FUTABA GY440 User manual

Features of GY440 Set Contents
ConnectingtheGY440
ConnectingtheGY440(S.BUS)
MountingtoFuselage
RudderServoLinkageCheck
The following items are supplied with the GY440:
Functions
Mini screwdriver
Sensor tape
Extension Cord: (Black)
Extension Cord: (Red)
Wiring strap
GY440
Monitor LED display
State Color Move Reference
1. No servo pulse /
sensor error Red Slow blink
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 3.8V
● Remotegainfunctionandmodeswitchingfunction
You can adjust gain from the transmitter by using the remote gain
function. Gain can also be adjusted with the trimmer on the GY440.
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 GY440 can be used immediately with minimum setup.
● SupportingtheS.BUS/S.BUS2connection
Only one wire connection to the receiver can operate the GY440.
I NSTRUCTION M ANUAL
I NSTRUCTION M ANUAL
RateGyroforHelicopters
For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 GY440 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 GY440 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 GY440 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 GY440.
Using the GY440 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 GY440 onto a hard surface or subject the GY440 to a
strong shock as this may damage the sensor.
When using the GY440 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servo
GyrogainCH(Receiver)←connect→Port2(GY440)
Remotegaineffective.Trimmer(GY440)becomesLIMIT.
GyrogainCH(Receiver)←Itdoesnotconnect→Port2(GY440)
Remotegainisinvalid.Trimmer(GY440)becomesGAIN.
ExtensionCord:（Black）
Extensioncord:（Red） GY440
Port3
Port1
RudderCH
GyrogainCH
Port2
Receiver
S.BUSReceiver
S.BUSCH
Rudder---4CH
Gyrogain---5CH
GY440
Port2isnotconnected.
InS.BUSconnection,theport2
isnotconnected.
Remotegainisstilleffective.
S.BUS/S.BUS2port
Rudderservo
※Onlydigitalservo
Extensioncord:（Black）
Port3
Port1
Mainrotorshaft
90°
Gyromountedtothehelicopter
GY440
Sensortape
LIMIT
GAIN
LIMIT GAIN
Install 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.
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tion which sticks GY440 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 GY440
gyro, a rate gyro for RC helicopters.
GY440 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.
GY440Ratings:
(Integrated sensor type rate gyro)
•Gyro sensor: MEMS vibrating structure gyro
•Operating voltage: DC4.0V 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
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*Oil on the sensor bottom and the part in-
stalled to the frame can be wiped off with
cleaner, etc.
GY440 installation precautions
·Alwaysusetheaccessorysensortapeto
installtheGY440.InstalltheGY440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
sufficientlyabsorbedandthesensormay
falloff.Beforeflight,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:
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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.
1M23N30602

Adjustments Flight Adjustments
AVCS / NORMAL Mode
● Atrimmer'soperation
＊Since the trimmer is small and delicate, operate
it by gently using the provided mini screwdriver.
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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.
1Settheservoselectionswitchtothesettingforyourtailrotor
servo.Seechartbelow.
2Setupyourtransmitterbyfollowingthedirectionsinthe
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GY440.AVCS:RedNORMAL:Green
3ReceiverON → TheGY440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GY440isnowreadyforflight.
Iftheneutralhasshifted,LEDwillblinkorange.Inthatcase,it
reboots.
4Move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.
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Adjusting gain with the GY440 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
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left.
Adjustthetransmitterandgyrowhilerepeatedlytakingoffand
landingandwiththeaircraftontheground.
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because it is dangerous.
1Setthesensitivitytothepositionatwhichhuntingdoesnot
occurduringhoveringandflight.
2Adjust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)
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AVCS100%
NORMAL100%NORMAL50%
LIMIT
GAIN
0%
AVCS50%
＜A gain trimmer's work ＞
＜GAIN CH ＞
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
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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.
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helicopter is hovering under cross-wind conditions. With a nor-
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force of the cross-wind causes the tail of the helicopter to drift.
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gyro becomes zero. If the cross-wind continues to cause the tail
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Operation of AVCS mode
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gle and constantly outputs a control signal that resists the cross-
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gyro itself automatically corrects(auto trim) changes in helicopter
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accordance with the angle of rotation of the tail. When the tail
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tion. This is the auto trim function.
InAVCSoperation
mode
InNORMALoperation
mode
Hoveringinacrosswind.
Thetailwilldrift.
AVCSisworking
properlyduring
acrosswind.
Ifitstartsrightdrift Ifitstartsrightdrift
Aheadturnstoa
directionofmovement
automatically.
Ifnoleftrudderinput
isgiven,themachine
willdrifttotheright.
Cross
wind Cross wind
Hovering High-speedflight
0%
-50%
+50%
50%
50%
100%
100%
+100%
-100%
Endpointrate
Gain
NORMALside（LED:GREEN）
AVCSside（LED:RED）
Please take a look at both the directions for the helicopter as well
as the transmitter.
LIMIT
GAIN LIMIT GAIN
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】
【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.
5If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.
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Left and cause an extremely dangerous situation.
First,wesuggesttostartwithAVCSsetto50%.
FUTABA CORPORATION
1080 Yabutsuka, Chosei-mura, Chosei-gun, Chiba-ken, 299-4395, Japan
Phone: [phone], Facsimile: [phone]
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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.
* &DQDOVREHXVHGWRJHWKHUZLWKFRQYHQWLRQDOVHUYRV+RZHYHUFRQYHQWLRQDOVHUYRVFDQQRWEHXVHGE\WKHS.BUS output.
* :KHQXVLQJVHUYRVZLWKDUHPRWHEDWWHU\SDFNXVHS.BUS+XEZLWK&DEOHZD\UHPRWHEDWWHU\SDFNXVH
Please refer to the instruction manual of S.BUS+XEZLWK&DEOHZD\UHPRWHEDWWHU\SDFNXVHIRUWKHFRQQHFWLRQPHWKRG
3OHDVHWXUQRQWKHSRZHUVXSSO\RIWKHWUDQVPLWWHU¿UVWZLWKRXWIDLODQGQH[WWXUQRQWKHUHFHLYHULI\RXXVHS.BUS0RUHRYHUSOHDVHXVHLW
DIWHULWFRQ¿UPVWKHRSHUDWLRQZLWKRXWIDLO2WKHUZLVHWKHS.BUS communication cannot be judged and it is likely to malfunction.
The wiring for the S. BUSVHUYRLVUHSODFHGDWSRZHUVXSSO\2)),I\RXUHSODFHWKHZLULQJLQSRZHUVXSSO\21S. BUS communications
FDQQRWEHMXGJHGDQGLWVHHPVWRPDOIXQFWLRQ
Similarlytheprocedureof1.3.7isfollowed.
LIMIT
GAIN
1520uS:BLS254,BLS257,S9254,S9257,etc.
760uS:BLS256HV,BLS251,S9256,S9251