Agilent AEAS-72AA-xxxAA Absolute Encoder Data Sheet Features • Gray code • High or low power source options • IP 50 rating • 38 mm package diameter • 8 bits resolution • 6 mm shaft diameter • The package comes with 0.5 m long cable Description The AEAS-72AA-xxxAA absolute encoder is a feedback device that has the capability to generate a unique binary ‘word’ for each encoder shaft position. The AEAS72AA-xxxAA also has the unique feature of being able to provide positional information upon power up without the need for codewheel movement, unlike incremental encoders, which need codewheel movement to provide positional information. Each absolute encoder from the AEAS-72AA-xxxAA consists of a lensed LED (Light Emitting Diode) source, an integrated circuit with detectors and output circuitry, and a special multi-track glass codewheel that rotates between the emitter and detector IC. These 3 main components are contained within a strong metal housing fitted with bearings to produce an IP rated encoder capable of working in dusty conditions. Applications • Tool changers and axis control for machine tools • Robotics • Telescopes and antennas • Rotary and X - Y positioning tables • Medical scanners Package Dimensions 5.5 ± 0.2 5 ± 0.1 12 ± 0.3 12 38 MODEL NAME PLATE ∅6h7 0° A 12 ° ±1 0° ± ∅20h7 10 ± 0.2 ∅38 ± 0.2 1° A 3-M3 DEPTH 5 P.C.D28 ZERO ADDRESS POSITION TOLERANCE ± 5° 7 10 ABSOLUTE ENCODER PART No: AEAS-72AA-XXXAA SERIAL No: XX-XXX MADE IN JAPAN CONNECTIONS BLU RED +*~*V BLK OV.COM VLT GRA BRN 20 WHT ORN 21 SHIELD YEL 22 GRN 23 TOLERANCE IS ± 0.5 mm UNLESS OTHERWISE SPECIFIED. TYPICAL DIMENSIONS IN MILLIMETERS. 24 25 26 27 FG JIS (JAPANESE INDUSTRIAL STANDARD) DEFINITION (mm) 20h7 6h7 NOTE: INFORMATION FROM JIS B0401(1999) 2 +0 -0.021 +0 6 -0.015 20 Theory of Operation The AEAS-72AA-xxxAA is a singleturn, low-cost, and compact absolute encoder which uses optical technology to provide absolute positioning information. The AEAS-72AA-xxxAA consists of a LED, Fixed Slit, Codewheel (Rotating Disc) and Photodiode IC. By using these four main components, the AEAS-72AA-xxxAA is able to produce signals in either binary or gray output form. These signals provide to the designer a unique code for each position that the codewheel is in. As seen in the diagram, the encoder contains a single Light Emitting Diode (LED) as its light source. The light is collimated into a parallel beam by means of a lens which is built into the LED housing. This parallel beam goes through the Fixed Slit that creates a certain light pattern, due to its pattern of slots, which will fall onto the code-wheel. The movement of the code-wheel between LED and Photo detector, causes the light pattern (from the Fixed Slit) to be further interrupted by the pattern of spaces and bars on the codewheel. This final light pattern from the codewheel is then detected by the Photodiode IC where its signals are fed through signal processing circuitry to produce 8 or 10 parallel signals in binary or gray output form. FIXED SLIT LED PHOTODIODE IC CODEWHEEL SHAFT 3 Absolute Maximum Ratings Storage Temperature –25°C to 80°C Operating Temperature –10°C to 55°C Supply Voltage DC4.5 V to 13.2 V (for output mode = V) DC4.5 V to 13.2 V; DC10.8 V to 26.4 V (for output mode = C) (note: VCC ripple at 3% p-p max.) Humidity RH85% Degree of Protection (IP50): Protected against dust-limited ingress (no-harmful deposit) and no protection against liquids. Shock 490 m/s2 with 11ms at X, Y, Z directions Electrical Characteristics (over recommended operating conditions. Typically at 25°C) Parameter Symbol Maximum Units Current Consumption (without load) ICC 160m (max.) for option V 100m (max.) for option C A High Level Output Voltage VOH VCC – 1 V (for output mode = V) V Low Level Output Voltage VOL 0.5 or less V Rise Time tr 1 µs Fall Time tf 1 µs Response Frequency f 5K (max.) Hz ± 0.700° (max.) deg Angular Accuracy Mechanical Ratings Parameter Maximum Units Starting Torque 9.8 x 10–4 (max. at 25°C) Nm Angular Acceleration 1 x 105 rad/s2 Axial Thrust 19.6 N Radial 29.4 N Shaft Loading × 10-7 Kg.cm2 Moment of Inertia 8 Speed 6000 RPM Net-Weight (without cable) 120 g Vibration (in X, Y, Z directions for 2 hrs.) 10 to 55 Hz/1.5 mm (p-p) 4 Electrical Interface VOLTAGE OUTPUT OPEN COLLECTOR OUTPUT OUTPUT MODE OUTPUT MODE V VCC C VCC 2 KΩ SIGNAL SIGNAL 0V Output Waveforms Definition Signals are extracted by rotating the shaft in clockwise direction as viewed from arrow angle. The example signals shown are gray code output. 0V H 20 L H 21 L H 22 L H 23 L H 24 L H 25 L H 26 L H 27 L 0 5 1 2 3 4 5 6 7 Electrical Connections Color of Lead Wire Description Red Power Source Black 0 V Common Brown Signal 20 Orange Signal 21 Yellow Signal 22 Green Signal 23 Blue Signal 24 Purple Signal 25 Gray Signal 26 White Signal 27 Shielding Braid F.G. Ordering Information AEAS-72AA- Power Source L = 5 to 12 V H = 12 to 24 V AA Output Code G = Gray Code Negative Logic Part Numbers Currently Available: AEAS-72AA-HGCAA AEAS-72AA-LGCAA AEAS-72AA-LGVAA Note: Please contact your local Agilent sales representative for other options. 6 Output Mode C = Open Collector V = Voltage Out, only available for option L of power source (5 to 12 V) www.agilent.com/semiconductors For product information and a complete list of distributors, please go to our web site. For technical assistance call: Americas/Canada: +1 (800) 235-0312 or (408) 654-8675 Europe: +49 (0) 6441 92460 China: 10800 650 0017 Hong Kong: (+65) 6271 2451 India, Australia, New Zealand: (+65) 6271 2394 Japan: (+81 3) 3335-8152(Domestic/International), or 0120-61-1280(Domestic Only) Korea: (+65) 6271 2194 Malaysia, Singapore: (+65) 6271 2054 Taiwan: (+65) 6271 2654 Data subject to change. Copyright © 2003 Agilent Technologies, Inc. Obsoletes 5988-8180EN February 10, 2003 5988-8669EN