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
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