Renishaw: SiGNUM DUAL READHEAD ROTARY ENCODER SYSTEM(DSi-QNS06)

DSi brings higher accuracy to rotary axes whilst propoZ ™ technology offers a selectable reference mark position. Using two readheads on an angle encoder improves the accuracy of the system by eliminating eccentricity, bearing wander and all odd error harmonics. DSi makes adding that second readhead easy by taking care of the combination of incremental channels and reference mark processing. DSi features patented propoZ technology that allows the customer to select reference output position with the press of a button.

The propoZ output position is angularly repeatable, regardless of bearing wander or power cycling. DSi is available in two versions, known as ‘local’ and ‘remote’. The local version is mounted directly onto the readhead interfaces, while the remote version can be mounted up to 30 metres away. Each version is available with either line-driven or 3-state alarms. Resolution is determined by the encoder interfaces that are connected to the DSi. DSi is available with several retiming frequencies to suit industry-standard controllers. Version now available for partial arc applications.
Renishaw’s SR readhead and Si interface are part of the SiGNUM range of optical encoders.

They have been designed for use with Renishaw’s range of high-accuracy RESM and REXM angle encoders and RSLM and RELM linear encoders which incorporate the IN-TRAC ™ bi-directional reference mark.

Like all Renishaw encoders, the SiGNUM range offers high-speed, reliable operation and open, non-contact performance with excellent immunity to dirt and electrical noise.

The interface incorporates dynamic signal control which, combined with the patented filtering optics, ensure excellent signal integrity and exceptionally low cyclic error.

The Si interface can be mounted remotely and a small connector on the readhead cable allows it to be fed easily through machines where access is restricted.

Interface unit (Si)

Si-NN-0004 – 5 µm

Si-NN-0020 – 1 µm

Si-NN-0040 – 0.5 µm

Si-NN-0100 – 0.2 µm

Si-NN-0200 – 0.1 µm

Si-NN-0400 – 50 nm

Si-NN-1000 – 20 nm

Si-HN-2000 – 10 nm

Si-HN-4000 – 5 nm

Si-NN-0000 – Analog

Si-NN-0001 – Low noise analog

System features

IN‑TRAC optical reference mark

• Integrated within the graduation for compact dimensions and simplified alignment

• Electronically phased, requiring no physical adjustment

• Sub-micron repeatability in both directions of travel over full operating temperature and speed range

• Mid-point (RELM and RSLM), end-point (RELE and RSLE), customer-selectable (RSLC) or distancecoded* (RSLD) location on linear scale system

Dynamic signal control

• Real-time signal conditioning for optimized performance across a range of operating conditions

• Includes Auto Gain Control (AGC), Auto Offset Control (AOC) and Auto Balance Control (ABC)

• Ultra-low cyclic error, typically

Calibration at the touch of a button

• Click of a mouse via SiGNUM software or CAL button on Si interface

• Optimization for all output signals

Integrated LED diagnostics

• Simplifies initial alignment and set-up

• Reference mark and limit status