Rotary encoder survives noisy environments
A
Micronor product story
Edited by the Engineeringtalk editorial team
May 11, 2006
A high resolution fibre optic rotary encoder is designed for large drive and rotary shaft applications requiring EMI immunity, high resolution and easy mounting.
Micronor's new MR314 ZapFree high resolution fibre optic rotary encoder was designed for large drive and rotary shaft applications requiring EMI immunity, higher resolution (1024pulse/rev) and the mounting convenience of a traditional hollow shaft encoder package.
There are no integral electronics within the encoder housing and the all-optical design requires just a single optical fibre connection - the utmost in simplicity, reliability and ease of installation.
The MR314's totally passive design outperforms conventional optical and magnetic rotary encoders over a wide range of harsh and/or hazardous environments: wide extended operating range (-60 to +150C); outdistances copper cable; intrinsically safe and ATEX-compliant; immune to EMI/RFI and ground loops; unaffected by high magnetic fields; and radiation resistant.
Special versions can be easily engineered for thermal-vac environments.
The "passive" MR314 optically links to the "active" MR310 ZapFree remote encoder interface (REI) module via a single 62.5/125um multimode fibre link - up to 1000m away.
With its convenient DIN-rail mount, the MR310 module is colocated with the PLC or other system interface electronics where power supply connections and conventional electrical interface connections are easily made.
The module offers a wide range of standard interfaces: direct quadrature outputs (both open collector and line driver), separate multiplier/divider quadrature outputs, two fully programmable analogue outputs (4-20mA and +/-10V), and PC-friendly RS232/RS422/RS485 serial interface.
In addition to the MR312/MR314 native incremental encoder mode of operation, the MR310's firmware also allows the encoder to emulate a multiturn absolute encoder.
The internal 24bit counter can track up to 32,768 revolutions of the 1024pulse/rev MR314 or 23,201 revolutions of the 360pulse/rev MR312.
Either a software command or TTL signal input to the MR310 establishes a calibration or zero reference (reseting the counter to zero).
An external battery back-up is required to maintain operation during power interruptions.
A combination power supply/back-up battery trickle charger is available.
Capacity of the battery determines the amount of backup time.
Like the original MR312 shafted fibre optic encoder, all MR3XX series encoders use telecomms-proven WDM (wavelength division multiplexing) technology by assigning each internal optical path (A or B) to a wavelength so that all wavelengths/paths can be combined onto a single fibre (patent pending).
It was deliberate to avoid the use of multiple fibres as this tends to drive up the cost of the optical harness.
A single-fibre cable is inherently more cost effective and more reliable than any multi-wire or multi-fibre or hybrid cable assembly - and easier to handle and install as well.
It just doesn't get any simpler.
A ZapFree encoder engineering evaluation kit (MR314, MR312, fibre optic cable and user guide) is available for $3495.
Larger quantities of both MR314 and MR310 can be as low as $2500.
For custom applications, the MR310 firmware can be enhanced with additional functions and modes of operation to offload previous forms of remote processing for more efficient system operation.
Special size shaft bores can also be accommodated.
Typical delivery is stock to 4 weeks ARO for standard configurations.
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Contact Micronor
Tel +1 805 499 0114
Other Micronor stories
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Interface sends encoder signals a kilometre
Micronor's MR310 ZapFree remote encoder interface module allows the all-optical, totally passive MR312/MR314 ZapFree fibre optic rotary encoders to remotely operate up to 1km away. -
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Micronor's MR318 fibre-optic rotary encoder is designed specifically for use as feedback in motion control systems operating in extreme electromagnetic fields. -
Micronor presents fibre-optic rotary encoder
Micronor has launched the MR316 Zapfree fibre-optic rotary encoder, designed for heavy-duty motor drive applications requiring EMI immunity, Atex compliance and IP66 ingress protection. -
Micronor introduces the MR190 MPG
Micronor's MR190 Universal Manual Pulse Generator/Handwheel (MPG) offers A/A'/B/B' differential line driver and A/B pull-up quadrature outputs. -
Rugged encoders fit into tight spaces
High-resolution analogue-output encoders are ideal for high-reliability and high-precision industrial-automation and process-control applications.
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