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FUTABA GV-1 Instruction Manual

Governor for model helicopter
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GOVERNOR FOR MODEL HELICOPTER
GV-1
INSTRUCTION MANUAL

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Summary of Contents for FUTABA GV-1

  • Page 1 GOVERNOR FOR MODEL HELICOPTER GV-1 INSTRUCTION MANUAL...
  • Page 2 -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. -This manual has been carefully written. Please contact Futaba if you feel that any cor- rections or clarifications should be made to the contents of this manual.

  • Page 3: Table Of Contents

    Definition of symbols 6 Setting precautions 7 Operating precautions 9 BEFORE USE 10 Set contents 10 Nomenclature 11 Overview of GV-1 operation 12 Examples 14 ASSEMBLY & ADJUSTMENT 16 Mounting the magnet and sensor 16 GV-1 connections 21 Fuselage setting precautions 22...

  • Page 4: Precautions

    PRECAUTIONS To ensure safe use, please observe the following precautions. Definition of symbols Pay close attention to the parts of this manual indicated by the following sym- bols. Symbol Meaning Indicates a procedure that could result in serious injury or death to the user or other persons if ignored and not per- formed properly.

  • Page 5: Setting Precautions

    Always set battery fail safe function at the GV-1. (Setting method: Page 44) Since the GV-1, when used, controls the throttle, the battery fail safe function that is in a PCM transmitter will not be used. Because the GV-1 controls the throttle, the throttle channel fail safe function normally set in a PCM transmitter will not be used.
  • Page 6 The center of the sensor is Center of sensor is offset. different from the center of the sensor case so be careful Sensor when mounting the sensor. case (Setting method: Page 16) When using the PCM1024Z transmitter When using the condition hold (CHD) function, always set the throttle servo maximum operating point (MAX THR) to 20% or less.

  • Page 7: Operating Precautions

    Operating precautions At the beginning of flight, keep the governor in the OFF state by setting the throttle stick to no more than 20% from the slow side. While the engine is running, turn on the governor at the point which the throttle stick is at least 20% from the slow side and the engine speed exceeds 70% of the set speed.

  • Page 8: Before Use

    BEFORE USE Set contents Immediately upon opening the carton, check if the following items are sup- plied. GV-1 control amp Magnet GV-1 magnetic sensor Seal Sensor mounting stay For 30 engine SENSOR SENS. THRO MXTR & Sx r.p.m 1 r.p.m 2 r.p.m 3...

  • Page 9: Nomenclature

    Adjust the contrast with the accessory miniature screwdriver. Seal SENSOR SENS. THRO MXTR & Sx r.p.m 1 r.p.m 2 r.p.m 3 Stick this seal to the sensor and servo connec- m.trim GOV on GOV off tors, transmitter switch, etc. on / off r.p.m THRO GV-1 m.trim...

  • Page 10: Overview Of Gv-1 Operation

    Overview of GV-1 operation The GV-1 operates from 1000 to 2100rpm main rotor speed . However, the engine must be running at the set speed. The GV-1 turns off the governor when the engine is starting or idling. *Governor operation = Operation that stabilizes the engine speed at the set speed.
  • Page 11 (Deviation from set speed) The GV-1 stabilizes the engine speed to within +1% of the set speed. For example, if the rotor R.P.M. is set to1500rpm, the Rotor R.P.M. speed will deviate about +15rpm. However, this poses no...

  • Page 12: Examples

    Examples The GV-1 functions can be selected to match the transmitter used. Select the functions by referring to the examples shown below. Function Connection Speed Governor Mixture switching on/off function Throttle servo Not connected None Three ON/OFF 2P switch channel...
  • Page 13 Function Connection Speed Governor Mixture switching ON/OFF function Throttle servo None None Not connected Speed set at governor side. 2P switch channel Not connected Throttle channel Throttle servo None None Not connected Not connected Speed set at governor side. Not connected Throttle stick Throttle channel When there is no vacant channel...

  • Page 14: Assembly & Adjustment

    ASSEMBLY & ADJUSTMENT Mounting the magnet and sensor Modify the cooling fan and install the accessory magnet and attach the mag- netic sensor to the engine at the position shown below. Cooling fan Magnet (Embedded in cooling fan.) Sensor (Attached to engine flange through a stay.) When installing the sensor magnet to the muffler side,...
  • Page 15 The sensor and stay mounting directions depend on the sensor mounting position. Direction of mounting the sensor to the stay. Magnet Distance from center of engine shaft Cooling fan Magnet mounting position Magnet mounting method The tables below show the magnet mounting position (example) for each en- gine.
  • Page 16 Magnet direction check (Magnet operating side check) Servo Connect the sensor to Sensor connectors connectors the control amp. Connect a battery di- rectly to one of the servo When a battery is connected to the servo connectors, the control amp is activated. connectors.
  • Page 17 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 he- licopter. Temporarily mount the sensor and select the magnet mounting position. -Install the sensor to the sensor stay using the accessory screws and wash- ers.
  • Page 18 Sensor adjustment Call the "sensor percentage" screen. Adjust the sensor position to ob- tain a sensor output of at least Sensor Magnet 60%. 1-2mm Center of sensor is offset. Sensor Align the sensor center position and case the center of the magnet shown in the figure at the left.

