FUTABA GY501 Instruction Manual
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FUTABA GY501 Instruction Manual

FUTABA GY501 Instruction Manual

Rate gyro avcs - yaw-axis stabilizer for model helicopter
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AVCS GYRO
GY501
I
M
NSTRUCTION
ANUAL
YAW-AXIS STABILIZER FOR MODEL HELICOPTER
(RATE GYRO)
1M23N04302

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Summary of Contents for FUTABA GY501

  • Page 1 AVCS GYRO GY501 NSTRUCTION ANUAL YAW-AXIS STABILIZER FOR MODEL HELICOPTER (RATE GYRO) 1M23N04302...
  • Page 2 AVCS GYRO GY501 NSTRUCTION ANUAL YAW-AXIS STABILIZER FOR MODEL HELICOPTER (RATE GYRO)
  • Page 3 •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.

  • Page 4: Table Of Contents

    - Fuselage Maintenance Precautions ------------------------- 10 BEFORE USE - Set Contents --------------------------------------------------- 11 - Name and Function of Each Part --------------------------- 12 - Description of GY501 Operation --------------------------- 13 ASSEMBLY AND ADJUSTMENT - Connections --------------------------------------------------- 29 - Mounting the Gyro Sensor ---------------------------------- 30...

  • Page 5: For Safety

    AFETY AFETY To ensure safe use, observe the following precautions. 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 condition and cause death or serious injury to the user if not carried out properly.

  • Page 6: Setting Precautions

    If vibration, etc. causes a connector to work loose during flight, the heli may crash. Precautions When Turning on the Power Switch During initialization, the message **INIT* appears on the GY501 LCD screen. Do not move the helicopter until this message disappears (in about 5 seconds).

  • Page 7: Operating Precautions

    Or quickly switch (interval of within 1 second) the remote gain channel switch between the AVCS mode and Normal mode at least three times with the transmitter in the ON state. This memorizes the new rudder position inside the GY501. Operating Precautions Avoid sudden temperature changes.
  • Page 8 Never use the transmitter rudder trim in the AVCS mode. When the rudder is trimmed during flight, the neutral position will change. When using the GY501 in the AVCS mode, set revolution mixing to OFF.

  • Page 9: Fuselage Maintenance Precautions

    AFETY Fuselage Maintenance Precautions Mounting Precautions Use a tale rotor drive tube or other part with a high torsion performance for the tail drive. Take the strength of the tail into account during inspection and adjustment. The amount of improvement of gyro performance has a considerable effect on the fuselage vibration level or the size, type, linkage method, looseness, etc.

  • Page 10: Before Use

    EFORE EFORE Set Contents After unpacking the GY501 set, first check if the following parts are provided: GY501 control amp (x1) RATE GYRO CONNECT Sensor tape (x3) GY501 sensor (x1) S9205 servo (x1) (Only a set w/servo) Mini screwdriver (x1)

  • Page 11: Name And Function Of Each Part

    EFORE Name and Function of Each Part GY501 control amp LCD display Displays the set data. (8 characters X 1 line) (Input/output terminals) Gyro sensor input RATE GYRO Rudder servo output CONNECT (Receiver connectors) Edit keys Remote gain input Used when setting data.

