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L2 Motor Encoder

L2 Web Product 01 Product Photo

L2 Features

  • Kit version for mounting on a motor or other shaft
  • Low profile, only 0.398 in. tall
  • Supports 14 shaft sizes (2 to 8 mm and 1/8 to 5/16 in.)
  • For NEMA 17 to NEMA 34 and larger motors
  • Resolutions from 32-1,250 CPR (128-5,000 PPR)
  • 2 channel quadrature TTL square wave output
  • Optional Index channel
  • High retention connector/cable (sold separately)

See more info below

Configure the L2

US Digital L2 Motor Encoder Description

Restriction of Hazardous Substances

The US Digital L2 motor encoder is a low-profile rotary encoder with a height of 0.398" that mounts directly to a motor or other rotating shaft. This optical encoder features a rugged, glass-filled polymer housing and is designed for easy installation into space-limited applications. The L2 has a standard 0.75 in. bolt spacing mount.

The L2 optical rotary encoder contains a precision machined aluminum hub with a specially patterned Mylar disk. This disk, in combination with our proprietary optical encoder module, creates a system that is highly tolerant to mechanical misalignment. 

The L2 incremental encoder has a single-ended output and is designed for use with a high-retention connector/cable, which are sold separately.

Product 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 ≤ 1250:
Max. RPM (1)
Max. A/B Frequency
e.x. CPR=1250, Max. RPM=14400
e.x. CPR=100, Max. RPM=60000
minimum value of ((18 x 10^6) / CPR) and (60000)
300
RPM
kHz
Typical Product Weight 0.53 oz.
Codewheel Moment of Inertia 8.0 x 10^-6 oz-in-s²
Hub Set Screw #4-48  
Hex Wrench Size 0.050 in.
Mounting Screw Size #2-56 or #4-40  
Required Shaft Length (2)(3) 0.445 to 0.575 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) Add 0.125" to the required shaft length when using R-option.

(3) Including Axial play.

TORQUE SPECIFICATIONS

PARAMETER VALUE TORQUE
Hub Set Screw 2-3  in-lbs
Base Mounting Screw (#4-40) 4-6 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 or EM2 product pages.
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
Supply Voltage 4.5  5.0 5.5 V  
Supply Current   27 33 mA CPR < 500, no load 
  54 62 mA CPR ≥ 500 and < 2000, no load
  72 85 mA CPR ≥ 2000, no load
Low-level Output     0.5 V IOL = 8mA max., CPR < 2000
    0.5 V IOL = 5mA max., CPR ≥ 2000
  0.25   V no load, CPR ≥ 2000
High-level Output 2.0     V IOH = -8mA max. and CPR < 2000
2.0     V IOH = -5mA max. and CPR ≥ 2000
  4.8   V no load and CPR < 2000
  3.5   V no load and CPR ≥ 2000
Output Current Per Channel -8   8 mA CPR < 2000
-5   5 mA CPR ≥ 2000
Output Rise Time   110   nS CPR < 2000
  50   nS CPR ≥ 2000, ± 5mA load
Output Fall Time   100   nS CPR < 2000
  50   nS CPR ≥ 2000, ± 5mA load

PIN-OUT

PIN DESCRIPTION
1 Ground
2 Index
3 A channel
4 +5VDC power
5 B channel

Note: 5-pin single-ended mating connector is CON-C5 or CON-LC5

ACCESSORIES

1. Centering Tool

Part #: CTOOL - (Shaft Diameter)
This reusable tool centers the shaft within the encoder base during assembly. It must be used for the proper functioning of the encoder.

2. Hex Tool

Part #: HEXD-050  
Hex driver, 0.050" flat-to-flat for #3-48 or #4-48 set screws. Included with -B or -1 packaging options for order quantities of 10 or more.

Part #: HEXW-050
Hex wrench, 0.050" flat-to-flat for #3-48 or #4-48 set screws. Included with -B or -1 packaging options for order quantities of 9 or less. Included with -3 packaging option for all order quantities.

3. Spacer Tool

Part #: SPACER-L2
This reusable tool sets the correct spacing between the disk and sensor during assembly. It must be used for the proper functioning of the encoder.

4. Screws

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-440-188-PH
Description: Pan Head, Phillips 4-40 UNC x 3/16"
Use: Base Mounting
Quantity Required: 2
Screws are not 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-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

Single-ended Output Waveform

Additional Information

Product 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.

Datasheets

Assembly Instructions & Videos

Related Pages

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