Rockwell Automation 845K User Manual

Installation Instructions

Size 25 Incremental Encoder, Bulletin 845K

IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Specifications

Electrical

Code Format Incremental, 2 channels with zero index

Quadrature 90° ±22°

Symmetry 50% ±10%

Zero Index Channel 1/2 cycle, gated to channel B

Requirements

Frequency

Response

Operating Speed

Resolution Up to 5000 PPR on code disk

Output Drive

Capability

Channel A leads B CCW

Power

Determined by catalog number:

5V DC ±5% @ 150mA maximum
8-24V DC @ 150mA maximum

Data: 210 kHz
Zero index: 125 kHz

(210 kHz x 60)/pulses per revolution = RPM or

(Data)

6000 RPM, whichever is lower

PNP current source = 20mA
NPN current sink = 20mA
Differential line driver = ±20mA
NPN open collector = 20mA

Mechanical

Starting Torque

Running Torque

Moment of Inertia (0.08ozĆin2 maximum)

Slew Speed 6000 RPM

Shaft Loading Axial 20 lbs [89 N] (10 lbs 5000 PPR)

Shaft Size 3/8in [9.517 mm] diameter

1.0inĆoz typical [0.007 NDm]

1.0inĆoz typical [0.007 NDm]

Radial 40 lbs [178 N] (20 lbs 5000 PPR)

Environmental

Housing NEMA Type 1

Temperature +32°F to +140°F (0°C to +60°C) Ċ operating

Humidity 85%, noncondensing

Vibration 20 G's (5 to 2000 Hz)

Approximate

Shipping Weight

-13°F to +194°F (-25°C to +90°C) Ċ storage

Shock 50 G's (11ms duration)

2 lbs (0.91 kg)

Accessories

Description Part Number

High Performance Flexible Coupling 845-FC-*-*

Measuring Wheels 845-MW-A-*

Servo Clamps 845-SC

Differential Encoder Buffer Board 845-BB

*See C-111 catalog for selection.

Selection

845K — S A HZ1 4 CR Y 3

a b c d

a

Mounting Configuration

Code Description

Square FlangeD

H English Servo

b

Power Supply

Code Description

5V DC ±5%1

2 8-24V DC Unregulated

Ê DLD = Differential Line Driver

c

Output ConfigurationÊ

Code Description

PNP Current Source2

3 NPN Current Sink

DLD 5V DC RS-4224

5

Flexible Shaft Couplings

NPN Open Collector

24V DC Max

Code Description

CB 60

CF 80
CG 100

EB 180

CJ 250
CC 254

EG 300

CK 360
CL 400

DW 512

LG 900
CN 1000

EL 1200

CD 1250

RF 1280

FL 1600

DN 2000

HL 2400
CR 2500

CT 3600

DR

Ë See Shaft Loading specification

changes.

d

Resolution

50CA

64CE

120DB

200CH

256CW

500CM

600EH

1024FW

1800CP

2048CS

2540CY

5000Ê

Angle

Parallel
OffĆSet

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.

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.

Cable

Current Source, Current Sink, Open Collector Outputs

Wire Pair

Red/Black

White/Black

Blue/Black

Green/Black

Wire Color Function

Red DC+ Input

Black

White Channel A Output

Black

Blue Channel B Output

Black

Green Channel Z Output

Black Not Connected

Cable

Differential Line Driver Outputs

Wire Pair

Red/Black

White/Black

Blue/Black

Green/Black

Wire Color Function

Red DC+ Input

Black

White Channel A Output

Black

Blue Channel B Output

Black

Green Channel Z Output

Black Channel Z Output

Channel A Output

Channel B Output

DC Return

Not Connected

Not Connected

DC Return

Current Sink and Open Collector Output Waveform:

1 Cycle

90 +/- 22°

Channel A

Channel B

(Index) Channel Z

Current Source Output Waveform:

1 Cycle

90 +/- 22°

Channel A

Channel B

(Index) Channel Z

Differential Line Driver Output Waveform:

1 Cycle

90 +/- 22°

Channel A
Channel A

Channel B
Channel B

(Index)Channel Z

Channel Z

Logic 1

Logic 0

(CCW Rotation Shown)

Logic 1

Logic 0

(CCW Rotation Shown)

Logic 1

Logic 0

(CCW Rotation Shown)

Dimensions—inches (mm)

2.50 (63.5)
Max.

0.300
(7.62)

+ 0.0000

0.3747

- 0.0003

1.032 (26.21)

2.063

(52.40)

(9.517) Dia.

1.032

(26.21)

Square Flange Mount

2.063

(52.40)

2.62 (66.5)
Sq.

Pigtail

24 (610) Typ.

0.25 (6.35)

0.85/0.90

(21.59/22.86)

+ 0.000

1.250

(31.75) Dia.

- 0.001

0.21 (5) Dia.Ċ4 Mtg. Holes

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

0.3747

2.500

+ 0.0000

- 0.0003

+ 0.000

- 0.003

2.50 (63.5)
Max.

0.300 (7.62)

(9.517) Dia.

2.31 (58.67) Dia.

(63.50) Dia.

2.56 (65) Dia.

English Servo Mount

Pigtail

24 (610) Typ.

0.100 (2.54) Max.

0.100 ± 0.005 (2.54)

0.85/.90

(21.59/22.86)

+ 0.000

- 0.001

(31.75) Dia.

1.250

8-32 UNCĆ2B x 0.18 (4.6) Deep
on a 1.875 (47.6) Dia. Bolt Circle,
3 PlacesĊ120° Apart

Publication 75008–061–01(A)

October 1995

Printed in USA