FUTABA GYD450 User manual

WARNING
Failure to follow these safety precautions may result in severe injury to
yourself and others.
Check that there is sufficient battery capacity.
Do not operate the model and transmitter steering wheel
for about 3-5 seconds after turning on the GYD450 (When
shared with the receiver).
• GYD450 initialization and neutral position reading. The GYD450 is initialized when the
power is turned on. The neutral position is also read at the same time. If initialization
ends normally, the operator is informed by two repetitive movements of the servo to
the left and right (a little).
Always check the direction of operation of the gyro.
Do not strike the gyro with a hard object. Do not drop it onto
a concrete surface or other hard floor.
• The sensor may become damaged during strong impacts.
Do not use trims or mixing.
• All corrections are made by the gyro. Therefore, if trimming and mixing, are turned on,
operation will be the same as deviating from the neutral position.
Do not use the GYD450 for applications other than RC cars.
•This gyro is designed for RC cars only. Do not use it for other applications.
Analog servos cannot be used.
•The use of analog servos may cause servo trouble.
Do not place gyro near heating equipment (engine, motor,
ESC, battery, servo, etc.).
• Always allow the gyro to adjust to the surrounding environmental temperature before
ight. A large temperature change during use will cause drift and other operational
issues.
Connecting the GYD450 S.BUS Connecting the GYD450
Mounting to Chassis
Steering servo SR mode
Rate Gyro
for RC Drift Cars
INSTRUCTION MANUAL
INSTRUCTION MANUAL
Only for Futaba digital servo
For RC models
Gyro
Included sponge
sensor tape
Degrease
and stick Horizontal plane
Flat surface of the chassis where the sensor
tape sticks easily. Mount the gyro level so
that it is not tilted relative to the chassis.
Use the included double-sided sponge tape to rmly at-
tach the gyro perpendicular to the control axis, at a posi-
tion where there is as little vibration as possible. Make the
Gyro mounting position
The direction of rotation fixed by the gyro can be any
direction within 360° relative to the steering axis controlled
by the gyro.
•Nopartofthismanualmaybereproducedinanyformwithoutpriorpermis-
sion.
•Thecontentsofthismanualaresubjecttochangewithoutpriornotice.
•Futabaisnotliableforanypotentialdamage(accidentalorotherwise)that
mayoccurafterinstallation.
Before using your new gyro, please read this manual thoroughly and
use the gyro properly and safely. After reading this manual, store it in
a safe place.
● Dedicated RC Drift car setting
Vehicle straight-line and cornering performance can be increased without
taking into account the effect of the road surface, etc.
● Remote gain function and mode switching function
You can adjust gain from the transmitter (3 or more CH) by using the
remote gain function. Gain can also be adjusted with the trimmer on the
GYD450. The mode switching function allows AVCS/NORMAL gyro mode
switching.
● Integrated, compact, and light weight
Compact size（20.5x20.5x11mm）and light weight（3.7g）realized by
high density mounting technology.
● Easy setup
The GYD450 can be used immediately with minimum setup.
● Supporting the S.BUS/S.BUS2 connection
Only one wire connection to the receiver can operate the GYD450.
● Only for Futaba digital servo
GYD450 Ratings:
(Integrated sensor type rate gyro)
• Gyro sensor: MEMS vibrating structure gyro
• Operating voltage: DC4.2V to 8.4V
• Current drain: 30mA (excluding a servo)
• Operating temperature range: -10ºC to +45ºC
• Dimensions: 20.5 x 20.5 x 11.0mm (except protrusion)
• Weight: 3.7g
• Functions: Sensitivity trimmer. LED monitor. Servo selection (SR mode
ON/OFF). S.BUS/S.BUS2 connection.
Features of GYD450
Functions
Monitor LED display
State Color Move Reference
1. No servo pulse / sensor
error Red 2 flash
2. Warm-up Green Fast blink
3. Sensor initialization Red/Green ON AVCS (Red)
NORMAL (Green)
4. Turn Red/Green Fast blink Right (Green)
Left (Red)
5. Neutral offset Orange Slow blink Stick operation
6. Gain OFF －OFF
7. Switch operation Green One blink Each time of switch
operation
8. Low battery Red One flash Less than 4.0V
●Trimmer
（Limit/Gain）●LED
●Servo selection switch
(SR mode ON/OFF) ●Port1（Steering input/
S.BUS input）
●Port2（Gain input）
●Port3（Steering servo output）
●Gyro direction
Switch
Set Contents
The following items are supplied with the GYD450:
Mini screwdriver
Sensor tape
Extension cord
Nylon strap
GYD450
1M23N33302
Thank you for purchasing the
GYD450 RC cars gyro. Compact
and lightweight, the GYD450 is
designed to control steering for RC
Drift cars. If the transmitter has 3
or more channels (capable of 3CH
adjustment) the gyro sensitivity can
be adjusted from the transmitter.
Features include simple set-up and
S.BUS/S.BUS2 connectivity.
S.BUS/S.BUS2 port
GYD450 GYD450
S.BUS Receiver
Steering servo Steering servo
Steering CH1
Gyro gain CH3
Receiver
Gyro gain CH(Receiver)←connect→Port2(GYD450)
Remote gain effective. Trimmer(GYD450) becomes LIMIT.
Gyro gain CH(Receiver)←It does not connect→Port2(GYD450)
Remote gain is invalid. Trimmer(GYD450) becomes GAIN.
S.BUS CH
Steering --- 1CH
Gyro gain --- 3CH
Extension cord
In S.BUS
connection, the
port 2 is not
connected.
Remote gain is still
effective.
wiring loose and bundle it with the included nylon strap so
that it will not interfere with the rod.
Link the servo in accordance with the kit instruction man-
ual. Adjust the linkage rod so that the trim amount is as
small as possible.
When using S.BUS servo, initialize a parameter.
Make the servo operating range as wide as possible.
Make the numerical value of EPA (ATV) equally in left and
right.
It is possible when using the T7PX to change the servo to
"SR Mode" and improve the servo response. If the servo
can't be changed to SR mode, do not set the TX to SR
mode.

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)
1Run the car in the gyro off (gyro gain 0%) and adjust the steering trim (sub trim).
2Select 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).
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.
*Makethegaintuningadjustmentafterrunningthecarandnoting
thebehavior.
4Receiver 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.
5Move 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.
1Always re-trim with the gyro gain at 0.
2In 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 rmer. 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 di󱐯erent, 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.
0%
-50%
+50%
50%
50%
100%
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
6Using 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.
(Limit adjustment cannot be performed. A limit is xed to 50 right
and left.)
1Select 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).
2Gain trimmer halfway to the left : NOMAL(green) or
right : AVCS (red) from the 70% point.
3Receiver 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.
4Using 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
gure below.
＜GAIN CH ＞
Gyro sensitivity zero --- LED OFF
AVCS side --- LED red
NORMAL side --- LED green
FUTABA CORPORATION
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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.
0%
NOMAL 70%
AVCS 70% AVCS 100%
NORM 50% NORM 100%
0%
AVCS 50%