HEDS-5120#A11 - Hewlett-Packard / Agilent

2-127

MOTION SENSING

AND CONTROL

Two and Three Channel

Codewheels for use with HP

Optical Encoder Modules

Technical Data

Features:

• Codewheels Available in

Glass, Film, and Metal

• Available in Two Standard

Diameters

• Cost Effective

• Resolutions from 96 CPR to

2048 CPR

• For Use with HEDS-90XX/

91XX Series Two and Three

Channel Encoders

Description

Hewlett-Packard offers a wide

variety of codewheels for use

with Hewlett-Packard’s HEDS-

9000, HEDS-9100, HEDS-9040,

and HEDS-9140 series Encoder

Modules. Designed for many

environments, applications, and

budgets, HP codewheels are

available in Glass, Film, and

Metal. These codewheels are

available in resolutions from 96

Counts Per Revolution (CPR) to

1024 CPR on an 11 mm optical

radius and 500 to 2048 CPR on a

23.36 mm optical radius.

Each of the three codewheel

materials offers a certain

advantage. Metal codewheels are

the most versatile, with a tem-

perature rating up to 100°C,

resolution to 512 CPR (28 mm

diameter), as well as 2 and 3

channel outputs. Film codewheels

offer higher resolution (up to

1024 CPR on a 28 mm diameter)

with an operating temperature of

70°C. Glass codewheels combine

the best of film and metal, offer-

ing a temperature rating of 100°C

and resolutions to 1024 CPR on a

28 mm diameter.

In addition, each material offers a

specific reliability rating. It is

important to consider the specific

application operating environ-

ment, long term operating

conditions, and temperature

ranges when choosing a code-

wheel material.

Also See:

• HEDS-9000/HEDS-9100

Encoder Module Data Sheet

• HEDS-9000/9100/9200

Extended Resolution Encoder

Module Data Sheet

• HEDS-9040/9140 Three

Channel Encoder Module Data

Sheet

• HEDS-9700 Small Encoder

Module Data Sheet

HEDS-51X0/61X0 Series

HEDG-512X/612X Series

HEDM-512X/61XX Series

5965-5891E

2-128

HEDS-XXXX HEDM-XXXX HEDG-XXXX

Parameter Symbol Metal Codewheels Film Codewheels Glass Codewheels

Storage TS-40°C to +100°C -40°C to +70°C -40°C to +100°C

Temperature

Operating TA-40°C to +100°C -40°C to +70°C -40°C to +100°C

Temperature

Humidity non condensing

Velocity 30,000 RPM 30,000 RPM 12,000 RPM

Shaft Axial Play ±0.25 mm ±0.175 mm ±0.175 mm

(±0.010 in) (±0.007 in) (±0.007 in)

Shaft Eccentricity ±0.1 mm ±0.04 mm ±0.04 mm

Plus Radial Play (±0.004 in) TIR (±0.0015 in) TIR (±0.0015 in) TIR

Acceleration 250,000 Rad/Sec2250,000 Rad/Sec2100,000 Rad/Sec2

Absolute Maximum

Ratings

It is important to consider the

environment in which the

codewheels will be used when

selecting a codewheel material. In

brief, metal codewheels are

rugged, but do not offer higher

resolution capabilities. Film

codewheels allow higher

resolution, but cannot endure the

same temperatures and high

humidity as metal. Glass

codewheels offer both high

temperature and higher

resolution, but are also more

expensive. Consider the following

rating table when choosing a

codewheel material.

Recommended Operating Conditions

HEDS-XXXX HEDM-XXXX HEDG-XXXX

Parameter Metal Codewheels Film Codewheels Glass Codewheels

Maximum Count Frequency 100 kHz 200 kHz* 200 kHz

Shaft Perpendicularity ±0.25 mm ±0.175 mm ±0.175 mm

Plus Axial Play (±0.010 in) (±0.007 in) (±0.007 in)

Shaft Eccentricity Plus ±0.1 mm ±0.04 mm ±0.04 mm

Radial Play (±0.004 in) TIR (±0.0015 in) TIR (±0.0015 in) TIR

Note: HP Encoder Modules are guaranteed to 100 kHz, but can operate at higher frequencies. See Encoder Module Data Sheet for

specifications and output load recommendations.

