Installation Instructions
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Approximate
2lbs. (0.91kg)
Size 25 Absolute Encoder, Bulletin 845G
IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.
Specifications
Electrical
Code Format
Counts per Rev. (CPR)
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
Output Drive Capability
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
Mechanical
Environmental
ÁÁÁÁ
Resolution
Accuracy
Frequency Response
Power Requirements
Output Logic
Latch Command
Direction Control
Starting Torque
Running Torque
Shaft Loading
Shaft Size
Moment of Inertia
Slew Speed
Temperature
Humidity
Vibration
Approximate
Shipping Weight
Reset
Housing
Shock
Gray Code, Natural Binary, Binary Coded Decimal
(parallel); Gray Code (SSI)
256 CPR (8 bit)
360 CPR (9 or 10 bit)
ÁÁÁÁ
512 CPR (9 bit)
1000 CPR (12 bit BCD)
ÁÁÁÁ
1024 CPR (10 bit)
2048 CPR (11 bit)
4096 CPR (12 bit)
БББББ
8192 CPR (13 bit)
16384 CPR (14 bit)
БББББ
32768 CPR (15 bit)
±1 bit
16K words/sec
Determined by Catalog Number:
5V DC ±5% @ 150mA maximum
8-24V DC @ 150mA maximum
ББББББББББ
10-30V DC @ 150mA maximum
16mA
Parallel Gray, Natural Binary or Binary Coded Decimal
(BCD)
ББББББББББ
Logic 0" = 0.0 to 0.6V DC
Logic 1" = 3.5 to 5V DC (TTL)
ББББББББББ
Logic 1" = 24V DC maximum
(Open Collector)
ББББББББББ
SSI RS-422 compatible
Standard with Natural Binary and BCD
Logic 0" = outputs active (DC common)
ББББББББББ
Logic 1" = outputs latched (+DC or open)
Field selectable for increasing counts
(CW or CCW)
ББББББББББ
Reset position value to zero (see note on page 3). Only
with shaft stationary.
3.5 in.-oz. Typical [0.025 NDm]
3.5 in.-oz. Typical [0.025 NDm]
Axial 20 lbs. [89 N]
Radial 40 lbs. [178 N]
3/8 inch diameter [9.517mm] w/flat
0.08 oz.-in.2 maximum
5000RPM
NEMA Type 4, 13, IP66 (IEC 529)
0°C to +85°C (+32°F to +185°F)ĊOperating
-20°C to +85°C (-4°F to +185°F)ĊMax Working
-40°C to +100°C (-40°F to +212°F)ĊStorage
ББББББББББ
98%, Noncondensing
50g (11ms duration)
20g (58-150Hz), 1.5mm displacement (10-58Hz)
2lbs. (0.91kg)
Selection
845G — F3G 5 H C 1024 R
a b c d e f g
a
Mounting
Configuration
Code Description
Square FlangeF
S English Servo
Output Code Type
Code Description
D Binary Coded Decimal
G Gray Code
b
Natural BinaryB
(0360 & 1000 resolution only)
c
Power Supply
Code Description
5V DC ±5%5
8 8-24V DC
A
10-30V DC Ê
Code Description
L
d
Output Logic
High TrueH
Low True Ë
e
Output Configuration
Code Description
C
P
S
NPN Open Collector
24V DC Max.
10-30V DC
PushĆPull (7272) Ê
SSI Output ÊÌÍ
Code Description/Range
0360
T 5V DC TTL NPN
1000
g
Connector Options
Code Description
A
Axial 19ĆPin
R Radial 19ĆPin
S
T
U
Axial 17ĆPin
Axial 12ĆPin Í
Radial 12ĆPin Í
Ê PushĆPull or SSI output can only be ordered with 10-30V DC power supply.
Ë Not available with pushĆpull and SSI output. Output logic inverted.
Ì SSI available with Gray Code output only.
Í SSI only available with 12Ćpin connector.
Î Excess 76 used for 9 bit gray code. BCD is 10 bit.
4096
f
Resolution
8 bit/0-2550256
9 or 10 bit/0-359 Î
9 bit/0-5110512
12 bit/0-999
BCD only
10 bit/0-10231024
11 bit/0-20472048
12 bit/0-4095
13 bit/0-81918192
14 bit/0-16,383016K
15 bit/0-32,767032K
ATTENTION: The shielded cables, output devices,
and power supplies must be properly grounded. All
National Electric Code and applicable local codes
and ordinances must be observed when wiring the
system.
Accessories
Description Part Number
High Performance Flexible Coupling 845-FC-*-*
Measuring Wheels 845-MW-A-*
Servo Clamps 845-SC
*See Sensors catalog for selection.