  • Page 12: Description Of Gy501 Operation

    EFORE Description of GY501 Operation The GY501 gyro allows the operator to switch between the AVCS mode (operation using AVCS function) and Normal mode (conven- tional gyro mode) from the transmitter. Of course, the GY501 can also be used in the AVCS mode only.
  • Page 13 (The following page shows a setting example in the CMT mode.) [Sensitivity Display] The gain display indicates the actual gain at the GY501 G:1 and G:2 screen. The following shows the relationship between transmitter and gyro setting when GY501 sensitivity setting is 100% in both the G1 and G2 gain modes.
  • Page 14 Actual gain The GY501 sensitivity is 0% at 50%. When set over 50%, the GY501 operates in the AVCS mode and when set under 50%, the GY501 operates in the Normal mode. When setting is changed 1%, the gyro...
  • Page 15 (The following page shows a setting example in the CMT mode.) [Sensitivity Display] The gain display indicates the actual gain at the GY501 G:1 and G:2 screen. The following shows the relationship between transmitter and gyro setting when GY501 sensitivity setting is 100% in both the G1 and G2 gain modes.
  • Page 16 Use the following values as the sensitivity setting standard: Hovering Flight +40% AVCS mode +70% Normal mode -70% -40% Actual gain When set over 0%, the GY501 operates in the AVCS mode and when set under 0%, the GY501 operates in the Normal mode.
  • Page 17 (The following page shows a setting example in the CMT mode.) [Sensitivity Display] The gain display indicates the actual gain at the GY501 G:1 and G:2 screen. The following shows the relationship between transmitter and gyro setting when GY501 sensitivity setting is 100% in both the G1 and G2 gain modes.
  • Page 18 Use the following values as the sensitivity setting standard: NORM IDL1 IDL2 Hovering Flight AVCS mode Normal mode Actual gain When set over 50%, the GY501 operates in the AVCS mode and when set under 50%, the GY501 operates in the Normal mode.
  • Page 19 ATV function: Set the ATV rates at the transmitter CH5 ATV function. [Sensitivity Display] The gain display indicates the actual gain at the GY501 G:1 and G:2 screen. The following shows the relationship between transmitter and gyro setting when GY501 sensitivity setting is 100% in both the G1 and G2 gain modes.
  • Page 20 Adjust both the ATV rates to 90% at the transmitter Ch5 ATV function. [GY501 Settings] Operation Mode Setting function: Select the gyro operation mode at the GY501 Mode screen. (AVC, NOR, or CMT) Gyro Gain Adjustment function: Set the G:1 and G:2 gains at the GY501 G:x screen.
  • Page 21 EFORE Initialization When the power switch is turned on, the GY501 automatically obtains the reference signal for AVCS function correction and initializes itself. Precautions When Turning on the Power Switch During initialization, the message **INIT* appears on the GY501 LCD screen.
  • Page 22 In the normal mode, when the rudder neutral position was reset, and the GY501 was switched to the AVCS mode in this state, the neutral position will change. To correct the difference in the neutral position...
  • Page 23 EFORE the neutral trim position set in the Normal mode. This memorizes the new rudder neutral position in the GY501. When the transmitter has a function that allows trim setting for each flight condition, such as the T9Z, the AVCS mode trim position is fixed and this operation is unnecessary.
  • Page 24 EFORE Differences Between AVCS Gyro and Conventional Gyro Compared to a convention gyro, the AVCS gyro has a substantially improved tail control capacity. Gyro operation also differs from that of conventional systems in a number of ways. The following sequentially describes the conventional gyro and the AVCS gyro.
  • Page 25 The AVCS system requires a high-precision angular velocity sensor. The GY501 realizes a high-precision angular velocity detection function and extremely small output drift by using a new type of gyro sensor. This minimizes rudder neutral position drift during flight and eliminates the need to trim the rudder during flight.
  • Page 26 EFORE Differences in rudder control method The following describes the differences between conventional gyro and AVCS gyro rudder control. The conventional gyro sends the rudder control signals from the transmitter to the rudder servo and starts to move the tail. When the tail moves, the gyro detects this movement and generates a signal to stop it.
  • Page 27 EFORE In the AVCS mode, the gyro automatically trims the rudder so that linkage changes cannot be verified. Initially, the GY501 trims the rudder by flying in the Normal mode to take the rudder linkage neutral position. This centers the linkage. At this time, this rudder neutral reference point is read to the GY501.

  • Page 28: Assembly And Adjustment

    SSEMBLY AND DJUSTMENT SSEMBLY AND DJUSTMENT Connections Gyro Sensor (“GYRO”) Rudder Servo (“SX”) RATE GYRO CONNECT Rudder Channel Remote Gain Input (“RX.1-4”) (“RX.AUX”) Connect to receiver sensitivity setting channel (normally ch5). Connector Connection Insert the connectors fully and firmly. If vibration, etc. causes a connector to work loose during flight, the heli may crash.

  • Page 29: Mounting The Gyro Sensor

    SSEMBLY AND DJUSTMENT Mounting the Gyro Sensor The gyro sensor is extremely sensitive to vibrations. Always use the attached sensor tape to mount the gyro sensor. Stick the sensor tape to the center of bottom of the sensor and firmly stick the sensor to a flat part of the helicopter frame so that it does not touch the frame.

