Manual Futaba GYD450 (page 2 of 2) (English)

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Adjustments

Tuning Adjustment

S.BUS System

AVCS / NORMAL Modes

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)

Run the car in the gyro off (gyro gain 0%) and adjust

the steering trim (sub trim).

Select the appropriate setting for the steering servo that

you are using. Servo selection switch of GYD450 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).

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.

*Make the gain tuning adjustment after running the car and noting

the behavior.

Receiver ON → The GYD450 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

GYD450 is now ready for use. If the neutral has shifted, LED

will blink orange. In that case, it reboots.

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.

Actually drive the vehicle and adjust the gyro sensitivity.

Always re-trim with the gyro gain at 0.

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.

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.

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 GYD450's

LED.

When Port 2 is not used for gain, and SBUS/SBUS2 is not

used, the trimmer works as the gain adjustment shown

below.

In case of the right slide

⇒Left steering control

In case of the right slide

⇒Right steering control

AVCS NORMAL

The gyro will try to get

the car to grip in the

drivers steering

direction.

The gyro will try to

counter steer regardless

of the angle of the car.

-50%

+50%

50%

100%

+110%

-110%

End point rate

Gain

NORMAL side（LED : GREEN）

AVCS side（LED : RED）

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.).

If the car is turned to 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

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 GYD450 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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and left.)

Select the appropriate setting for the steering servo that

you are using. Servo selection switch of GYD450 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).

Gain trimmer halfway to the left : NOMAL(green) or

right : AVCS (red) from the 70% point.

Receiver ON → The GYD450 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

GYD450 is now ready for use. If the neutral has shifted, LED

will blink orange. In that case, it reboots.

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 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.

*Limit is symmetrical from the neutral

position. Only proceed with the limit

adjustment after completing the trim

adjustment.

Gyro Sensitivity and mode Switching

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.

＜

GAIN CH

＞

Gyro sensitivity zero --- LED OFF

AVCS side --- LED red

NORMAL side --- LED green

FUTABA CORPORATION

Makuhari Techno-Garden Bldg. B-6F, 1-3 Nakase, Mihama-ku, Chiba, 261-8555, Japan

Phone: +81-43-296-8259, Facsimile: +81-43-296-8253

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.

NOMAL 70%

AVCS 70%

AVCS 100%

NORM 50% NORM 100%

AVCS 50%

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Futaba GYD450 Manual

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