Futaba GV-1 User Manual

GOVERNOR FOR MODEL HELICOPTER

GV-1

INSTRUCTION MANUAL

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Thank you for purchasing a Futaba GV-1 governor.

To ensure safe use, please read this manual thoroughly before using your new governor. After reading this manual, store it in a safe place.

FOREWORD

The GV-1 is an engine governor for model helicopters.

The governor automatically maintains constant rotor R.P.M.due to load changes (reaction to torque) by suppressing variations in the engine speed. The GV-1 works very well in all maneuvers, from hovering to flying.

-Engine speed can be set from both the GV-1 and the transmitter. -A magnetic sensing system reads the engine speed.

-Fuel mixture control can be set.

-An LCD panel displays the engine speed and set data.

-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 corrections or clarifications should be made to the contents of this manual.

-Futaba is not responsible for the results of use of this product by the customer.

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TABLE OF CONTENTS

PRECAUTIONS 6

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

FUNCTIONS 24

LCD display and edit keys 24

Low battery alarm 24

Function map 25

Initial setting for governor operation 26

Description of functions 33

REFERENCE 47

Specifications 47

Glossary 48

GV-1 PARAMETERS SHEET 49

REPAIR SERVICE 50

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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 symbols.

Symbol

Meaning

Indicates a procedure that could result in serious injury or death to the user or other persons if ignored and not performed properly.

Indicates a procedure that could result in death or serious injury to the user or other persons, as well as physical damage, if ignored and not performed properly.

Indicates a procedure that may result in serious injury to the user or other persons, or physical damage only, if ignored and not performed properly.

Graphic symbols

; Operations that must not be performed.

; Operations that always must be performed.

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Setting precautions

When using the GV-1 for the first time, or when making changes in the throw of a servo, always perform the limit setting operation.

(Setting method: Page 45)

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. Set the fail safe function as described below.

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 will be output directly.

PRECAUTIONS

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PRECAUTIONS

The center of the sensor is different from the center of the sensor case so be careful when mounting the sensor.

(Setting method: Page 16)

Center of sensor is offset.

Sensor case

2.2
mm
3.7mm	3.7mm

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.

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.

(Governor ON conditions)

The following conditions must be performed, to turn on the governor:

-Governor ON/OFF switch set to ON position. -Throttle stick set to 20% or more from slow position. -Engine speed raised to 70% or more of set speed.

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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.

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.

Periodically check the sensor output. (Check method: Page 46)

The magnet rotates at high speed and is subjected to a large centrifugal force.

Check the sensor output and mounting state about once every 10 flights.

If the model begins to shake during operation, immediately turn off the governor.

(See "Governor on/off operation mode setting" on page 29.)

When engine speed is not stable at high R.P.M.'s

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.

PRECAUTIONS

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BEFORE USE

Set contents

Immediately upon opening the carton, check if the following items are supplied.

GV-1 control amp

USE BEFORE

Seal

	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

Magnet

GV-1 magnetic sensor

Sensor mounting stay

For 30 engine

For 60 engine

Sensor mounting screws

Miniature screwdriver

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Nomenclature

Control amp

LCD display panel

Displays the speed and set data.

Sensor connector

Servo connectors

Receiver connectors Edit keys

Used to set data. Press with the accessory miniature screwdriver.

LCD contrast trimmer

The display contrast can be adjusted so that the LCD display is easy to read. Adjust the contrast with the accessory miniature screwdriver.

BEFORE USE

Seal

Stick this seal to the sensor and servo connectors, transmitter switch, etc.

	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

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USE BEFORE

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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.

When governor turned on and off by switch (Normal condition)

Setting the switch to the ON position turns on the governor. The following describes this operation.

Governor can be turned on and off by a switch.

-Throttle stick set at least 20% from slow position and engine running at 70% or more of set speed ->->-> ON

-Throttle stick set to maximum slow position ->- >-> Remains ON

-Switch set to off position ->->-> OFF

When governor turned on and off by transmitter throttle stick

The data is set so that the governor can be turned on and off with the transmitter throttle stick. The following describes this operation.

