Encoder lineari ottici assoluti FASTRACK™ con RESOLUTE™

RESOLUTE is a true absolute, fine pitch optical encoder system that has excellent dirt immunity, and an impressive specification that breaks new ground in position feedback. RESOLUTE is the world’s first absolute encoder capable of 1 nanometre resolution at up to 100 m/s for linear encoding applications.

FASTRACK’s modular format makes it compatible with RESOLUTE RTLA absolute scale or TONiC™ RTLC incremental scale, providing a truly flexible system for users serving a variety of customers or markets.

RTLA optical absolute linear encoder scale

FASTRACK with RTLA absolute linear scale combines high-accuracy, tape scale convenience and unrivalled ruggedness. Combined with RESOLUTE readheads, the result is surely the ultimate in tape scale encoder systems…

RESOLUTE reads a unique single-track RTLA optical scale and offers further attractive benefits to machine designers by acquiring absolute position immediately upon switch-on, without the need for battery back-up. This completely eliminates the need for reference returns. Unique combinations of ruggedness, ultra-high speed and exceptional resolution, mean that RESOLUTE is already attracting high levels of interest from manufacturers of high-speed linear motor systems as well as slower-moving axes requiring the highest levels of precision and motion control integrity.

 

Sophisticated new optics

RESOLUTE can serve this wide range of markets because it offers more than just raw speed and high resolution. The RESOLUTE absolute encoder uses sophisticated new optics to read the fine pitch 30 µm scale with impressive low noise levels (jitter <10 nm RMS) for outstanding positional stability, while the enhanced detection method intrinsically provides a very low sub-divisional error (SDE) of ±40 nm. The result is better scanning and velocity control, and rock-solid servo stiffness on linear motors or rotary direct-drives when holding position.

RESOLUTE does not follow the conventional technique of using dual tracks side-by-side (one incremental, one absolute) which inherently suffer de-phasing problems when small amounts of angular misalignment are introduced. Instead, this new absolute encoder features a single track, optical absolute scale, combining both the absolute position and embedded phase information into one single code. This technology provides RESOLUTE with far wider set-up tolerances for quick and easy installation and superior long-term reliability, even if the motion axes settle or move over time. To further aid installation and diagnostics, there is an integral set-up LED on the readhead.

Please note that only RTLA scales feature a line that indicates orientation of the scale; holding the scale horizontally in front of you, when the orientation line is above the coded graduations, the lowest position value is on the left-hand end of the scale. The orientation line is not seen by the readhead and is not a second track, click on image to see orientation line. Therefore the readhead/scale system maintains the benefits of being a single-track system.

Excellent dirt immunity

The precision optics give excellent immunity to dirt on the scale, which is further enhanced by extensive redundancy in the scale code. Safety is assured by a built-in separate and independent position checking algorithm. This actively checks every reading, ensuring any potential problem is flagged long before it reaches the controller.

The revolutionary readhead also incorporates a temperature sensor to measure heat build-up giving extra system protection, by signalling an alarm condition if head temperature rises above +80°C. This alarm is in addition to the signal monitoring, position-checking and speed monitoring that is carried out constantly inside the readhead.

 

Variety of protocols available

The RESOLUTE absolute encoder uses purely serial communication resulting in exceptional noise immunity. It is available with a variety of protocols to enable easy connection to a wide range of industry-standard controllers and potential customers are advised to check with Renishaw for the latest list.

 

 

 

Continue the tour... find out more about FASTRACK for TONiC optical incremental linear encoder

 

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