US Digital

E4P OEM Miniature Optical Kit Encoder

Overview

  • Miniature size
  • Push-on hub - spring loaded collet design
  • Minimum shaft length of .375"
  • Fits shaft diameters of .059" to .250"
  • Accepts +/-.020" Axial shaft play
  • Off-axis mounting tolerance of .010"
  • Tracks from 0 to 30,000 cycles/sec
  • 100 to 360 cycles per revolution (CPR)
  • 400 to 1440 pulses per revolution (PPR)
  • Single +5V supply

The E4P miniature encoder is designed to provide digital quadrature encoder feedback for high volume applications with limited space constraints. The E4P version utilizes an innovative push-on...

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Product Specifications

Parameter Dimension Units
Moment of Inertia 3.0 x 10^-6 oz-in-s²
Mounting Screw Size #3-48 x 1/4" -
M-option Screw Size 2.5mm x 6mm -
Screw Bolt Circle Diameter .586 ±.002 in.
Required Shaft Length* .375 to .395 in.
Axial Length Codewheel .270 in.

* Includes axial play.

Parameter Min. Max. Units
Vibration (5 to 2kHz) - 20 g
Shaft Axial Play - .020 in.
Off-axis Mounting Tolerance - .010 in.
Acceleration - 250,000 rad/sec²
Storage Temperature -40 85 C
Relative Humidity - 90 %

A leads B for clockwise shaft rotation, B leads A for counter clockwise shaft rotation viewed from the shaft/bushing side of the encoder (see the AEDR page).

 For complete details see the AEDR page.

Parameter Torque
Base to Mounting Surface 2-3 in.-lbs.

H-option (Hole In Cover)

The H-option adds a hole in the cover for the shaft to pass through:

  • For shaft diameters of 1.5mm to 2.5mm, a 0.143" hole is supplied.
  • For shaft diameters of 3mm and 1/8", a 0.170" hole is supplied.
  • For shaft diameters of 5/32" to 5mm, a 0.242" hole is supplied.
  • For shaft diameters of 6mm and 1/4", a 0.295" hole is supplied.

L-option (Low Power Strobe)

To reduce the average power requirements, the L-option version of the E4P power can be strobed on just long enough to sample outputs A and B. This option is the same as our standard E4P, except the internal power bypass capacitor is not installed. The outputs settling time is typically 200 to 400 nano seconds after power up. The minimum sample frequency must be less than the maximum RPM X the CPR / 10.

M-option (Metric Mounting Screws)

Provides alternate metric 2.5mm x 6mm screws. When M-option is NOT specified the default is 3-48 x 1/4" screws.

T-option (Transfer Adhesive)

When mounting holes are not available, a pre-applied transfer adhesive (with peel-off backing) is available for "stick-on" mounting. Use the centering tool (above) to position the base. T-option specifies transfer adhesive.

Before installation, cleaning the mounting surface with alcohol is recommended to remove dust and oil.

Centering Tool

Part #: MCTOOL - (Shaft Diameter*)

Description: This reusable tool provides a simple method for accurately centering the E4P base onto the shaft.

Material: Aluminum.

Please note: A centering tool is highly recommended when using the T-option transfer adhesive.

* See Ordering Information below for available Shaft Diameters.

Spacer Tool

Part #: SPACER-E4P

Description: This reusable tool is used to properly space the codewheel from the encoder base. Provides air gap of 0.07" to 0.03".

Material: Aluminum.

Please note: Each order includes at least one spacer tool per 100 encoders.

Pin Description
1 +5VDC power
2 A channel
3 Ground
4 B channel

View the PDF version of this document.

  • e4pstep1.gif
    1. Base Mounting

    Place base onto shaft. Secure base to mounting surface using two screws.

    Transfer Adhesive:Peel off paper backing, place centering tool into center hole of base, slip centering tool onto shaft and slide base and centering tool down onto mounting surface as one piece. Press to form a good bond, then slip centering tool off shaft and continue with standard mounting instructions.

  • e4pstep2.gif
    2. Codewheel Placement

    Place codewheel onto shaft with pattern-side down towards base.

  • e4pstep3.gif
    3. Codewheel Installation

    Position spacer / installation tool onto codewheel. Spacer / installation tool provides an air gap of 0.07" 0.03". Press down firmly until tool bottoms out on base latching ears.

  • e4pstep4.gif
    4. Cover Installation

    Place housing (cover) on. With thumb and finger, squeeze ears together to insure that cover fully latches.

Product Description

Restriction of Hazardous Substances

The E4P miniature encoder is designed to provide digital quadrature encoder feedback for high volume applications with limited space constraints. The E4P version utilizes an innovative push-on codewheel which accepts shaft diameters of 1.5mm to .250".

The E4P encoder is the leader for high quantity OEM applications, but the E4 is the ideal choice when a set-screw codewheel encoder is required (see the E4 page).

The E4P miniature encoder base provides mounting holes for two 3-48 x 1/4" or two 2.5mm x 6mm screws on a .586" bolt circle. When mounting holes are not available, a pre-applied transfer adhesive (with peel-off backing) is available for "stick-on" mounting.

The encoder cover is easily snapped onto the base and is embossed with the connector pin-out.

The E4P series encoder can be connected by using a (high retention 4-conductor snap-in polarized 1.25mm pitch) connector. Mating cables and connectors (see the Cables / Connectors web page) are not included and are available separately.

Product Notes
  • Cables and connectors are not included and must be ordered separately.
  • US Digital warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
Related Documentation

Purchasing

Configure and Purchase

1. CPR
2. Bore
3. Power


4. Cover


5. Base



6. Packaging




Product Part Number
Quantity Price
1 $22.95
10 $18.04
50 $15.69
100 $13.83
Over 100 Call for quote
Quantity
Unit Price

$22.95

Subtotal

$22.95

For your convenience, use the above part number to order via phone 800.736.0194

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