1M23N21902
INSTRUCTION MANUAL
YAW-AXIS STABILIZER FOR MODEL HELICOPTER
(RATE GYRO)
Thank you for purchasing a GY520 AVCS gyro.
Before using your new gyro, please read this instruction manual
thoroughly and use the gyro properly and safely. After reading this
manual, store it in a safe place.
FOREWORD
The GY520 is a small heading hold AVCS rate gyro for model helicopters. Advanced tail control from electric helicopters to 90 size
helicopters is realized by adoption of an advanced high speed control algorithm.
*AVCS: Active Angular Velocity Control System
[GY520 Features]
• Small size and light weight (20.8x20.8x11.0mm, 8g)
• High speed control (280Hz/560Hz variable)
• F3C mode and 3D mode selectable
• Compatible with both digital (1520ȝS/760ȝS) and analog servos
• Simple setting by button and LED combination
• Parameters can be set through a PC by using the optional USB
adapter (CIU-2) and dedicated software (Expansion function)
[Recommended servos]
Helicopter servos;
•1520ȝS neutral type
S9254, BLS254, S9257 (for small EP helicopters)
•760ȝS neutral type
S9256,
CAUTION
ｎ
ｊ
BLS251
Always set the mode matched to the type of servo
connected to the GY520.
(Servo selection function p.24)
to be
• The GY520 is compatible with digital (1520μS and 760μS) servos.
However, the mode matched to the type of servo must be selected. If the GY520 is operated in the wrong mode it may malfunction
or the servo may be damaged.
2
T
ABLE OF
FOR SAFETY
• Meaning of Special Markings -------------------------------4
• Mounting/Operating Precautions ---------------------------4
• Fuselage Maintenance Precautions -------------------------7
BEFORE USE
• Set Contents ---------------------------------------------------8
• Name and Function of Each Part ------------------------- 10
• GY520 Operation ------------------------------------------- 12
INSTALLATION AND ADJUSTMENT
• Installing to Fuselage --------------------------------------- 15
C
ONTENTS
• Initialization ------------------------------------------------- 18
• Linkage Adjustments --------------------------------------- 19
• Flight Adjustments ------------------------------------------ 21
DESCRIPTION OF FUNCTIONS
• GY520 Operating Parameters Setting -------------------- 23
• Gyro Sensitivity Setting ------------------------------------ 28
REFERENCE
• Speci¿cations ------------------------------------------------
• Repair Service (in U.S.A.) --------------------------------- 39
Warning: This product contains a chemical known to cause cancer
and birth defects or other reproductive harm.
37
• 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 write to Futaba if you feel that
any corrections or clarifications should be made.
3
OR SAFETY
F
F
OR
To ensure safe use, observe the following precautions.
S
AFETY
Meaning of Special Markings
Pay special attention to the safety at the parts of this manual
that are indicated by the following marks.
Mark Meaning
Procedures which may lead to a dangerous
DANGER
ｎ
WARNING
ｎ
condition and cause death or serious injury to
the user if not carried out properly.
Procedures which may lead to a dangerous
condition or cause death or serious injury to
the user if not carried out properly, or pro
cedures where the probability of superficial
-
injury or physical damage is high.
Procedures where the possibility of serious
injury to the user is small, but there is a dan-
CAUTION
ｎ
Symbol:
ger of injury, or physical damage, if not carried out properly.
; Prohibited,
ｌ
; Mandatory
ｊ
Mounting/Operating Precautions
WARNING
ｎ
Insert the connectors fully and firmly.
ｊ
• If a connector works loose due to vibration during flight, con
-
trol may be lost and result in a dangerous situation.
Always use the GY520 with a FASST-2.4GHz system
ｊ
or PCM system.
4
ORSAFETY
F
• Using the GY520 with an FM system, when noise enters, the
wrong neutral position may be memorized.
When mounting the GY520, provide a little surplus so
ｊ
• If the GY520 cables are too taut, the gyro will not display its
full performance. If the sensor peels, control will be lost and
result in a dangerous situation.
ｊ
• 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.
that the sensor connection cables are not too taut.
Always check the direction of operation of the ser-
vos.
CAUTION
ｎ
Always set the mode matched to the type of servo to
ｊ
• The GY520 is compatible with digital (1520μS and 760μS)
servos. However, the mode matched to the type of servo must
be selected.
may malfunction or the servo may be damaged.
ｊ
• This is necessary to securely fasten the sensor to the fuse
lage so that operation of the gyro does not transmit unwanted
fuselage vibrations directly to the sensor.
ｊ
be connected to the GY520. (Servo selection function
p.24)
If the GY520 is operated in the wrong mode it
Always use the accessory sensor tape to install the
GY520 to the fuselage.
Mount the GY520 so that metals or other conductive
objects do not touch these cases.
-
• The GY520 uses a conductive resin case to reduce electro
magnetic interference. Because the surface of the case is
conductive, metal objects may cause a short circuit.
