Mechanical Encoders
SERIES 51
Binary or Binary
Complement Code
FEATURES
• PC Mount, 30° Angle of Throw
• 2 to 12 Positions
• .562" Diameter, 200 mA
• Shaft and Panel Seal
• Adjustable Stop Versions
DIMENSIONS
In Inches (and millimeters)
.250 ± .015
(6,35 ± 0,38)
.537 + .020 –.030
(13,64 + 0,51 –0,76)
.375 ± .015
(9,53 ± 0,38)
105¡
.250 + .020 – .015
(6,35 + 0,51 –0,38)
.125 + .015
–.020
(3,18 + 0,38
–0,51)
.035 (0,89)
REF.
.093 ± .005
(2,36 ± 0,13)
Ø .232 (5,89)
COMMON CIRCLE
OF CENTERS
COMMON
POLE 1
GRAYHILL
6 5
COMMON
POLE 2
Optical and Mechanical
Encoders
C
L
SHAFT
FLAT
.203 ± .003
(5,16 ± 0,08)
Ø .562 + .025
–.015
(14,27 + 0,64
– 0,38)
8 7
Ø .125 ± .002
(3,18 ± 0,05)
COMMON
POLE 3
1/4-28 UNF-2A
THREAD
PC TERMINAL DETAIL
.125± .015
(3,18 ± 0,38)
.125± .015
(3,18 ± 0,38)
PC COMMON DETAIL
.020 ± .003
(0,51 ± 0,08)
Ø .382 (9,70) TERMINAL
CIRCLE OF CENTERS
See circuit
diagrams for
omitted terminals.
Ø .025 ± .002
(0,64 ± 0,05)
.020 ± .003
(0,51 ± 0,08)
.062 ± .004
(1,57 ± 0,10)
All switches are provided with PC mount terminals.
Grayhill part number and date code marked on label. Customer part number marked on request.
CIRCUIT DIAGRAMS
Switch is viewed from the shaft end and shown
in switch position number 1, which is decimal
number zero and BCD number zero.
Indicates Terminal is present.
Indicates Terminal is omitted.
Note: Connections must be made on PC board to
generate code output.
Switch position numbers do not correspond to the
decimal input or binary output. See Truth Tables.
BCD
TIED TOGETHER
ON PC BOARD
4 OUTPUT
3
2 C1
1
ROTATING
CONTACTS
12
11
C3
10
8
9
4
5
6
C2
7
1 OUTPUT
2 OUTPUT
TIED TOGETHER
ON PC BOARD
8 OUTPUT
BCD Complement
TIED TOGETHER
ON PC BOARD
4 OUTPUT
3
TIED TOGETHER
ON PC BOARD
ROTATING
CONTACTS
12
11
C3
10
9
8
2 C1
1
4
5
6
C2
7
2 OUTPUT
TIED TOGETHER
ON PC BOARD
1 OUTPUT
TIED TOGETHER
ON PC BOARD
8 OUTPUT
COMMON
TIED TOGETHER
ON PC BOARD
COMMON
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
Encoder
7
Mechanical Encoders
TRUTH TABLES
Binary Code Decimal
Dec.
No.
0
1
2
3
4
5
6
7
8
9
10
11
OPTIONS
Binary Code Decimal Complement
Output Terminal
1
2
4
8
Dec.
No.
0
1
2
3
4
5
6
7
8
9
10
11
Adjustable Stops
Set and reset stops to limit rotation. All
dimensions are the same as for fixed stop
switches. Switches are shipped with the stop
blades located to limit rotation to 11 switch
positions. For continuous rotation, remove both
blades. For limited rotation, remove the 2nd
(clockwise) blade and move it to the hole
located between the positions shown in the
Truth Tables. Removal of a plastic washer
provides access to the blades and slots.
Adjustable stop versions are available in
unsealed styles only.
Switch
Pos'n.*
1
2
3
4
5
6
7
8
9
10
11
12
2nd
Pin**
4-5
5-6
6-7
7-8
8-9
9-10
10-11
11-12
12-1
1-2
2-3
3-4
Switch
Pos'n.*
1
2
3
4
5
6
7
8
9
10
11
12
2nd
Pin**
12-1
1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-9
9-10
10-11
11-12
Output Terminal
1
2
4
8
Shaft and Panel Seal
Switches are available in sealed or unsealed
styles. For sealed style, the panel is sealed by
an o-ring at the base of the bushing. The shaft
is sealed by an o-ring inside of bushing. After
the switch is mounted, seals do not alter the
dimensions of the unsealed style.
Indicates contact made to common
* The switch position number is the terminal location opposite the shaft flat; it is not the same as
the decimal number.
** To limit an adjustable stop switch to the decimal number shown, insert the second pin in the hole
lying between the 2 switch positions indicated.
SPECIFICATIONS
Optical and Mechanical
Encoders
Electrical Rating
Rated:
To make and break 125 mA 30 Vdc
resistive load for 25,000 cycles of operation.
Cycle:
(1 cycle = 360° rotation and return)
Test conditions are standard atmospheric
pressure, 25°C and 68% relative humidity.
Contact Resistance:
20 milliohms initially,
300 milliohms maximum after life
Insulation Resistance:
50,000 megohms
initially, 10,000 megohms after life
Voltage Breakdown:
500 Vac between
mutually insulated parts
Materials and Finishes
Bases:
Thermoset plastic
Detent Rotor:
Nylon
Shaft, Stop Blades, Stop Arm, Thrust
Washer And Retaining Ring:
Stainless steel
Detent Balls:
Steel, nickel-plated
Bushing:
Zinc, Tin-zinc-plated
Detent Spring:
Stainless steel
Common Terminals and Rings:
Brass, gold
plate .00003" minimum over silver plate .0003"
minimum
Terminals:
Brass with silver contact surface,
gold-plated .00003"
Rotor Contact:
Berillium copper with silver
contact surface
Shaft And Panel Seal:
Silicone rubber
Mounting Hardware:
One mounting nut, .089"
thick by .375" across flats, and one internal
tooth lockwasher are supplied with the switch.
Additional Characteristics
Contact Type:
Wiping contacts
Shaft Flat Orientation:
Switch position is
defined as that position that is opposite the
shaft flat. The location of the contacts in
relation to the shaft flat is shown on the circuit
diagram.
Terminals:
Only the active position terminals,
as shown in the circuit diagram are supplied
with the switch. All common terminals are
supplied.
Stop Strength:
7.5 in-lbs minimum
Rotational Torque:
8 to16 in-oz
Bushing Mounting:
Required for these
switches
Maximum Mounting Torque:
15 in-lbs.
ORDERING INFORMATION
Type Of
Switch
Maximum No.
Of Positions
7
8
9
10
11
12
12
12
BCD Output
Unsealed
513360-7
513360-8
513360-9
513360-10
513360-11
513360-12-F
513360-12-C
513385
Sealed
513374-7
513374-8
513374-9
513374-10
513374-11
513374-12-F
513374-12-C
———
BCD Complement
Unsealed
Sealed
513361-7
513361-8
513361-9
513361-10
513361-11
513361-12-F
513361-12-C
513384
513375-7
513375-8
513375-9
513375-10
513375-11
513375-12-F
513375-12-C
———
Fixed Stop
Continuous Rotation
Adjustable Stop
The -C suffix indicates continuous rotation. The -F suffix indicates a fixed stop between positions 1 and 12.
Available from your local Grayhill Distributor.
For prices and discounts, contact a local Sales Office, an authorized local Distributor or Grayhill.
Encoder
8
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
RF/Wirelessly
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