  • Page 30: Use

    (See page 42 for setting method) - To use the GY501 in the Normal mode only, set to "Nor". To use the GY501 in the AVCS mode only, set to "AVC". When switching between the AVCS mode and Normal mode, set to "CMT".
  • Page 31 - Set the sensitivity during flight to 70% and 30% in the AVCS and normal modes, respectively. - At this time, 70% is displayed on the GY501 sensitivity display when hovering and 40% is displayed on the GY501 sensitivity display during flight.
  • Page 32 3) When the transmitter rudder trim was adjusted, the rudder neutral data must be read to the GY501. Therefore, always perform the following operations: - Switch the transmitter sensitivity switch quickly (internal of within 1 second) between AVCS and Normal at least three times.
  • Page 33 - Do not adjust with the ATV function. If the ATV function is used, trimming may change. (If necessary) 6) When you sense a difference in the rudder effect between the AVCS and Normal modes, adjust using the GY501 rudder control linkage. (See page 40 for setting method)
  • Page 34 SSEMBLY AND DJUSTMENT - Adjustment using the delay function of the T9Z transmitter is also possible. Since the gyro gain also has a large effect on the stopping state, make this adjustment after adjusting the sensitivity. 8) When you want to use rudder mixing in the Normal mode, set the transmitter so that rudder mixing is applied only during Normal mode operation.

  • Page 35: Data Setting Lcd Display And Edit Keys

    ETTING ETTING LCD Display and Edit Keys LCD display Set data display and operation status monitoring are possible. Edit keys RATE GYRO Setup screen call The setup screens can be sequen- tially called with the FUNC+ or FUNC- key. For the order in which the setup screens are called, see the function map.

  • Page 36: Function Map

    ETTING Function Map Power ON Initial screen at power on (P38) Power supply voltage display (P38) FUNC FUNC ”+” key ”-” key Gyro Gain Adjustment (P39) Gyro Reverse (P39) Rudder Control Gain (P40) Control Delay (P40) Gain Tracking (P41) Servo Frame Rate (P41) Operation Mode Setting (P42)

  • Page 37: Setting Of Each Function

    ETTING Setting of Each Function Initial screen at power on This is the initial screen at power on. When the transmitter power is off, "*IDLE**" is displayed until the transmitter power is turned on. After the transmitter power is turned on, "*INIT***" blinks for about 5 seconds to read the reference data.
  • Page 38 When the rudder neutral full reset operation was per- formed, the "****" mark, which indicates execution, is displayed. In the AVCS mode, when there is a difference between the transmitter rudder neutral position and the GY501 neutral data, the " " mark is displayed. Gyro Gain Adjustment Initial value: 100% Performs gyro sensitivity adjustment.
  • Page 39 ETTING Rudder Control Gain Initial value: ACG:100%, NCG:100% Sets the rudder stick operation gain. The gain can be set indepen- dently for the AVCS mode and Normal mode. When the operation mode is AVCS, "ACGX" is displayed. In the Normal mode, "NCGX"...
  • Page 40 ETTING Gain Tracking Initial value: +0% Adjusts left and right tail stopping. It is used at 0% as standard, but use this adjustment when pirouette stopping cannot be adjusted using the CDI parameter. For example, when pirouette stopping resembles hunting, or right turn pirouette stopping drifts, shift Trk in the + direction.
  • Page 41 GY501 operates the same as conventional gyros. In the "AVC" mode, the GY501 always operates in the AVCS mode. In the "CMT" mode, the GY501 can be used in both the AVCS and Normal modes. Linkage Limit Setting Initial value: 100% Sets the rudder servo travel limit.

  • Page 42: Reference Specifications

    EFERENCE EFERENCE Specifications * Specifications are subject to change without prior notice. GY501 Ratings Yaw-axis stabilizer for helicopter (rate gyro) Display device: 8-character dot matrix liquid crystal display Operating voltage range: DC 3.8V to 6.0V Current drain: 60mA (@4.8V, including sensor)

  • Page 43: Definition Of Abbreviations

    EFERENCE Definition of Abbreviations The following defines the abbreviations and symbols used in this manual in alphabetical order. The function names are given on the description pages. ACGA/B Rudder control gain IDLE Transmitter power OFF state. (AVCS) p40 AFR function. Use inhibited state.

  • Page 44: Gy501 Parameters Sheet

    EFERENCE GY501 Parameters Sheet * Copy and use. Helicopter: Date: Initial Parameter value value Remarks G:xx 100% 0-100% Gyro Gain Adjustment 100% 0-100% GDir NOR/REV Gyro Reverse ACGA 100% 30-200% ACGx,NCGx ACGB 100% 30-200% NCGA 100% 30-200% Rudder Control Gain...

  • Page 45: Repair Service

    If you have any questions regarding this product, please consult your local hobby dealer or contact the Futaba Service Center. The address and telephone number are listed below. (For U.S.A.) (Telephone inquiries are accepted from 8:30 AM to 5:00 PM PST daily, except on Saturday, Sunday and Holidays.)

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