Futaba GY701 User Manual

INSTRUCTION MANUAL

1M23N23906

TABLE OF CONTENTS

• Precautions ----------------------------------	3
• Warranty and Repair Service (in U.S.A.)--	8
• Introduction ---------------------------------	9
• Features--------------------------------------	9
• Contents -----------------------------------	11
• Specifications -----------------------------	14
• Recommended Servos -------------------	15
• Replacement and Optional Items-------	15
• Connecting the GY701 to your Receiver 16
• LED Indicator Description--------------	19
• Mechanics Preparation-------------------	20
• Opening Screen---------------------------	22
• Home Screen------------------------------	23
• Warning Display--------------------------	28
• Edit Screen --------------------------------	30
• Gyro Basic Setting -----------------------	32
• Gyro Sensor Installation-----------------	34
• Tail Rotor Servo Installation and Setup--	35
• Before Flight Checklist------------------	38
• Adjustments During the Test Flight----	39
• Using Normal Mode ---------------------	41
• Setting the Gain---------------------------	42
• Governor Basic Setting------------------	44
• Mounting the Magnet and Sensor------	52
• Fuselage Setting Precautions -----------	56
• Governor Operation----------------------	58
• Governor Speed Setting -----------------	60
• S.BUS Basic Setting ---------------------	62
• Gyro Expert Setting----------------------	65
• Governor Expert Setting-----------------	74

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TABLE OF CONTENTS

Gyro

Governor

:Instructions for gyro function

:Instructions for governor function

Technical updates and additional programming examples can be found at:

www.futaba-rc.com/faq

PRECAUTIONS

Meaning of Special Markings

Pay special attention to safety where indicated by the following marks:

DANGER - Procedures which may lead to dangerous conditions and cause death/serious injury if not carried out properly.

WARNING - Procedures which may lead to a dangerous condition or cause death or serious injury to the user if not carried out properly, or procedures where the probability of superficial injury or physical damage is high.

CAUTION - Procedures where the possibility of serious injury to the user is small, but there is a danger of injury, or physical damage, if not carried out properly.

: Prohibited : Mandatory

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PRECAUTIONS

WARNING

Failure to follow these safety precautions may result in severe injury to yourself and others.

ss2EAD THROUGHOTHEHENTIRE MANUALABEFOREROPERATing this product.

BEFORE EACH FLIGHT:

Always check the transmitter and receiver battery voltage to ensure they have enough remaining capacity to complete the flight.

Always exit programming mode before attempting to fly the model.

Only use the GY701 with a 2.4GHz system such as the Futaba FASST system, or a PCM system. Use with a FM system is strongly discouraged since interference can cause serious operational problems.

Gyro operating precautions: Gyro

The GY701 requires 5-10 seconds to initialize when the power is turned on. Do not move the helicopter and do not move the tail rotor stick during this initialization or the gyro may not initialize properly. Once the initialization process is complete, the tail rotor servo will move to the left extent and then to the right extent. This will occur twice. The indicator light will change to solid red for AVCS Mode or solid blue for Normal Mode.

Verify that the gyro is operating correctly.

Verify that the gyro compensates in the correct direction before flight. If the compensation direction is incorrect the model will pirouette uncontrollably, at a very high rate.

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PRECAUTIONS

Verify that the gyro is operating in the desired mode.

Verify that the gyro mounting pads are in good condition.

Verify that the gyro wires are not contacting the frame of the helicopter.

The servo type parameter within the GY701 must match the type of servo you are using. Incorrect setting may damage the GY701 or the servo, possibly resulting in a loss of control during 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 encompasses the GY701 sensor. This may affect the overall performance of the gyro.

Always allow the gyro to adjust to the surrounding environmental temperature before flight. A large temperature change during use will cause drift and other operational issues.

The GY701 sensor uses a high strength aluminum die cast case. Do not allow anything to touch the gyro case as it may cause a short circuit.

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 position 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 Normal AVCS) within one second. The tail rotor servo will center indicating that the new center position has been memorized.

