FUTABA GY701 Installation Instructions Manual
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FUTABA GY701 Installation Instructions Manual

FUTABA GY701 Installation Instructions Manual

Avcs gyro and head speed governor
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ANUAL
1M23N23906

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  • Page 1 NSTRUCTION ANUAL 1M23N23906...

  • Page 2: Table Of Contents

    • 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 •...

  • Page 3: Precautions

    : Instructions for gyro function Gyro : Instructions for governor function Governor Technical updates and additional programming examples can be found at: www.futaba-rc.com/faq RECAUTIONS Meaning of Special Markings Pay special attention to safety where indicated by the following marks: DANGER...
  • Page 4 flight. Always exit programming mode before at- tempting 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 dis- couraged since interference can cause serious operational problems.
  • Page 5 The servo type parameter within the GY701 must match the type of servo you are using. In- correct setting may damage the GY701 or the servo, possibly resulting in a loss of control during flight.
  • Page 6 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.
  • Page 7 RECAUTIONS When using the condition hold function, trans- mitter’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 gover- nor and prevent the engine from exceeding the set speed even when condition hold is set.

  • Page 8: Warranty And Repair Service (In U.s

    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 tele- phone number listed below: www.futaba-rc.com or www.hobbyservices.com...

  • Page 9: Introduction

    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 he- licopter competition. EATURES • Combined Gyro and Governor in one box. Indi- vidual either Gyro or Governor working mode are supported.
  • Page 10 EATURES • 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 •...

  • Page 11: Contents

    ONTENTS Your GY701 includes the following components: Type of set SET CONTENTS GY701 Control Amp *Mini Screwdriver *Dust Covers (x3) Gyro Sensor X --- X *Mounting Pads (x3) Governor Sensor --- X *Sensor Mounting Hardware *Magnet (x2) BLS251 Servo --- --- --- X...
  • Page 12 ONTENTS GY701 Control Amp Dust Cover Adjustment Screwdriver Mounting Pads Gyro Sensor 2mm Thick (three) Governor Sensor Magnet...
  • Page 13 ONTENTS Sensor Mounting Stay SENSOR SENS. THRO MXTR & Sx r.p.m 1 r.p.m 2 r.p.m 3 m.trim GOV on GOV off on / off r.p.m THRO GV-1 m.trim BLS251 Servo Extensions: Extension (Black) Extension (Red) (R d...

  • Page 14: Specifications

    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 com- ponents used in your installation are capable of operat-...

  • Page 15: Recommended Servos

    ECOMMENDED ERVOS .91 Size Helicopters FUTM0224 FUTM0226 FUTM0521 EPLACEMENT & PTIONAL TEMS Futaba PC Interface CIU-2: FUTM0951 FUTM4664 FUTM4665 FUTM4666 FUTM4667 FUTM4668 FUTM4669 2x22x22 mm (10) FUTM4670 FUTM4671...

  • Page 16: Connecting The Gy701 To Your Receiver

    GY701 ONNECTING THE TO YOUR ECEIVER OLED Display operation status. (3)-(6) Edit Keys accessory mini screwdriver. receiver with the supplied ex- When using an S.BUS re- nected. 4.8V (from receiver)
  • Page 17 GY701 ONNECTING THE TO YOUR ECEIVER (1) Gyro: Gyro *Insert the sensor connector until it is firmly locked. (2) Rsen: Governor (3) Rin/SB: put of the receiver. rudder channel output. Gyro (4) Tin: Governor (5) Gain: Gyro (6) rpm: Governor output.
  • Page 18 GY701 ONNECTING THE TO YOUR ECEIVER 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...

  • Page 19: Led Indicator Description

    LED I NDICATOR ESCRIPTION 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 r o g r a m -...

  • Page 20: Mechanics Preparation

    Please use the guidelines below and address all issues before installing and test flying the GY701. tempt to fly the GY701 using a wire driven tail rotor system. pulleys, belt, bearings and shafts are in proper working condition. If any of these items are damaged or worn they must be replaced.
  • Page 21 ECHANICS REPARATIONS mance. All rotating components on the helicop- ter should be balanced to minimize vibrations in and all vibrations have been addressed before installing and test flying the GY701.

