
left on the ground and
check that the ailerons
operate to the right.
(In the case of aileron
control)
It is good for carrying
out a knife edge.
It is good for carrying
out a beginners and
taking off and landing.
<2nd servo operating direction>
During aileron mode operation
the 2nd aileron servo
moves in the
same direction as the
aileron servo. In the elevator
mode, the 2nd elevator servo
moves in the opposite direc-
tion of the elevator servo.
Mount the servos as left and
right objective linkage.
LIMIT
GAIN
5
In the case of aileron control, switch the gyro direction switch and
adjust the direction of operation of the gyro so that the ailerons
move all the way to the right when the airplane is tilted to the left.
In the case of elevator control, switch the gyro direction switch and
adjust the direction of operation of the gyro so that the elevator servo
moves in the down direction when the airplane is moved in the up
direction. If the direction of operation of the gyro is incorrect, flight
will become impossible so make the settings positively.
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
LIMIT
GAIN
＜ A gain trimmer's work ＞
First,we recommend to
start with NORMAL30%.
＜ GAIN CH ＞
LIMIT GAIN LIMIT GAIN
When a remote gain function is off, it becomes only analog servo
mode. A trimmer becomes only for gain.
(Digital-servo use is possible)
*When you use an analog servo, please be sure to set to ana-
log servo mode. If it sets to digital-servo mode and it is op-
erated, there is a danger that a servo will be destroyed.
gyro into the ready state. During initialization secure the fuselage
so that it will not move and fix the transmitter stick at the neutral
position. Initialization takes about 3-5 seconds after the receiver
operates. After initialization the LED lights green. If the neutral
position has changed, the LED will light orange. In this case, restart the
gyro. Move the stick and check that the servo operates.
4
Move the stick to the maximum left and right and adjust the gyro
limit trimmer so that the servo operating angle is at the
maximum position at which there is no interference with the linkage.
FUTABA CORPORATION
1080 Yabutsuka, Chosei-mura, Chosei-gun, Chiba-ken, 299-4395, Japan
Phone: +81 475 32 6982, Facsimile: +81 475 32 6983
©FUTABA CORPORATION 2012, 6 (1)
[ When remote gain function is off ]
Adjust the gyro sensitivity with the GYA431 trimmer.
Do not use the AVCS mode.
All remote gains are effective at S.BUS connection. When port 2 is not
connected when S.BUS is not used remote gain is inhibited. In this case,
the limit trimmer is automatically changed to gyro sensitivity setting
trimmer.
(Limit position is fixed at operating angle left and right 55. A servo is
fixed to analog mode.)
* In this case, 2 gain setup with a transmitter and 4 limit adjustment
of differing in a procedure are lost. And as shown in a figure, gain is
adjusted of the trimmer of GYA431.
● Trimmer operation
*Make trimmer adjust-
ments gently by using the
included mini screwdriver.