Number of Pins Mating Connector PreĆWired Cable
12 845-12P 845-CA-G-**
17 845-17P 845-CA-H-**
19 845-SCD 845-CA-D-**
Electrical Connections—17 Pin Connector (All code types)
845-CA-H-__
Pin
A White/Orange G(0) or 2
B White G(1) or 2
C Gray G(2) or 2
D Violet G(3) or 2
E Blue G(4) or 2
F Yellow G(5) or 2
G Orange G(6) or 2
H Brown G(7) or 2
J White/Violet G(8) or 2
K White/Brown G(9) or 2
L White/Green G(10) or 2
M White/Yellow G(11) or 2
N White/Red G(12) or 2
P White/Blue
Wire Color
8192 (13 Bit)
0
1
2
3
4
5
6
7
8
9
10
11
12
Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê
R Black DC Common DC Common DC Common DC Common DC Common DC Common DC Common
S Red +DC +DC +DC +DC +DC +DC +DC
T Green
Direction Ë Direction Ë Direction Ë Direction Ë Direction Ë Direction Ë
1000 BCD or
4096 (12 Bit)
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
G(9) or 2
G(10) or 2
G(11) or 2
2048 (11 Bit)
0
1
2
3
4
5
6
7
8
9
10
11
0
G(0) or 2
1
G(1) or 2
2
G(2) or 2
3
G(3) or 2
4
G(4) or 2
5
G(5) or 2
6
G(6) or 2
7
G(7) or 2
8
G(8) or 2
9
G(9) or 2
10
G(10) or 2
N/C N/C N/C N/C
360 BCD or
1024 (10 Bit)
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
G(9) or 2
0
1
2
3
4
5
6
7
8
9
512 (9 Bit) 360 (9 Bit) 0256 (8 Bit)
0
G(0) or 2
1
G(1) or 2
2
G(2) or 2
3
G(3) or 2
4
G(4) or 2
5
G(5) or 2
6
G(6) or 2
7
G(7) or 2
8
G(8) or 2
N/C N/C N/C
N/C N/C N/C Reset
Reset Reset Reset Reset Reset
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
0
1
2
3
4
5
6
7
8
Latch Control Ê
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
N/C
Direction Ë
N/C
Case Ground
0
1
2
3
4
5
6
7
Electrical Connections—19 Pin Connector (Gray code or natural binary)
845-CA-D-__
Pin
A Brown G(0) or 2
B Orange G(1) or 2
C Yellow G(2) or 2
D Green G(3) or 2
E Blue G(4) or 2
F Violet G(5) or 2
G Gray G(6) or 2
H White G(7) or 2
J White/Orange G(8) or 2
K White/Brown G(9) or 2
L White/Red G(10) or 2
M White/Yellow G(11) or 2
N White/Green G(12) or 2
P White/Blue G(13) or 2
R White/Black G(14) or 2
S White/Violet
Wire Color
32768 (15 Bit) 16384 (14 Bit) 8192 (13 Bit) 4096 (12 Bit) 2048 (11 Bit) 1024 (10 Bit)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Direction Ë Direction Ë Direction Ë
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
G(9) or 2
G(10) or 2
G(11) or 2
G(12) or 2
G(13) or 2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
G(9) or 2
G(10) or 2
G(11) or 2
G(12) or 2
N/C
0
1
2
3
4
5
6
7
8
9
10
11
12
N/C N/C G(0) or 2
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
G(9) or 2
G(10) or 2
G(11) or 2
Direction Ë Direction Ë
0
1
2
3
4
5
6
7
8
9
10
11
N/C G(1) or 2
0
G(0) or 2
1
G(1) or 2
2
G(2) or 2
3
G(3) or 2
4
G(4) or 2
5
G(5) or 2
6
G(6) or 2
7
G(7) or 2
8
G(8) or 2
9
G(9) or 2
10
G(10) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
G(8) or 2
G(9) or 2
Direction Ë Direction Ë Direction Ë
N/C N/C N/C
N/C N/C N/C
N/C N/C N/C
Reset Reset Reset Reset Reset Reset Reset
N/C N/C N/C N/C N/C
0
1
2
3
4
5
6
7
8
9
T Black DC Common DC Common DC Common DC Common DC Common DC Common DC Common DC Common
U White/Gray
Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê Latch Control Ê
V Red +DC +DC +DC +DC +DC +DC +DC +DC
Ê Latch control not available with Gray Code or SSI output. On Gray Code encoders this pin is not connected (N/C).
Ë The Direction pin function is either Direction Control or MSBC. See next page for further detail.
