Product category:
Measurement systems
News Release from: Renishaw | Subject: RESM ring encoder
Edited by the Manufacturingtalk Editorial
Team on 12 November 2007
Encoder interface has serial
communications
Latest encoders for use in gear-driven and direct-drive rotary axes feature FANUC serial communications direct from the encoder for higher performance and easier connectivity.
Renishaw's RESM ring encoder is non-contact format and of large through-hole design combined with high accuracy and a rugged IP64 sealed readhead The SiGNUM encoders are said by Renishaw to be perfect for machine tool rotary axes
This article was originally published on Manufacturingtalk on 7 Mar 2001 at 8.00am (UK)
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For use in gear-driven and direct-drive rotary axes, Si-FN provides FANUC serial communications direct from the encoder for higher performance and easier connectivity.
Si-FN interfaces are available with three resolution options, as follows.
1 - 'Normal' offers 20 bit resolution (0.0003 deg resolution) and speeds up to 4,500 rev/min.
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2 - 'High Type A' has 23 bit resolution (0.000043 deg resolution).
3 - 'High Type B' interfaces provide up to 26 bit resolution (0.0000054 deg resolution) for the highest precision while still achieving 600 rev/min.
As with the rest of the SiGNUM range, the intelligent Si-FN interface features advanced signal processing such as Automatic Gain Control, Balance Control and Offset Control, to output reliable signals of high fidelity.
The result, said Renishaw in a report to manufacturingtalk.com, is the best Sub-Divisional Error (SDE) in its class; the SDE of the 209mm diameter Si-FN system is only +/-0.06 arcsec or five times better than competing optical encoders and more than ten times better than magnetic and inductive encoders.
As well as providing finer resolutions, 'High Type A' and 'High Type B' Si-FN versions feature advanced filtering electronics for the purest signals to improve position stability and velocity ripple by a factor of 2.
Si-FN interfaces with FANUC serial communications can be used with standard SiGNUM readheads and standard RESM rings of 52mm, 104mm, 209mm or 417mm diameters.
This allows the machine or rotary axis builder to easily select Si-FN as a 'last minute' upgrade option.
All position processing occurs in the Si-FN interface so high resolution and high speed combinations are possible that would require unfeasibly high frequency signals if used with traditional digital quadrature.
Serial communications also provide exceptional reliability in noisy environments, especially when combined with SiGNUM's double-shielded UL-approved cable.
All Renishaw SiGNUM encoders can connect via USB to a PC, where comprehensive SiGNUM software enables optimum set-up and real-time system diagnostics, even when in full servo loop control.
Si-FN adds a fully-functional DRO (digital readout) for further diagnostics. Request a free brochure from Renishaw ...
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