E3 Features
- Quick, simple assembly, and disassembly
- Rugged screw-together housing
- Accepts .010 in. axial shaft play
- Small size
- 64 to 10,000 cycles per revolution (CPR)
- 256 to 40,000 pulses per revolution (PPR)
- 2 channel quadrature TTL squarewave outputs
- Optional index (3rd channel)
E3 Product Description
The E3 is a high-resolution rotary encoder with a rugged glass-filled polymer enclosure, which utilizes either a 5-pin locking or standard connector. This optical incremental encoder is designed to easily mount to and dismount from an existing shaft to provide digital feedback information.
The internal components consist of a mylar disk mounted to a precision machined aluminum hub and an encoder module. The hub is available for diameters up to 1 in. The module contains a highly collimated solid-state light source and monolithic phased array sensor, which together provide a system extremely tolerant to mechanical misalignments.
The E3 is normally designed for applications of 10 feet or less. For applications requiring longer cable lengths, we recommend adding a PC4 / PC5 differential line driver or check out our E6 which has an optional differential output.
Attachment of the base to a surface may be accomplished by utilizing one of several machine screw bolt circle options. Positioning of the base to the centerline of a shaft is ensured by use of a centering tool. The cover is securely attached to the base with two 4-40 flat head screws to provide a resilient package protecting the internal components.
Connection to the E3 product is made through either a 5-pin locking or standard connector. The mating connectors are available from US Digital with several cable options and lengths.
Mechanical Drawings
Specifications
ENVIRONMENTAL
| PARAMETER | VALUE | UNITS |
|---|---|---|
| Operating Temperature, CPR < 2000 | -40 to 100 | C |
| Operating Temperature, CPR ≥ 2000 | -25 to 100 | C |
| Electrostatic Discharge, IEC 61000-4-2 | ± 4 | kV |
| Vibration (10Hz to 2kHz, sinusoidal) | 20 | G |
| Shock (6 milliseconds, half-sine) | 75 | G |
MECHANICAL
| PARAMETER | VALUE | UNITS |
|---|---|---|
| Max. Shaft Axial Play | ±0.010 | in. |
| Max. Shaft Runout | 0.004 T.I.R. | in. |
| Max. Acceleration | 250000 | rad/sec² |
| For CPR ≤ 2500: Max. RPM (1) Max. A/B Frequency e.x. CPR=2500, Max. RPM=7200 e.x. CPR=100, Max. RPM=60000 |
minimum value of ((18 x 10^6) / CPR) and (60000) 300 |
RPM kHz |
| For CPR = 3600, 4000, 4096, 5000: Max. RPM (1) Max. A/B Frequency |
(21.6 x 10^6) / CPR 360 |
RPM kHz |
| For CPR = 7200, 8000, 8192, 10000: Max. RPM (1) Max. A/B Frequency |
(43.2 x 10^6) / CPR 720 |
RPM kHz |
| Typical Product Weight | 1.28 | oz. |
| Codewheel Moment of Inertia | 8.9 x 10^-5 for bore < 12mm 4.0 x 10^-4 for bore ≥ 12 mm |
oz-in-s² |
| Hub Set Screw | #3-48 or #4-48 | |
| Hex Wrench Size | 0.050 | in. |
| Encoder Base Plate Thickness | 0.135 | in. |
| 3 Mounting Screw Size | #0-80 | |
| 3 Screw Bolt Circle Diameter (2) | 0.823 ± 0.005 | in. |
| 2 Mounting Screw Size | #2-56 or #4-40 | |
| 2 Screw Bolt Circle Diameter | 0.750 ± 0.005 | in. |
| 2 Screw Bolt Circle Diameter | 1.280 ± 0.005 | in. |
| 2 Screw Bolt Circle Diameter | 1.812 ± 0.005 | in. |
| Required Shaft Length (3) With E-option (2) With H-option |
0.445 to 0.525 0.445 to 0.670 > 0.445 |
in. in. in. |
| Index alignment to hub set screw | 180 ± Typical | degrees |
| Technical Bulletin TB1001 - Shaft and Bore Tolerances | Download | |
(1) 60000 RPM is the maximum rpm due to mechanical considerations. The maximum RPM due to the module's maximum frequency response is dependent upon the module’s resolution (CPR).
(2) Only for shaft diameters < 0.472".
(3) Add 0.125" to all required shaft lengths when using M-option.
TORQUE SPECIFICATIONS
| PARAMETER | VALUE | TORQUE |
|---|---|---|
| Hub Set Screw | 2-3 | in-lbs |
| Cover Screw | 2-4 | in-lbs |
| Base Mounting Screw (#0-80) | 1-2 | in-lbs |
| Base Mounting Screw (#2-56) | 2-3 | in-lbs |
| Base Mounting Screw (#4-40) | 4-6 | in-lbs |
| Adapter Plate Mounting Surface (#2-56 screws) | 2-3 | in-lbs |
| Adapter Plate Mounting Surface (#4-40 screws) | 4-6 | in-lbs |
| Module Mounting Screw | 3.5-4 | in-lbs |
PHASE RELATIONSHIP
A leads B for clockwise shaft rotation, and B leads A for counterclockwise rotation viewed from the cover side of the encoder.
ELECTRICAL
- Specifications apply over the entire operating temperature range.
- Typical values are specified at Vcc = 5.0Vdc and 25°C.
