Heidenhain ECN 113 Absolute Rotary Encoder
The Heidenhain ECN 113 (designated 204803S17-58) is a high‑precision absolute rotary encoder designed for demanding industrial feedback applications. This encoder features optical scanning of a graduated disk, delivering absolute position values without the need for a reference run after power‑up. It is widely used in servo motor feedback, CNC axis positioning, and robotics, where accuracy and reliability are essential.
The ECN 113 series is known for its robust construction, with a sealed housing that resists dust, oil, and moisture (IP67 rating). The encoder provides a serial communication interface (EnDat 2.2 or SSI), enabling high‑speed data transfer of position, temperature, and diagnostic information to the controller. Its compact design and standard mounting flanges facilitate easy integration into existing machine designs.
Technical Specifications
Resolution: Up to 13 bits (8192 positions per revolution) – absolute, with additional incremental signals for interpolation
Measuring principle: Optical scanning with integrated LED and photodetector array
Output protocol: EnDat 2.2 (bidirectional, serial) or SSI (synchronous serial interface)
Supply voltage: 5 V DC ±10%
Current consumption: ≤ 150 mA (typical)
Maximum shaft speed: 12,000 rpm
System accuracy: ±20 arcsec (depending on disk grade)
Operating temperature: -40°C to +100°C
Protection class: IP67 (shaft end and housing)
Shaft type: Solid shaft with clamping ring or blind hollow shaft (depending on variant)
Electrical connection: M23 circular connector or cable outlet
Vibration resistance: 200 m/s² (IEC 60068-2-6)
Functional Capabilities
Absolute position detection: The encoder immediately outputs the current angular position after power‑up, eliminating homing routines and reducing machine setup time.
EnDat communication: The bidirectional interface transmits not only position data but also internal parameters (e.g., temperature, alarm flags) for predictive maintenance.
High noise immunity: Differential signal transmission and optical isolation ensure reliable operation in electrically noisy environments typical of inverter drives.
Extended diagnostic functions: The encoder can report internal status (e.g., light level degradation, bearing wear) to the control system.
Typical Applications
Servo motor feedback: Directly mounted on the motor shaft for precise speed and position control loops.
CNC machine tools: Position feedback on rotary tables, spindles, and tool changers.
Printing and packaging machinery: Registration control and web tension regulation.
Robotics: Joint angle measurement for articulated arms and gantry robots.
Installation and Mechanical Integration
Mount the encoder using the provided flange, ensuring concentricity with the drive shaft to avoid radial stress. Use a flexible coupling if necessary. Tighten the clamping ring or hollow‑shaft locking mechanism to the specified torque. Connect the electrical cable according to the pin assignment, using shielded cables for the signal lines. The shield must be grounded at the controller side. After installation, perform a functional test to verify that the position readout is stable and matches the mechanical reference point.
Environmental and Compliance
The ECN 113 complies with CE, RoHS, and UL standards. It is rated for operation in pollution degree 2 and withstands humidity up to 95% (non‑condensing). The encoder is designed for long‑term reliability, with an MTBF exceeding 100,000 hours under normal conditions.
Conclusion
The Heidenhain ECN 113 absolute rotary encoder offers a combination of high resolution, ruggedness, and intelligent communication that makes it a preferred choice for advanced motion control systems. Its absolute measurement capability and diagnostic features contribute to improved machine productivity and reduced downtime.
