HEDS-51X0/61X0 Series, HEDG-512X/612X Series
HEDM-512X/61XX Series
Two and Three Channel Codewheels
for use with Avago Technologies Optical Encoder Modules
Data Sheet
Description
Avago Technologies offers a wide variety of codewheels
for use with Avago Technologies’ HEDS-9000, HEDS-
9100, HEDS-9040, and HEDS-9140 series Encoder Mod-
ules. Designed for many environments, applications,
and budgets, Avago Technologies’ codewheels are avail-
able 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 temperature 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 tem-
perature of 70°C. Glass codewheels combine the best of
film and metal, offering a temperature rating of 100°C
and resolutions to 1024 CPR on a 28 mm diameter.
In addition, each material offers a specific reliability rat-
ing. It is important to consider the specific application
operating environment, long term operating condi-
tions, 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
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
•
Lead Free
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 code-
wheels offer both high temperature and higher resolu-
tion, but are also more expensive. Consider the follow-
ing rating table when choosing a codewheel material.
HEDS-XXXX
Metal Codewheels
-40°C to +100°C
-40°C to +100°C
Parameter
Storage
Temperature
Operating
Temperature
Humidity
Velocity
Shaft Axial Play
Shaft Eccentricity
Plus Radial Play
Acceleration
Symbol
T
S
T
A
HEDM-XXXX
Film Codewheels
-40°C to +70°C
-40°C to +70°C
non condensing
HEDG-XXXX
Glass Codewheels
-40°C to +100°C
-40°C to +100°C
30,000 RPM
±0.25 mm
(±0.010 in)
±0.1 mm
(±0.004 in) TIR
250,000 Rad/Sec
2
30,000 RPM
±0.175 mm
(±0.007 in)
±0.04 mm
(±0.0015 in) TIR
250,000 Rad/Sec
2
12,000 RPM
±0.175 mm
(±0.007 in)
±0.04 mm
(±0.0015 in) TIR
100,000 Rad/Sec
2
Recommended Operating Conditions
Parameter
Maximum Count Frequency
Shaft Perpendicularity
Plus Axial Play
Shaft Eccentricity Plus
Radial Play
HEDS-XXXX
Metal Codewheels
100 kHz
±0.25 mm
(±0.010 in)
±0.1 mm
(±0.004 in) TIR
HEDM-XXXX
Film Codewheels
200 kHz*
±0.175 mm
(±0.007 in)
±0.04 mm
(±0.0015 in) TIR
HEDG-XXXX
Glass Codewheels
200 kHz
±0.175 mm
(±0.007 in)
±0.04 mm
(±0.0015 in) TIR
Note: Avago Technologies 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
Encoding Characteristics
Encoding characteristics over recommended operating
range and recommended mounting 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.
Reliability
In addition to the absolute maximum specifications
of codewheels, the environment characteristics of the
application 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 ta-
ble shows results of lifetests under varying conditions
of temperature and humidity.
Symbol
∆C
∆θ
∆C
∆θ
∆C
∆θ
∆C
∆θ
∆C
∆θ
∆C
∆θ
Part Number
HEDS-51XX
HEDS-61XX
HEDM-512X
HEDM-61XX
HEDG-512X
HEDG-612X
Description
Cycle Error
Position Error
Cycle Error
Position Error
Cycle Error
Position Error
Cycle Error
Position Error
Cycle Error
Position Error
Cycle Error
Position Error
Min.
Typ.
3
10
3
7
3
4
3
2
3
4
3
2
Max.
5.5
40
5.5
20
7.5
40
7.5
20
7.5
30
7.5
15
Units
°e
min. of arc
°e
min. of arc
°e
min. of arc
°e
min. of arc
°e
min. of arc
°e
min. of arc
Glass Codewheel Tests
Test
Storage at 100°C
Rotating at 100°C
Temperature Cycle: -40°C to +100°C
Temperature/Humidity: 85°C/85% R.H.
Duration
1000 hours
500 hours
500 cycles
500 hours
Number of Parts
44
10
98
43
Number of Failures
0
0
0
0
Film Codewheel Tests
Test
Storage at 70°C
Rotating at 70°C
Temperature Cycle: -40°C to +70°C
Temperature Cycle: +20°C to +40°C
Temperature Cycle: +20°C to +55°C
Temperature Cycle: +20°C to +70°C
Duration
1000 hours
500 hours
500 cycles
1000 cycles
1000 cycles
500 cycles
Number of Parts
118
10
66
64
46
50
Number of Failures
0
0
0
0
0
0
3
Mounting Rotary Encoders with Codewheels
There are two orientations for mounting the Avago
Technologies encoder module and Avago Technologies
codewheel. Figure 1a shows mounting the module with
side A as the mounting plane. Figure 1b shows mount-
ing the module with side B as the mounting plane.
When assembling the encoder and codewheel, it is im-
portant to maintain the tolerances of Side A of the mod-
ule, and the image side of the codewheel. See module
Data Sheets for these tolerances.
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.
Mounting with Module Side B as the Mounting Plane,
using Avago Technologies Assembly Tools
Avago Technologies offers centering tools and gap set-
ting tools only for the case when the module is mount-
ed with Side B down. Please refer to the Ordering Infor-
mation Table to choose the correct assembly tools.
MODULE SIDE B
IMAGE SIDE
OF CODEWHEEL
MODULE SIDE A
IMAGE SIDE
OF CODEWHEEL
MODULE SIDE A
MODULE SIDE B
Figure 1a.
Figure 1b.
*Please note that the image side of the codewheel must always be facing the module Side A.
HEDS-51X0 fig 1a
4
Assembly Instructions Using Avago Technologies Assembly Tools
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 shim should not contact the codewheel boss.
b. Push codewheel down against gap setting shim.
The codewheel is now at the proper height.
c. Tighten codewheel setscrew.
IMAGE SIDE OF CODEWHEEL
CODEWHEEL
GAP SETTING SHIM
MODULE SIDE A
3. Insert mounting screws through module and thread
into the motor base. Do not tighten screws.
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.
CENTERING TOOL
ALIGNING RECESSES
MODULE SIDE A
CODEWHEEL
MODULE SIDE B
MODULE SIDE B
Figure 2. Alignment Tool is Used to Set Height of Codewheel.
HEDS-51X0 fig 2
Figure 3. Alignment Tool is Placed over Shaft and onto Codewheel Hub.
Alignment Tool Pins Mate with Aligning Recesses on Module.
5
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