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Installation Instructions

Bulletin 842A Absolute Encoders

IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Specifications

Electrical

Code Format Gray or Natural Binary

Code Direction CW or CCW

Symmetry 40% to 60%

Operating Voltage 10–32V DC

Power Requirements 150mA @ 5V (no load)

Max # of Steps/Revolution 8192

Max # of Revolutions 8192

Position Forming Time 0.5msec

Delay on Power Up 1050msec

Clock +, Clock - , Data +,

Data -

Synchronous Serial Interface (SSI) RS--422

CW/CCW “L”active(L=0--0.9V,H=1.9–24V))

Mechanical

Angular Acceleration 5x10

radians/sec

Moment of Inertia 5x10

-- 4

oz-in-sec

(35 gcm

)

Maximum Working Speed 6000 RPM at max shaft loading

Maximum Operating Speed 12,000 RPM

Starting To rque 3.5oz in (2.5 Ncm)

Shaft Loading Axial 11lb (50N)

Radial 67lb (300N)

Environmental

Housing Aluminum

Temperature

-- 2 0 _Cto85_C(--4_Fto185_F) operating

-- 4 0 _Cto100_C(--40_Fto212_F) max. working

-- 4 0 _Cto125_C(--40_Fto257_F) storage

Humidity 98% noncondensing

Protection NEMA Type 4, 13, IP67 (IEC 529): static shaft

NEMA Type 4, 13, IP66 (IEC 529): moving shaft

Shock 100g/6msec

Vibration 20g/58--2000Hz, 1.5mm displacement (10--58Hz)

Approximate Weight 0.5kg (18oz)

Selection

842A — 31 G B

b c

Code Type

Code Description

31 36mm Pilot, 10mm Shaft

56 50mm Pilot, 6mm Shaft

Code Type

Code Description

G Gray Code

N Natural Binary

A-B

Code

Pulses

Per Rev.

SSI Bits

MSB- LSB

No. of

Revs.

SSI Bits

MSB- LSB

A 8192 12--24 2048 1--11

B 4096 13--24 4096 1--12

C 2048 14--24 8192 1--13

D 4096 13--24 512 4--12

E 4096 13--24 256 5--12

Electrical Connections

The 842A comes with an M23 connector. The mating

connector, 845--12P, or pre-wired cable and connector

assembly 845--CA--G--* must be ordered separately. See

Encoder Accessories in the Sensors catalog.

Function

Pin Number Description

DC Return 1 Ground

Data + 2 SSI

Clock + 3 SSI

DC + Input 8 10--32V DC

150mA no load

Reset 9



Data -- 10 SSI

Clock -- 11 SSI

CW/CCW 12

See below 

 Reset to zero is enabled when Pin 9 is momentarily connected to DC+ Input.

 When pin 12 is connected to DC + (or left floating), the 842A will count UP when

the shaft is turned CW when looking at the shaft. When pin 12 is connected to DC

return, the 842A will count UP when the shaft is turned in the CCW direction when

looking at the shaft.

IMPORTANT: Wiringmustbeinaccordancewiththe

National Electric Code and applicable local

codes and ordinances.

Mounting Instructions

1. Be sure to select the proper size flexible coupling clamp to

mate to the encoder shaft, e.g., 845--FC--*--*. See

Encoder Accessories in Sensor catalog.

IMPORTANT: Do not rigidly connect the encoder shaft to

the machine; this will cause premature

failure of the encoder or machine bearings.

Always use a flexible coupling.

2. Use the dimension drawings to determine the encoder

mounting hole locations.

3. Slide the flexible coupling onto the shaft, but do not

tighten

the set screws.

4. Mount the encoder and tighten with three size M4

mounting screws (not supplied).

5. Center the flexible coupling and tighten the set screws.

6. Rotate the machine slowly and verify that the flexible

coupling is not deforming beyond specifications.

7. Align machine to its mechanical zero or home position.

Remove slotted cover located on the back of the encoder

and press the Reset button to make the encoder count

zero. Replace cover.

1 2

Indice de contenidos

Pagina 1 - Installation Instructions

Installation InstructionsBulletin 842A Absolute EncodersIMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.SpecificationsElectricalCode Format Gray or

Pagina 2 - Dimensions—mm

ResetTo reset the output of the encoder to zero turns and zero shaftposition, remove the slotted cover from the back of theencoder and press the butto

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Rockwell-automation 842A Absolute Encoder Manual de usuario

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