Allen-Bradley 844D-A Series Installation Instructions

Installation Instructions

Original Instructions
Blind and Through-shaft Optical Incremental Encoders
Catalog Numbers 844D-Ax, 844D-Rx

Summary of Changes

This publication contains new and updated information as indicated in
the following table.
Topic
Deleted "200 kHz Push-Pull (120-8192 PPR)" from Output Frequency from the
Specifications table
Deleted "Push-Pull Single Ended Driver = ±70 mA" from Specifications table
Deleted "Code 5" in Power Supply and Output from Selection tables
Deleted "Push-pull single end driver output" graphic

Specifications

Attribute
Electrical
Code Format
Page
Power Requirements
1
Output Frequency
1
Resolution
1
Output Driver Capability
2
Mechanical
Angular Acceleration
Starting Torque @ 25 °C (77 °F)
Running Torque @ 25 °C (77 °F)
Moment of Inertia
Slew Speed
Shaft Loading (120...2500 PPR)
Shaft Loading (4096...16,384 PPR)
Permissible Shaft Radial Movement
Permissible Shaft Axial Movement
Bore Size
Environmental
Protection
Housing material
Temperature
Humidity
Shock
Vibration
Approximate weight
844D-Ax, 844D-Rx
2 channels with zero index
120 mA (no load)
300 kHz all drivers (120...8192 PPR)
600 kHz (above 8192 PPR)
Up to 16,384 pulses per revolution
3487 Line driver = ±40 mA
4469 Line driver = ±200 mA
7272 Line driver = ±40 mA
2
100,000 radians/sec
9.3 Ncm (13 in•oz)
5 Ncm (7 in•oz)
2 -3 2
490 gcm (6.9 x x 10 oz-in-sec )
3000 rpm maximum
Axial 67 N (15 lbs) Radial 133 N (30 lbs)
Axial 44 N (10 lbs) Radial 67 N (15 lbs)
Static ±0.5 mm (0.02 in.) Dynamic ±0.1 mm (0.004 in.)
Static ±0.5 mm (0.02 in.) Dynamic ±0.5 mm (0.02 in.)
Supports 1/2...1-1/8 in. and 30 mm shafts
NEMA Type 4, 13, IP66 (IEC 529) except
terminal block connection type rated IP40 (IEC 529) only
Aluminum
Operating: -20...+85 °C (-4...+185 °F)
Storage: -30...+85 °C (-22...+185 °F)
90% noncondensing
50 g (1.76 oz) for 11 ms
20 g (0.70 oz) from 5...2000 Hz
0.91 kg (2 lbs)