Futaba Gy470 User manual

Features of GY470Features of GY470

Set ContentsSet Contents Connecting the GY470Connecting the GY470Connecting the GY470 (S.BUS)Connecting the GY470 (S.BUS)Mounting to FuselageMounting to FuselageRudder Servo Linkage CheckRudder Servo Linkage CheckThe following items are supplied with the GY470:

FunctionsFunctions

Mini screwdriver

Sensor tape

Extension Cord: (Black)

Extension Cord: (Red)

Wiring strap

GY470

Monitor LED display

State Color Move Reference

1. GY470 Power ON Orange 2 blinks

2. No servo pulse / Error Red Slow blink

3. Signal input from receiver Green Fast blink

4. Sensor initialization Red/Green ON AVCS (Red)

Normal (Green)

5. Turn Red/Green Fast blink Right (Green)

Left (Red)

6. Neutral offset Orange Slow blink Stick operation

7. Gain off －OFF

8. Switch operation Green One blink Each time of switch

operation

9. Low battery Red One ﬂash Less than 3.8 V

●Remote gain function and mode switching functionYou can adjust gain from the transmitter by using the remote

gain function. Gain can also be adjusted with the trimmer on the

GY470. The mode switching function allows AVCS/NORMAL

gyro mode switching.

●Integrated, compact,and light weightCompact size（20.7x20.7x11mm）and light weight（3.7g）realized by high density mounting technology.

●Easy setupThe GY470 can be used immediately with minimum setup.

●Supporting the S.BUS/S.BUS2 connection Only one wire connection to the receiver can operate the GY470.

INSTRUCTION MANUAL

Rate Gyro for HelicoptersFor RC models●Trimmer

（Limit / Gain）●LED

●Servo Selection Switch ●Port1（Rudder input/S.BUS input）●Port2（Gain input）●Port3（Rudder output）●Gyro Direction

Switch

WARNING

Failure to follow these safety precautions may result in severe injury

to yourself and others.

Always check the transmitter and receiver battery voltage to ensure

they have enough remaining capacity to complete the ﬂight.

The GY470 requires 3-5 seconds to initialize when the power is turned

on. Do not move the helicopter and do not move the rudder stick during

this initialization or the gyro may not initialize properly. Once the initializa-

tion process has been completed the rudder servo will move (a little) sev-

eral times indicating that the GY470 is now ready for ﬂight.

Always ensure that there is some slack in the gyro cables to help

maximize performance. Always use the supplied gyro mounting pads to

attach the gyro to the helicopter mechanics. Do not use a strap that en-

compasses the GY470 sensor. This may affect the overall performance of

the gyro.

If you are switching between NORMAL mode and AVCS mode in ﬂight,

please keep in mind that you must have the gyro re-learn the center posi-

tion after making a trim change within the transmitter. To memorize the

new center position simply ﬂip the gain switch on the transmitter three

times between NORMAL mode and AVCS mode (NORMAL →AVCS →N

ORMAL →AVCS →NORMAL →AVCS) within one second. The servo will

center indicating that the new center position has been memorized.

Be sure to use a digital servo. Use only digital servos with the GY470.

Using the GY470 with an analog servo will damage the servo.

Always check the direction of operation of the servos. If you attempt to

ﬂy the model when a servo operates in the wrong direction, the fuselage

will spin in a ﬁxed direction and enter an extremely dangerous state.

Do not drop the GY470 onto a hard surface or subject the GY470 to a

strong shock as this may damage the sensor.

When using the GY470 in the AVCS mode, set revolution mixing to

OFF.

Do not place gyro near heating equipment (engine, motor, ESC, bat-

tery, servo, etc.). Always allow the gyro to adjust to the surrounding envi-

ronmental temperature before ﬂight. A large temperature change during

use will cause drift and other operational issues. Rudder servo※Only digital servoGyro gain CH(Receiver)←connect→Port2(GY470)Remote gain eﬀective. Trimmer(GY470) becomes LIMIT.Gyro gain CH(Receiver)←It does not connect→Port2(GY470)Remote gain is invalid. Trimmer(GY470) becomes GAIN.Extension Cord:（Black）Extension cord:（Red）GY470Port 3Port 1Rudder CHGyro gain CHPort 2ReceiverS.BUS ReceiverS.BUS CHRudder --- 4CHGyro gain --- 5CHGY470Port 2 is not connected.In S.BUS connection, the port 2 is not connected.

Remote gain is still eﬀective.

S.BUS/S.BUS 2 portRudder servo※Only digital servoExtension cord:（Black）Port 3Port 1Main rotor shaft 90°Gyro mounted to the helicopterGY470Sensor tapeInstall the sensor so that the bottom of the

gyro is perpendicular to the main rotor shaft

axial direction. Offset of this axis will also re-

act in the roll and pitch directions.

As shown in a gure, the direc-

tion which sticks GY470 is free.

