Product Overview

The SEK/SEL motor feedback system is a precision position sensor designed for accurate rotational position monitoring in industrial motor applications. It provides absolute position detection with a single ascertainable revolution, ensuring reliable positioning without the need for external reference points. The system delivers high accuracy through binary code encoding of absolute values and operates via HIPERFACE® communication for seamless integration into control systems. With a compact design and low power consumption, it is ideal for use in environments requiring precise motion feedback. The sensor is engineered to operate across extreme temperature ranges and supports robust mechanical stability with minimal shaft movement tolerance. Its standard product classification indicates it does not meet safety component requirements under the Machinery Directive, as defined by SICK. This makes it suitable for general-purpose positioning tasks where high reliability and cost-efficiency are prioritized.

Key Features and Technology

The SEK/SEL system uses a binary code to represent absolute position values, enabling precise detection of rotational movement with one ascertainable revolution. It achieves system accuracy of ±432 ″ under standard conditions, with error limits for sine/cosine period evaluation at ±288 ″. The sensor communicates via HIPERFACE® interface using an 8-pin male radial connector, ensuring fast and reliable data transfer. Its low current consumption—less than 50 mA—supports energy-efficient operation. The system is designed to operate in electrically conductive housings when connected to the motor controller’s central earthing point through a cable screen for electromagnetic compatibility (EMC) compliance as per EN 60068-2-6. Users must verify EMC performance if alternative shielding methods are employed, as SICK does not guarantee compliance under non-standard configurations.

Technical Characteristics

The SEK/SEL motor feedback system operates within a supply voltage range of 7 V DC to 12 V DC, with a recommended voltage of 8 V DC for optimal performance. It consumes less than 50 mA under nominal conditions and has a unit weight of 35 grams (net), with a total unit weight of 35.000 grams. The permissible radial shaft movement is ±0.15 mm, while axial movement tolerance is ±0.3 mm. The operating temperature range spans from –40 °C to +115 °C, and storage conditions extend to –50 °C to +125 °C without packaging. The system is rated for vibration resistance up to 50 g at frequencies between 10 Hz and 2,000 Hz (EN 60068-2-6). Enclosure rating is IP20 when the mating plug is inserted and cover closed. All values are based on nominal load, average ambient temperature of 60°C, and usage frequency of 8760 hours per year.

Configuration and Integration

The SEK/SEL system integrates via a male 8-pin radial connector using the HIPERFACE® communication protocol. It is designed for direct mounting on motor shafts with permissible axial and radial movements of ±0.3 mm and ±0.15 mm, respectively. For proper electromagnetic compatibility (EMC), the sensor must be installed in an electrically conductive housing connected to the central earthing point of the motor controller via a cable screen. This configuration ensures compliance with EN 60068-2-6 vibration standards. If alternative shielding methods are used, users are responsible for verifying EMC performance independently. The system is not classified as a safety component under the Machinery Directive; all electronic failures are considered hazardous. Integration requires adherence to standard operating conditions and recommended voltage levels to ensure consistent performance.

Operating Environment

The SEK/SEL motor feedback system is designed for operation in harsh industrial environments with an ambient temperature range of –40 °C to +115 °C. It can be stored at temperatures from –50 °C to +125 °C without packaging, making it suitable for extreme climate conditions. The sensor demonstrates resilience against mechanical vibrations up to 50 g across a frequency range of 10 Hz to 2,000 Hz as defined in EN 60068-2-6. It operates reliably under standard usage frequencies of 8760 hours per year. The IP20 enclosure rating ensures protection against solid foreign objects and limited dust ingress when the cover is closed and plug is inserted. These characteristics support reliable performance in demanding industrial settings such as manufacturing lines, robotics, and automated assembly systems.

Industrial Applications

The SEK/SEL motor feedback system is ideal for applications requiring precise rotational position feedback in motion control systems. It is commonly used in servo drives, robotic joints, and precision positioning mechanisms where absolute position data is essential. Its high accuracy of ±432 ″ and binary absolute code structure support reliable operation without external reference points. The compact size, low power consumption, and wide temperature range make it suitable for integration into automated production lines, packaging machines, and material handling systems. Applications benefit from its robustness against vibration and thermal extremes. While not classified as a safety component under the Machinery Directive, its performance in non-critical positioning tasks ensures dependable operation within industrial automation environments.