*HEDM-6140 is guaranteed to 100 kHz with the HEDS-9040 #T00 module.

2-129

MOTION SENSING

AND CONTROL

Encoding Characteristics

Encoding characteristics over

recommended operating range

and recommended mounting

Part Number Description Symbol Min. Typ. Max. Units

HEDS-51XX Cycle Error ∆C 3 5.5 °e

Position Error ∆θ 10 40 min. of arc

HEDS-61XX Cycle Error ∆C 3 5.5 °e

Position Error ∆θ 7 20 min. of arc

HEDM-512X Cycle Error ∆C 3 7.5 °e

Position Error ∆θ 4 40 min. of arc

HEDM-61XX Cycle Error ∆C 3 7.5 °e

Position Error ∆θ 2 20 min. of arc

HEDG-512X Cycle Error ∆C 3 7.5 °e

Position Error ∆θ 4 30 min. of arc

HEDG-612X Cycle Error ∆C 3 7.5 °e

Position Error ∆θ 2 15 min. of arc

Reliability

In addition to the absolute

maximum specifications of

codewheels, the environment

characteristics of the application

Glass Codewheel Tests

Test Duration Number of Parts Number of Failures

Storage at 100°C 1000 hours 44 0

Rotating at 100°C 500 hours 10 0

Temperature Cycle: -40°C to +100°C 500 cycles 98 0

Temperature/Humidity: 85°C/85% R.H. 500 hours 43 0

Film Codewheel Tests

Test Duration Number of Parts Number of Failures

Storage at 70°C 1000 hours 118 0

Rotating at 70°C 500 hours 10 0

Temperature Cycle: -40°C to +70°C 500 cycles 66 0

Temperature Cycle: +20°C to +40°C 1000 cycles 64 0

Temperature Cycle: +20°C to +55°C 1000 cycles 46 0

Temperature Cycle: +20°C to +70°C 500 cycles 50 0

tolerances unless otherwise

specified. Values are for worst

error over a full rotation. Please

refer to Encoder Module Data

Sheet for definitions of Encoding

characteristics.

are also important. For example,

consistent, large temperature

swings over the life of the product

will affect the codewheel

performance characteristics

depending on the material. The

following reliability table shows

results of lifetests under varying

conditions of temperature and

humidity.

2-130

Mounting with Module

Side A as the Mounting

Plane

Mounting a high resolution or

three channel encoder with

Module Side A as the mounting

plane requires alignment pins in

the motor base. These alignment

pins provide the necessary

centering of the module with

respect to the center of the motor

shaft. In addition to centering, the

codewheel gap is also important.

Please refer to the respective

encoder data sheet for necessary

mounting information.

*Please note that the image side of the codewheel must always be facing the module Side A.

Figure 1b shows mounting the

module with side B as the mount-

ing plane. When assembling the

encoder and codewheel, it is

important to maintain the

tolerances of Side A of the

module, and the image side of the

codewheel. See module Data

Sheets for these tolerances.

Figure 1a. Figure 1b.



MODULE SIDE B

MODULE SIDE A

IMAGE SIDE

OF CODEWHEEL

IMAGE SIDE

OF CODEWHEEL MODULE SIDE A

MODULE SIDE B





Mounting Rotary

Encoders with

Codewheels

There are two orientations for

mounting the HP encoder module

and HP codewheel. Figure 1a

shows mounting the module with

side A as the mounting plane.

Mounting with Module

Side B as the Mounting

Plane, using HP Assembly

Tools

Hewlett-Packard offers centering

tools and gap setting tools only

for the case when the module is

mounted with Side B down.

Please refer to the Ordering

Information Table to choose the

correct assembly tools.

2-131

MOTION SENSING

AND CONTROL

Figure 2. Alignment Tool is Used to Set Height of

Codewheel.

