Heidenhain recently introduced the new ECO 4410 absolute modular angle ring encoder to its ECA 4000 angle ring encoder series for use in safety-related applications. The new encoder is designed for use in machine tools and for automation applications, such as robotic arms.
The included EnDat data interface, as well as modifications made to the mechanical connection – which now includes fault exclusion – contribute to the ECA 4410’s functionality.
The encoder’s drum has a centering collar on the inside diameter, to center it via a fit on the mating shaft. These scale drums also have additional back-off threads for disassembly. If the machine manufacturer adheres to the dimensioning of the mechanical connections, this provides fault exclusion for the loosening of the mechanical connection, to achieve functional safety.
Additionally, the drum’s fault exclusion is ensured under all specified operating conditions, Heidenhain stated in a release.
The ECA 4410 can be used as a single-encoder system in applications with control category SIL 2 (as per EN 61508) and Category 3 PL performance level “d” (as per EN ISO 13849-1).
The ECA 4410 scanning heads were also modified for functional safety with changes to the holes for mounting. The threads for mounting the scanning unit from the back face were expanded and placed lower to permit the use of longer screws.
Mechanical fault exclusion is ensured, assuming compliance with the specified tightening torque and the minimum screw length.
The new ECA 4410 drums are mechanically compatible with the normal ECA 4000 line as well as the ERA 4000 line of angle encoder feedback devices.
For more information on this series and its relation to functional safety, a brochure is available at www.heidenhain.com.