Additional Documentation:
 View the PDF version of this data sheet.
View the PDF version of the E7P assembly /disassembly instructions.
 View the web page version of the E7P assembly instructions.
View the web page version of the E7P disassembly instructions.
 Press Release (Product released on June 13th, 2007)
 Encoder FAQ
Description:
The E7P quick assembly optical incremental kit encoder is designed for high volume, low cost, mid-resolution OEM motion control applications. The E7P was designed as a big brother to the E4P encoder and offers higher resolutions, a wider range of shaft diameters, and mounts to additional bolt circles. The E7P uses a 5V supply and offers two channel TTL quadrature outputs. A single chip reflective encoder module incorporates an LED, monolithic detector and molded lenses. The phased array technology accepts far wider mechanical tolerance and misalignment than traditional aperture type encoders.
Two screws secure the base using one of three bolt circles. The precision machined aluminum spring-loaded reflective codewheel pushes on by hand using a spacing tool to securely grip the shaft while eliminating set screws. The cover snaps on to complete the assembly in seconds.
When mounting holes are not available, a centering tool and stick-on version is available. The T-option specifies a base with a transfer adhesive pre-applied. The backing is peeled off and the base is slid down the shaft guided by the centering tool.
The E7PS single-ended version has a 4-pin connector and is designed to drive cables up to six feet long.
The E7PD differential version has a 6-pin connector, is designed for longer cable lengths, and maximizes noise immunity. The internal 26C31 differential line driver can source and sink 20mA at TTL levels. The recommended receiver is industry standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 110 ohm resistor in series with a .0047mf capacitor placed across each differential pair. The capacitor simply conserves power. Otherwise power consumption would increase by approximately 20mA per pair, or 40mA for 2 pairs.
US Digital warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
| Click Image to View 3D Models |
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Package Specification Drawing:
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| Click drawing to enlarge
(109K) |
All dimensions shown are in inches |
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Mechanical Specifications:
| Parameter | Dimension | Units |
| Moment of Inertia | 6.48 x 10-5 | oz-in-s2 |
Required Shaft Length
With E-option
With H-option | 0.355 to 0.587
0.355 to 0.836
>=0.355 | in.
in.
in. |
Bolt Circle Mounting:
| Bolt Circle | Option to Specify | Screws Included* | Hex Tool Included* |
| 0.750" | - | low profile #4-40 x 1/4" | .050" hex driver |
| 1.280" | - | low profile #4-40 x 1/4" | .050" hex driver |
| 1.280" | 2-option | standard #2-56 x 1/4" | 5/64" hex wrench |
| 1.812" | G-option | standard #4-40 x 1/4" | 3/32" hex wrench |
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* The set of screws and hex tool included with each encoder depend on the option and bolt circle as shown above. |
Although standard socket head cap screws will work when mounting the E7P, to maximize clearance between the codewheel and the top of the screw head, we recommend low profile socket head cap screws when using the holes on the E7P board. Both standard or low profile socket head cap screws will work with the G-option.
| 0.750" Bolt Circle / Low Profile #4-40 x ": |
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| 1.280" Bolt Circle / Low Profile #4-40 x ": |
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| 1.280" Bolt Circle / #2-56 x " (2-option): |
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| Provides two #2-56 x " screws in place of two #4-40 x 1/4". |
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| 1.812" Bolt Circle / #4-40 x " (G-option): |
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| Provides mounting ears on the base allowing for a 1.812" bolt circle. |
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Transfer Adhesive Mounting (T-option):
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| Provides a transfer adhesive (with peel-off backing) that may be used when mounting holes are not available. A centering tool is required when using transfer adhesive. |
Shaft Length Options:
| Compact (C-option): |
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| Provides the lowest profile. |
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| Extension in Shaft (E-option): |
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| Provides an extension to the cover allowing for longer shafts of up to 0.836". |
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| Hole in Housing (H-option): |
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| Provides a 0.452" diameter hole to the cover allowing for shafts to pass through. |
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Absolute Maximum Ratings:
| Parameter | Min. | Max. | Units |
| Vibration (5 to 2kHz) | - | 20 | g |
| Shaft Axial Play | - | .020 | in. |
| Off-axis Mounting Tolerance | - | 0.010 | in. |
| Acceleration | - | 250,000 | rad/sec² |
| Operating Temperature | 0 | 85 | C |
| Storage Temperature | -40 | 85 | C |
| Relative Humidity | - | 90 | % |
Torque Specifications:
| Parameter | Torque |
| Base to Mounting Surface Screws | 2-3 in.-lbs. |
Materials:
| Part | Material |
| Base, Cover | 20% glass filled polycarbonate |
| Codewheel | Aluminum |
Phase Relationship:
A leads B for clockwise shaft rotation, and B leads A for counterclockwise rotation viewed from the cover/label side of the encoder (see the AEDR page).
Single-ended Electrical Specifications:
| Specifications | Min. | Typ. | Max. | Units | Notes |
| Supply Current | - | 21 | 27 | mA |
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| Current Voltage | 4.5 | - | 5.5 | Volts |
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| High Level Output | 2.4 | - | - | Volts | loh = -2mA |
| Low Level Output | - | - | 0.4 | Volts | lol = 8mA |
| Rise Time | - | 500 | - | ns | Cl = 25pf, R1 = 2.7 k Ohms |
| Fall Time | - | 100 | - | ns |
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| Frequency Response | - | - | 60 | kHz |
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For complete details see the AEDR page. |
Differential Electrical Specifications:
| Specifications | Min. | Typ. | Max. | Units | Notes |
| Supply Current | - | 22 | 30 | mA |
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| Current Voltage | 4.5 | - | 5.5 | Volts |
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| High Level Output | 2.4 | 3.4 | - | Volts | loh = -20mA |
| Low Level Output | - | 0.2 | 0.4 | Volts | lol = 20mA |
| Rise Time | - | 500 | - | ns |
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| Fall Time | - | 100 | - | ns |
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| Frequency Response | - | - | 60 | kHz |
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For complete details see the AEDR page. |
Encoding Characteristics:
| Parameter | Typ. | Max. | Units |
| Symmetry Error | 16 | 75 | e |
| Quadrature Error | 12 | 60 | e |
Timing Diagram:
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CPR (N):
The number of Cycles Per Revolution.