Assembly Instructions

Using HP Assembly Tools

Figure 3. Alignment Tool is Placed over Shaft and onto

Codewheel Hub. Alignment Tool Pins Mate with

Aligning Recesses on Module.

CENTERING TOOL

CODEWHEEL

ALIGNING RECESSES

MODULE SIDE A

MODULE SIDE B





IMAGE SIDE OF CODEWHEEL

GAP SETTING SHIM

CODEWHEEL

MODULE SIDE A

MODULE SIDE B





shim should not contact the

codewheel boss.

(b) Push codewheel down

against gap setting shim. The

codewheel is now at the proper

height.

setscrew.

3. Insert mounting screws

through module and thread

into the motor base. Do not

tighten screws.

Instructions

1. Place codewheel on shaft.

2. Set codewheel height:

(a) Place the correct gap

setting tool (per Ordering

Information Table) on motor

base, flush up against the

motor shaft as shown in Figure

2. The shim has two different

size steps. Choose the one that

most closely matches the width

of the codewheel boss. The

4. Slide the HEDS-8905 or HEDS-

8906 centering tool over

codewheel hub and onto

module as shown in Figure 3.

The pins of the alignment tool

should fit snugly inside the

alignment recesses of the

module.

5. While holding alignment tool in

place, tighten screws down to

secure module.

6. Remove alignment tools.

2-132

Mechanical Drawings

Figure 4. HEDS-5120 Codewheel. Figure 5. HEDS-6100 Codewheel.

Figure 6. HEDS-5140 Codewheel Used with HEDS-9140.

5.95

(0.234)

MAX.

12.70

(0.500)

MAX.

10.16

(0.400)

130° ± 5° 

TYPICAL

INDEX PULSE

POSITION

INDEX PULSE

REFERENCE

MARKER

25.7 (1.01)

DIA. MAX.

1.80

(0.071)

SETSCREW

3.58

(0.141)

MOUNTING BOSS

= 11.00 mm (0.433 in.)

DIMENSIONS IN MM (INCHES)

26.67

(1.050)

MAX.

18.0

(0.71)

50.0 (1.97)

DIA.

8.99

(0.354)

MAX.

MOUNTING

BOSS

DIMENSIONS IN MM (INCHES)

# 2-56 SETSCREW

USE 0.035" HEX WRENCH

0.20

(0.008)

5.94

(0.234)

MAX.

12.70

(0.500)

MAX.

10.16

(0.400)

1.80

(0.071)

3.58

(0.141)

MOUNTING BOSS –

NOT USED ON

6 mm & 1/4"

I.D. HUBS

DIMENSIONS IN MM (INCHES)

# 2-56 SETSCREW

USE 0.035"

HEX WRENCH

25.40 (1.000) MAX.

0.04 MAX.

0.054

2-133

MOTION SENSING

AND CONTROL

Figure 7. HEDS-6140 Codewheel Used with HEDS-9040.

Figure 9. HEDM-6120 Codewheel/HEDM-6121 Codewheel.Figure 8. HEDM-5120 Codewheel/HEDM-5121 Codewheel.

26.67

(1.050)

MAX.

18.0

(0.71)

130°

TYPICAL

INDEX PULSE

POSITION

INDEX PULSE

REFERENCE

MARKER

50.6 (1.99)

DIA. MAX.

SETSCREW

8.99

(0.354)

MAX.

MOUNTING BOSS

= 23.36 mm (0.920 in.)

DIMENSIONS IN MM (INCHES)

# 2-56 SETSCREW

USE 0.035" HEX WRENCH



0.18

(0.007)

2-56 SETSCREW

USE 0.035" HEX WRENCH

5.9 MAX.

10.2 MAX.

12.6 MAX.

ARTWORK SIDE

(HEDM-5120)

ARTWORK SIDE

(HEDM-5121)

DIA.

MAX.

