AEAS-71AC-xxxxB
Absolute Encoder
Data Sheet
Description
The AEAS-71AC-xxxxB absolute encoder is a feed-
back device that has the capability to generate a unique
binary ‘word’ for each encoder shaft position. The
AEAS-71AC-xxxxB 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-71AC-xxxxB
consists of a lensed LED (Light Emitting Diode) source,
an integrated circuit with detectors and output cir-
cuitry, 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 very wet and dusty
conditions. Models with IP65 ratings have sealed
bearings.
Features
• Gray or binary code options
• High or low power source options
• IP 65 rating
• 50 mm package diameter
• 8 bits and 10 bits resolution
• Hollow shaft with 8 mm inside diameter
• The package comes with 2 m long cable
Applications
•
•
•
•
•
Tool changers and axis control for machine tools
Robotics
Telescopes and antennas
Rotary and X - Y positioning tables
Medical scanners
Package Dimensions
14 ± 0.3
35
MODEL NAME
PLATE
ZERO ADDRESS POSITION
TOLERANCE ± 5°
∅
6
7
1
°±
15
4
∅
60
1°
A
30°±
∅8H7
1.6
∅50 ±
0.2
2-R
2-M3
13
(∅8 EFFECTIVE DEPTH)
12 ± 1
20
0.05
A
20
10
60
A
TOLERANCE IS ± 0.5 mm UNLESS
OTHERWISE SPECIFIED.
TYPICAL DIMENSIONS IN MILLIMETERS.
JIS (JAPANESE INDUSTRIAL STANDARD)
8H7
8g6
NOTE: INFORMATION FROM JIS B0401(1999)
DEFINITION (mm)
+0.015
-0
+0.005
8
-0.014
8
∅8g6
2-M3
A
NOTE:
THRUST VARIABLE OF
THE SHAFT: 0.2 mm OR LESS
0.1
ATTACHED DIMENSIONS OF SHAFT AND INTERNAL THREADS
CONNECTIONS
BLU
RED +*~*V
BLK 0V.COM VLT
BRN
2
0
GRA
ORN
2
1
WHT
YEL
2
2
SHIELD
GRN
2
3
CONNECTIONS
BLU
RED +*~*V
BLK 0V.COM VLT
BRN
2
0
GRA
ORN
2
1
WHT
YEL
2
2
PNK
GRN
2
3
SKY
SHIELD
40 MAX.
2
4
2
5
2
6
2
7
FG
ABSOLUTE ENCODER
PART No: AEAS-71AC-XXXBB
SERIAL No: XX-XXX
MADE IN JAPAN
2
4
2
5
2
6
2
7
2
8
2
9
FG
10 BIT SPEC
A
5°
ABSOLUTE ENCODER
PART No: AEAS-71AC-XXXAB
SERIAL No: XX-XXX
MADE IN JAPAN
8 BIT SPEC
2
Theory of Operation
The AEAS-71AC-xxxxB is a single-
turn, low-cost, and compact
absolute encoder which uses
optical technology to provide
absolute positioning information.
The AEAS-71AC-xxxxB consists of
a LED, Fixed Slit, Codewheel
(Rotating Disc) and Photodiode IC.
By using these four main compo-
nents, the AEAS-71AC-xxxxB 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.
LED
FIXED SLIT
PHOTODIODE IC
CODEWHEEL
SHAFT
3
Absolute Maximum Ratings
Storage Temperature
Operating Temperature
Supply Voltage
–30°C to 85°C
–10°C to 60°C
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)
DC10.8 V to 26.4 V (for output mode=P)
(notes: V
CC
ripple at 3% p-p max.)
RH85%
(IP65): Totally protected against dust and protected against low-pressure
jets of water from all directions; limited ingress permitted.
980 m/s
2
with 11ms at X, Y, Z directions
Humidity
Degree of Protection
Shock
Electrical Characteristics
(over recommended operating conditions. Typically at 25˚C)
Parameter
Current Consumption (without load)
High Level Output Voltage
Low Level Output Voltage
Rise Time
Fall Time
Response Frequency
Angular Accuracy
Symbol
I
CC
V
OH
V
OL
t
r
t
f
f
Maximum
100m (max.)
V
CC
– 1 V (for output mode = V)
0.5 or less
2
2
10K (for 8 bit resolution)
20K (for 10 bit resolution)
±
0.700° (max. for 8 bit resolution)
±
0.175° (max. for 10 bit resolution)
Units
A
V
V
µs
µs
Hz
deg
Mechanical Ratings
Parameter
Starting Torque
Angular Acceleration
Shaft Loading
Moment of Inertia
Speed
Net-Weight (without cable)
Vibration (in X, Y, Z directions for 2 hrs.)
Axial Thrust
Radial
Maximum
9.8 x 10
–3
(max. at 25°C)
1 x 10
5
49
78.4
30
5000
250
10 to 55
Units
Nm
rad/s
2
N
N
g.cm
2
RPM
g
Hz/1.5 mm (p-p)
4
Electrical Interface
OPEN COLLECTOR OUTPUT
OUTPUT MODE
C
V
CC
VOLTAGE OUTPUT
OUTPUT MODE
V
2 KΩ
SIGNAL
SIGNAL
V
CC
0V
0V
PNP OPEN COLLECTOR OUTPUT
OUTPUT MODE
P
V
CC
SIGNAL
0V
5
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