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PRECAUTIONS

When operating the gyro in AVCS Mode, all tail rotor compensation and revolution mixing must be disabled and any tail rotor offsets for flight modes must be disabled.

When the GY701 is operated in AVCS mode the tail rotor servo will not center when the stick is released. This is normal operation for AVCS mode. The servo may also move to the extent while the model is being carried out to the flight line. Before take off, you must center the tail rotor servo by moving the tail rotor stick full left, then full right, back to full left and then allow the stick to center within one second. You can also visually center the tail rotor pitch slider by using the tail rotor stick.

Do not drop the GY701 sensor onto a hard surface or subject the GY701 sensor to a strong shock as this may damage the sensor.

Always use the supplied mounting pads or the Futaba replacement mounting pads available from your local hobby dealer.

Governor operating precautions: Governor

Always set battery fail safe function at the GY701. Since the GY701, when used, controls the throttle, the battery fail safe function that is in a receiver will not be used.

Throttle fail safe function (transmitter setting): Use the fail safe function for the channel that turns the governor on and off to set the fail safe position to the point at which the governor is turned off. With this setting, when the system enters the fail safe state, the governor will be turned off and the receiver throttle signal (fail safe position preset) will be output directly.

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PRECAUTIONS

When using the condition hold function, transmitter’s function), always set the throttle servo maximum operating point to less than the point at which the governor is turned on. Depending on the conditions, this setting will turn on the governor and prevent the engine from exceeding the set speed even when condition hold is set.

At the beginning of flight, keep the governor in the off state by setting the throttle stick to maximum slow side.

When the model is on the ground, lower the pitch to the position at which the model does not try to lift off. Do not take your eyes off the model. When the governor operates and the rotor speed increases the lift also increases causing the model to try lift off , depending on the pitch position.

Check the sensor output not only when installing the sensor but periodically. Since the magnet rotates at high speed, it is subjected to a large centrifugal force. Check the magnet output and mounting state after about every 10 flights.

If the model begins to shake during operation, immediately turn off the governor. The carburetor design, etc. may cause the engine to operate unstable. If this occurs, lower the maximum speed setting to the range over which there is no problem.

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WARRANTY & REPAIR SERVICE (IN U.S.A.)

If any difficulties are encountered while setting up or operating your GY701, please consult the instruction manual first. For further assistance you may also refer to your hobby dealer, or contact the Futaba Service Center at the web site, fax or telephone number listed below:

www.futaba-rc.com or www.hobbyservices.com Fax [phone], Tel [phone]

If you are unable to resolve the issue, pack the system in its original container with a note enclosed and a thorough, accurate description of the difficulty. Include the following in your note:

ss3YMPTOMS INCLUDING WHEN THE PROBLEMEOCCURRED C

ss3YSTEM 4RANSMITTER 2ECEIVER 3ERVOS ANDNMODELD numbers)

ss-ODELO -ODEL NAME ss-ODELONUMBERS AND QUANTITYD

ss9OURU.AME !DDRESSDANDE4ELEPHONE NUMBERB

Send the respective items to the authorized Futaba Service Center Address below:

Futaba Service Center

3002 N Apollo Drive Suite 1

Champaign, IL 61822

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INTRODUCTION

The Futaba© GY701 is combined heading hold AVCS gyro and head speed governor in one box. Its cutting-edge MEMS (Micro Electro Mechanical System) sensor design, ultra high-speed processing speed and advanced PID control algorithm put it a quantum leap ahead of all other heading hold gyros in size, weight and performance. The GY701 has been optimized to work for model helicopter competition.

FEATURES

•Combined Gyro and Governor in one box. Individual either Gyro or Governor working mode are supported.

•The fastest operation scheme is utilized both the Gyro and Governor section.

•Low profile, small size and lighter weight.

•Small size of the combined one box gyro and governor controller, 44 x 29 x 12mm, 13 g

•Using the 128 x 36 dots graphical white color OLED (Organic Light Emitting Display), high brightness and contrast.

•Easy setting divided by Basic and Expert editing menu. The basic setting is for initial setting and Expert setting is for precise setting.

•Firmware can be updated from PC through CIU-2.