5
-
OR SAFETY
F
Precautions When Turning on the Power Switch
Do not move the helicopter until the flashing of the
ｌ
ｊ
• Re-reading method:
Turn on the transmitter in the AVCS mode, then turn on the
gyro. Or quickly switch (interval of within 1 second) the remote
gain channel switch between the AVCS mode and Normal
mode at least three times and switch the AVCS side with the
transmitter in the ON state. This memorizes the new rudder
position inside the GY520.
monitor LED goes out (in about 5 seconds). Also, do
not move the transmitter rudder stick from the neutral position during this period.
When the rudder neutral position was changed by
the linkage, the rudder neutral position in the AVCS
mode must always be re-read before use.
Avoid sudden temperature changes.
ｊ
• Sudden temperature changes will cause the neutral position
to change. For example, in the winter, do not fly immediately
after removing the model from inside a heated car and in the
summer, do not fly immediately after removing the model from
inside an air conditioned car. Allow the model to stand for
about 10 minutes and turn on the power after the temperature
inside the gyro has stabilized. Also, if the gyro is exposed to
direct sunlight or is mounted near the engine, the temperature
may change suddenly. Take suitable measures so that the
gyro is not exposed to direct sunlight, etc.
Check the remaining receiver/gyro/servo nicd battery
ｊ
operating time during the adjustment stage and decide how many flights are remaining.
Never use the transmitter rudder trim in the AVCS
ｌ
• When the rudder is trimmed during flight, the neutral position
will change.
mode.
6
ORSAFETY
F
When using the GY520 in the AVCS mode, set revolu-
ｊ
ｌ
• The gyro sensor is vulnerable to shock and may be damaged
by strong shock.
tion mixing to OFF.
Do not strike the gyro body against a hard object or
drop the gyro onto a concrete or other hard floor surface.
Fuselage Maintenance Precautions
CAUTION
ｎ
Use a tale rotor drive tube or other part with a high
ｊ
• The amount of improvement of gyro performance has a con
siderable effect on the fuselage vibration level or the size,
type, linkage method, looseness, etc. of the tail rotor.
Since a higher gain than usual can be used then the tail rotor
is more effective, the load on the tail is also greater.
ｊ
• The rigidity of the fuselage tail has a large effect on gyro per
formance.
torsion performance for the tail drive.
Take the strength of the tail into account during inspection and adjustment.
Always perform proper maintenance for ultimate per-
formance.
-
-
Make the fuselage vibration as small as possible.
ｊ
• Fuselage vibration has an adverse affect on gyro operation.
7
EFORE USE
B
B
EFORE
Set Contents
After unpacking the GY520 set, first check if the following
parts are provided:
U
SE
GY520
Sensor tape
(2mm and 3mm thick)
Mini screwdriver
Damping plate
8
Connection cord(Black/Red)
Servo (x1): (Only a set w/servo)
EFOREUSE
B
S9254 or BLS254
S9257
*Servo horn etc. are supplied at a set w/servo.
9
EFORE USE
B
Name and Function of Each Part
Monitor LED
• Indicates the
operating state
and setting state.
(Blue, red, violet/
steady light, blinking)
Button switch
• Used to set the GY520
operating parameters.
• When operating the
button, always use the
accessory miniature
screwdriver and do not
use excessive force.
(Output connector)
Rudder
servo
connection
(Connector box)
sensitivity
• Use the accessory connection
cord to connect the receiver to
the connector box.
10
(Left)
Gyro
input
(Receiver connector)
(Right)
Rudder
input
EFOREUSE
B
Monitor LED display
The monitor LED displays the gyro's operating state.
Operation State LED display
No servo pulse/sensor
error
Warm-up
Starting
Sensor initialization
Red Slow blink
Blue Slow blink
Blue Fast blink
Operating
Normal mode (gyro stat
ic)
AVCS mode (gyro static)
At the neutral offset in the
AVCS mode (gyro static)
Gyro rotating clockwise
(depending on the install
ing direction)
Gyro rotating counter
clockwise (depending on
the installing direction)
-
-
-
Blue On
Red On
Violet Slow blink
Blue Fast blink
Red Fast blink
11
EFORE USE
B
GY520 Operation
The GY520 is used by switching between Normal mode operation and AVCS mode operation from the transmitter. (See p28
for a description of the operation mode and sensitivity setting
method.)
The differences between the operation modes are shown in the
table below.
Operation
mode
Normal mode
AVCS mode
The GY520 operates with the angle correction function
in the OFF state. When the helicopter is moving forward
a weathervaning effect appears as a special feature.
An integration function is added and the angle correction
function is turned on. As a special feature, the model
stubbornly holds its position even in a side wind while
moving forward and backward.
Operation
GY520 initialization
When the power is turned on, the interior of the GY520 is automatically initialized. When the rudder servo operates four times
between right and left, the initialization is completed. When the
power is turned on in the AVCS mode, the AVCS mode operation
reference data (rudder neutral position) is updated. Therefore, always pay attention to the following when turning on the power.
