RESOLUTE™ FS absolute encoder system with RELA30 linear scale
Features
- Serial interfaces: BiSS® Safety, Siemens DRIVE-CLiQ®
- Readhead size: 36 x 16.5 x 17.2 mm
- Resolutions to 1 nm at 100 m/s
- ±1 µm accuracy at 20 °C
- Scale coefficient of thermal expansion at 20 °C: 0.75 ±0.35 µm/m/°C
- Certified to:
ISO 13849 Category 3 PLd
IEC 61508 SIL2
IEC 61800-5-2 SIL2
Benefits
- Very high accuracy combined with near zero thermal expansion
- 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 the RESOLUTE FS encoder?
The RESOLUTE FS (Functional Safety) series 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 1 nm resolution at up to 100 m/s. Ultra low Sub-Divisional Error (SDE) and jitter result in a rotary encoder system that outperforms any other encoder in its class. Certified to SIL2 and PLd for use in Functional Safety applications.
What is RELA30 scale?
RELA30 is a spar scale manufactured from ZeroMet, a low expansion nickel/iron alloy, featuring our 30 µm pitch absolute scale code.
It is comparable to fine pitch glass scales and offers a total accuracy (including slope and linearity) better than ±1 µm up to 1 m length. ZeroMet has a thermal expansion coefficient of 0.75 ±0.35 µm/m/°C at 20 °C.
System designers can choose between specially formulated adhesive tape or mechanical clips to suit mounting requirements. Both mounting methods allow for independent thermal expansion to that of the substrate.
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.
Functional Safety certification
The RESOLUTE FS series is a true-absolute open optical encoder system with certification to the following Functional Safety standards:
ISO 13849 Category 3 PLd
IEC 61508 SIL2
IEC 61800-5-2 SIL2
Certain machinery safety functions, such as Safety Limited Speed (SLS), require the encoder feedback to be functionally safe. Utilising an encoder system that is already rated for use in these applications can make machine certification significantly easier. Adopting these advanced machine safety functions allows machine builders to make safer machines, capable of higher functionality that can reduce set-up times and machine downtime.
Wide set-up tolerances
RESOLUTE FS 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 FS 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
| Serial interfaces | Description |
| BiSS Safety | Renishaw supports BiSS Safety (unidirectional) open protocol for absolute encoders. BiSS Safety is a high-speed serial interface, perfect for dynamic axes that require high acceleration, smooth velocity control, excellent bi-directional repeatability and rock-solid positional stability. RESOLUTE FS with BiSS Safety is available in both linear and rotary (angle) encoder versions. |
Siemens DRIVE-CLiQ | RESOLUTE FS 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. |
Refer to data sheet for full details.
Technical specifications
Measuring standard | Absolute coded high accuracy ZeroMet spar scale |
Readhead size (LxWxH) | 36 mm x 16.5 mm x 17.2 mm |
Scale pitch | Nominal 30 μm |
Thermal expansion coefficient at 20 °C | 0.75 ±0.35 μm/m/°C |
Accuracy grade at 20 °C | Certified to ±1 μm, calibrated traceable to International Standards |
Scale length | (See data sheet for details) 80 mm to 1.5 m |
Maximum speed | (See data sheet for details) 100 m/s |
Serial interfaces* | BiSS Safety, Siemens DRIVE-CLiQ† |
Resolutions | 50 nm and 1 nm resolutions |
Sub-Divisional Error (SDE) | ±40 nm |
Electrical connection | BiSS Safety: up to 10 m cable lengths, 9-way D and M12 connector Siemens DRIVE-CLiQ interface: up to 10 m cable lengths and M12 connector |
Power supply | 5 V ±10%, max 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 |
Refer to data sheet for full details.
†For BiSS Safety and Siemens DRIVE-CLiQ specifications, refer to data sheets.