•Supporting the S.Bus connection. Only one wire connection to the receiver can operate the GY701.

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FEATURES

•Gyro section

•Advanced and adaptive PID operation is utilized

•Small and low profile gyro sensor. 2 colors LED are installed on the top surface. Using the Aluminum Alloy metal case. 21 x 21 x 8mm, 14.5 g

•Wide operation dynamic ranges up to +/- 1,200 deg/sec.

•3 kinds of servo type are supported

•3D and F3C operation mode is selectable

•The Feed forward operation is utilized. Pitch signal can be added to the gyro operation. (F/F mixing, only S.BUS connection)

•New operation algorithm achieves the more consistent pirouette and smooth Yaw control .

•Governor section

•Advanced and adaptive PID operation is utilized •Fastest operation.

•Wider revolution control ranges, 1000 rpm-3000 rpm

•Both digital and analog servo can be selected •Revolution compensation by Yaw rate is installed •Governor or Rev. Limit mode selectable

•New operation algorism achieves more faster and smooth revolution control .

•Back plate sensor can be selected by the option (for OS-91, OS-55, OS-50)

•Other function

•Maximum revolution memorization

•Engine runtime integration

•OLED power saving

•LED on/off selectable

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CONTENTS

Your GY701 includes the following components:

Type of set

ss'YRO 'OVERNOROSET W ",3 ss'YRO 'OVERNOROSET ss'OVERNOROSET

ss'YRO SET

SET CONTENTS

	GY701 Control Amp
	*Mini Screwdriver		X	X	X	X
	*Dust Covers (x3)
	Gyro Sensor		X	---	X	X
	*Mounting Pads (x3)
	Governor Sensor
	*Sensor Mounting Hardware		---	X	X	X
	*Magnet (x2)
	BLS251 Servo		---	---	---	X
	*Servo horn and mounting parts
	Extensions (Black/Red)		1	1	2	2
	X: supplied	---: not supplied

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CONTENTS

GY701 Control Amp

Dust Cover

Adjustment Screwdriver

Gyro Sensor			Mounting Pads
			2mm Thick (three)

Governor Sensor

Magnet

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CONTENTS

Sensor Mounting Stay

	SENSOR	SENS.	THRO	MXTR
	& Sx
	Tx	r.p.m 1	r.p.m 2	r.p.m 3
		m.trim	GOV on	GOV off
	GV-1	on / off	r.p.m	THRO
		m.trim

BLS251 Servo

Extensions:

Extension (Black)

Extension (Red)

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SPECIFICATIONS

Width (Controller): 1.14in [29mm] (Gyro sensor): 0.83in [21mm] (Speed sensor): 0.30in [7.5mm] Length (Controller): 1.73in [44mm] (Gyro sensor): 0.83in [21mm] (Speed sensor): 0.63in [16mm] Height (Controller): 0.47in [12mm]

(Gyro sensor): 0.31in [8mm] (Speed sensor): 0.39in [10mm] Weight (Controller): 0.459oz [13g] (Gyro sensor): 0.353oz [10g]

(Speed sensor): 0.141oz [4g]

Maximum* Operating Voltage: 3.8V to 8.4V DC Current Drain: 80mA

Selectable Servo Frame: 70Hz, 280Hz and 570Hz(Gyro only) Rate

Center Pulse Width: 1520μS (70Hz & 280Hz Frame Rate)

Flight Mode: User selectable F3C or 3D (Gyro)

Control Resolution: 0.1Hz (6rpm) (Engine speed)

Speed stability accuracy: 1%

Speed Control Range: 1,000-3,000rpm (Rotor speed)

Operating Temperature: 14°F to 113°F (-10°C to +45°C)

Control System: Digital advanced control Sensor: Vibrating structure gyro/

Magnetic sensor (Gyro/Governor)

Angular Velocity Range: ±1,200 Degrees Per Second (Gyro)

*The maximum operating voltage listed only applies to the GY701. Always verify that your receiver, servos, tail rotor servo, switch and any other electronic components used in your installation are capable of operating at the voltage you plan to use.