100%

15% or less (OFF region)

0%

(OFF at slow side)

-Throttle stick set at least 20% from slow side and engine running at 70% or more of set speed ->->-> ON

-Throttle stick held at 15% or more from slow side ->->-> Remains ON

-Throttle stick lowered 15% or more from slow side ->->-> OFF

(Governor operating point)

Set speed

20% or more of stick deflection and 70% of set speed

For safe operation, do not turn on the governor under the conditions shown below. If satisfied while the governor is on, the following conditions will forcibly turn the governor off.

When the governor is off, the transmitter throttle stick controls the throttle servo.

-Engine started while governor switch in ON position.

-Engine speed is 70% or less of set speed and throttle stick is set to 20% or less from slow side after engine started (governor starting only).

-Speed set to 999rpm or less (OFF setting). -Stick signal is lower than stop position setting. -Engine stopped, or sensor signal abnormal.

-Throttle stick set 15% or less from slow side (only when function that turns governor on and off by stick is set).

The following operations do not indicate trouble: (When engine speed rises above the set speed)

A near-vertical dive may cause the engine speed to rise above the set speed.

(Throttle operation speed and ON/OFF point)

If throttle operation exceeds 70% of the set speed and the rotor speed rises to the set value, the ON/OFF point may seem to differ with the operating speed. Delay operation to smoothen the switching operation causes this and does not mean that the ON/OFF point has changed.

(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 problem from the standpoint of practical use.

BEFORE USE

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Examples

The GV-1 functions can be selected to match the transmitter used. Select the functions by referring to the examples shown below.

USE BEFORE

Example 2 Example 1

Example 3

		Function			Connection
	Speed	Governor	Mixture
	switching	on/off	function
	1			Sx	Throttle servo
		OFF	None		Not connected
	2	ON
	3
	Three	ON/OFF		Rx	2P switch channel
	positions
	CH7(example)	CH8(example)			3P switch channel
	When used with PCM1024Z				Throttle channel
	1	Speed		Sx	Throttle servo
		switching	None		Not connected
	OFF
		position 1
	3
		used
	Two positions
				Rx	Not connected
	CH7(example)
	When used with FF8 or PCM1024Z				3P switch channel
	(without mixture function)				Throttle channel
		Speed		Sx	Throttle servo
	OFF	switching
					Mixture servo
	2	position 1
	3	used
	Two positions		Mixture	Rx	Volume channel
	CH7(example)		control used		3P switch channel
	When used with FF8 or PCM1024Z				Throttle channel
	(with mixture function)

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Example 4

Example 5

		Function		Connection
	Speed	Governor	Mixture
	switching	ON/OFF	function
		OFF	Sx	Throttle servo
	None			Not connected
		ON	None
	Speed set at	on/off	Rx	2P switch channel
	governor side.
				Not connected
				Throttle channel
			Sx	Throttle servo
	None			Not connected
			None
	Speed set at		Rx	Not connected
	governor side.	ON/OFF		Not connected
		Throttle stick		Throttle channel
	When there is no vacant channel

BEFORE USE

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ASSEMBLY & ADJUSTMENT

Mounting the magnet and sensor

ADJUSTMENT & ASSEMBLY

Modify the cooling fan and install the accessory magnet and attach the magnetic 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, also refer to the needle side mounting.

Magnet and sensor mounting

Offset the sensor

center position.

2.2
mm
3.7mm	3.7mm

Sensor case

Align the sensor center position and the center of the magnet shown in the figure at the left.

Sensor center position

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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.
60 engine			30 engine
Mounting	Distance from		Mounting	Distance from
	center of			center of
position			position
	engine shaft			engine shaft
Needle side	27.1-28.8mm		Needle side	22.0-24.0mm

With a Kyosho 60 helicopter, do not use a stay. Mount the sensor directly to the

helicopter frame.

ASSEMBLY & ADJUSTMENT

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