360 and
512 (9 Bit)
0
G(0) or 2
1
G(1) or 2
2
G(2) or 2
3
G(3) or 2
4
G(4) or 2
5
G(5) or 2
6
G(6) or 2
7
G(7) or 2
8
G(8) or 2
N/C N/C
0256 (8 Bit)
G(0) or 2
G(1) or 2
G(2) or 2
G(3) or 2
G(4) or 2
G(5) or 2
G(6) or 2
G(7) or 2
N/C
0
1
2
3
4
5
6
7
2
Electrical Connections—19 Pin Connector (Binary Coded Decimal)
__
845-CA-G-
Pin 845-CA-D-___ Wire Color 1000 BCD (12 Bit) 360 BCD (10 Bit)
V Red +DC +DC
A Brown 1 1
B Orange 2 2
C Yellow 4 4
D Green 8 8
E Blue 10 10
F Violet 20 20
G Gray 40 40
H White 80 80
J White/Orange 100 100
K White/Brown 200 200
L White/Red 400 N/C
M White/Yellow 800 N/C
N White/Green N/C N/C
P White/Blue N/C N/C
R White/Black Direction Control Direction Control
S White/Violet Reset Reset
T Black DC Common DC Common
U White/Gray Latch Control Latch Control
Electrical Connections for SSI Output—12 Pin Connector
Catalog Number Wire Pair Wire Color Function Pin
Red +DC Input 8
Black DC Common 1
White Clock + 3
Black Clock - 11
Blue Data + 2
Black Data - 10
Green Direction Control 12
Black Reset 9
845-CA-G-
(With 12 pin connector
__
Red/Black/Shield
White/Black/Shield
Blue/Black/Shield
Green/Black/Shield
Direction Pin
The Direction Pin can change function with code type. In
parallel type Gray Code encoders, its function is Most
Significant Bit Complement or MSBC for short. In Natural
Binary, Binary Coded Decimal and Gray Code SSI encoders,
its function is Direction Control.
Direction Control Ê
Natural Binary and BCD
A logic “1” (+DC or open) on the direction control pin will
produce increasing counts with a counterclockwise rotation of
the shaft. A logic “0” (DC common) on the direction control pin
will produce increasing counts with a clockwise rotation of the
shaft.
Gray Code (SSI)
A logic “1” (+DC or open) on the direction control pin will
produce increasing counts with a clockwise rotation of the
shaft. A logic “0” (DC common) on the direction control pin will
produce increasing counts with a counterclockwise rotation of
the shaft.
Ê Rotation is viewed from the end of the encoder shaft.
Gray Code (parallel)
Counterclockwise rotation of the shaft will produce increasing
counts. For increasing counts with a clockwise rotation, use
the Most Significant Bit Complement Pin instead of the Most
Significant Bit Pin. See Electrical Connection table for pin
designation.
ATTENTION: For parallel gray code: connecting the
MSB or MSBC to +DC will result in permanent
damage to the encoder.
Reset Pin
The shaft must be stationary before using the reset function.
Connecting the Reset Pin to +DC will reset Natural Binary and
BCD position value to zero. Connecting the Reset Pin to +DC
will reset Gray Code position value to zero if MSB is used or
to maximum, (e.g., 255, 511, 1023, etc.) if MSBC is used. The
reset function requires a connection to +DC for 0.1 seconds or
longer.
ATTENTION: Activating the Reset Pin results in a
change of position reading. This can cause
unexpected motion which could result in damage to
the product, equipment, or personal injury.
3
Flexible Shaft Couplings
ATTENTION: Rigidly coupling the encoder shaft
to the machine shaft will cause a failure in either
the bearings of the encoder or the bearings of the
machine shaft.
Dimensions—inches (mm)
2.30 (58.42)
Axial Mount
Connector
Angle
Parallel
OffĆSet
Radial Mount
Connector
Axial Mount
Connector
2.30 (58.42)
Radial Mount
Connector
2.50 (63.5)
0.300
(7.62)
1.032 (26.21)
1.032
(26.21)
2.063
(52.40)
Max.
Square Flange Mount
2.063
(52.40)
2.62 (66.5)
Sq.
0.25 (6.35)
0.85/0.90
(21.59/22.86)
+ 0.000
1.250
- 0.001
(31.75)
0.21 (5) Dia.Ċ4 Mtg. Holes
Dia.
8-32 UNCĆ2B x 0.18 (4.6)
Deep on a 1.875 (47.6) Dia.
Bolt Circle, 3 PlacesĊ120°
Apart
0.28 (7) Rad. Typ. 4 Places
0.75
(19.05)
0.34 ±0.01
(8.636)
Shaft Dimensions
∅0.3747
(9.517)
2.31 (58.67) Dia.
2.500
(63.50)
+ 0.0000
- 0.0003
2.50 (63.5)
Max.
0.300 (7.62)
+ 0.000
- 0.003
Dia.
2.56 (65) Dia.
English Servo Mount
0.100 (2.54) Max.
0.100 ± 0.005
(2.54)
0.85/0.90
(21.59/22.86)
+ 0.000
1.250
- 0.001
8-32 UNCĆ2B x 0.18
(4.6) Deep on a 1.875
(47.6) Dia. Bolt Circle,
3 PlacesĊ120° Apart
(31.75) Dia.
Visit our web site at:
http://www.ab.com/sensors
4
Publication 75008–166–01(F)
September 2002
Printed in USA
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