  • Page 19: Gv-1 Connections

    GV-1 connections Magnetic sensor Throttle servo Control amp Mixture servo Connected only when fuel mixture function used. Speed setting channel Throttle channel Connected when speed set from transmitter Governor ON/OFF / Mixture trim channel Connected when the governor is turned on and off...

  • Page 20: Fuselage Setting Precautions

    Fuselage setting precautions Throttle servo linkage precautions To effectively use the governor, observe the following precautions when con- necting the servo linkage. -Make the servo operating range as wide as possible. Make the throw of the transmitter ATV function, AFR function, and func- tions as close as possible to 100%.
  • Page 21 Control amp mounting Cushion the control amp with sponge rubber, the same as the receiver and other parts.

  • Page 22: Functions

    FUNCTIONS LCD display and edit keys LCD panel Edit keys Set-up screen call The set-up data can be displayed and the governor operating state The set-up screens can be sequen- can be monitored. tially called with the FUNC+ and FUNC- keys. The order in which the set-up screens are called, please see the function map.

  • Page 23: Function Map

    Rotation sensor monitor (monitor function) (P46) Note 1. The "Limit Set" screen is displayed only when the power is turned on for the first time after the GV-1 is purchased. Once limit setting is performed, the "Speed display" screen becomes the initial screen.

  • Page 24: Initial Setting For Governor Operation

    Initial setting for governor operation When using the governor for the first time, or when the throttle linkage or the fuselage was changed, always perform this initial setting. The set data are saved even when the power is turned off. Throttle limit setting (Governor idle/high/stop points setting) Call the "limit set"...
  • Page 25 Rotor gear ratio setting (Rotor gear ratio input) Call the "rotor gear ratio" screen with the FUNC+ or FUNC- KEY. Notes: Input the gear ratio -If the gear ratio is not properly set, the set from the DATA+ or speed and actual engine speed will be dif- DATA- key.
  • Page 26 Set the speed of each point by repeating step "2". The set points can be verified at "rSx" (x=1,2,3) of the display screen. Note: When the speed setting channel travel (ATV, AFR) is made 20% or less, points 1 and 3 cannot be set. Speed setting points The engine maximum speed range limits the maximum speed setting.
  • Page 27 Governor ON/OFF operation mode setting A. When governor turned on and off by on/off switch Call the "governor on/off switch position set-up" screen with the FUNC+ or FUNC- key. Operate the ON/OFF switch and verify the ON/ OFF directions at the LCD display. Use the DATA+ or DATA- key to change the switch ON/OFF directions.
  • Page 28 C. When linked with throttle stick (When there is no vacant channel) Call the "governor on/off stick op- eration set-up" screen with the FUNC+ or FUNC- key. Switch the display from INH to on/off with the DATA+ or DATA- key. When the stick switch is operated, the display switches from "off"...
  • Page 29 Call the "battery fail safe" screen with the FUNC+ or FUNC- key. Set the battery fail safe window to "ACT" with the DATA+ or DATA- key. Call the "battery fail safe position" window with the FUNC+ or FUNC- key. Set the throttle stick to the desired position and press the DATA+ or DATA- key.
  • Page 30 Speed sensor output check Check the sensor output not only when installing the sen- sor 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. Call the "sensor percentage"...