CAUTION
ｎ
(Caution at power ON)
Do not move the helicopter and rudder stick for
ｊ
• When the power is turned on, the interior of the GY520 is au
tomatically initialized. Do not move the helicopter and rudder
stick until the LED of the GY520 lights red or blue.
about 5 minutes after the gyro power (shard with the
receiver) is turned on.
12
-
EFOREUSE
B
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 returned 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 AVCS mode operation and is not
an abnormality. In actual Àight, the gyro constantly monitors
movement of the tail and controls the servo so that movement
of the tail is stopped.
Rudder linkage neutral position;
When Àown in the AVCS mode, the GY520 automatically trims the
rudder even if the rudder linkage change slightly and linkage changes
are dif¿cult to judge. However, for the gyro to operate at peak performance, it is important that the servo horn be perpendicular to the
linkage rod when the rudder servo linkage is in the neutral position.
For this reason, adjust the linkage by initially Àying in the Normal
mode and taking the rudder neutral position. Adjust the linkage without using transmitter rudder as much as possible and adjust the pitch
angle of the tail rotor so that the rudder is in the neutral position when
the servo horn is perpendicular to the linkage rod. This position is the
rudder neutral reference position in the AVCS mode.
There are the following two methods of reading this neutral reference
position to the gyro:
Methods of reading the AVCS neutral reference position
Operate the Normal/AVCS mode selector switch 3 times
Method (1)
within 1 second and set it to the AVCS mode side. The
position of the rudder stick at this time is memorized at the
gyro.
Method (2)
Turn on the gyro power in the AVCS mode. The rudder
stick position at this time is memorized at the gyro.
13
EFORE USE
B
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.
Move the rudder stick 3 times to its full stroke to the left
Neutral
position
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.
CAUTION
ｎ
Never use the transmitter rudder trim in the AVCS
ｌ
• When the rudder is trimmed during flight, the neutral position
will change.
ｊ
ｊ
mode.
When using the GY520 in the AVCS mode, set revolu-
tion mixing to OFF.
When the rudder neutral position was changed by
the linkage, the rudder neutral position in the AVCS
mode must always be re-read before use.
14
NSTALLATION AND ADJUSTMENT
I
I
NSTALLATION AND
A
DJUSTMENT
Install and adjust the GY520 as described below.
Installing to Fuselage
Installing the gyro
[IMPORTANT] Install the sensor so
GY520
Sensor tape (Use the
accessory sensor tape.)
(Fuselage gyro bed)
that the bottom of the gyro is perpendicular to the main shaft axial direction.
Offset of this axis will also react in the
roll and pitch directions.
[IMPORTANT] The gyro sensor is very
sensitive to vibration. Adjust it so that
helicopter vibrations are minimal. In
addition, provide a margin when securing the cable coming from the gyro
body.
[Gyro handling precautions]
* Always use the accessory sensor tape and install the gyro to the center
(vertical and horizontal equal) of the sensor tape. This tape is designed
to effectively absorb the vibrations from the helicopter.
* Use a cleaner to wipe off oil from the bottom and fuselage mounting
surfaces of the sensor.
* The sponge may tear near the corners of the sensor tape depending
on the use. If the helicopter is flown in this state, vibrations may not be
sufficiently absorbed and the sensor may fall off. Before flight, always
check the sensor installation state. If the sponge is torn, replace it.
* When twitching of the tail caused by vibra
tion of the fuselage cannot be suppressed,
install the accessory damper plate by sand
wiching it between pieces of sensor tape.
-
-
Sensor tape
(Use the accessory
sensor tape.)
15
Damper plate
(Use the accessory
damper plate.)
NSTALLATION AND ADJUSTMENT
I
CAUTION
ｎ
Do not strike the gyro body against a hard object or drop
ｌ
• The gyro sensor is vulnerable to shock and may be damaged
by strong shock.
the gyro onto a concrete or other hard floor surface.
Vibration
The gyro sensor used is called a vibration gyro. Its construction is
such that a microscopic moving part on a silicon wafer is vibrated
and the Coriolis force generated is sensed and the angular speed is detected. Therefore, it is intrinsically sensitive to extraneous vibration.
It is affected more by X, Y, and Z axes linear vibrations than yaw axis
revolving vibration. If the applied vibration exceeds the sensor's allowable value, gyro operation will be affected and the tail will quiver
or twitch.
The helicopter generates vibrations over a wide frequency range,
from basic engine vibration (200Hz at 12,000) to several thousand kilohertz. Vibrations up to several hundred hertz are visible to the eye.
High frequency vibration may cause the gyro to operate erroneously
even if visible vibration is not generated.
Always use the excellent vibration absorption sponge tape supplied to
mount the GY520. Two kinds of sponges matched to the fuselage are
provided. Use of the 2mm thick sponge is affective for electric helicopters, etc. and use of the 3mm thick sponge is affective when the
fuselage vibration of gasoline engine helicopters, etc. is large.
Install using one piece of sponge tape at the center on the helicopter
gyro mount.