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RECOMMENDED SERVOS

.91 Size Helicopters

&UTABA 3 $IGITAL 3ERVOO(ELI FUTM0224(Z 3

&UTABA 3 $IGITAL (I 3PEED FUTM0226(Z 3

&UTABA ",3 "RUSHLESSL(ELI 3ERVO FUTM0521(Z 3

REPLACEMENT & OPTIONAL ITEMS

Futaba PC Interface CIU-2: FUTM0951

&3( ('9 %XTENSION %MM FUTM4664 &3( ('9 %XTENSION %MM FUTM4665 &3( ('9 %XTENSION MMX FUTM4666 &3( ('9 %XTENSION MMX FUTM4667 &3( ('9 %XTENSION %MM FUTM4668

&3( ('9 -OUNTING 0AD FUTM4669

2x22x22 mm (10)

&3( ('9 -OUNTING 0AD FUTM4670

X X MM &3( ('9 3HIELD 0LATE FUTM4671

X X MM

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CONNECTING THE GY701 TO YOUR RECEIVER

OLED Display

s $ISPLAYS THE SET DATA AND operation status.

(1)

(2)

(3)-(6)

(7)

(8)

Edit Keys

ss5SED WHEN SETTINGNDATA

ss/PERATED BY PUSHINGHWITH THEH accessory mini screwdriver.

s #ONNECT THE '9 AND THE receiver with the supplied ex-

TENSIONS ; TO =

When using an S.BUS re-

CEIVER TO ARERNOTOCONnected.

s '9 POWER REQUIREMENT

4.8V (from receiver)

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CONNECTING THE GY701 TO YOUR RECEIVER

(1) Gyro: Gyro

ss#ONNECTNTHECGYRO SENSOR

*Insert the sensor connector until it is firmly locked.

(2) Rsen: Governor ss#ONNECTNTHECSPEEDTSENSOR

Receiver

(3) Rin/SB:

ss3 "53 RECEIVER #ONNECTNTO THEH3 "53 OUTput of the receiver.

ss/THERHTHAN 3 "53 RECEIVER #ONNECTNTO THEH rudder channel output. Gyro

(4) Tin: Governor

ss#ONNECTNTO THE THROTTLETCHANNELTOUTPUT

(5) Gain: Gyro

ss#ONNECTNTO THE GYROOGAIN CHANNEL OUTPUT

(6) rpm: Governor

s #ONNECT TO THE GOVERNOR SPEED CHANNEL output.

(7)Tout: Governor

ss#ONNECTNTHECTHROTTLE SERVO

(8)Rout: Gyro ss#ONNECTNTHECRUDDERDSERVO

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CONNECTING THE GY701 TO YOUR RECEIVER

Connect the supplied extensions to the GY701 connecter. Route the wires through the helicopter mechanics and connect them to the appropriate receiver channels. To determine the appropriate receiver channels please check your transmitter’s instruction manual. Using wire mounts, wiring fixtures molded into the helicopter, or hook and loop material, route the extensions to the receiver. Ensure that the extensions leading to the receiver cannot become entangled in rotating components and make sure the extensions are not rubbing against metal or carbon fiber which may damage the wires.

Once the power system is installed into your helicopter please move onto the later section to learn how to program the gyro.

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LED INDICATOR DESCRIPTION

Slow Flash: 1/2 Second or longer

Fast Flash: 1/4 Second or shorter

LED Indicator

CONDITION	LED INDICATOR	DESCRIPTION
Initialization	Red Double Flash	No Receiver Pulse or Sensor
		Error
	Slow Blue Flash	Warm-Up
	Fast Blue Flash	Sensor Initialization
	Slow Red Flash	Governor Warning
P ro g r a m -	Blue Single Flash	Parameter Programming
ming		Mode
	Slow Blue Flash	Rudder Limit Setting Mode
Operating	Solid Blue	Normal Mode, Ready for
		Flight
	Solid Red	AVCS Mode, Ready for
		Flight
	Slow Violet Flash	Offset from the Neutral Posi-
		tion (AVCS)
	Fast Blue or Red Gyro is Rotating
	Flash

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MECHANICS PREPARATIONS

WARNING

Newer high end servos and other radio equipment are capable of placing large demands on the power systems in use today. When using a regulator you must ensure that the regulator is capable of delivering the current demands of the equipment you have selected. In addition to this make sure the wiring and switch you have selected are capable of handling high current draws.