One Shaft Rotation:
360 mechanical degrees, N cycles.
One Electrical Degree (e):
1/360th of one cycle.
One Cycle (C):
360 electrical degrees (e). Each cycle can be decoded into 1 or 4 codes, referred
to as X1 or X4 resolution multiplication.
Symmetry:
A measure of the relationship between (X) and (Y) in electrical degrees, nominally
180e.
Quadrature (Z):
The phase lag or lead between channels A and B in electrical degrees, nominally 90e.
Position Error:
The difference between the actual shaft position and the position indicated by the
encoder cycle count.
Cycle Error:
An indication of cycle uniformity. The difference between an observed shaft angle
which gives rise to one electrical cycle, and the nominal angular increment of 1/N of
a revolution. |
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Accessories:
| Centering Tools (May need to order separately, only included with PKG3-packaging option). |
Part #: CTOOLA - (Shaft Diameter)
Description: This reusable tool provides a simple method for accurately centering the E7P base to the shaft. It is required when using the T-option.
Price: $5.25 ea. |
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| Spacer Tools (Do not need to order separately, included with ALL packaging options). |
Part #: SPACER-E7P
Description: Self-spacing tool for placement of hub. Round. Aluminum.
Price: $3.00 ea. |
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| Screws |
Part #: SCREW-2381
Description: 2-56 x 1/4" socket head cap screw
Quantity Required for Mounting: 2 per encoder
Price: $0.26 ea. |
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Part #: SCREW-9127
Description: 4-40 x 1/4" low profile socket head cap screw
Quantity Required for Mounting: 2 per encoder
Price: $0.26 ea. |
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Part #: SCREW-2394
Description: 4-40 x 1/4" socket head cap screw
Quantity Required for Mounting: 2 per encoder
Price: $0.26 ea. |
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Pin-outs:
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4-pin (E7PS) Single-ended: |
| Pin | Description |
| 1 | +5VDC power |
| 2 | A channel |
| 3 | Ground |
| 4 | B channel |
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6-pin (E7PD) Differential: |
| Pin | Description |
| 1 | Ground |
| 2 | A channel |
| 3 | A- channel |
| 4 | +5VDC power |
| 5 | B channel |
| 6 | B- channel |
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Attention: For wire descriptions see the 4-pin Micro or 6-pin Micro Cables / Connectors page.
Compatible Cables / Connectors:
The connector built into the encoder is Molex# 53048-0410.
The mating connector is made up of housing (Molex# 51021-0400) and 4 individual crimp-on pins (Molex# 50079-8100).
A special crimp tool (Molex# 63811-0300) is needed to install connector pins.
Attention:
Specify cable length when ordering.
Custom cable lengths are available. See the 4-pin Micro or 6-pin Micro Cables / Connectors page for more information.
Pricing & Ordering Information:
| Part # |
| E7P |
(Version) |
- |
(CPR) |
- |
(Shaft Diameter) |
- |
(Options) |
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(Packaging Options) |
| Examples: |
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E7PD-512-197-EG
E7PS-256-394-H
E7PD-256-394-H
E7PS-180-125-T
E7PD-180-125-T
E7PS-180-125-T |
Version:
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CPR:
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Shaft Diameter: |
S = Single-ended.
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D = Differential.
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180
200
250
256
360
400
500
512
600
625
720 |
| Code |
| Size |
118
125
156
157
187
197
237
250
312
315
375
394 |
3mm
1/8"
5/32"
4mm
3/16"
5mm
6mm
1/4"
5/16"
8mm
3/8"
10mm |
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Note: Use code when ordering. |
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Options: (specify in order shown)
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Packaging Options: |
C = Compact cover.
E = Adds an extension to cover.
H = Adds hole in cover.
G = Adds mounting "ears" to base to
allow for 1.812" bolt circle mounting.
T = Adds transfer adhesive to base.*
2 = Two #2-56 x " mounting screws. |
Blank (default) = Base, screws and PCBs are packaged
separately in bulk. One spacer tool and one hex tool
per 100 encoders.
PKG1 = Each encoder packaged individually. One spacer
tool and one hex tool per 100 encoders.
PKG2 = Each encoder packaged individually with one
spacer tool and one hex tool per encoder.
PKG3 = Each encoder packaged individually with one
spacer tool, one hex tool and one centering tool per
encoder.
Important:
When a centering tool is needed, it may be most cost
effective to use the default packaging option and to order
a centering tool separately. This is especially true when
ordering a single encoder. |
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* A centering tool is required when using this option. |
| E7PS Pricing: |
$37.90 / 1
$29.10 / 10
$23.33 / 50
$19.62 / 100 |
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| E7PD Pricing: |
$45.50 / 1
$34.92 / 10
$27.99 / 50
$23.54 / 100 |
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| Cost Modifiers: |
Add 10% for T-option.
Add $3.00 for PKG1-option.
Add $4.00 for PKG2-option.
Add $7.00 for PKG3-option. |
| Cables / Connectors: |
Cables / Connectors are NOT included and MUST be ordered separately.
For ordering information please see the Compatible Cables / Connectors section above. |
| All information is subject to change without notice. |
Last updated: Tuesday, 06-May-2008 15:46:23 PDT |
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Features
Pricing & Ordering Information