  • Page 22: Opening Screen

    PENING CREEN 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.

  • Page 23: Home Screen

    CREEN 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.
  • Page 24 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 rud- der neutral re_trimming from normal mode to AVCS mode.
  • Page 25 CREEN 5. on/off switch Governor This shows the switch condition of the governor. The governor is active when ”On” displayed. 6. Yaw rate comp. Governor This indicates the revolution compensation when the pirouette is active. No display shows when the func- tion is inhibited.
  • Page 26 CREEN when the engine stop. The revolution mode can be selected either during main rotor revolution or engine revolution. The rpm character starts blink- ing slowly when the governor starts operating and blinking fast when the revolution reaches +/- 2% of the setting revolution. The rpm character changes to inverse character as the revolution increases to within +/- 1% of the setting when the revolution is locked.
  • Page 27 CREEN the data + or – key for more than one second. 2. Engine runtime Governor This displays the engine runtime integration. The dis- play is changed to runtime mode by pushing mode + key 2 times from home screen. The display unit will show seconds until 100 hours is reached xxHxxMxx, over 100 hours, minutes as xxxxHxxM.

  • Page 28: Warning Display

    CREEN 5. Operation mode [default: Gyro+Gov] This sets the operation mode of the GY701. Set to “Governor” when the gyro sensor is not used and set “Gyro” when the governor sensor is not used. Set “Gyro+Gov” when the both gyro and governor sensor are installed.
  • Page 29 ARNING ISPLAY Input error Gyro This indicates no rudder or throttle signal input. The GY701 does not work in this condition. Sensor error Gyro The gyro sensor is not working. The gyro does not work in this condition. Low battery It displays as the battery voltage becomes less than 3.8 v.

  • Page 30: Edit Screen

    CREEN The edit mode is changed to Gyro basic, Gover- nor basic, or S.Bus basic mode by pushing the data+ or- key. These modes set the basic operation for initial flight. By pushing the mode + or – key for more than 1 second at the gyro or governor screen, the editing mode is changed to the expert mode, more precise setting can be done in this mode.
  • Page 31 CREEN Push DATA Push MODE +/– key +/– key Max. revolution Home Engine runtime screen OLED display mode LED display mode Operation mode Gyro Expert Gyro Basic Governor Expert Governor Basic S.Bus Basic Push MODE +/– key for 1 second...

  • Page 32: Gyro Basic Setting

    WARNING This parameter must match the type of ser- vo you are using. Incorrect setting may damage the GY701 or the servo, possibly resulting in a loss of control during flight. (3) Gyro direction [default: Normal] Setting the gyro operation direction. Set the direc- tion as the gyro operates the servo to right direc- tion when the helicopter moves to left.
  • Page 33 – key. WARNING When using the GY701 for the first time, or when making changes in the throw of a servo, always perform the limit setting operation. (5) Flight mode [default: F3C] active rudder control, pirouette speed is faster ing the data+ or –...

  • Page 34: Gyro Sensor Installation

    Please refer to your helicopter manufacturer’s in- structions for recommended mounting locations. Installing the gyro sensor The GY701 is supplied with three 2mm Mounting Pads. When mounting the gyro in a larger electric or .50 through .91 size nitro helicopter we recom- mend using a supplied 2mm Mounting Pad.

  • Page 35: Tail Rotor Servo Installation And Setup

    Do not connect the tail rotor servo to the gyro until the servo type has been selected. Operating the servo using the incorrect setting may damage the GY701 or the servo. Once these steps are completed, turn the receiver power on and allow the gyro to initialize. Follow the instructions within the “Gyro Basic Setting”...
  • Page 36 OTOR ERVO NSTALLATION AND ETUP Install the tail rotor servo into the mechanics and connect the servo to the gyro. Remove the servo arm screw from the servo. Turn the receiver power on and allow the gyro to ini- tialize. Enter the “Gyro Basic Setting” mode and go to parameter (4) “Servo Limit Point Setting”.
  • Page 37 OTOR ERVO NSTALLATION AND ETUP Follow the instructions within the “Servo Limit Point Setting” section and set the servo limits for the tail rotor servo. Hold the tail rotor linkage over the linkage ball to avoid damaging the servo. Once the limits are set you can place the linkage onto the linkage ball.

