SICK SRS50-HFA0-K21 (SRS/SRM50 Series) | Rotary Motor Feedback System with HIPERFACE® Interface

Overview

The SRS50-HFA0-K21 is a high-precision, single-turn rotary feedback encoder designed for seamless integration into servo systems using the HIPERFACE® interface. It delivers absolute position monitoring with exceptional accuracy and durability—ideal for modern motion-controlled industrial applications. sick.com

Key Features & Specifications

• Absolute Resolution:

  • 1,024 sine/cosine cycles per revolution

  • 32,768 total steps → translates to a measuring step of 0.3″ (arcseconds) for high-resolution interpolation sick.com

• Precision & Accuracy:

  • Integral non-linearity: ±45″

  • Differential non-linearity: ±7″

  • Overall system accuracy: ±52″ sick.com

• Speed & Motion Capabilities:

  • Max operational speed: 6,000 rpm (absolute position reliable)

  • Peak speed with rotor: up to 12,000 rpm

  • Angular acceleration up to 200,000 rad/s²

  • Low operating torque: 0.2 Ncm (startup torque: 0.4 Ncm) sick.com

• Robust Construction:

  • Tapered shaft with spring mounting plate coupling

  • Rotor moment of inertia: 10 g·cm²

  • Static axial/radial play: ±0.5 mm / ±0.75 mm

  • Dynamic movement: ±0.1 mm radial / ±0.2 mm axial

  • Vibration & shock rated: 20 g (10 Hz–2 kHz) and 100 g (10 ms) sick.com

• Environmental Tolerance:

  • Operating temperature span: –30 °C to +115 °C; Storage up to +125 °C

  • Relative humidity: up to 90% (no condensation)

  • IP40 rating with connector attached

  • EMC compliant per EN 61000-6-2 / -6-3 when properly grounded sick.com

• Interface & Power:

  • HIPERFACE® digital interface for analog process and parameter channels

  • Uses an 8-pin male radial connector

  • Supply: 7–12 V DC (recommend 8 V DC), current draw: 80 mA

  • Sine/cosine output frequency ≤200 kHz

• Reliability Metrics:

  • MTTFD (Mean Time To Dangerous Failure): approx. 235 years per EN ISO 13849

  • Rated for extremely high mechanical endurance: up to 3.6 × 10⁹ rotations sick.com

Advantages & Typical Applications

• High Precision Feedback — Delivers sub-arcminute accuracy for precise motion control in servo systems.

• Robust Design — Made to withstand harsh industrial environments, temperature extremes, and mechanical stress.

• Extended Lifespan — High MTTFD and mechanical durability make it ideal for demanding automation setups.

• Slick Connectivity — HIPERFACE® interface simplifies integration with modern drives and quick tuning.