25.56

(1.006)

DIMENSIONS IN mm (INCHES)



15.3 MAX.

4.2 MAX.

0.18

(0.007)

2-56 SETSCREW

USE 0.035" HEX WRENCH

8.5 MAX.

22.50

(0.886)MAX.

ARTWORK SIDE

(HEDM-6120)

ARTWORK SIDE

(HEDM-6121)

DIA.

MAX.

50.48

(1.980)

DIMENSIONS IN mm (INCHES)



36.5 18 MAX.

2-134

Figure 10. HEDG-5120 Codewheel/HEDG-5121 Codewheel. Figure 11. HEDG-6120 Codewheel/HEDG-6121 Codewheel.

Figure 12. HEDM-6140 Codewheel/HEDM-6141 Codewheel.



0.55

(0.022)

2-56 SETSCREW

USE 0.035" HEX WRENCH

5.51

(0.217)

10.2 MAX.

ARTWORK SIDE

(HEDG-5120)

ARTWORK SIDE

(HEDG-5121)

DIA.

MAX.

25.56

(1.006)

DIMENSIONS IN mm (INCHES)

12.6 MAX.

0.55

(0.022)

2-56 SETSCREW

USE 0.035" HEX WRENCH

8.43

(0.332)

17.98

(0.708)MAX.

ARTWORK SIDE

(HEDG-6120)

ARTWORK SIDE

(HEDG-6121)

DIA.

MAX.

50.48

(1.987)

DIMENSIONS IN mm (INCHES)



22.6 MAX. 25.4 MAX.

0.18

(0.007)

2-56 SETSCREW

USE 0.035" HEX WRENCH

8.43

(0.332)

22.50

(0.886)MAX.

ARTWORK SIDE

(HEDM-6140)

ARTWORK SIDE

(HEDM-6141)

DIA.

MAX.

50.48

(1.987)

DIMENSIONS IN mm (INCHES)



36.5

130°

TYPICAL

INDEX PULSE

POSITION

SETSCREW

2-135

MOTION SENSING

AND CONTROL

Ordering Information Encoder Modules, Codewheel and Assembly Tools

HEDS-9100 option

modules

HEDS-5120

codewheels

0Option

Resolution

(Cycles/Rev)

S - 50 CPR

K - 96 CPR

C - 100 CPR

D - 192 CPR

E - 200 CPR

F - 256 CPR

G - 360 CPR

H - 400 CPR

A - 500 CPR

I - 512 CPR

Shaft Diameter

01 - 2 mm

02 - 3 mm

03 - 1/8 in.

04 - 5/32 in.

05 - 3/16 in.

06 - 1/4 in.

11 - 4 mm

14 - 5 mm

12 - 6 mm

13 - 8 mm

Rop = 11 mm,

2 channels

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8905 8901

HEDS-9140 option

modules

HEDS-5140

codewheels

0Option

Shaft Diameter

01 - 2 mm

02 - 3 mm

03 - 1/8 in.

04 - 5/32 in.

05 - 3/16 in.

06 - 1/4 in.

11 - 4 mm

14 - 5 mm

12 - 6 mm

13 - 8 mm

Rop = 11 mm,

3 channels

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8905 8905

Resolution

(Cycles/Rev)

S - 50 CPR

K - 96 CPR

C - 100 CPR

E - 200 CPR

F - 256 CPR

G - 360 CPR

H - 400 CPR

A - 500 CPR

I - 512 CPR

HEDS-9000 option

modules

HEDS-6100

codewheels

0Option

Shaft Diameter

05 - 3/16 in.

06 - 1/4 in.

07 - 5/16 in.

08 - 3/8 in.

09 - 1/2 in.

10 - 5/8 in.

11 - 4 mm

12 - 6 mm

13 - 8 mm

Rop = 23 mm,

2 channels

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8906 8901

Resolution

(Cycles/Rev)

A - 500 CPR

B - 1000 CPR

Metal Codewheels

2-136

HEDS-9040 option

modules

HEDS-6140

codewheels

0Option

Resolution

(Cycles/Rev)

B - 1000 CPR

J - 1024 CPR

Shaft Diameter

05 - 3/16 in.

