beautypg.com

Rockwell Automation 842HR Sine Cosine/Serial Encoders User Manual

Size 25, high resolution auxiliary servo feedback, Features, Benefits

background image

1

Installation Instructions

842HR Sine Cosine/Serial Encoders

Size 25, High Resolution Auxiliary Servo Feedback

IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Description

Bulletin 842HR is a 15-bit serial/sine cosine encoder. Targeted for
high performance digital servo drive systems that require
absolute feedback for position control and high resolution
incremental feedback for speed control.
Rockwell Automation’s sine cosine high performance encoders
provide commutation, speed regulation and position control all
in one device. Absolute position values of up to 15 bit combined
with incremental resolution up to 2 million counts per turn.

Features

• Absolute feedback for position control
• High resolution Incremental feedback for speed control
• Commutation
• Sine cosine differential interface
• Digital bi-directional RS-485 interface
• Compatible with Hiperface® interface
• Internal diagnostic functions

Benefits

• High performance motor or auxiliary feedback
• High accuracy and resolution
• Low bandwidth
• Maximum noise immunity
• One interface for all servo motor applications
• Standalone housing (suitable for mounting external to a servo

motor

Hiperface is a registered trademark of SICK Stegmann Gmb H

ATTENTION: Rockwell Automation Bulletin
2090 feedback cables provide connections
for both 5…12V and 7…12V encoder power
supplies. Only one of these connections
should be used. Simultaneous connection
to different power supplies may result in
damage to the servo drive and encoders.

Specifications

 Inrush current with 5…12 V supply can be as high as 1 Amp
 If applying the electronic type label, in connection with numeric controllers, attention

should be paid to Patent EP 425 912 B 2; Application of the electronic type label in
connection with speed regulation is exempt.

 Condensation not permissible
 To DIN EN 60068-2-27
 To DIN EN 60068-2-6
 With mating connector inserted

Certifications

CE Marked for all applicable directives

Electrical

# of sine/cosine cycles per revolution

1,024

Code format for absolute position value

Binary

Code direction with clockwise rotation viewed
from shaft end

Increasing

# of steps per revolution
(Single 842HR-S)

32,768

# of revolutions (Multi 842HR-M)

4,096

Error limits for the digital absolute value via RS
485

± 90 angular seconds

Error limits in evaluating the 1,024 signals,
integral non-linearity

± 45 angular seconds

Non-linearity within a sine/cosine period,
differential non-linearity

± 7 angular seconds

Output frequency for sine/cosine signals

0…200 kHz

Operating voltage range

7…12V; 5…12V

Max. operating current, no load
5…12V Supply
7…12V Supply

180 mA
80 mA

Available memory on EEPROM

128 bytes

Interface signals
Process data channel = SIN,
REFSIN, COS, REFCOS
Parameter channel = RS 485

Analog, differential

Digital

Mechanical

Max. angular acceleration

5 x 10

5

rad/sec

2

Max. operating speed

6,000 RPM

Operating torque, max.

3.5 oz-in

Starting torque, max.

5 oz-in

Shaft loading

Radial 35 lb; Axial 40 lb

Life of ball bearings

3.6 x 10

9

rotations

Environmental

Housing

Aluminum

Operating Temperature—C (F)

-20…+85° (-4…185°)

Storage Temperature—C (F)

-30…+90° (-22…194°)

Humidity 

90%

Shock 

30 g/11 ms

Vibration 

20 g/10…2 KHz

Protection 

IP66 (IEC 60529)

Approximate Weight

481 g (17 oz)

EMC

DIN EN 61000-6-2
DIN 6100-6-3