Effective damping of vibrations is possible in this state, but if the tail
quivers or twitches, the gyro may be affected by vibrations. Basically, countermeasures must be taken against the source of vibrations
generated by the helicopter. The damping effect can also be increased
by mounting the gyro by sandwiching the accessory damping plate
between 2 pieces of sponge tape.
Two types of sponge tape are supplied; 2mm and 3mm thick. The
3mm sponge tape has a better shock absorption effect than the 2mm
sponge tape. Select and use the tape matched to the fuselage.
16
NSTALLATION AND ADJUSTMENT
I
Connection method
Connect the GY520, receiver, and servos as shown below.
• Connect the sensitivity setting channel
output of the receiver to the sensitivity
input of the connector box using the ac
cessory connection code (red).
• Connect the rudder channel output of the
receiver to the rudder input of the connec
tor box using the accessory connection
code (black).
(Red)
(Servo)
-
-
(Black)
To receiver
Servo
output
WARNING
ｎ
Insert the connectors fully and firmly.
Connec-
(
tor box
Sensitivity
input
(red)
)
• Accessory connection cord
Rudder
input
(black)
ｊ
• If a connector works loose due to vibration during flight, con
trol may be lost and result in a dangerous situation.
CAUTION
ｎ
-
Always set the mode matched to the type of servo to
ｊ
• The GY520 is compatible with digital (1520μS and 760μS)
servos. However, the mode matched to the type of servo must
be selected.
may malfunction or the servo may be damaged.
be connected to the GY520. (Servo selection function
p.24)
If the GY520 is operated in the wrong mode it
17
NSTALLATION AND ADJUSTMENT
I
Initialization
Before adjusting the linkage, make the settings and checks described in "GY520 Initialization", "Gyro Sensitivity Initialization", and "Transmitter Setting Check" below.
GY520 Initialization
Set the following GY520 operating parameters in advance. For
a description of the setting method, see "GY520 Operating Parameters Setting" (p.23).
[F3C/3D mode setting]
• When delicate rudder operation is necessary, select the F3C mode
and when you want to react to rudder stick operation more sensitively,
select the 3D mode.
[Servo selection]
• Select the mode matched to the type of servo to be connected to the
GY520.
When using a BLS254/S9254/S9257/S9253, select the digital 1520μS
mode, when using a BLS251/S9256/S9251, select the digital 760μS
mode, and when using an analog servo, select the analog servo mode.
[Response setting]
• For a 3D aerobatic helicopter or a small helicopter, optimize control
by selecting the high speed mode. For a large scale helicopter and tail
heavy fuselage, optimize control by selecting the low speed mode. Se-
lect the optimum value during flight.
Gyro Sensitivity Initialization (Tentative setting)
Set the gyro sensitivity at the transmitter. For a description of
the setting method, see the "Gyro Sensitivity Setting" (p.28)
item.
Tentatively set the sensitivity when hovering and in Àight to the
following values:
• Hovering: 70% (both AVC and NOR)
• Flight: 40% (both AVC and NOR)
18
NSTALLATION AND ADJUSTMENT
I
Transmitter Settings Check
Check the transmitter settings in the AVCS mode. Check that
the transmitter is not set so that the neutral position has shifted.
[Transmitter setting]
• Set all rudder mixings to INH.
• Set all hovering and flight rudder trims to the same position.
• Set the rudder steering angle to 100% under all conditions.
• Also set the T14MHz, etc. condition delay function to INH.
The neutral offset in the AVCS mode can be checked at the
GY502 LED. When the LED is slowly blinking violet, neutral
offset is present.
Linkage Adjustment
Adjust the linkage as described below.
* Perform initial linkage adjustment in the Normal mode. In this case, make
adjustments mechanically. Make trim adjustments at the transmitter as
small as possible.
Rudder Servo Linkage Check
• In the rudder neutral position, connect the linkage at the position at
which the servo horn and the tail control rod are perpendicular.
Perpendicular
Tail control rod
• Set the servo horn length based on
the helicopter manufacturer's instructions.
Move the rudder stick to the right
and left and check the direction of
operation of the tail rotor. If the tail
rotor turns in the wrong direction, reverse the direction using
the transmitter reverse function.
19
NSTALLATION AND ADJUSTMENT
I
Gyro operation direction check
If the rudder gyro moves to the right when the nose of the helicopter moves to the right, the gyro direction is correct.
• If the rudder servo moves in the opposite direction, switch the direction
using GY520 reverse setting (p.24).
CAUTION
ｎ
Always check the gyro operation direction.
ｊ
• If you try to fly the helicopter while the gyro direction is incor
rect, the helicopter will yaw in a fixed direction and create a
very dangerous situation.
-
Limit setting
Set the rudder servo operation limit angle at which the servo
horn does not strike the linkage.
• For a description of the adjustment method, see "GY520 Limit Setting"
(p.25).
• When flying, the servo horn does not move beyond this angle, thus pro
tecting the linkage. However, if the setting is too low, the gyro character
istics will be affected.