•Nopartofthismanualmaybereproducedinanyformwithoutpriorpermission.•Thecontentsofthismanualaresubjecttochangewithoutpriornotice.•Futabaisnotliableforanypotentialdamage(accidentaloroth-erwise)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.

Thank you for purchasing a GY470

gyro, a rate gyro for RC helicopters.

GY470 is a lightweight micro gyro

developed for RC helicopter rudder

(yaw axis) control. It can be used with

mininum setup and includes an S.BUS/

S.BUS2 port.

GY470 Ratings:(Integrated sensor type rate gyro)

• Gyro sensor: MEMS vibrating structure gyro

• Operating voltage: DC4.0 V to 8.4 V

• Current drain: 30 mA (excluding a servo)

• Operating temperature range: -10 ºC to +45 ºC

• Dimensions: 20.7 x 20.7 x 11.0 mm (except protrusion)

• Weight: 3.7 g

• Functions: Sensitivity trimmer. LED monitor. Servo selection (1520 uS,

760 uS). S.BUS/S.BUS2 connection.

*Oil on the sensor bottom and the part in-

stalled to the frame can be wiped off with

cleaner, etc.

GY470 installation precautions

· Always use the accessory sensor tape to install the GY470. Install the GY470 the center of the sensor tape.· Depending on the vibration from the heli-copter, the sponge may tear near the cor-ners of the sensor tape. If the helicopter is flown in this state, vibrations will not be su󱐰ciently absorbed and the sensor may fall o󱐯. Before ight, always check the sen-sor installation state. If the sponge is torn, replace it.Make the initial linkage connections in the NORMAL mode. In this case, make adjustments mechanically and make mini-mum trimmer adjustments at the transmitter.In the NORMAL mode, make the following linkage checks:·In the rudder neutral position, connect the linkage at the position at

which the servo horn and control wire are perpendicular.

Perpendicular

Control wire

Set the servo horn length based on

the helicopter manufacturer's instruc-

tions.

Move the rudder stick to the right and left and check the di-rection of operation of the tail rotor. If the tail rotor turns in the wrong direction, reverse the direction with the transmitter reverse function.1M23N38402

AdjustmentsAdjustments Flight AdjustmentsFlight Adjustments

AVCS / NORMAL ModeAVCS / NORMAL Mode

●A trimmer's operation＊Since the trimmer is small and delicate, operate it by

gently using the provided mini screwdriver.

Setup before a ight [ Remote gain use ]

Adjusting gain with the transmitter.

When S.BUS connection or the gyro gain CH of the port 2 of a

gyro and a receiver is connected.

1. Settheservoselectionswitchtothesettingforyourtailrotorservo.Seechartbelow.2. Setupyourtransmitterbyfollowingthedirectionsinthegyrosettingmenumanual.Gyrogainissetupto50%byAVCS.Pleaserefertothegraph,AVCS,NORMALorwhenunclear.ItjudgesbytheLEDontheGY470.AVCS:RedNORMAL:Green3. ReceiverON→TheGY470requires3-5secondstoinitializewhenthepoweristurnedon.Donotmovethehelicopteranddonotmovetherudderstickduringthisinitializationorthegyromaynotinitializeproperly.Oncetheinitializationprocesshasbeencompletedtherudderservowillmove(alittle)severaltimesindicatingthattheGY470isnowreadyforight.Iftheneutralhasshifted,LEDwillblinkorange.Inthatcase,itreboots.4.Movetheruddersticktotheleftandrightandmakeadjustmentswiththelimittrimmer.Adjustformaximumtravel,makingsuretheservohorndoesn'thitthelinkage. [ Remote gain not use ]

Adjusting gain with the GY470 trimmer.

When not using an S.BUS connection and port 2 is not connected. In this case, a limit trimmer is automatically changed by the gyro

gain setting trimmer. A limit is xed by 50 degrees of right and

left. Adjustthetransmitterandgyrowhilerepeatedlytakingo󱐯andlandingandwiththeaircraftontheground.Transmitter adjustments must not be made while ying

because it is dangerous.

1. Setthesensitivitytothepositionatwhichhuntingdoesnotoccurduringhoveringandight.2. Adjustthehoveringandflightruddereffectusingthetransmitter'sD/RorAFRfunction.* Do not adjust with the End Point (ATV) function. If the End Point (ATV)

function is used, trimming may change.

AVCS 100%NORM 100%NORM 50%0%AVCS 50%＜A gain trimmer's work ＞Operation in AVCS mode

If the rudder stick is operated or the helicopter is moved when the

helicopter was stopped during operation in the AVCS mode, the servo

will not return to the neutral position even if the rudder stick is re-

turned to the neutral position, and when the rudder stick is moved, the

rudder servo controls operation until the tail reaches the maximum

point. This is caused by addition of an integration function as an

AVCS mode operation and is not an abnormality. In actual ight, the

gyro constantly monitors movement of the tail and controls the servo

so that movement of the tail is stopped.

