RESOLUTE™ absolute encoder system with REXA30 rotary (angle) ring

Features

Serial interfaces: BiSS® C, FANUC, Mitsubishi, Panasonic, Siemens DRIVE-CLiQ®, Yaskawa
Readhead size: 36 x 16.5 x 17.2 mm
Resolutions to 32 bits/rev at 8 500 rpm
Installed accuracy to ±1 arc second
Vacuum compatible, Extended Temperature Range and side cable outlet versions available

Benefits

Thick cross-section ring
Excellent motion control performance
Exceptionally high dirt immunity
Wide set-up tolerances
Less than 10 nm RMS jitter for improved positional stability
±40 nm Sub-Divisional Error for smooth velocity control
Optional Advanced Diagnostic Tool

What is 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. It is the world's first absolute encoder capable of 32-bit resolution at 36 000 rpm. Ultra low Sub-Divisional Error (SDE) and jitter result in a rotary encoder system that outperforms any other encoder in its class.

What is REXA30 ring?

REXA30 is a one-piece stainless steel ring with 30 µm pitch absolute graduations marked directly on the periphery. Its larger cross-section allows for the reduction in all installation errors apart from eccentricity, which is easily corrected using the average result of two Resolute readheads. Featuring total installed accuracy up to ±1 arc second, zero coupling losses, and exceptional repeatability.
REXA30 is available in a range of sizes (Ø52 mm to Ø417 mm), all of which have a large internal diameter for flexible integration. The non-contact format eliminates backlash, shaft wind-up (torsion) and other mechanical hysteresis errors that are inherent in traditional enclosed encoders.

Why choose this encoder system?

Easy fault finding and servicing

The Advanced Diagnostic Tool ADTa‑100 acquires comprehensive real-time data from RESOLUTE™ encoder readheads (marked with the ADT symbol). The information is displayed via the user-friendly ADT View software interface. Whilst in most cases the integral set-up LED on the encoder is sufficient for setting up the system, the ADT can be used to aid more challenging installations. The ADT can also report on encoder performance and assist system fault finding to avoid lengthy machine downtime.

Excellent motion control performance

RESOLUTE's industry-leading performance is the result of a sophisticated, reliable and innovative method of operation. Crucially, the system uses a single track non-repeating “bar code” scale format with a nominal pitch of 30 µm. With its sophisticated optical design the RESOLUTE readhead captures a near-instantaneous image of this scale which, when analysed, allows a unique position to be identified at speeds of up to 100 m/s. The system allows position to be determined with resolution as small as 1 nanometre (1 billionth of a metre) and with low noise (jitter below 10 nm RMS) and SDE (Sub-Divisional Error, the error within a scale period) of just ±40 nm. This provides encoder feedback of superior fidelity, to ensure smoother velocity control and rock-solid positional stability.

Wide set-up tolerances

RESOLUTE does not follow the conventional technique of using dual tracks side-by-side (one incremental, one absolute) which inherently suffers de-phasing problems when small amounts of angular misalignment are introduced. Instead, this 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 (yaw tolerance ±0.5°) 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.

External interface option

Siemens DRIVE-CLiQ external interface

Required for Siemens DRIVE-CLiQ serial interface
Also available in dual head input for high accuracy rotary systems
Displays communication alarms
Duplicates readhead LED

No external interface is required for the other available serial interfaces.

Optional Advanced Diagnostic Tool ADTa-100

RESOLUTE encoder readheads (marked with the ADT symbol) are compatible with the Advanced Diagnostic Tool ADTa-100 and ADT View software. They provide comprehensive real-time encoder data feedback to aid more challenging installations and diagnostics. The intuitive software interface can be used for:

Remote calibration
Signal optimisation over the entire axis length
Digital readout of encoder position (relative to the scale)
Exporting and saving data
Setting zero

Serial interfaces	Description	Compatible products
BiSS C	Renishaw supports BiSS C (unidirectional) open protocol for absolute encoders. BiSS C is a high-speed serial interface, perfect for dynamic axes that require high acceleration, silky-smooth velocity control, excellent repeatability and rock-solid positional stability. RESOLUTE with BiSS C is available in both linear and rotary (angle) encoder versions, compatible with a wide range of industry-standard controllers, drives, DROs and PC counter cards.	BiSS C compatible product page
FANUC	RESOLUTE with FANUC (α and αi) serial interface is available for rotary and linear applications. RESOLUTE brings many advantages to high-performance machine tools that use FANUC controllers. Higher speed, rugged and reliable pure serial communications, superior contouring performance and greater servo stiffness. Furthermore, the non-contact format eliminates backlash, shaft wind-up (torsion) and other hysteresis errors that plague traditional enclosed encoders.	N/A
Mitsubishi	RESOLUTE with Mitsubishi serial interface is available in rotary and linear forms. RESOLUTE is compatible with the J4 and J5 series of servo drives, and the MDS-D2/DH2/DM2/DJ drives for machine tool applications.	N/A
Panasonic	RESOLUTE with Panasonic serial interface is available in linear and rotary forms. Compatible with the A5 and A6 series of drivers, it provides high resolution repeatable feedback for better servo and speed control.	N/A
Siemens DRIVE-CLiQ	RESOLUTE with Siemens DRIVE-CLiQ serial interface is available (using external interface) for linear and rotary applications. Siemens DRIVE-CLiQ is the innovative, powerful communications interface to connect encoder and direct measurement systems with SINUMERIK and SINAMICS drive components.	N/A
Yaskawa	RESOLUTE with Yaskawa serial interface is available in rotary and linear forms, and is compatible with Sigma-5 and Sigma-7 SERVOPACKs.	N/A

Refer to data sheet for full details.

Technical specifications

Measuring standard	One-piece ultra high accuracy absolute coded stainless steel ring
Readhead size (LxWxH)	36 mm x 16.5 mm x 17.2 mm
Scale pitch	Nominal 30 μm
Coefficient of thermal expansion at 20 °C	15.5 ±0.5 μm/m/°C
Ring outer diameter	52 mm to 417 mm
Total installed accuracy (with 2 readheads)	(≥100 mm diameter) ±1 arc second (75 mm diameter) ±1.5 arc seconds (≤57 mm diameter) ±2 arc seconds
Maximum speed	(See data sheet for details) 8 500 rpm (on 52 mm ring)
Serial interfaces†	BiSS C, FANUC, Mitsubishi, Panasonic, Siemens DRIVE-CLiQ**, Yaskawa
Resolutions	BiSS C: 18-bit, 26-bit and 32-bit FANUC: 23-bit and 27-bit Mitsubishi 2-wire: 23-bit Mitsubishi 4-wire: 23-bit and 27-bit Panasonic: 23-bit and 32-bit Siemens DRIVE-CLiQ**: 26-bit and 29-bit Yaskawa (rotary servomotors): 24-bit Yaskawa (fully closed loop control): 23-bit, 26-bit and 30-bit
Sub-Divisional Error (SDE)	±40 nm
Electrical connection	Up to 10 m cable lengths with D-type connectors (9 pin or 15 pin), flying lead, FANUC compatible connector, LEMO, and M12
Power supply	5 V ±10%, 250 mA @ 5 V (terminated)
Vibration (operating)	300 m/s²max @ 55 Hz to 2 000 Hz
Shock (non-operating)	1 000 m/s², 6 ms, ½ sine
Operating temperature	0 °C to +80 °C
Sealing	IP64