Dynapar - Rotary Feedback products. Innovation, Customization, Delivery.

Innovation, Customization, Delivery

Dynapar encompasses the broadest line of trusted brands in motion feedback control, including Dynapar encoders and Hengstler brand incremental encoders and absolute rotary encoders, Northstar heavy-duty magneto-resistive and Heavy-Duty optical encoders and high-performance Harowe brand resolvers. Only Dynapar feedback solutions offer these world-class rotary feedback brands from one Global Supplier with 3 day delivery on most models for customer peace of mind.

Joliet Technologies is the preferred Dynapar Integrator for the Chicagoland area.

Acuro Series AI25 Absolute Encoder with BiSS InterfaceAcuro Series AI25 Absolute Encoder with BiSS Interface

Quick Specs…

  • Up to 17 Bit single-turn resolution
  • 4096 revolutions of multi-turn resolution
  • Short installation depth
  • Safety through self-diagnostics
  • Solid shaft and hollow shaft versions
  • -40° C to +100° C Operating temperature

Overview / Design Principle:

The ACURO AI25 absolute encoder is available in a single-turn or multi-turn version. Its multi-turn design is based on a reliable high-speed gear with optical scanning and the latest generation of OptoASIC technology.

Mechanical concept is based on a double ball bearing design, and is available as a solid-shaft or hollow-shaft version in common shaft diameters.

BiSS is a new, fully-digital and bi-directional sensor interface. It defines communication between one master and several slaves (sensors) in industrial control systems. BiSS manifests a new standard in technology and is available license-free. Due to its high performance, it constitutes an efficient alternative to the standard combination of data interface and analog sine/cosine incremental output.

BiSS needs only 6 wires and does not require any hardware for analog signals – and therefore, helps to reduce system costs.

Self-configuration allows “plug + play” and keeps the system in an operable condition even after a power failure. For detailed information on BiSS and support, please visit www.biss-ic.de.

BiSS Benefits:

  • All digital interface eliminates the costs of interpolation electronics
  • Offers transmission reliability through a 4-bit cyclic redundancy check (CRC)
  • Represents the only fully digital, open motor feedback interface for real-time applications

Features and Benefits:

  • Compact design to save valuable space
  • Low power consumption
  • Fast delivery of any model variant
  • Additional field-bus and point-to-point interfaces available

The Dynapar Advantage:

  • Innovative, high quality leading edge technology encoder products
  • Broad commercial – industrial grade product line
  • Customized built to order solutions available
  • Global Manufacturing & Service Support
  • Fast-Friendly Customer Service & Technical Support with Multi-Lingual Capabilities
  • Global Network of Authorized Resellers
  • Competitive Product Warranty: 2 Years


Dynapar brand ACURO Absolute Encoders offer a modern full-feature design equipped with BiSS interface.


Standard Operating Characteristics

Single-turn Resolution: 10, 12, 13, 14, 17 Bit
Multi-turn Resolution: 12 bit (only available with 12, 13, 14, or 17 bit ST resolution)
Linearity: +/- 1/2 LSB
Absolute Accuracy: ± 0.01° mechanical (36 arc-sec.)
Repeatability: ± 0.002° mechanical (7.2 arc-sec.)
Code format: Binary, Gray, Gray Excess, parameterization through AcuroSoft
Parameterization: Resolution code type, sense of rotation, warning, alarm


Connection: Cable, 23 – 12-pole Conin connector, M12 – 8-pole connector
Supply voltage: 5 VDC -5%/+10% or 10-30 VDC
Intrinsic current consumption: 50 mA (ST), 100 mA (MT) not including output current
Output current: 60 mA per bit, short circuit protected
Frequency response: 500 kHz
Maximum cable length: 400 m
Control Inputs: Direction
Alarm output: Warning and Alarm bits
Status LED: Green = OK, Red = Alarm (IP64 only)
Preset Switch: Sets encoder to zero output at present mechanical position (IP64 only)


Shaft diameter: Shaft: 6 mm (Servo Mount), 10 mm (Clamping Mount), 3/8″ (Square Flange Mount)
Hubshaft: 10 mm, 12 mm, 3/8″, 1/2″
Maximum shaft load: 6 mm shaft: 13 lb axial, 24 lb radial
10 mm shaft: 24 lb axial, 35 lb radial
Maximum shaft speed: 10,000 RPM (continuous), 12,000 RPM (peak)
Starting torque: < 1.4 in-oz
Weight (approx.): 350 g ST, 400 g MT
Shaft tolerance (hubshaft only): +/- 1.5 mm axial, +/- 0.2 mm radial
Flange configurations: Square, Clamp, Servo, Hubshaft with flexible tether
Bearing life: 1 x 1010 revolutions at 35% full rated shaft load
1 x 109 revolutions at 75% full rated shaft load
1 x 108 revolutions at 100% full rated shaft load


Operating Temperature: -40 to 100° C
Storage Temperature: -40 to 100° C
Enclosure Rating: IP64 or IP67
Shock: 1,000 m/s2 (6 ms)
Vibration: 100 m/s2 (10 to 2,000 Hz)

Available Specifications:

Related Products & Resources:

For additional information or to receive a full-line catalog, contact your Dynapar representative at 1.800.873.8731 or visit their web site at: www.dynapar.com
Headquarters:1675 Delany Road • Gurnee, IL 60031-1282 • USA
Phone: 1.847.662.2666
Fax: 1.847.662.6633
Email: custserv@dynapar.com or dynapar.techsupport@dynapar.com
© 2009 Dynapar Corp. Printed in U.S.A. • Feedback Quick Reference Guide P/N# N-FLB130 (11/09) 5M

Call Joliet Technologies TODAY 

If you have any questions concerning Dynapar products, feel free to contact us:
Phone (815) 725-9696,
Toll Free (866) 492-9888,
Fax (815) 725-9393 or
E-mail info@joliettech.com

Joliet Technologies custom packages, integrates and engineers AC Variable Frequency Drives (VFD), DC Variable Speed Drives (VSD) and AC Drive Controllers using top of the line manufacturers, like ABB, Emerson-Control Techniques, Siemens and Saftronics (Fincor). Our custom drive packages are built to your specifications for your application. We specialize in large horsepower drive systems (500Hp and above). Call us at (815) 725-9696 or fax us at (815) 725-9393 or e-mail us or fill out an RFQ with your requirements. Serving the greater Chicagoland area and the World.