AVCS mode servo neutral position check method;

If the rudder stick or the helicopter was moved in the AVCS mode, the servo

will not return to its original neutral position. When the power is turned on,

the servo will return to the neutral position. The servo neutral position can

also be checked by the following method.

Neutral

position

Move the rudder stick 3 times to its full stroke to the left

and check method right at an internal of within 1 second

and immediately return the rudder stick to the neutral

position. The servo moves to the neutral position about 1

second later.

NORMAL mode sends control signals to the rudder servo only

when the tail of the helicopter moves. When the tail stops mov-

ing, the control signal from the gyro becomes zero. Conversely,

the AVCS mode continues to send control signals to the servo

even when the tail of the helicopter stops moving. The following

sequentially describes the NORMAL mode and the AVCS mode.

Operation of NORMAL mode

Basic operation is described by considering the case when the

helicopter is hovering under cross-wind conditions. With a nor-

mal mode, when the helicopter encounters a cross-wind, the

force of the cross-wind causes the tail of the helicopter to drift.

When the tail drifts, the gyro generates a control signal that stops

the drift. When the tail stops drifting, the control signal from the

gyro becomes zero. If the cross-wind continues to cause the tail

to drift in this state, the "stop" operation is repeated until the tail

faces into the winds. This is called the "weathervane" effect.

Operation of AVCS mode

Conversely, with an AVCS mode, when the helicopter encoun-

ters a cross-wind and the tail drifts, a control signal from the gyro

stops the drift. At the same time, the gyro computes the drift an-

gle and constantly outputs a control signal that resists the cross-

wind. Therefore, drifting of the tail can be stopped even if the

cross-wind continues to effect the helicopter. In other words, the

gyro itself automatically corrects(auto trim) changes in helicopter

tail trim by cross-wind. Considering operation of an AVCS mode,

when the tail of the helicopter rotates, the servo also rotates in

accordance with the angle of rotation of the tail. When the tail

stops rotating, the servo judges that it has stopped in that posi-

tion. This is the auto trim function. In AVCS operation modeIn NORMAL operation modeHovering in a cross wind. The tail will drift.AVCS is working properly during a cross wind.If it starts right driftIf it starts right driftA head turns to a direction of movement automatically.If no left rudder input is given, the machine will drift to the right. CrosswindCrosswind

HoveringHigh-speed ﬂight

Please take a look at both the directions for the helicopter as well

as the transmitter.

Hold the rudder stick full left.Adjust the left limit with the trim.Hold the rudder stick full right.Adjust the right limit with the trim.Adjust the linkage set up to get the maximum throw.Adjust the linkage set up to get the maximum throw.Bottom view of the tail section with the rudder stick full left.Bottom view of the tail section with the rudder stick full right.【Adjustment at the limit trimmer】

LIMIT

GAIN

LIMIT

GAIN

【Preﬂight check】Helicopter is turned to the Left ⇒Rudder operates on the

Right.

*This check is performed in the state where an engine (motor)

never starting.

5. IftherudderservomovestotheRightwhenthenoseofthehelicoptermovestotheLeft,thegyrodirectioniscorrect.IftherudderservomovestotheLeft,switchthedirectionusingtheGyro Direction Switch.If you try to fly the helicopter while the gyro direction is incorrect,

when the rotor rotates clockwise, the helicopter nose will yaw to the

Left and cause an extremely dangerous situation.

2.First,wesuggesttostartwithAVCSsetto50%.What is S.BUS?

Unlike conventional radio systems, the S.BUS system uses

data communication to transmit control signals from a

receiver to a servo, gyro, or other S.BUS compatible device.

This data includes commands such as “move the channel 3

servo to 15 degrees, move the channel 5 servo to 30 degrees”

to multiple devices. The S.BUS devices execute only those

commands for their own set channel. For this reason, it can

be used by connecting multiple servos to the same signal

line.

* Set the channel at the S.BUS servos by using an SBC-1 channel changer or a CIU-2 USB serial interface.

* Can also be used together with conventional servos. However, conventional servos cannot be used by the S.BUS output.

* When using servos with a remote battery pack, use S.BUS Hub with Cable (2-way/remote battery pack use).

Please refer to the instruction manual of S.BUS Hub with Cable (2-way/remote battery pack use) for the connection method.

Please turn on the power supply of the transmitter rst without fail, and, next, turn on the receiver if you use S.BUS. Moreover, please use it

after it conrms the operation without fail. Otherwise, the S.BUS communication cannot be judged and it is likely to malfunction.

The wiring for the S. BUS servo is replaced at power supply OFF. If you replace the wiring in power supply ON, S. BUS communications

cannot be judged, and it seems to malfunction.

1. Similarlytheprocedureof1. 3. 5 isfollowed.1520uS:BLS274SV,BLS254,BLS257,S9254,S9257,etc.760uS:BLS276SV,BLS256HV,BLS251,S9256,S9251FUTABA CORPORATION

Hobby Radio Control Business Center Sales & Marketing Department

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