- For complete details, see the EM1 and EM2 product pages.
| PARAMETER | MIN. | TYP. | MAX. | UNITS | CONDITIONS |
|---|---|---|---|---|---|
| Supply Voltage | 4.5 | 5.0 | 5.5 | V | |
| Supply Current | 27 | 33 | mA | CPR < 1000, no load | |
| 54 | 62 | mA | CPR ≥ 1000 and < 3600, no load | ||
| 72 | 85 | mA | CPR ≥ 3600, no load | ||
| Low-level Output | 0.5 | V | IOL = 8mA max., CPR < 3600 | ||
| 0.5 | mA | IOL = 5mA max., CPR ≥ 3600 | |||
| 0.05 | mA | no load, CPR < 3600 | |||
| 0.25 | mA | no load, CPR ≥ 3600 | |||
| High-level Output | 2.0 | V | IOH = -8mA max., CPR < 3600 | ||
| 2.0 | V | IOH = -5mA max., CPR ≥ 3600 | |||
| 4.8 | V | no load, CPR < 3600 | |||
| 3.5 | V | no load, CPR ≥ 3600 | |||
| Output Current Per Channel | -8 | 8 | mA | CPR < 3600 | |
| -5 | 5 | mA | CPR ≥ 3600 | ||
| Output Rise Time | 110 | nS | CPR < 3600 | ||
| 50 | nS | CPR ≥ 3600 | |||
| Output Fall Time | 35 | nS | CPR < 3600 | ||
| 50 | nS | CPR ≥ 3600 |
ACCESSORIES
1. Centering Tool
The centering tool is only included with the -3 packaging option. It has to be ordered separately for other packaging options.
Part #: CTOOL - (Shaft Diameter)
Description: This reusable tool provides a simple method for accurately centering the E3 base onto the shaft in order to promote concentricity and thus, higher accuracy. It is recommended for the following situations:
- When using mounting screws smaller than #4-40.
- When the position of the mounting holes is in question.
- When using the 3-hole mounting pattern.
- When using the T-option transfer adhesive.
Instructions: When mounting encoder base, slide centering tool down shaft until it slips into centering hole of encoder base. Tighten mounting screws, then remove centering tool.
2. Hex Tool
Depending on the order packaging option, either a hex driver or hex wrench is included.
Part #: HEXD-050
Description: Hex driver, 0.050" flat-to-flat for #3-48 or #4-48 set screws. Only included with -B or -1 packaging options.
Part #: HEXW-050
Description: Hex wrench, 0.050" flat-to-flat for #3-48 or #4-48 set screws. Only included with -2 or -3 packaging options.
3. Spacer Tool
A spacer tool is included for all packaging options.
Part #: SPACER-E3S
Description: For shafts ≤ 0.394"
Part #: SPACER-E3L
Description: For shafts 12mm - 1"
4. Screws
Part #: SCREW-080-250-PH
Description: Pan Head, Philips #0-80 UNF x 1/4"
Use: Base Mounting
Quantity Required: 3
Screws are not included
Part #: SCREW-256-250-PH
Description: Pan Head, Philips #2-56 UNC x 1/4"
Use: Base Mounting
Quantity Required: 2
Screws are not included
Part #: SCREW-348-125-SS
Description: Socket Head Set Screw, 3-48 UNC x 1/8"
Use: Hub/Disk Mounting for 12mm - 1" Bore
Quantity Required: 2
Screws are included
Part #: SCREW-440-250-PH
Description: Pan Head, Philips #4-40 UNC x 1/4"
Use: Base Mounting
Quantity Required: 2
Screws are not included
Part #: SCREW-440-500-PH
Description: Pan Head, Phillips #4-40 UNC x 1/2"
Use: Module Mounting
Quantity Required: 2
Screws are included
Part #: SCREW-440-625-FH
Description: Flat Head, Phillips 4-40 UNC x 5/8"
Use: Cover Mounting
Quantity Required: 2
Screws are included
Part #: SCREW-448-063-SS
Description: Socket Head Set Screw, 4-48 UNC x 1/16"
Use: Hub/Disk Mounting for 5/16" - 10mm Bore
Quantity Required: 1
Screw is included
Part #: SCREW-448-125-SS
Description: Socket Head Set Screw, 4-48 UNC x 1/8"
Use: Hub/Disk Mounting for 2mm - 1/4" Bore
Quantity Required: 1
Screw is included
OUTPUT WAVEFORMS
Notes
- US Digital® warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
- Cables and connectors are not included and must be ordered separately.
Configuration Options |
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| E3 | - | CPR (Cycles Per Revolution) 64 100 200 400 500 512 1000 1024 1800 2000 2048 2500 3600 4000 4096 5000 7200 8000 8192 10000 | - | Bore Size 079 (2.0mm) 118 (3.0mm) 125 (1/8") 156 (5/32") 157 (4.0mm) 188 (3/16") 197 (5.0mm) 236 (6.0mm) 250 (1/4") 313 (5/16") 315 (8.0mm) 375 (3/8") 394 (10.0mm) 472 (12.0mm) 500 (1/2") 551 (14.0mm) 625 (5/8" Bore) 750 (3/4" Bore) 787 (20.0mm) 875 (7/8") 984 (25.0mm) 1000 (1") | - | Index IE (Index) NE (Non-Index) | - | Cover D (Default) E (Extended) H (Through-Hole) | - | Base D (Default) M (3" Diameter Bolt Circle) | - | Packaging B (Encoders packaged in bulk. Every order includes one centering tool, hex tool and spacer tool. An additional set of tools is included for each 100 encoders ordered.) 1 (Encoders packaged individually. Every order includes one centering tool, hex tool and spacer tool. An additional set of tools is included for each 100 encoders ordered.) 3 (Encoders packaged individually. Every order includes one centering tool, hex tool and spacer tool per encoder.) | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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PLEASE NOTE: This chart is for informational use only. Certain product configuration combinations are not available. Visit the E3 product page for pricing and additional information. |
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