• At limit setting, only the stick operates. The gyro does not operate.
-
-
20
NSTALLATION AND ADJUSTMENT
I
Flight Adjustments
In the AVCS mode, turn on the transmitter power and
1
then turn on the receiver power. This initializes the GY520
and simultaneously reads the AVCS mode reference data
(rudder neutral).
• Do not move the helicopter or rudder stick until the GY520 LED lights
red (approximately 5 seconds).
Hover in the Normal mode and adjust the rudder neu-
2
tral position.
• In the AVCS mode, the rudder neutral position is automatically set and
linkage changes cannot be verified. First, perform rudder neutral position adjustment in the Normal mode.
• If the rudder servo neutral position has changed considerably, readjust
the linkage.
After rudder neutral position adjustment in the Normal
3
mode is complete, update and memorize the AVCS mode
memory as described below. This memorized data be
comes the neutral position reference in the AVCS mode.
If rudder trim was changed, don't forget to update the
memory.
• In the AVCS mode, turn on the power or operate the AVCS mode
switch 3 times within 1 second and set it to the AVCS mode. The rudder stick position at this time is memorized at the gyro.
Adjust the sensitivity to the position at which hunting
4
does not occur during hovering and flight.
-
• Since the GY520 has an extremely fast response, hunting almost never
occurs. Adjust the sensitivity while observing the pirouette and stall
turn stopping conditions, etc.
Adjust the hovering and flight rudder effect using the
5
transmitter's D/R or AFR function.
21
NSTALLATION AND ADJUSTMENT
I
• Do not perform adjustment using the END POINT (ATV) function. If the
END POINT (ATV) function is used, trimming may change.
This ends basic adjustments.
Pirouette speed
The pirouette speed of a helicopter is completely controlled in accordance with the amount of rubber control. For 100% rudder operation amount, the pirouette speed is set to approximately 450deg/sec
(at 100% gyro sensitivity) in the F3C mode and to 720deg/sec in the
3D mode. In addition, in the F3C mode, the setting is such that the
pirouette speed increases as the gyro sensitivity decreases so that the
hovering and Àight pirouette speeds change automatically.
The dynamic range (controllable range) of the gyro sensor is adjusted
to approximately 800deg/sec. Therefore, when the rudder operation
amount exceeds this dynamic range, the helicopter enters the full
pitch state and pirouettes at ultra high speed. Be especially careful in
the 3D mode because the pirouette speed is set to a high speed and
the helicopter will enter this state when the rudder operation amount
exceeds 110%. The rudder operation amount can be set using the
AFR, DR, and END POINT (ATV) functions of the transmitter.
22
ESCRIPTION OF FUNCTIONS
D
D
ESCRIPTION OF
F
UNCTIONS
GY520 Operating Parameters Setting
Set the GY520 operating parameters after switching from the Normal mode to the Setting mode. There are 6 setting items in all.
[Switching to the Setting mode]
Press the GY520 button for about 3 seconds (until the violet LED lights
•
momentarily). The GY520 is switched to the following Setting modes.
[Setting mode]
(Parameter) (Setting) (LED display)
Digital 1520μS servo* Blue 1 blink
1. Servo selection
Digital 760μS servo Red 1 blink
2. Reverse setting
3. Limit setting
4. F3C/3D mode setting
5. Response setting
6. Data reset
Analog servo Violet 1 blink
Normal* Blue 2 blinks
Reverse Red 2 blinks
(Servo operation limit setting)
F3C mode* Blue 4 blinks
3D mode Red 4 blinks
Reference* Blue 5 blinks
Fast Red 5 blinks
Slow Violet 5 blinks
(Resets settings (1)-(5).) Blue 6 blinks
*: Initial setting
Blue 3 blinks
[Setting item switching]
• Press the button for about 2 seconds (until the violet
LED lights momentarily). The setting item is switched.
23
ESCRIPTION OF FUNCTIONS
D
1. Servo selection [LED 1 blink]
Selects the mode matched to the type of servo connected to the
gyro. Use a Futaba gyro dedicated servo.
• Compatible with 3 types of servo.
• The gyro operates at top performance when used with a digital 760μS
servo.
CAUTION
ｎ
Always set the mode matched to the type of servo
ｊ
• If operated in the wrong mode, the gyro may malfunction or
the servo may be damaged.
connected to the gyro.
Setting LED state Servo type selection method
Digital 1520μS
servo*
Digital 760μS
servo
Analog servo Violet 1 blink
*: Initial setting
Compatible servos:
Digital 1520μS servo: BLS254, S9254, S9257, S9253
•
Digital 760μS servo: BLS251, S9256, S9251
•
Analog servo: All analog servos
•
Blue 1 blink
Red 1 blink
1. Press the button and set to the LED
fast blinking state. (Fast blinking stops
in about 1 second.)
2. When the button is momentarily
pressed again in the LED fast blinking
state, the setting is switched.