  • Page 38: Before Flight Checklist

    Power on the transmitter and receiver. Allow the gyro to initialize. The GY701 servo type parameter matches the servo you are using. The Tail rotor servo arm is perpendicular to the pushrod and the pitch slider is centered.

  • Page 39: Adjustments During The Test Flight

    DJUSTMENTS URING THE LIGHT WARNING Always make small (1%) adjustments to the tail Over 100%, it is possible to exceed the sensor’s second). The gyro will then no longer control the pirouette rate or consistency. The pirouette rate will be extremely fast. If you experiment with the ultra-fast pirouette rate, make sure that your flight battery and fuel tank are secure.
  • Page 40 DJUSTMENTS URING THE LIGHT The tail rotor ratio, tail rotor pitch range and tail blade length play a large part in achieving opti- mum tail rotor performance. The gain value can vary drastically from model to model and the ex- act value should not play a part in the evaluation of the gyro’s performance.

  • Page 41: Using Normal Mode

    SING ORMAL Most pilots today are using AVCS Mode. If you are just starting out, it is recommended that you use AVCS Mode exclusively from the start. Normal Mode is rarely used today due to the per- formance benefits of AVCS mode. When using AVCS mode all trimming of the tail is automati- cally handled by the gyro.

  • Page 42: Setting The Gain

    ETTING THE Most modern computer transmitters will have a gyro function built into them. If this is the case, please refer to your transmitter’s instruction manual. Most modern gyro functions will allow you to set the mode of operation and the gains for several flight conditions.
  • Page 43 ETTING THE If your transmitter does not have a Gyro func- tion built in then it will be necessary to use the ATV or EPA function to control the gain. The Gyro Gain channel will generally be assigned to a switch which provides two gain values. Simply set the ATV or EPA for the gyro channel to the desired gain value and set the Gain Switch to the desired mode of operation.

  • Page 44: Governor Basic Setting

    OVERNOR ASIC ETTING This sets the governor’s fundamental functions. The menu (9) Servo limit point setting must be set first. Push MODE +/– key (1) Start display The editing menus are scrolled by pushing the mode + or – key. (2) Revolution setting [range: 1000 3000 rpm]...
  • Page 45 OVERNOR ASIC ETTING (3) Gear ratio [default: 8.00, range: 3 Input the main rotor gear ratio by pushing the data + or-key. Notes: speed and actual engine speed will be differ- ent. copter instruction manual. If the helicopter in- struction manual does not give the gear ratio, calculate the gear ratio as follows: Engine Rotor...
  • Page 46 WARNING This parameter must match the type of ser- vo you are using. Incorrect setting may damage the GY701 or the servo, possibly resulting in a loss of control during flight. (5) Stick switch [default: 30%] The governor can be activated by throttle stick position.
  • Page 47 OVERNOR ASIC ETTING (Governor operating point) Set speed Set point or more and 60% of set speed set speed more than the slow side 100% set point or less (OFF region) (OFF at slow side)
  • Page 48 OVERNOR ASIC ETTING Invalid display (at PWM) (6) Governor on/off switch [default: Inhibit] It selects the governor activate switch if addi- key activates the function. The on/off direction key. This function is only available at S.Bus con- nection. “Invalid” is displayed at PWM connec- tion.
  • Page 49 OVERNOR ASIC ETTING (7) Battery failsafe setting [default: Inhibit] The governor goes into the failsafe mode activated, the governor is deactivated and the throttle servo is moved to B/FS position. Move the throttle stick to idle position, the B/FS condi- Move the throttle stick to B/FS position as de- sired, push set key to confirm the setting.
  • Page 50 + or – key to memorize. “*Finish*” is dis- is displayed when the setting position is out of through). When using the GY701 for the first time, or when making changes in the throw of a servo, always perform the limit setting operation.
  • Page 51 OVERNOR ASIC ETTING (11) Revolution sensor testing It tests the output level of the revolution sensor. Turn the engine by hand, and check the output level. The display indicates the current level on left side numbers, maximum level on right side numbers.

