US Digital

E8P OEM Optical Kit Encoder

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Overview

  • Subminiature size, easy installation
  • Single-ended or differential output option
  • A and B quadrature TTL outputs
  • Fits shaft diameters from 0.118" (3mm) to 0.276" (7mm)
  • Accepts +/- 0.020" axial shaft play
  • Off-axis mounting tolerance of 0.010"
  • Count frequency from DC to 60 kHz
  • 180 to 512 cycles per rev (CPR)
  • 720 to 2048 quadrature states per rev.
  • Single +5V supply

The E8P optical incremental kit encoder is designed for high volume, low cost, mid-resolution OEM motion control applications. The E8P is small enough for a NEMA...

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Product Specifications

ParameterValueUnits
Moment of Inertia 1.069 x 10-6 max. oz-in-s2
Required Shaft Length
  With D-Cover option
  With H-Cover option
0.385" to 0.400"
>=0.385"
in.
in.
PartMaterial
Base, Cover 20% glass filled polycarbonate
Codewheel Aluminum
Base OptionBolt CircleScrews IncludedScrew Torque
D 0.75" #4-40, length .250" pan head phillips (qty: 2) 2-3 in.-lbs.
M 0.75" M2.5x.45mm, length 6mm pan head phillips (qty: 2) 2-3 in.-lbs.
T n/a none - .005" thick transfer adhesive with peel away backing mount. n/a

The included centering tool and spacer tool are used to center the base to the motor shaft and to set the codewheel gap.

ParameterMin.Max.Units
Vibration (5 Hz to 2kHz) - 20 G
Shaft Axial Play - ±.020 in.
Off-axis Mounting Tolerance - 0.010 in.
Acceleration - 250,000 rad/sec²
Maximum RPM
e.x. CPR = 512, max. rpm = 7031
e.x. CPR = 180, max. rpm = 20000		   minimum value of
(3600000/CPR)
and (60000)		 rpm
Relative Humidity - 90 %
Storage Temperature -40 100 C
Operating Temperature -20 100 C
  • Note: 60000 rpm is the maximum rpm due to mechanical considerations. The maximum rpm due to the module's 60kHz maximum count frequency is (3600000/CPR).
SpecificationsMin.Typ.Max.UnitsNotes
Supply Current - 21 27 mA
Supply Voltage 4.5 - 5.5 V
High Level Output 2.4 - - V loh = -2 mA
Low Level Output - - 0.4 V lol = 8 mA
Rise Time - 500 - ns Cl = 25 pF, Rl = 2.7 kΩ
Fall Time - 100 - ns
Frequency Response - - 60 kHz

For complete details see the AEDR page.

SpecificationsMin.Typ.Max.UnitsNotes
Supply Current - 22 30 mA
Supply Voltage 4.5 - 5.5 V
High Level Output 2.4 3.4 - V loh = -20 mA
Low Level Output - 0.2 0.4 V lol = 20 mA
Rise Time - 500 - ns
Fall Time - 100 - ns
Frequency Response - - 60 kHz

For complete details see the AEDR page.

ParameterTyp.Max.Units
Symmetry Error 16 75 deg.
Quadrature Error 12 60 deg.

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 for more details).

 

timing_diagram_0.gif

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.

4-pin Single-ended6-pin Differential
PinDescriptionPinDescription
1 +5VDC power 1 Ground
2 A channel 2 A channel
3 Ground 3 A- channel
4 B channel 4 +5VDC power
    5 B channel
    6 B- channel

Product Description

Restriction of Hazardous Substances

The E8P optical incremental kit encoder is designed for high volume, low cost, mid-resolution OEM motion control applications. The E8P is small enough for a NEMA Size 11 stepper motor.The E8P uses a single 5V supply and offers two TTL quadrature outputs. Single-ended or differential output options are available. 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. The E8P uses an innovative, patent pending, push-on codewheel that provides extremely secure and accurate, yet easy installation without setscrews.

The E8P provides mounting holes for two #4-40, length .250" screws or two M2.5x.45mm, length 6mm screws on a 0.75" diameter bolt circle. When mounting holes are not available, an  option with a transfer adhesive pre-applied to the base is available. A centering tool is provided to center the base to the motor shaft during installation. The codewheel pushes on by hand using a spacer tool to set the gap in one step. The cover snaps on to complete the assembly in seconds.

The single-ended output version has a 4-pin high retention polarized connector and is designed to drive cables up to six feet long. For longer cable lengths, the differential output version (6-pin connector) is recommended to maximize noise immunity. The internal 26C31 differential line driver can source and sink 20 mA at TTL levels. The recommended receiver is industry standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 110 Ω resistor in series with a .0047 μF capacitor placed across each differential pair. The capacitor simply conserves power. Otherwise power consumption would increase by approximately 20 mA per pair, or 40 mA for 2 pairs.

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

Purchasing

Configure and Purchase

1. CPR






2. Bore
3. Output


4. Cover


5. Base



6. Packaging



Product Part Number
Quantity Price
1 $37.35
10 $27.12
50 $22.01
100 $18.64
Over 100 Call for quote
Quantity
Unit Price

$37.35

Subtotal

$37.35

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

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