RESOLUTE™ UHV absolute encoder system with REXA30 rotary (angle) ring
Features
- Serial interfaces: BiSS® C, Panasonic
- Readhead size: 36 x 16.5 x 17.2 mm
- Resolutions to 32 bits/rev
- Speed up to 8 500 rpm
- Installed accuracy to ±1 arc second
Benefits
- Thick cross-section ring
- Wide set-up tolerances
- Low outgassing for vacuum environments
- 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 UHV?
RESOLUTE UHV brings absolute encoder technology to Ultra-High Vacuum applications, allowing customers to achieve higher throughput, reduce risks of damage and increase dependability.
RESOLUTE outperforms all other absolute encoders that are designed for UHV environments. Capable of 32-bit resolution at 8 500 rpm, RESOLUTE provides a specification that breaks new ground in encoder technology.
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.
UHV (Ultra-High Vacuum)
RESOLUTE UHV takes Renishaw's revolutionary absolute encoder technology and delivers it in a readhead that is suitable for use in Ultra-High Vacuum conditions up to 10 -9 Torr. The new range of RESOLUTE UHV encoders are constructed from clean residual gas analysis materials (RGA) making them suitable for high performance, semiconductor and scientific applications.
Wide set-up tolerances
RESOLUTE UHV 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 UHV 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.
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
| 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. | |
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. |
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, Panasonic |
Resolutions | BiSS C: 18-bit, 26-bit and 32-bit Panasonic: 23-bit and 32-bit |
Sub-Divisional Error (SDE) | ±40 nm |
Electrical connection | Up to 10 m cable lengths with flying lead |
Power supply | 5 V ±10%, 250 mA @ 5 V (terminated) |
Vibration (operating) | 100 m/s2 max @ 55 Hz to 2 000 Hz |
Shock (non-operating) | 1 000 m/s2, 6 ms, ½ sine |
Operating temperature | 0 °C to +75 °C |
Bake-out temperature(non-operating) | 120 °C |
Sealing | IP30 |
Cable construction | Silver-coated copper braided single screen. FEP core insulation, over tin-plated copper wire. |
Refer to data sheets for full details.
†Other serial interfaces are continually being added.