  • Page 52: Mounting The Magnet And Sensor

    OUNTING THE AGNET AND ENSOR Modify the cooling fan and install the accessory magnet and attach the magnetic sensor to the en- gine at the position shown below. Cooling fan Magnet (Embedded in cooling fan.) Sensor (Attached to engine flange through a stay.) When installing the sensor mag- net to the muffler side, also refer...
  • Page 53 OUNTING THE AGNET AND ENSOR Cooling fan modification Drill a hole in the fan at the magnet mount- ing position. Make the hole about 4.1mm in diameter and 1.5 to 1.7mm deep. Embed the magnet in this hole in the direc- tion in which an output is obtained.
  • Page 54 OUNTING THE AGNET AND ENSOR between the sensor and magnet can be made 1 to 2mm. Tighten the sensor stay together with the engine mounting flange. (Temporary assembly) Select the mounting method so that the sensor does not touch the frame, or other parts of the helicopter.
  • Page 55 OUNTING THE AGNET AND ENSOR The center of the sensor is different from the center of the sensor case so be careful when mounting the sensor. If the display is less than 60% when the magnet is directly below the sensor, bring the sensor closer to the magnet so that the 60% or more is displayed.

  • Page 56: Fuselage Setting Precautions

    USELAGE ETTING RECAUTIONS Throttle servo linkage precautions To effectively use the governor, observe the fol- lowing precautions when connecting the servo linkage. Make the servo operating range as wide as possible. Make the throw of the transmitter EPA (ATV) function and AFR function as close as possible to 100%.
  • Page 57 USELAGE ETTING RECAUTIONS different from that with a normal muffler. Adjust the needle (and pipe length) so that engine speed changes are proportional to the throttle opening. If the engine speed does not change linearly, the governor will not perform satisfactorily with a muffler or a pipe that does not allow the carbure- tion to be linear.

  • Page 58: Governor Operation

    The GY701 operates from 1000 to 3000rpm main rotor speed. However, the engine must be running at the set speed. The GY701 turns off the gover- nor when the engine is starting or idling. * Governor operation: Operation that stabilizes the en- gine speed at the set speed.
  • Page 59 PERATION has changed. Deviation from set speed: The GY701 stabilizes the engine speed to within +1% of the set speed. For example, if the rotor R.P.M. is set to 1500rpm, the Rotor R.P.M. speed will deviate about ±15rpm. However, this poses no problem from...

  • Page 60: Governor Speed Setting

    OVERNOR PEED ETTING The GY701 is used by connecting the “rpm” input to the governor speed setting channel of your sys- tem. When using an independent governor on/off switch, activate the “(6) Governor on/off switch” funtion within the “Governor Basic Setting” section earlier in this manual.
  • Page 61 OVERNOR PEED ETTING speed display, however this could show some un- locked main rotor condition which is not accurate. Reference The transmitter EPA function can also be used to change the point 1 and point 3 speed settings to a certain extent.

  • Page 62: S.bus Basic Setting

    S.Bus connec- tion, only one main S.Bus wire is connected to receiver and GY701 can complete the operation. In addition, governor on/off switch function, F/ F mixing can be available through the S.Bus con- nection.
  • Page 63 S.BUS B ASIC ETTING (2) S.Bus setting: Rudder channel [default: 4ch] Push data + or – key to match the transmitter rudder channel. (3) S.Bus setting: Gyro gain [default: 5ch] Push data + or – key to match the transmitter gyro gain channel.
  • Page 64 S.BUS B ASIC ETTING (6) S.Bus setting: GOV. on/off channel [de- fault: 8ch] Push data + or – key to match the transmitter governor on/off channel. (7) S.Bus setting: Pitch channel [default: INH] Push data + or – key to match the transmitter pitch channel.