06 - 1/4 in.

07 - 5/16 in.

08 - 3/8 in.

09 - 1/2 in.

10 - 5/8 in.

11 - 4 mm

12 - 6 mm

13 - 8 mm

Rop = 23 mm,

3 channels

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8906 8906

Ordering Information (Cont’d.)

Note:

1. For the lower resolution, two channel encoders, (11 mm ≤ 512 CPR; 23 mm ≤ 1024 CPR) the centering tool and gap-settting shim

are not necessary, but sometimes helpful in an assembly process.

HEDS-9100

modules

option

Film Codewheels

Artwork Orientation

0 - Artwork on hub

side (Use when

module side B is

down)

1 - Artwork opposite

hub side (use when

module side A is

down)

Resolution

(Cycles/Rev)

B - 1000 CPR

J - 1024 CPR

Shaft Diameter

01 - 2 mm

02 - 3 mm

03 - 1/8 in.

04 - 5/32 in.

05 - 3/16 in.

06 - 1/4 in.

11 - 4 mm

14 - 5 mm

12 - 6 mm

13 - 8 mm

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8905 8901

Rop = 11 mm,

2 channels

HEDM-512

codewheels

option

2-137

MOTION SENSING

AND CONTROL

HEDS-9000

modules

option

HEDM-612

codewheels

option

Artwork Orientation

0 - Artwork on hub

side (Use when

module side B is

down)

1 - Artwork opposite

hub side (use when

module side A is

down)

Resolution

(Cycles/Rev)

T - 2000 CPR

U - 2048 CPR

Shaft Diameter

05 - 3/16 in.

06 - 1/4 in.

07 - 5/16 in.

08 - 3/8 in.

09 - 1/2 in.

10 - 5/8 in.

11 - 4 mm

12 - 6 mm

13 - 8 mm

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8906 8906

Rop = 23 mm,

2 channels

HEDS-9040

modules

option

HEDM-614

codewheels

option

Artwork Orientation*

0 - Artwork on hub

side (Use when

module side B is

down)

1 - Artwork opposite

hub side (use when

module side A is

down)

Resolution

(Cycles/Rev)

T - 2000 CPR

Shaft Diameter

05 - 3/16 in.

06 - 1/4 in.

07 - 5/16 in.

08 - 3/8 in.

09 - 1/2 in.

10 - 5/8 in.

11 - 4 mm

12 - 6 mm

13 - 8 mm

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8906 8906

Rop = 23 mm,

3 channels

Ordering Information (Cont’d.)

*Index will not work if wrong orientation is used.

2-138

Ordering Information (Cont’d.)

Glass Codewheels

HEDS-9100

modules

option

HEDG-512

codewheels

option

Artwork Orientation

0 - Artwork on hub

side (Use when

module side B is

down)

1 - Artwork opposite

hub side (use when

module side A is

down)

Resolution

(Cycles/Rev)

B - 1000 CPR

J - 1024 CPR

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8905 8932

Rop = 11 mm,

2 channels

HEDS-9000

modules

option

HEDG-612

codewheels

option

Artwork Orientation

0 - Artwork on hub

side (Use when

module side B is

down)

1 - Artwork opposite

hub side (use when

module side A is

down)

Resolution

(Cycles/Rev)

T - 2000 CPR

U - 2048 CPR

Assembly Tools

Centering Gap-Setting

HEDS- HEDS-

8906 8932

Rop = 23 mm,

2 channels

Shaft Diameter

05 - 3/16 in.

06 - 1/4 in.

07 - 5/16 in.

08 - 3/8 in.

09 - 1/2 in.

10 - 5/8 in.

11 - 4 mm

12 - 6 mm

13 - 8 mm

Shaft Diameter

01 - 2 mm

02 - 3 mm

03 - 1/8 in.

04 - 5/32 in.

05 - 3/16 in.

06 - 1/4 in.

11 - 4 mm

14 - 5 mm

12 - 6 mm

13 - 8 mm