Rockwell Automation 847A User Manual
Installation Instructions
IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.
847
A
a
-
Q
b
c
e
-
65536
31 4 R B
dfgh
847A and 847B Hollow Shaft Incremental Encoders
Selection Guide
a
Code Encoder Diameter/Type
A 2 in. diameter, blind hollow shaft
B 2 in. diameter, through hollow shaft
b
Code Mounting Configuration
Q
R
3-point mounting
2-point mounting
c
Code Shaft Size
3 3/8 in. diameter metal hollow shaft
4 1/2 in. diameter metal hollow shaft
e
Code Output Configuration
Signal Phasing A-leads-B
clockwise rotation viewed from shaft end, Z gated A
4
5
6
7
Signal Phasing B-leads-A
clockwise rotation viewed from shaft end, Z gated BN
A
B
C
D
Options 5 and B cannot be ordered with option 2 from Table d.
Options 6, 7, C, and D cannot be ordered with option 1 from Table d.
4.5…5.5V line driver outputs (TTL)
4.5…5.5V open collector outputs
8…30V line driver outputs (HTL)
8…30V open collector outputs
4.5…5.5V line driver outputs (TTL)
4.5…5.5V open collector outputs
8…30V line driver outputs (HTL)
8…30V open collector outputs
f
Code Connector/Cable Exit
R
Radial exit
d
Code Power Supply
14.5…5.5V DC
28…30V DC
Accessories
Description Part Number
Differential encoder buffer board 845-BB*
M12 cable 889D-F8FB-*
* See Sensor Catalog for selection
g
Code Connector/Cable Type
A
B
P
Q
R
M12 connector, 8-pin with mating connector
M12 connector, 8-pin
1.5 m (4.9 ft) cable
5 m (16.4 ft) cable
10 m (32.8 ft) cable
h
Code Resolution
00001...
65536
00001...65536 pulses/revolution
Specifications
Make sure mating shaft is chamfered and
grease-free.
Do not stress the flex mount while tightening
the screws.
Environmental
Electrical
Code format Incremental
Signal options,
clockwise rotation viewed from
shaft end
Signal phase relation 90° ± 22° channels
Symmetry 40…60%
Supply current 50 mA
Frequency response 4.5…5.5V line driver output: 820 kHz
Resolution 1...65536 pulses/revolution
Load current 30 mA for all output types
Output drivers 4.5…5.5V line driver - IC HD2
Electrical protection Reverse polarity and short circuit for
Cable outer diameter 0.25 in (6.2 mm)
Cable type 300V, 105 °C, 26 AWG, 9-conductor
Two channels with zero index
A-leads-B, 180° marker gated with A
or
B-leads-A, 180° marker gated with BN
8…30V line driver output: 820 kHz
Open collector: 150 kHz
8…30V line driver - IC HD2
Open collector - 7406
all output types
with overall braided shield, UL AWM
type 20327 for use in fixed (nonflexing) installations; RoHs compliant.
Enclosure rating per IEC 60529 Shaft: IP 65
Housing, connector version with
mating connector installed:
with blind hollow shaft: IP67
with through hollow shaft: IP65
Housing, cable version:
with blind hollow shaft: IP67
with through hollow shaft: IP65
Temperature -30…80 °C (-22...176 °F) operating
-40…100 °C (-40...212 °F) storage
Relative humidity 90% non-condensing
Shock 100 G/11 ms duration
Vibration 30 G/10…2,000 Hz
EMC EN 61000-6-2 and EN 61000-6-3
(M12 connector)
Housing material EN AC-47100 die-cast aluminium
Housing finish Powder coat paint, color RAL 9005,
Pantone black C (jet black)
Flange material 6061-T6 aluminium
Shaft material SAE 303 stainless steel
Certifications UL Listed, RoHS compliant
CE Marked for all applicable directives
Mounting Instructions
Cable bend radius Minimum 5x outer diameter
Mechanical
Maximum operating speed 6,000 RPM
Angular acceleration 500,000 radians/s²
Moment of inertia 40 g•cm²
Startup torque at 20 °C (68 °F) 0.8 N•cm
Operating torque at 20 °C (68 °F)
Permissible shaft movement
[mm (in.)]
Hollow shaft diameter 3/8 in. (9.5 mm) or 1/2 in. (12.7 mm)
Approximate weight [kg (lb)] 0.16 (0.35) with M12 connector
MTTFd (EN ISO 13849-1) 330 years
0.6 N•cm
Radial
Static: ± 0.3 (0.012)
Dynamic: ± 0.05 (0.002)
Axial
Static: ± 0.5 (0.02)
Dynamic: ± 0.1 (0.004)
IMPORTANT
1. Using a 5/64-in. Allen wrench, loosen the screw on the
clamping ring.
2. Slide the encoder onto the mating shaft until the flex
mount rests on the machine surface.
The encoder should slide freely onto the shaft; if not, do
not force. Check the shaft for interferences such as
gouges, burrs, rust, or size.
If mounting holes already exist, proceed to step 6.
3. Hold encoder firmly and mark the mounting holes.
4. Mount the encoder with #4-40 (or equivalent) screws.
5. Slide the encoder back onto the shaft until the flex
mount rests on the machine surface.
6. Attach the encoder with #4-40 (or equivalent) screws.
IMPORTANT
7. Tighten the clamping ring screw to 8 in-lb.
2
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