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Setup before a run [ Remote gain use ]
Gain adjustments are carried out with a transmitter.
Follow this procedure when the port 2 of gyro and gain CH of the
receiver are connected. (or with S.BUS connection)
1
Run the car in the gyro off (gyro gain 0%) and adjust
the steering trim (sub trim).
2
Select the appropriate setting for the steering servo that
you are using. Servo selection switch of GYD470 should
be moved to SR mode ON or OFF.
*Do not use a normal digital servo in the SR servo mode (ON). The
servo may be damaged. Use a normal digital servo in the SR servo
mode (OFF).
3
Turn on your transmitter's power. Set the gyro
sensitivity to about 70% at the NORMAL or AVCS side
in accordance with the transmitter instruction manual. The
<GAIN CH><AVCS / NORMAL Modes> graph of the next
page is referred to.
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
*Make the gain tuning adjustment after running the car and noting
the behavior.
4
Receiver ON → The GYD470 requires 3-5 seconds to
initialize when the power is turned on. Do not move
the car and do not move the steering wheel during this
initialization or the gyro may not initialize properly. Once
the initialization process has been completed the steering
servo will move (a little) several times indicating that the
GYD470 is now ready for use. If the neutral has shifted, LED
will blink orange. In that case, it reboots.
5
Move the steering wheel to the left and right and
perform adjustment at the limit trimmer so that the
servo operation is maximum without any bind of the
control linkage or mechanical limits.
＜Limit Trimmer Adjustments＞
Steering wheel to
It adjusts to the
Limit trimmer
full
maximum operation of
Adjustments
linkage.
D/R (UP side)
*Limit is symmetrical from the neutral
position. Only proceed with the limit
adjustment after completing the trim
adjustment.
● Trimmer operation
*Since this gyro is also very small, the adjustment trimmer is also a small
part. Always operate the trimmer with the accessory mini screwdriver
and without applying unreasonable force.
Adjustments
Adjustments
.
6
Using the gyro direction switch, adjust the gyro
operating direction so that steering moves all the way
to the right when the car is turned to the left. Be sure to set
gyro operating direction correctly or the car will not run.
If the car is turned to the left
by hand → steering goes out
on the right
[ When remote gain function is off ]
Adjust the gyro sensitivity with the GYD470 trimmer.
If the port 2 of gyro is not connected, remote gain is automatically
set to being inhibited. (S.BUS connection is excluded)
In this case, the limit trimmer is automatically changed to gyro
sensitivity setting trimmer.
and left.)
1
Select the appropriate setting for the steering servo that
you are using. Servo selection switch of GYD470 should
be moved to SR mode ON or OFF.
*Do not use a normal digital servo in the SR servo mode (ON). The servo
may be damaged. Use a normal digital servo in the SR servo mode
(OFF).
2
Gain trimmer halfway to the left : NOMAL(green) or
right : AVCS (red) from the 70% point.
AVCS 70%
0%
NOMAL 70%
3
Receiver ON → The GYD470 requires 3-5 seconds to
initialize when the power is turned on. Do not move
the car and do not move the steering wheel during this
initialization or the gyro may not initialize properly. Once
the initialization process has been completed the steering
servo will move (a little) several times indicating that the
GYD470 is now ready for use. If the neutral has shifted, LED
will blink orange. In that case, it reboots.
4
Using the gyro direction switch, adjust the gyro's
operating direction so that steering moves all the way
to the right when the car is turned to the left. Be sure to set
the operating direction correctly or the car will not run.
Gyro Sensitivity and mode Switching
Gyro Sensitivity and mode Switching
When the remote gain function is used, NORMAL and AVCS
mode switching is performed in accordance with the direc-
tion 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 adjusting the end point rate.
When the remote gain function is not used, the clockwise
direction from the center of the sensitivity setting trimmer
is the AVCS mode and the counterclockwise direction is the
NORMAL mode. At the center position the sensitivity be-
comes zero and 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.
100%
AVCS side （LED : RED）
Gain
＜ GAIN CH ＞
50%
-110%
-55%
+55%
0%
End point rate
50%
NORMAL side（LED : GREEN）
100%
3CH (GAIN CH) is set up with reference to the manual of a
transmitter. Neutral position becomes GAIN 0%. It is divided
into AVCS side and NORMAL side. Check using the GYD470's
LED.
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
When Port 2 is not used for gain, and SBUS/SBUS2 is not
used, the trimmer works as the gain adjustment shown
below.
AVCS 50%
AVCS 100%
0%
NORM 50%
NORM 100%
Tuning Adjustment
Tuning Adjustment
Actually drive the vehicle and adjust the gyro sensitivity.
1
Always re-trim with the gyro gain at 0.
2
In this state turn the receiver power OFF → ON. The
neutral position is memorized. Steering trim must not
be performed while the car is running.
Hobby Radio Control Business Center Sales & Marketing Department
AVCS / NORMAL Modes
AVCS / NORMAL Modes
The gyro has 2 operating modes: NORMAL mode and AVCS
mode. In the AVCS mode, gyro control is firmer. The car will
hold heading via the drivers commands.
In NORMAL mode the gyro will try to counter steer, but still
allow the car to drift regardless of previous heading.
Because the feel of operation is different, choose your favorite
mode.
AVCS
NORMAL
In case of the right slide
In case of the right slide
⇒Right steering control
⇒Left steering control
The gyro will try to
The gyro will try to get
counter steer regardless
the car to grip in the
of the angle of the car.
drivers steering
direction.
+110%
S.BUS System
S.BUS System
Unlike conventional radio control systems, the S.BUS system
sends operating signals from the receiver to a gyro or other
S.BUS compatible device by data communication. The S.BUS
compatible device executes only those parts of this data for
the channels set by itself. For this reason multiple servos can
be connected to the same signal line.
The S.BUS system requires a dedicated S.BUS receiver and
S.BUS servo (gyro, etc.).
FUTABA CORPORATION
©FUTABA CORPORATION
2023, 4 (3)
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