Adjustments
Running Adjustment
S.BUS System
AVCS / NORMAL Modes
Servo movement when the car is stopped
Servo
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.
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 and adjust the steering trim (sub trim).
2
Select the appropriate setting for the steering servo that you are
using. Servo selection switch of GYC440 should be moved to
digital (DG)
or
analog (AN)
. For best results, use a digital servo and
set the GYC440 at
(DG)
.
*Do not use an analog servo in the digital servo mode
(DG)
. The servo
may be damaged. Use an analog servo in the analog servo mode
(AN)
.
3
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. The <GAIN CH>graph of the next page
is referred to.
※ Make actual sensitivity adjustment while running.
4
Receiver ON → The GYC440 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
GYC440 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 angle
becomes the maximum value at which the servo horn does not strike
the linkage.
Actually drive the vehicle and adjust the gyro sensitivity.
[ When NORMAL mode ]
1
Drive the vehicle and adjust the gyro sensitivity to a position . If
sensitivity is too high, a steering will vibrate. Sensitivity is
lowered so that it may not vibrate.
2
The effectiveness condition of a steering is adjusted by D/R or the
end point of a transmitter.
*When the vehicle is stopped, the maximum steering angle increases
as the gyro sensitivity is increased. This is because a control signal is
applied from the gyro. This is different from the maximum steering
angle when actually running.
[ When AVCS mode ]
*Steering trim must not be performed in the AVCS mode.
(The gyro automatically corrects the neutral position.)
1
Adjust steering trim with 0% gyro sensitivity or the NORMAL side.
2
In this state turn the receiver power OFF → ON. The AVCS side
neutral position is memorized and AVCS can be used. Steering
trim must not be performed while the car is running.
The gyro has 2 operating modes: NORMAL mode and AVCS
mode. In the AVCS mode, the angle is controlled simultaneously
with NORMAL mode rate control (swing speed). The AVCS mode
increases straight running stability more than that of the NOR-
MAL mode. Because the feel of operation is different, choose
your favorite mode.
If steering is performed when the car is stopped, the servo will
move substantially and will operate up to the limit position. In
the AVCS mode, if steering is set to the neutral position, the ser-
vo will slowly return to the neutral position. This is different from
ordinary operation, but is normal.
3CH (GAIN CH) is set up with reference to the manual of a trans-
mitter. A neutral becomes GAIN 0%. It is divided into AVCS side
and NORMAL side. Check using the GYC440's LED.
Trimmer movement when remote gain not used (when S.BUS is
used and port 2 is not connected).
AVCS
NORMAL
Countersteers against
outside force, but cannot
correct the skid direction.
Corrects the skidding
direction and forcefully
maintains the heading.
Outside
force
Outside
force
0%
-50%
+50%
50%
50%
100%
100%
+100%
-100%
End point rate
Gain
NORMAL side（LED : GREEN）
AVCS side（LED : RED）
AVCS 100%
NORMAL 100%
NORMAL 50%
LIMIT
GAIN
0%
AVCS 50%
AN
DG
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 compat-
ible 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.).
A car is shaken at the
left by hand → steering
goes out on the right
＜Limit Trimmer Adjustments＞
It adjusts to the
maximum operation of
linkage.
Steering wheel to
full
D/R (UP side)
Limit trimmer
Adjustments
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
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.
[ When remote gain function is off ]
Adjust the gyro sensitivity with the GYC440 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.
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left.)
1
Select the appropriate setting for the steering servo that you are
using. Servo selection switch of GYC440 is changed
digital
(DG)
or
analog (AN)
. For best results, use a digital servo and set the
GYC440 at
(DG)
.
*Do not use an analog servo in the digital servo mode
(DG)
. The servo
may be damaged. Use an analog servo in the analog servo mode
(AN)
.
2
Gain trimmer halfway to the left from the middle point.
3
Receiver ON → The GYC440 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
GYC440 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.
● Trimmer operation
*Since this gyro is compact and light weight, the adjustment trimmer is also a small
part. Always operate the trimmer with the accessory mini screwdriver and without
applying unreasonable force.
*Limit is symmetricalness from a
trim position. Limit adjustment
after a steering trim adjustment.
LIMIT
GAIN
0%
NORMAL 50%
Gyro Sensitivity and AVCS Switching
When the remote gain function is not used, the clockwise direc-
tion 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 becomes zero and when
the trimmer is turned fully to the left or right, the sensitivity be-
comes 100%.
The sensitivity setting criteria by end point is shown in the figure
below.
＜
GAIN CH
＞
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
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©FUTABA CORPORATION 2016, 2 (2)
When the remote gain function is used, NORMAL 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.
