HD25A Absolute Industrial Rugged Metal Optical Encoder

1 / 3
  • HD25A
  • HD25A
  • HD25A

Overview

  • NEMA size 25 package
  • Anodized milled aluminum housing with O-ring housing seal
  • 3/8" diameter shaft
  • Up to 15 devices on a single 6-pin telephone-type cable
  • 12-bit accuracy
  • 7 milliseconds update time
  • EEPROM stores downloadable parameters
  • Field programmable resolution (2 to 4096 CPR)
  • Remotely updatable firmware

The HD25A is a size 25 absolute encoder designed for industrial applications. The HD25A optical encoder is a 120-bit absolute rotary position sensor, which reports a shaft angle within a single 360...

Read more

Product Specifications

ParameterValue
Operating Temperature -25C to 70C
Storage Temperature -40C to 100C
Humidity
  Non-sealed
  Sealed

98% non-condensing
100% condensing (NEMA IP65)
Vibration (5 to 2kHz) 20G
Shock, 11 mSec 60G

ParameterValue
Size NEMA size 25
Housing and Cover Material Anodized aluminum
Weight 16.91 oz.
Shaft Material Stainless steel
Shaft Diameter 0.3748 in.  (+0.0000 in. -0.0003 in.)
Shaft Optional Flat Size .80 in. long x .03 in. deep
Max. Acceleration 100000 rev / sec²
Max. Shaft Speed
  Non-sealed (mechanical)
  Sealed (mechanical)

15000 rpm
6000 rpm
Max. Shaft Torque
  Non-sealed
  Sealed

< 0.5 in-oz
3.5 in-oz typical
Max. Shaft Load
   Axial
   Radial

40 lb.
35 lb.
Max. Shaft Total Indicated Runout 0.0003 in.
Bearing Life in Millions of Revs. (124 / load in lbs.) ^3
Bearing Life @ 4 Pound Load 2.3 x 10^9 revolutions
Moment of Inertia 2.8 x 10 ^-4 oz-in-sec²
Technical Bulletin TB1001 - Shaft and Bore Tolerances Download
  • Specifications apply over entire operating temperature range.
  • Typical values are specified at Vcc = 12V and 25C.
ParameterMin.Typ.Max.Units
Supply Voltage 5.5 12 16 V
Supply Current
  Active
  Sleep


14

18.5
1.5

mA
Analog Output Impedance 950 1000 1050 Ohms
Zero Scale Analog Voltage 0 0.0005 0.003 V
Full Scale Analog Voltage 4.079 4.095 4.111 V
Output Noise (Analog version)   10   mVrms
Differential Nonlinearity -1.0   1.0 LSB
Absolute Accuracy (SEI interface version)   0.18 0.25 Degrees
Angle tracking speed
  Single-turn mode
  Multi-turn mode
   
3600
1800 
 
rpm
 Position Update Rate (1)      7 msec.

(1) The internal microcontroller takes a snapshot of the disk every 7 msec. and stores the position in memory. It responds immediately to a "report position request" by sending this value which is always the most current position.

 Parameter Default value
 Volatile?
 SEI address
 0  Non-volatile
 Resolution  3600  Non-volatile
 Origin offset
 0  Non-volatile
 Baud rate
 9600  Volatile
 Mode  0 (1)

(1) Mode is always restored from non-volatile EEPROM on power-up; however, there are separate SEI commands for setting the RAM copy only, or both the RAM copy and the non-volatile EEPROM copy.

network.gif

10-pin_0.gif

PinDescriptionColor
A DataH Blue w/ White stripe
B Busy+ Brown w/ White stripe
C Analog+ Orange w/ White stripe
D Power Green w/ White stripe
E NC Gray w/ White stripe
F Common White w/ Gray stripe
G Case Ground White w/ Green stripe
H DataL White w/ Blue stripe
I Busy- White w/ Brown stripe
J Analog- White w/ Orange stripe
Title Date Description Download
A2/HD25A Product Lines Detector Upgrade 8/18/2014 As part of our ongoing continuous improvement efforts, US Digital is updating our A2 and HD25A product lines design by utilizing surface mount devices for the detector and LED. Previously these were through hole devices. This change is transparent with the exception of minor cosmetic differences for the A2 kit style encoder, and Spacer Tool used in kit assembly process. Download

Product Description

Restriction of Hazardous Substances

The HD25A is a size 25 absolute encoder designed for industrial applications. The HD25A optical encoder is a 120-bit absolute rotary position sensor, which reports a shaft angle within a single 360 degree rotation of a shaft. Unlike incremental-, sometimes called relative-, style encoders, the HD25A provides true (absolute) shaft position, eliminating the need for a home or zero cycle after a supply voltage power cycle. The HD25A communicates over a RS 485-style serial bus utilizing US Digital's SEI (Serial Encoder Interface) which allows for simple, quick and convenient networking of multiple SEI devices on a single network. PLCs, motion controllers and computers can also reside on the SEI bus as well by use of US Digital's SEI to USB interface device. For complete information about the SEI bus please refer to the SEI Communications Protocol webpage.

The HD25A is also available with an optional analog output. The analog output option provides a maximum voltage range of 0 to 4.095 volts with 12-bit resolution. The output voltage may be easily scaled by simple SEI commands to provide other maximum voltage levels as well. From the factory, the analog output voltage is set to 0 to 3.599 VDC range. Please note that with the HD25A analog output option only one device may reside on a SEI bus.

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.

Cable/connector assembly not included and must be ordered separately.

Related Products & Accessories

Purchasing

Configure and Purchase

We recommend enabling Javascript when using the product configurator.

1. Flat


2. Seal



Product Part Number

This product requires configuration. Please supply the product options above.


Quantity Base Price
1 $414.75
10 $351.75
50 $318.00
Over 50 Call for Quote
Quantity
Unit Price

$414.75

Subtotal

$414.75


For volume discounts, please use the above part number and contact us at:

sales@usdigital.com or

800.736.0194 (Toll Free)
360.260.2468 (Local)
Call US Digital.