2. Reverse setting [LED 2 blinks]
Sets the gyro operation direction. Set the operation direction so
that when the nose of the helicopter is moves to the right, left
correction rudder is applied and when the nose of the helicopter
is moves to the left, right correction rudder is applied.
24
WARNING
ｎ
Always check the gyro operation direction.
ｊ
ESCRIPTION OF FUNCTIONS
D
• If you try to fly the helicopter while the gyro direction is incor
rect, the helicopter will yaw in a fixed direction and create a
very dangerous situation.
Setting LED state
Normal* Blue 2 blinks
Reverse Red 2 blinks
*: Initial setting
Method of changing gyro operation direction
1. Press the button and set to the LED
fast blinking state. (Fast blinking stops
in about 1 second.)
2. When the button is momentarily
pressed again in the LED fast blinking
state, the setting is switched.
3. Limit setting [LED 3 blinks]
Sets the rudder servo operation limit angle. Adjust the angle
after mounting the servo to the fuselage.
Servo operation limit setting method
1.Blinking of the LED 3 times indicates that the gyro is in the limit setting
mode. When the button switch is pressed once, the LED blinks rapidly
and the gyro enters the single-side (PWM signal wide side) setting
mode. The servo operates up to the memorized limit position.
2.When the rudder stick is moved to the left and right during this adjust
ment, the servo deflection angle is increased and decreased. When the
button switch is momentarily pressed once when the rudder servo is
in the position at which the rudder linkage does not strike a stopper or
any part of the fuselage, that position is memorized. The LED momen
tarily lights violet. To complete setting, move the servo to the position
to be memorized at the other (narrow) side. Move the rudder stick to
the left and right and set the limit position the same as the setting de
scribed above.
When setting is complete, the LED will blink 3 times.
3.In this state, move the rudder stick and check if the limit positions are
normal. (The servo operating angle moves 1.5 times the movement of
the stick.) If there is any offset, press the button switch and repeat set
ting in both directions.
-
-
-
-
25
ESCRIPTION OF FUNCTIONS
D
Note1: If setting the limit position to 50% or less of the servo operating
angle is attempted, an error will occur. When the color of the LED is
red, the operating angle is 50% or less. Limit setting is possible at the
position at which the LED lights blue.
Note2: Before setting the limit position for the first time, disconnect the
linkage rod from the horn to protect the rudder linkage.
4. F3C/3D mode setting [LED 4 blinks]
Sets the gyro operation mode (Àight mode). Set the F3C mode
when delicate rudder operation is necessary. In the 3D mode,
rudder stick operation reacts more sensitively.
Setting LED state
F3C mode* Blue 4 blinks
3D mode Red 4 blinks
*: Initial setting
Method of changing gyro operation direction
1. Press the button and set to the LED
fast blinking state. (Fast blinking stops
in about 1 second.)
2. When the button is momentarily
pressed again in the LED fast blinking
state, the setting is switched.
5. Response setting [LED 5 blinks]
Sets the helicopter tail response. Generally, the tail response
of 3D aerobatic helicopters and small helicopters is fast. Conversely, the tail response of large scale helicopters and tail
heavy helicopters is slow. Response setting optimizes control
by matching gyro control to the tail response of the helicopter.
• The response can be set in 3 steps. Select the best value by flight adjustment.
Setting LED state
Reference* Blue 5 blinks
Fast Red 5 blinks
Slow Violet 5 blinks
*: Initial setting
Method of changing gyro operation direction
1. Press the button and set to the LED
fast blinking state. (Fast blinking stops
in about 1 second.)
2. When the button is momentarily
pressed again in the LED fast blinking
state, the setting is switched.
26
ESCRIPTION OF FUNCTIONS
D
6. Data reset [LED 6 blinks]
Returns the gyro settings to their initial state. After data reset,
set each parameter again.
Reset method
1. Press the button momentarily. The LED blinks fast. (Fast blinking stops
in about 1 minute.)
2. In the LED fast blinking state, press the button 3 times. The LED color
changes to violet and the data is initialized.
The setting item return to the Servo Selection automatically.
The initial states are:
Parameter Initial state
1. Servo selection Digital 1520μS
2. Reverse setting Normal
3. Limit setting Right, left 420μS
4. F3C/3D mode F3C mode
5. Response setting Reference
When returning to the Normal mode at the end of parameters
setting, cycle the receiver and gyro power.
27
ESCRIPTION OF FUNCTIONS
D
Gyro Sensitivity Setting
The ¿gure below shows the relationship between the GY520
gyro sensitivity and the transmitter gyro sensitivity channel
pulse width.
At the neutral position the sensitivity becomes zero and enters
the AVCS mode side at the + pulse width side and the Normal
mode side at the - pulse width side. The sensitivity becomes
100% when the pulse change width is 500ȝS.
Normal side AVCS side
100%
50%
Sensitivity
0%
-500μS +500μS
• The newest FUTABA transmitters with gyro sensitivity setting function
make AVCS/Normal mode setting and sensitivity setting easy.