  • Page 65: Gyro Expert Setting

    XPERT ETTING This sets the detail of the gyro function for the ex- pert modeler. Push the mode + or – key for more than one second on the Gyro Basic menu, to go into the Gyro Expert menu. Push mode + or – key for more than one second again on the Gyro Ex- pert menu to be returned to the Gyro Basic menu.
  • Page 66 XPERT ETTING (4) Rudder exponential default: -60% (F3C-AVCS), -40% (F3C-Normal), -20% (3D- AVCS), -20% (3D-Normal) ranges: -100% +100% This sets the feeling of the rudder control. De- creasing the rate to minus, the rudder control is softer, and is quicker when the value is increased to plus side.
  • Page 67 XPERT ETTING (7) Control delay Out default: F3C=10, 3D=12 ranges: 0 This sets the rudder control delay of moving to neutral from right or left side. It can adjusts left and right individually. Adding to the value, the control feeling will be mild. Pushing data+ or – key, the value is changed.
  • Page 68 XPERT ETTING (10) Pirouette speed default: 450 deg/sec (F3C), 720 deg/sec (3D) ranges: 100 999 deg/sec This adjusts the pirouette speed of the rudder. The default values are set 450 deg/sec on F3C mode and 720 deg/sec on 3D mode when rudder is 100 %.
  • Page 69 GY701 installs the pitch-> rudder mixing inter- nally. The swash signals are mixed in the swash mode. The correct F/F mixing is achieved by individual pitch signal is input in the GY701.
  • Page 70 XPERT ETTING Separate the pitch signal in the transmitter, and in- put this signal to the GY701. To do that, make the programmable mixing as pitch-> AUX, and input AUX signal to the GY701. This function is only available by the S.Bus con- nection.
  • Page 71 (19) Pitch low setting default: 1940 uS This sets the minimum pitch point of GY701. Move the pitch stick to minimum pitch, push data+ or – key. The minimum pitch signal is memorized in the GY701. The display shows mark at the setting point.
  • Page 72 XPERT ETTING key, the mode is changed. (22) Neutral compensation default: ON (F3C), Off (3D) This function works to recall the neutral point of the rudder servo for improving tail stop motion. To use this function effective, hover the helicopter for about one second, and memorize the neutral point.
  • Page 73 XPERT ETTING (25) Gyro data reset It resets the gyro parameter to the default setting. The “Exec.??” is displayed by pushing data + or – key for confirmation. Push data+ or – key again, the reset process is done and displayed “-Exec.—“ and return to the start display.

  • Page 74: Governor Expert Setting

    OVERNOR XPERT ETTING This sets the details of the governor function for the expert modeler. Push the mode + or – key for more than one second on the Governor Basic menu display, to get into the Governor Expert menu. Push mode + or – key for more than one second again on the Governor Expert menu to be returned to the Governor Basic menu.
  • Page 75 OVERNOR XPERT ETTING (3) Revolution display mode default: Rotor This selects the revolution display mode for either the main rotor or engine revolution. Pushing data+ or – key, the mode is changed. (4) Operation response default: Middle This selects the governor operation response. Select the best match for your engine type.
  • Page 76 The fixed throttle input is utilized related to the revo- lution. It is recommended for electric motors. Tx.Curve: GY701 uses the exact throttle input from the trans- mitter. The throttle curve setting on the transmitter is required. When the Rev.Lmt mode is selected, this mode should be selected.
  • Page 77 OVERNOR XPERT ETTING This sets the delay of the revolution from high to low. Pushing data+ or – key, the value is changed. (9) Start delay default: 5 range: 2 This sets the delay during the starting of the governor. Pushing data+ or – key, the value is changed.
  • Page 78 “-Exec.—“ and return to the start display. Pushing mode+ or – key during confirmation display, the reset process is aborted. FUTABA CORPORATION Phone: +81 475 32 6982, Facsimile: +81 475 32 6983 1080 Yabutsuka, Chosei-mura, Chosei-gun, Chiba 299-4395,...

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