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VIONiC™ incremental encoder system with RTLC linear scale

Features

  • Digital output direct from the readhead
  • Readhead size: 35 x 13.5 x 10 mm
  • Resolutions to 20 nm
  • Speed to 12 m/s
  • Ultra-low Sub-Divisional Error (SDE): typically <±30 nm
  • Optical IN‑TRAC™ reference mark
  • Dual limits

Benefits

  • No separate interface required
  • Advanced Diagnostic Tool for easy fault finding, challenging installations and servicing
  • Ribbon scale convenience and unrivalled ruggedness
  • Carrier-type scale system for quick, easy installation and replacement of scale
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What is VIONiC?

VIONiC integrates Renishaw's filtering optics design and interpolation technology to create a high performance, super-compact, digital all-in-one incremental open optical encoder. It offers resolutions down to 20 nm and a wide range of configurations to optimise the speed for your motion control system. VIONiC systems are quick and simple to install with wide set-up tolerances and automatic calibration. VIONiC's dynamic signal processing gives improved signal stability with Sub-Divisional Error of typically <±30 nm to help realise superior motion control performance.

The Advanced Diagnostics Tool aids fault finding and servicing, and assists optimisation of system setup for challenging installations.

What is RTLC scale?

RTLC is a low profile stainless steel ribbon scale featuring 20 µm pitch incremental graduations and IN-TRAC customer selectable reference marks. It is accurate to ±5 µm/m and in lengths up to 10 metres. Two mounting options are available, both allow independent thermal expansion and ribbon scale convenience. 
RTLC can be used with the revolutionary FASTRACK™ scale carrier system. This system allows a track to be laid quickly and easily with no need for fixing holes. A sacrificial spacer is removed and the ribbon is then fed into the track.
RTLC-S is laid onto the substrate with self-adhesive backing tape. The self-adhesive is formulated in such a way that it allows for independent scale expansion to that of the substrate.
To complete the installation, both types of scale are clamped at one point to provide a datum position.

Why choose this encoder system?

All purpose digital encoder system

VIONiC is the encoder of choice because it combines high speed interpolation with impressive metrology performance making it suitable for even the most demanding applications. A wide range of encoder configurations are available so that the user can optimise the speed and resolution of their system depending on their motion control requirements. Furthermore VIONiC works with both linear and rotary scales accross a range of accuracies. VIONiC is quick and easy to calibrate, meaning it is suitable for volume production.

Easy fault finding and servicing

The Advanced Diagnostic Tool is available for comprehensive encoder feedback . This can be used for challenging installlations and fault finding. It provides:

  • Remote calibration functions
  • Signal optimisation over axis length
  • Readhead pitch indication
  • Limit and reference mark indicators
  • DRO and lissajous outputs.

Easily removable scale

RTLC/FASTRACK is ideal for applications that need the machine to be broken down for transportation or require the scale to be installed/removed for transit. The scale can be pulled out of the guide rails and quickly replaced, even when access is limited, thus reducing machine downtime.

Optional Advanced Diagnostic Tool

VIONiC Advanced Diagnostic Tool

The Advanced Diagnostic Tool (ADT) includes user software that allows control and monitoring of VIONiC's set-up and calibration routines. This set-up tool is ideal for factory production-line installation as it allows remote, advanced calibration features.

Find out more about the Advanced Diagnostic Tool

Technical specifications

Measuring standard

FASTRACK RTLC: stainless steel ribbon scale with track mounting system

RTLC-S: stainless steel ribbon scale with adhesive backing, for mounting directly to a substrate without FASTRACK guide rails

Readhead size (LxHxW)

35 mm x 13.5 mm x 10 mm

Scale pitch

20 μm

Thermal expansion coefficient at 20 °C

10.1 ±0.2 μm/m/°C

Accuracy grade at 20 °C

±5 μm/m

Reference mark

IN-TRAC reference marks directly embedded into RTLC / RTLC-S

Selector magnet(s) used to identify one or more reference marks

Limit switches

Dual limits

Scale length

FASTRACK: 100 mm to 25 000 mm

RTLC: 20 mm to 10 000 mm

RTLC-S: 20 mm to 5 000 mm

Maximum speed

Up to 12 m/s

(See data sheet for details)

Sub-Divisional Error (SDE)

Typically <±30 nm

Dynamic signal control

Real time signal conditioning including Auto Gain Control (AGC), Auto Balance Control (ABC) and Auto Offset Control (AOC) for optimised performance across a range of operating conditions

Incremental signals


5 μm to 20 nm resolution

(See data sheet for details)

Electrical connection

0.5 m, 1 m, 1.5 m, 2 m and 3 m cable lengths with D-type connectors (9 and 15 pin) or circular in-line connector (12 pin)

Power supply

5 V -5%/+10%, typically <200 mA fully terminated

Vibration (operating)

100 m/s2 max at 55 Hz to 2 000 Hz

Shock (non-operating)

500 m/s2, 11 ms, ½ sine, 3 axes

Operating temperature

0 °C to +70 °C

Sealing

IP40

Refer to data sheets for full details.

Downloads

Data Sheets

 

How it works

VIONiC features the third generation of Renishaw's unique filtering optics that average the contributions from many scale periods and effectively filter out non-periodic features such as dirt. The nominally square-wave scale pattern is also filtered to leave a pure sinusoidal fringe field at the detector. Here, a multiple finger structure is employed, fine enough to produce photocurrents in the form of four symmetrically phased signals. These are combined to remove DC components and produce sine and cosine signal outputs with high spectral purity and low offset while maintaining bandwidth to beyond 500 kHz.

Fully integrated advanced dynamic signal conditioning, Auto Gain , Auto Balance and Auto Offset Controls combine to ensure ultra-low Sub-Divisional Error (SDE) of typically <±30 nm.

This evolution of filtering optics, combined with carefully-selected electronics, provide incremental signals with wide bandwidth achieving a maximum speed of 12 m/s with the lowest positional jitter (noise) of any encoder in its class. Interpolation is within the readhead, with fine resolution versions being further augmented by additional noise-reducing electronics to achieve jitter of just 1.6 nm RMS.

TONiC™ optical scheme with annotations

The IN-TRAC reference mark is fully-integrated in the incremental scale and is detected by a split photodetector within the readhead. As the diagram shows, the reference mark split detector is embedded directly into the centre of the incremental channel linear photodiode array ensuring greater immunity from yaw-dephasing. This unique arrangement also benefits from an automatic calibration routine that electronically phases the reference mark and optimises the incremental signals.