%VEN THOUGH THEH'9 IS AAHIGH PERFORMANCEN gyro and governor it will be necessary to ensure that the helicopter mechanics are also in optimum operating condition. Please use the guidelines below and address all issues before installing and test flying the GY701.

ss4HEH'9 MUSTSBE USED WITH AARIGID TAIL ROTORT DRIVE SYSTEM !NY MODERN TORQUE TUBE OR BELT DRIVE SYSTEM SHOULD BE ADEQUATE $O NOT ATtempt to fly the GY701 using a wire driven tail rotor system.

s!LWAYS ENSURE THE DRIVE GEARS TORQUE TUBE pulleys, belt, bearings and shafts are in proper working condition. If any of these items are damaged or worn they must be replaced.

ssThe linkage rod, tail rotor bell crank, pitch slider and tail rotor grips must operate without friction to obtain the best performance from the GY701. If any binding is present it must be fixed before the helicopter can be flown. Binding in the tail rotor control linkage will decrease the performance of the GY701 gyro and this may also shorten the servo lifespan. Please take the time now to ensure the tail rotor system on your helicopter is working correctly, without friction or binding. Gyro

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MECHANICS PREPARATIONS

ss6IBRATIONIWILL AFFECTCTHEH'9 SSOVERALLLPERFORmance. All rotating components on the helicopter should be balanced to minimize vibrations in mIGHT %NSURE THAT YOURUMOTORTIS RUNNING SMOOTH and all vibrations have been addressed before installing and test flying the GY701.

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OPENING SCREEN

The GY701 starts the initializing process when powered up. After it is finished initializing, the GY701 starts initializing and moves to the home screen.

Boot up display

The OLED shows the screen below. The upper line indicates the identification code of the GY701 and the line below indicates the firmware version.

Initializing display

The helicopter images are displayed during initializing. After completing the initialization, the rudder servo moves CW-> CCW as it finishes and moves to home screen. The helicopter must not be moved during the initializing process.

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HOME SCREEN

After finishing the initialization sequence, OLED changes the display to Home screen. There are 3 kinds of the Home screen related by the operation mode. The home screen shows the information follows.

Initial Home screen

•Gyro+Governor mode

2. Stop boosting					3. Gyro working mode
1. Neutral compensation					4. Gyro gain

5. on/off switch							8. Orientation indicator
6. Yaw rate comp.							7. Battery voltage

•Gyro only mode		•Governor only mode
					9. Setting
					revolution

1. Neutral compensation Gyro

It indicates the function of the neutral compensation when the pirouette stop is active. No display shows when inhibited.

2. Stop boosting Gyro

It indicates the function of the gain boosting when pirouette stop is active. “G” character is displayed when inhibited.

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HOME SCREEN

3. Gyro working mode Gyro

This indicates the gyro working mode is either AVCS or Normal mode. The inverse “A“ character is displayed when the rudder neutral is offset.

At the AVCS		At the normal		Neutral offset at
mode		mode		AVCS mode

At the AVCS mode, move the rudder stick more than 2 times left and right full within the period of 1 second and return the stick to neutral position, the rudder servo memorized the neutral position. The OLED shows the "--------" display at this condition.

Reset AVCS

Hold the rudder stick to neutral and move the gyro gain channel, Normal→AVCS→Normal→AVCS in the 1 second period. After doing so, the rudder stick neutral is memorized by the GY701 to match the rudder stick neutral. This operation is useful for rudder neutral re_trimming from normal mode to AVCS mode. After finished the operation, OLED shows "********". The GY701 always renews the rudder neutral position during power up with AVCS mode. The rudder stick must be left in the neutral position during starting up.

Reset rudder neutral

4. Gyro gain Gyro

It indicates the gyro working gain.

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