Futaba GYA351 User's Manual

Thank you for buying a GYA351 AVCS gyro. Before using your new gyro, please read this manual thoroughly and use the gyro properly and safely. After reading this manual, store it in a safe place.

No part of this manual may be reproduced in any form without prior permis- sion. 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.

FOREWORD1 SET CONTENTS2 The GYA351 is a high performance, compact, and light weight The GYA351 comes with the following accessories: AVCS gyro developed for model aircraft ailerons, especially two servos FLAPRON wing, control. Integrated sensor and control circuit make it easy to mount. Servos: Gyro performance largely depends on the servo used. The faster

•GYA351

and more responsive the servo, the higher the speed and the •Double-sided better the sensitivity and performance of the gyro.

tape (3 sheets)

Features •AVCS used

•Mini screwdriver

Forward, climb, descent, back, knife edge, and other flying attitudes are main-

(for adjustments)

tained even when the wind shifts. Therefore, since meeting rudder is almost completely unnecessary, flying is easy. At the same time, the gyro automatically corrects bad tendencies of the aircraft. GYA351 Ratings •SMM gyro sensor

(Integrated sensor type AVCS rate gyro)

Newly developed very low drift SMM (Silicon Micro Machine) gyro sensor

Control system:

practically eliminates trim changes during flight.

Digital advanced PI (Proportional Integration) control

•Remote gain and mode switching functions Gyro sensor: Remote gain function lets you switch the gyro gain from the transmitter. AVCS SMM (Silicon Micro Machine) system vibration gyro mode/Normal mode/Gyro OFF can also be switched from the transmitter. Operating voltage: +4 to +6VDC

•Integrated type, compact size, and light weight Dimensions: 27 x 27 x 20mm Compact size (27x27x20mm) and light weight (32g) have been achieved by the Weight: 32g (including connector) use of high density mounting technology. Functions: Gyro operation direction switch, Gyro gain trimmer, Control gain

•Conductive resin case improves EMC resistance (electrostatic,

trimmer

electromagnetic wave interference).

NAME AND FUNCTION OF EACH PART3

•Gyro gain trimmer (G GAIN) Adjusts the gyro gain. Gain adjustments are made from the transmitter. In this case,

•Monitor LED

the value set with this trimmer becomes the reference and the gain can be adjusted by

Monitors the operating status of the GYA351. See the table changing the servo deflection angle setting of the transmitter gain adjustment channel. below for the display contents. When the trimmer is turned clockwise, the gain increases. Adjust the gain to the

maximum value at which hunting does not occur.

•Gyro direction of operation selector

•Control gain trimmer (C GAIN)

switch (ch1)(DIR.A) Adjusts the steering signal controlled variable. The effect of the rudder when

the gyro is turned on can be adjusted. When the trimmer is turned clockwise,

•Gyro direction of operation selector

the controlled variable increases.

switch (ch6)(DIR.F) Selects the direction of operation of the gyro. If the servo moved when the fuselage was moved in the •Servo output con- •Gain switching connector (red) aileron axis direction and the servo moved to cancel

nector Gyro gain switching signal input connector.

this movement, the direction of operation is matched.

Connects to the receiver gain switching channel

Connects the corresponding

output connector. The signal from this connector is

If the aircraft is flown while the direction of opera- servo.

also used to switch the AVCS and Normal opera-

tion is wrong, the gyro may apply reverse rudder

tion modes simultaneously with gain switching.

and is very dangerous.

•Ch6 input connector (black) Connects to ch6 servo output connector of the receiver.

(Monitor LED display)

•Ch1 input connector (black)

LED display Gyro operation status

Connects to ch1 servo output connector of

Rapid flashing Displayed while data is being initialized at power ON. the receiver. Steady light Shows that the gyro is operating in the AVCS mode.

GYA351 operation modes

Off Shows that the power is OFF, or the gyro is operating

The GYA351 has two operations modes: AVCS mode and Normal mode.

in the Normal mode.

Slow flashing Displayed when a control signal is input from the transmitter. Normal mode

At this time, the servo does not operate. This mode performs general proportional control operation. For instance, it controls the gyro

Double flash In the AVCS mode, displayed when the signal from the so that changes are countered when the attitude of the aircraft is changed by cross-wind, etc.

transmitter deviates from the neutral signal memorized

AVCS mode

at the gyro. Also displayed when a stick is operated.

This mode performs both proportional and integrated control operation The difference

Single flash Displayed when the AVCS function is reset, and a neutral signal

between Normal mode and AVCS mode operation is that whereas the Normal mode only

is sent to the servo. The LED flashes once when the gain

counters changes in attitude, the AVCS mode returns to the original controlled variable

selector switch was quickly switched between the Normal and

simultaneously with countering changes in attitude. For example, during knife edge flying,

AVCS positions three or more times and then left in the AVCS

aileron and elevator meeting rudder is normally necessary, but in the AVCS mode, meeting

position, or when a transmitter stick was quickly moved to the

rudder is performed automatically by the gyro.

left and right three or more times. After this display is per

formed, the servo moves to the neutral position. This display Also, in the AVCS mode, high-speed control is possible, but when the usage method is also flashes when the operation direction or control selector incorrect, unintended operation may be performed. Before use, gain a thorough understand- switch was moved. ing by reading the Usage Precautions and Operation Instructions.