For transmitters without a gyro sensitivity setting function, connect the
sensitivity setting connector to a vacant switch channel and set the
gyro sensitivity using the END POINT (ATV) function of that channel. At
100% ATV, the sensitivity becomes approximately 100%. (For FUTABA
transmitter)
• Optimum sensitivity is the position just before the tail of the helicopter
starts hunting. Make adjustments during actual flight.
For a 90 class helicopter, the sensitivity criteria is hovering: 70-100%
and idle up: 30-60%. For small helicopters with a high tail sensitivity,
Neutral
Pulse width
the optimum sensitivity of the gyro is a low setting.
The sensitivity adjustment method is different depending on the
transmitter used. Refer to the setting examples shown below.
28
ESCRIPTION OF FUNCTIONS
D
When using T14MZ/T12Z/T12FG transmitter
Use the gyro mixing function to set the sensitivity and mode
for each condition used.
• Up to 3 sensitivities can be set for each flight condition
[Transmitter Setting]
Set the gyro rate in both directions to 100% at the
1
END POINT (ATV) setup screen.
Call the GYRO screen and set the sensitivity and
2
mode for each condition.
Setting example;
• Adjust 70% (both AVC and NOR) as the reference when hovering and
40% (both AVC and NOR) as the reference during flight.
The following setting example uses SW-A to switch between
AVCS70% (rate 1) and NOR70% (rate 2).
T14MZ
• Enables only the number of
functions used by the current
condition.
• Selects the rate switches and
sets the ON direction when
2 or more sensitivities are
used.
(Normal condition screen)
• Select "GY" as the gyro
type.
• Mode selection (AVCS or NOR) and
sensitivity adjustment
29
ESCRIPTION OF FUNCTIONS
D
T12Z
• Enable only the number of functions you want to use with the
current condition. (Figure below: 1 rate and 2 screens)
When using 2 or more sensitivities, perform switch selection
and ON direction setting at each rate screen.
(Normal condition screen)
• Selects "GY" as the
gyro type.
T12FG
• Enable only the number of functions you want to use with the
current condition. (Figure below: 1 rate and 2 screens)
When using 2 or more sensitivities, perform switch selection
and ON direction setting at each rate screen.
• Mode selection (AVCS or NOR) and
sensitivity adjustment
(Normal condition screen)
• Selects "GY" as the
gyro type.
• Mode selection (AVCS or NOR) and
sensitivity adjustment
30
ESCRIPTION OF FUNCTIONS
D
When using a T10C/T9CS/T7C transmitter
Use the gyro mixing function to set the sensitivity for each condition.
[Transmitter setting]
Set the 5ch (gyro sensitivity) rate of both directions to
1
100% using the END POINT setup screen.
Call the GYRO SENS setup screen and set the sensi-
2
tivity for each condition.
Setting example;
• Adjust 70% (both AVC and NOR) as the reference when hovering and
40% (both AVC and NOR) as the reference during flight.
The following setting example shows the sensitivity set to
AVCS70% for normal conditions and to AVCS40% for other
conditions.
T10C
• Sets the gyro mode
• Sets the function to "ACT".
to "GY".
• Sets the mode (AVC or
NOR) and sensitivity of each
condition
31
• Selects "Cond."
as the switch.
ESCRIPTION OF FUNCTIONS
D
T9CS
• Sets the function to "ACT".
• Selects "Cond."
as the switch.
• Sets the gyro mode
to "GY".
• Sets the mode (AVC or
NOR) and sensitivity of each
condition
T7C
• Sets the function to "ACT".
• Sets the gyro mode
to "GY".
• Selects "E" as
the switch.
• Sets the mode (AVC or
NOR) and sensitivity of each
condition
32
ESCRIPTION OF FUNCTIONS
D
When using a T6EX transmitter
Use the gyro mixing function to set the sensitivity of each direction of the gyro switch.
[Transmitter setting]
Set the 5ch (gyro sensitivity) rate of both directions to
1
100% using the EPA setup screen.
Call the GYRO setup screen and set the sensitivity for
2
each direction of the switch.
Setting example;
• Adjust 70% (both AVC and NOR) as the reference when hovering and
40% (both AVC and NOR) as the reference during flight.
The following setting example shows the sensitivity set to
AVCS70% for up side and to Normal70% for down side.
T6EX
• Sets the function
to "ON".
Transmitter
rate setting
(Up side) (Down side)
• Sets the mode (AVC or Normal) and
sensitivity of each direction of the
switch
-100% 0% +100%
GY520
Operation
Mode
Gyro
Sensitivity
33
Normal
Mode
100% 0% 100%
AVCS
Mode
ESCRIPTION OF FUNCTIONS
D
T9Z (world champion model) transmitter
Use the GYRO SENSE function to set the mode and sensitivity
for each condition used.
• Two sensitivities can be used for each flight condition.
[Transmitter setting]
Set the 5ch (GYR) rate of both directions at the ATV
1
setup screen.
Call the GYRO SENS screen.
2
Select "DUAL" mode (DUO).
