US Digital

HD25 Industrial Rugged Metal Optical Encoder

Overview

  • NEMA size 25 package
  • Anodized milled aluminum housing with O-ring housing seal
  • LED and phased array wide-gap monolithic encoder technology
  • Tracks from 0 to 100,000 cycles/sec
  • 100 to 2500 cycles per revolution (CPR)
  • 400 to 10,000 pulses per revolution (PPR)
  • 2 channel quadrature squarewave outputs
  • Single-ended or differential outputs
  • Optional index (3rd channel)
  • ABEC 5 bearings

The HD25 is a rugged optical incremental shaft encoder designed for heavy-duty industrial applications. The housing, machined from a...

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Product Specifications

Size NEMA size 25
Housing and Cover Material Anodized aluminum
Weight 17 oz.
Shaft Material Stainless steel
Shaft Diameter 0.3748" +0.0000" -0.0003"
Shaft Optional Flat Size .08 in. long x .03 in. deep
Shaft Runout ≤.0003 T.I.R.
Shaft Torque With Shaft Seal 3.5 in-oz. typical
Shaft Torque Without Shaft Seal Less than 1/2 in-oz.
Max Axial Load 40 lbs.
Max Radial Load 35 lbs.
Bearings ABEC 5 440 stainless steel with light preload
Bearing Life @ 4 Pound Load 2.3 x 10^9 revolutions
Moment of Inertia 2.8 x 10^-4 oz-in-sec²
Max Acceleration 1 x 10^5 rev / sec²
Max RPM With Shaft Seal 6000 RPM
Max RPM Without Shaft Seal 6 x 10^6 / CPR (limited by electronics)

AB Output

ParameterMin.Max.UnitsNotes
Supply Voltage (HV Version) 9.5 32 Volts  
Supply Voltage (LV Version) - 5.5 Volts  
Supply Current - 110 mA No load
Output High Voltage 2.4 - Volts  
Output Low Voltage - 0.8 Volts  
Output Source Current - 30 mA  
Frequency Response - 100 kHz  

AB Output:

Output Code Incremental
Output Format 2 channels in quadrature
Index Width 1/4 cycle wide
Output IC ET7272
Protection Level Output short to ground
Illumination LED
Low Voltage Operating Temperature -40 C to 100 C
High Voltage Operating Temperature -40 C to 85 C
Storage Temperature -40 C to 100 C
Shock 60 G's for 11 mSec
Vibration (5 to 2kHz) 20 Hz to 2000 Hz @ 20G's
Humidity With Shaft Seal 100% condensing (NEMA IP65)
Humidity Without Shaft Seal 98% non-condensing
  • Specifications apply over entire operating temperature range.
  • Values are for the worst error over a full rotation.

For Resolutions 2000 & 2048 with Index Only

ParameterSymbolMin.Typ.Max.Units
Cycle Error - - 3.0 7.5 °e
Symmetry - 130 180 230 °e
Quadrature - 40 90 140 °e
Index Pulse Width Po 40 90 140 °e
Channel I Rise after Channel B or Channel A Fall t1 10 450 1500 ns
Channel I Fall after Channel A or Channel B Rise t2 10 250 1500 ns

For All Remaining Resolutions

ParameterSymbolMin.Typ.Max.Units
Cycle Error - - 3.0 5.5 °e
Symmetry - 150 180 210 °e
Quadrature - 60 90 120 °e
Index Pulse Width Po 60 90 120 °e
Channel I Rise after Channel B or Channel A Fall t1 -300 100 250 ns
Channel I Fall after Channel A or Channel B Rise t2 70 150 1000 ns

timing_diagram.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 180°e.
  • Quadrature (Z): The phase lag or lead between channels A and B in electrical degrees, nominally 90°e.
  • Index (CH I.): The index output goes high once per revolution, coincident with the low states of channels A and B, nominally 1/4 of one cycle (90°e).
  • 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.
PinQuad. (AB)Low Temp. (CA7)
A A channel White w/ Blue stripe
B B channel White w/ Brown stripe
C* Index White w/ Orange stripe
D +VDC Orange w/ White stripe
E NC Brown w/ White stripe
F Common Blue w/ White stripe
G Case ground Green w/ White stripe

* Only available when Index channel is specified.

The 7-pin Connector

7-pin.gif

PinQuad. (AB)Low Temp. (CA7)
A A+ channel Blue w/ White stripe
B B+ channel Brown w/ White stripe
C* Index+ Orange w/ White stripe
D +VDC Green w/ White stripe
E NC Gray w/ White stripe
F Common White w/ Gray stripe
G Case ground White w/ Green stripe
H A- channel White w/ Blue stripe
I B- channel White w/ Brown stripe
J* Index- White w/ Orange stripe

* Only available when Index channel is specified.

The 10-pin Connector

10-pin.gif

Product Description

The HD25 is a rugged optical incremental shaft encoder designed for heavy-duty industrial applications. The housing, machined from a solid billet aluminum block and finished with clear anodizing, conforms to the industrial standard size 25 package. Size 25 encoders are widely used and are considered to be the backbone of feedback devices found in factory automation and industrial applications. The HD25 will drop directly into existing applications to provide a superior solution at a competitive cost. The HD25 is a factory stock product with little or no lead-time.

Typical applications include:

  • Automation, robotics, motion control, elevator controls, machine tools, food processing, X-Y tables and conveyors.
  • Lathes, grinders, CNC machine tools, high performance servos, test equipment, packaging machines, balance machines and cutting machines.
  • Web processing, rotary tables, transfer machines, stacker cranes, press controls, printing presses and pump controls.
  • Oil field equipment, saw mill machinery and construction machinery.

Our absolute encoders may be used in many stand alone applications that do not require a PC interface. For these applications we provide detailed communications protocols for all of our absolute products (see the SEI Absolute Encoder Communications Protocol page).

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. Flat


3. Seal


4. Voltage


5. Index


6. Output


Product Part Number
Quantity Price
1 $256.88
10 $212.94
50 $187.72
100 $169.52
Over 100 Call for quote
Quantity
Unit Price

$256.88

Subtotal

$256.88

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

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