Features
■
■
■
■
■
■
Lead free
Absolute encoder / gray code output
Digital output
Sturdy construction
Bushing mount
Available with PC board mounting bracket (optional)
EAW - Absolute Contacting Encoder (ACE
™
)
General Information
Until now, the choice of an absolute
encoder meant an expensive, and larger-
sized product. Through the use of
combinatorial mathematics, the gray-code
pattern of the Bourns Absolute Contacting
Encoder ACE™ is placed on a single track
for a very economical, energy-efficient and
compact product. Bourns’ ACE™ provides
an absolute digital output that will also
retain its last position in the event of a
power failure.
An intelligent alternative to incremental
encoders and potentiometers, the Bourns
ACE™ is ideally suited for many industrial,
automotive, medical and consumer product
applications.
Recommended Control Diagram for ACE-128
RESNET
4609X-
101-472
“common” is either
on a decoded
“select” pin
(active low)
or at GND.
1
2
C
3
4
8
7
C
6
5
P
1
P
2
P
3
P
4
P
5
P
6
P
7
P
8
µP
ACETAB:
256 byte
code
conversion
table (ROM)
Electrical Characteristics
Output ........................................................................................................................................................................8-bit gray code with 128 absolute states
Closed Circuit Resistance ..............................................................................................................................................................................5 ohms maximum
Open Circuit Resistance ..........................................................................................................................................................................100 K ohms minimum
Contact Rating......................................................................................................................................................10 milliamp @ 10 VDC or 0.1 watt maximum
Insulation Resistance (500 VDC)........................................................................................................................................................1,000 megohms minimum
Dielectric Withstanding Voltage (MIL-STD-202 Method 301)
Sea Level ................................................................................................................................................................................................1,000 VAC minimum
Electrical Travel..........................................................................................................................................................................................................Continuous
Contact Bounce (60 RPM) ..............................................................................................................................................................2.7 milliseconds maximum*
RPM (Operating) ..................................................................................................................................................................................................120 maximum
Environmental Characteristics
Operating Temperature Range ..........................................................................................................................................+1 ºC to +85 ºC (+34 °F to +185 °F)
Storage Temperature Range..............................................................................................................................................-40 ºC to +85 ºC (-40 °F to +185 °F)
Humidity....................................................................................................................................................................MIL-STD-202, Method 103B, Condition B
Vibration ..............................................................................................................................................................................................................................15 G
Contact Bounce ............................................................................................................................................................................0.1 millisecond maximum
Shock ..................................................................................................................................................................................................................................50 G
Contact Bounce ............................................................................................................................................................................0.1 millisecond maximum
Rotational Life ......................................................................................................................................................................50,000 shaft revolutions minimum
IP Rating ..............................................................................................................................................................................................................................IP 40
Mechanical Characteristics
Mechanical Angle ............................................................................................................................................................................................360 ° Continuous
Running Torque ..................................................................................................................................................................0.5 to 1.5 N-cm (0.75 to 2.50 oz-in.)
Mounting Torque............................................................................................................................................................................79 N-cm (7 lb.-in.) maximum
Shaft Side Load (Static) ......................................................................................................................................................................4.5 kg (10 lbs.) minimum
Weight ....................................................................................................................................................................................Approximately 14 gms. (0.50 oz.)
Terminals ....................................................................................................................................................................................Printed circuit board terminals
Soldering Condition
Manual Soldering ....................................................................................................................96.5Sn/3.0Ag/0.5Cu solid wire or no-clean rosin cored wire
370 °C (700 °F) max. for 3 seconds
Wave Soldering ..............................................................................................................................................96.5Sn/3.0Ag/0.5Cu solder with no-clean flux
260 °C (500 °F) max. for 5 seconds
Wash processes ........................................................................................................................................................................................Not recommended
Marking ............................................................................................................................Manufacturer’s name and trademark, part number, and date code.
Hardware ..................................................One lockwasher and one mounting nut are shipped with each encoder, except where noted in the part number.
Packaging ................................................................................................................................................................................................................45 pcs./tray
*High probability of missing gray codes with maximum bounce.
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
EAW - Absolute Contacting Encoder (ACE
™
)
How to Order
PART NUMBERING SYSTEM
E A W 0 J
-
B 2 4
- A E 0 1 2 8
L
Code Rotational Life
A
50,000 Revolutions
Code Description
L
Lead Free
BUSHING CONFIGURATION
Code Description
W
9 mm x 1/4 " Length. Threaded M9x0.75
L
9 mm x 3/8 " Length. Threaded M9x0.75
(Use B shaft only.)
PERFORMANCE CODE
Code Detents States/Rev.
E0128
0
128
DETENT CONFIGURATION
Code Description
0
Non-Detented
HOUSING TERMINAL CONFIGURATION
(X indicates “Equipped With”)
Code
Features
A
B
C
H
Rear Mount Terminals
X
X
X
Forward Facing Terminals
X
PCB Bracket
X
X
Hardware Included
X
X
X
K
X
ANTI-ROTATION LUG POSITION
Code Description
J
9:00 Position
D
None
SHAFT LENGTH (FMS)
Available
Code Description
Shaft Styles
24
3/4 " (19.05 mm) Length
B, C
Metric
19
19 mm Length
R
SHAFT STYLE (See Outline Drawing for Details)
Code Description
B
Plain with Inserted Slot (1/4 " Dia.)
C
Single Flatted (1/4 " Dia.)
R
Plain with Inserted Slot (6 mm Dia.)
The sample part number demonstrates the identification
code for Bourns contacting encoders.
The part number shown is a commonly used model,
typically available from stock.
*Consult factory concerning special inquiries.
REV. 11/1/04
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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