3
Set the sensitivity by adjusting the "GAIN1" and
4
"GAIN2" rates.
Transmitter
rate setting
GY520
Operation
Mode
Sensitivity
Gyro
GAIN1
GAIN2
0% 50% 100%
Normal
Mode
100% 0% 100%
AVCS
Mode
For steps 2-4, see the setting example on the next page.
34
ESCRIPTION OF FUNCTIONS
D
Setting example;
• The example shown below uses a switch to switch the
AVCS70%(GAIN1) and Normal70%(GAIN2) modes and sensitivities at
each normal condition.
• Selects "DUAL" mode.
• Sets the sensitivity.
Switches GAIN1 and GAIN2 by switch.
• Adjust the setting of each condition during hovering and flight by making the values shown below the reference. (Example when used by
switching the AVCS and Normal mode sensitivities by switch)
Sensitivity
Switch
AVCS side
GAIN1
Normal side
GAIN2
（Actual sensitivity）
Sensitivity
when hovering
85%
15%
70% 40%
Sensitivity
in flight
70%
30%
The GAIN1 and GAIN2 set values are the AVCS mode setting above
50% and the Normal mode setting below 50%.
35
ESCRIPTION OF FUNCTIONS
D
When transmitter without dedicated mixing used
When the transmitter does not have a dedicated mixing function for GY gyro, use a vacant channel to set the sensitivity.
Connect the GY520 gyro sensitivity input to the corresponding
channel.
Adjust the AVCS side and Normal side sensitivity using the
END POINT (ATV) function.
[Transmitter setting]
Call the END POINT (ATV) function.
1
Set the sensitivity by adjusting the rate of the sensitiv-
2
ity setting channel.
(Pushed back)
(Pulled forward)
End point (ATV)
rate
GY520
operation mode
Gyro
sensitivity
* However, sensitivity setting by END POINT (ATV) function may have a
range over which setting is impossible. Check the END POINT (ATV)
setting range of the transmitter used.
* The actual sensitivity of the GY520 depends on the transmitter used.
Setting example;
• Adjust 70% (both AVC and NOR) as the reference when hovering and
40% (both AVC and NOR) as the reference during flight.
100%
100%
Normal
mode
0% 100%
AVCS
mode
0% 100%
36
R
EFERENCE
Specifications
* Specifications are subject to change without prior notice.
GY520 Ratings
• Yaw-axis stabilizer for helicopter (rate gyro)
• Control system: Advanced PID control
• Sensor: MEMS vibrating structure gyro
• Angular velocity range: ±800 deg/sec
• Operating voltage range: DC 3.8V to 6.0V
• Current drain: 40mA (excluding a servo)
• Operating temperature: -10°C - +45°C
• Dimensions: 20.8 x 20.8 x 11mm
• Weight: 8g
EFERENCE
R
(Suggested servo for use with your GY520)
S9254 Ratings
(Digital 1520μS servo)
• Dimensions: 40 x 20 x 36.6mm
• Weight: 49g
• Speed: 0.06sec/60° (at 4.8V)
• Torque: 3.4kg·cm (at 4.8V)
BLS254 Ratings
(Digital 1520μS/brushless servo)
• Dimensions: 40 x 20 x 36.8mm
• Weight: 61g
• Speed: 0.06sec/60° (at 4.8V)
• Torque: 3.8kg·cm (at 4.8V)
S9257 Ratings
(Digital 1520μS servo for EP helicopter)
• Dimensions: 35.5 x 15 x 28.6mm
• Weight: 26g
• Speed: 0.08sec/60° (at 4.8V)
• Torque: 2kg·cm (at 4.8V)
S9256 Ratings
(Digital 760μS servo)
• Dimensions: 40 x 20 x 36.6mm
• Weight: 57g
• Speed: 0.06sec/60° (at 4.8V)
37
EFERENCE
R
• Torque: 3.4kg·cm (at 4.8V)
BLS251 Ratings
(Digital 760μS/brushless servo)
• Dimensions: 40 x 20 x 36.8mm
• Weight: 61g
• Speed: 0.06sec/60° (at 4.8V)
• Torque: 3.8kg·cm (at 4.8V)
38
EFERENCE
R
Repair Service (in U.S.A.)
If any dif¿culties are encountered while setting up or operating
your GY520, please consult this instruction manual ¿rst. 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 below:
https://www.futabausa.com
Phone:1-256-461-9399 FAX:1-256-461-1059
If you are unable to resolve the issue, pack the system in its
original container with a note enclosed and a thorough, accu-
rate description
of the dif¿culty. Include the following in your
note:
•
Symptoms (Including when the problem occurred)
• System (Transmitter, Receiver, Servos and model numbers)
• Model (Model name)
• Model numbers and quantity
• Your Name, Address and Telephone number
Send the respective items to the authorized Futaba Service
Center address below:
)87$%$&RUSRUDWLRQRI
$PHULFD
:DOO7ULDQD+Z\
+XQWVYLOOH$/86$
39
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