  • Page 31: Description Of Functions

    Description of functions The following describes, in display order, the functions which can be set or monitored with the GV1. The functions are described from the called state. The functions can be sequentially called with the FUNC (+ or -) keys. Speed display (monitor function) This function displays the engine speed or rotor speed.
  • Page 32 Speed setting rS1~rS3 The speed can be set for three points. Connect the speed setting input "AUX(r.p.m)" to a receiver vacant channel. (Set value check) Operate the switch (3-position), or variable resistor knob. The set values are displayed on the LCD screen in rS1->rS2- >rS3 (slow->medium->high) order.
  • Page 33 Speed display mode Disp The speed display mode can be changed. Engine speed display (Eng) or rotor speed display (Rot) can be selected. (Mode switching) The display is switched each time the DATA+ or DATA- key is pressed. (Initial value) Rot Rotor gear ratio This function inputs the gear ratio between the main rotor and the engine to display the rotor speed.
  • Page 34 Governor ON/OFF switch position setting SWPt This set-up screen sets the direction of operation of the switch when the governor is turned on and off with the transmitter switch. The governor on/off input "AUX(on/ off)" connects to a receiver vacant channel. (Setting direction check) Operate the switch.
  • Page 35 Governor ON/OFF switch operation setting StSw If the governor is turned on and off by using the throttle stick position, then by selecting. "INH" inhibit it willturn off the governor at the maximum slow position. When this function is set to the side at which on/off switching is per- formed, when "OFF"...
  • Page 36 Setting of Governor OFF at high stick position GvOf The governor can be turned off at the high side from the set point. However, this function is only effective when the speed is set to 1600rpm or more. It will not operate even if the speed is set to a value lower than this.
  • Page 37 "Gov" mode. Not all Futaba transmitters have Fuel Mixture Function (FMC), however it is not necessary since the GV-1 has a mixture control function.
  • Page 38 Note: Setting the "Dir" mode disables the "governor ON/OFF switch" function. In the "Dir" mode, always set the "mixture trim" function to INH. In the "Gov" mode, when the mixture trim function is ACT, the AUX (m.trm) connector becomes the mixture trim and when the mixture trim function is INH, the AUX (m.trm) connector becomes the governor ON/ OFF switch input.
  • Page 39 ("Gov" mode) ("Dir" mode) Set the rate with the Transfer the mixture DATA+ key (increase) or curve data of that point DATA- key (decrease). from the transmitter by pressing the DATA+ or DATA- key. However, to match the mixture curve data with the transmitter curve data as final servo output, match the "ATV"...
  • Page 40 Mixture ATV Sets the mixture servo throw. Set the operation angle in accordance with the mixture carburetor instruction manual. (Setting method) Operate the throttle stick and se- lect "ATVA" (slow side) or "ATVB" (high side.) Set the steering angle by pressing the DATA+ key (increase) or DATA- key (decrease).
  • Page 41 Mixture trim MTrm Set when you want to use a vacant volume channel to use the mixture servo trim function. "INH" disables the mixture trim function. To use the trim func- tion, set MTrm to "ACT" and connect the AUX (m.trim) connector to the vacant channel you want to use.
  • Page 42 Battery fail safe B/FS The battery fail safe function can be activated and inhibited. "INH" inhibits the battery fail safe function and "ACT" activates the battery safe function. When activating the battery fail safe function, set the servo position with the "battery fail safe position" function. (Setting method) Set the mode by pressing the DATA+ or DATA- key.
  • Page 43 Limit set This function sets the governor control range. When using the governor for the first time, and when the servo throw was changed, always perform limit setting again. (Limit setting method) When"Idle" is flashing, set the throttle stick to the maximum slow position and press the DATA+ or DATA- key.
  • Page 44 Error display When adjusting the throttle linkage make sure that ATV and AFR are set to 50% or greater otherwise the GV-1 will not operate and "-ERR-" will be displayed. Also when setting the "Stop"position make sure it is not higher than idle or the "-ERR-"...

  • Page 45: Reference

    REFERENCE Specifications and ratings are subject to change without prior notice. Specifications -Control system: Digital advanced control -Speed pick-up: Direct detection of engine rotation by magnetic sensor -Control resolution: 0.1Hz (+6rpm: engine speed) -Speed stability accuracy: 1% -Control response: 20mS -Speed control range: 1000~2100rpm (rotor speed) -Speed setting: Key input (10 turns step) Transmitter setting (1 turn step)

  • Page 46: Glossary

    Speed setting position Receiver Gov, GOV Governor Governor Governor Rotation sensor monitor P46 Rotor gear ratio SENSOR Sensor GV-1 Model No. of this governor Stop Stop point GvOf Governor off high point stick Stsw Governor on/off stick operation position operation setting setting...

  • Page 47: Gv-1 Parameters Sheet

    *Please copy and use. GV-1 PARAMETERS SHEET Helicopter: Engine: Date: Parameter Initial value Set value Remarks Speed 1 (rS1) 1300rpm Speed 2 (rS2) 1500rpm Speed 3 (rS3) 1700rpm Speed display (Disp) Rotor Rotor gear ratio (GRt) 9.70 Mixture trim (MTrm)

  • Page 48: Repair Service

    Please read the warranty card supplied with your system. When requesting warranty, please send the card along with some type of dated proof of purchase. If you have any questions regarding this product, please consult your local hobby dealer or contact the Futaba Service Center.
  • Page 49 FUTABA CORPORATION Makuhari Techno Garden Bldg., B6F 1-3 Nakase, Mihama-ku, Chiba 261-8555, Japan Phone: (043) 296-5119 Facsimile: (043) 296-5124 ©FUTABA CORPORATION 1999,03...

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