MR304 and MR320 Series
Fiber Optic Incremental Encoders
Fiber optic incremental encoders are typically used to sense the motion and speed of a motor shaft or linear actuator where conventional electronics-based encoders and resolvers are inadequate. Typically the user’s control system is looking for A/B quadrature signals for which electro-magnetic interference and noise causes system errors.
Micronor fiber optic incremental encoders are based on an all-optical passive Sensor design which optically connects to a remote Controller via a standard duplex OM1 62.5/125 multimode fiber optic link spanning distances up to 2500 meters. The Controllers offer much more interface capability then just A/B quadrature outputs. The additional built-in analog (4-20mA, ±10V) and digital interfaces (RS485, USB, Modbus RTU) and can also be user-programmed to output speed or position status.
- MR304 Rotary series offers small form factor Size 11 encoders as well as integrated gear motor/encoder units based on Maxon A-max 26 series
- MR320 Rotary series offers medium (58mm) to large (125mm) size rotary encoders up to 1024ppr resolution. Mounting styles include solid shaft and hollow shaft
- Special non-metallic, MRI safe models are also available
- Original MR310 series is available by special order: MR310, MR312, MR314, MR316, MR318
Micronor fiber optic encoders provide interference free feedback in challenging environments and applications as diverse as medical devices to welding robots, and steel mills to mines. The diagram below illustrates a typical application where the fiber optic encoder is used to provide noise-free, closed loop feedback for precise control of a VFD or High Voltage Drive system:
MR322 series Incremental Encoder offers 100-360ppr resolution in an industry standard Size 58mm encoder housing. The sensor is ideal for motor speed control and low resolution position monitoring. Like all of Micronor’s fiber optic encoders, the MR322 is a passive sensor which is immune to EMI and is ATEX classified as a “simple apparatus” for use in all manner of hazardous locations and explosive environments. Standard temperate range is -40° to +80°C while the Extended Temperature option can operate over -60°C to +150°C
MR325 Series High Resolution (1024ppr) Incremental Encoder is ideal for closed-loop feedback of variable frequency drives (VFD) and other high horsepower motor drives operating in challenging environments. The MR325 is a totally passive sensor, immune to EMI and can transmit interference-free over distances up to 2500 meters.
The MR304 Encoder is a 100% passive sensor which operates entirely in the optical domain. The sensor provides immunity to any electro-magnetic interferences such as lightning, radiation, magnetic fields and other harsh environment conditions. The innovative design provides 100% electrical isolation as well as immunity to high voltages – ideal for harsh environment applications such as feedback for welding robots, measuring anode position in smelters, and monitoring pantograph operation in electric rail applications.
User friendlier Duplex LC (push-pull) interface
Optical loss budget increased to 12.5dB
Encoder links up to 2.5 km
MR324 High Resolution (1024ppr) Hollow Shaft Incremental Encoder is ideal for closed-loop feedback of variable frequency drives (VFD) and other high capacity/high voltage motor drives operating in challenging environments. The MR324 is a totally passive sensor, immune to EMI and can transmit interference-free over distances up to 2500 meters. An Extended Temperature option offers -60°C to +150°C operation.
IP66 ingress rating (resistant to powerful water jets)
Resolution options are 100, 128, 256 and 360 ppr
Optical link to MR320 Controller can extend up to 2500 meters
Temperature range options include Standard (-40°C/+80°C) and Extended (-60°C/+150°C)
Intrinsically safe – ATEX classified Simple Apparatus for use in mines and other EX rated hazardous locations
The MR30X series fiber optic position sensor system is an innovative all-optical design immune to any electro-magnetic interferences such as magnetic fields, lightning, voltage, and other harsh environment conditions. The MR302-1 Controller works with any of the MR30X series fiber optic incremental encoders – rotary or linear. The Sensor is connected to the Controller via an industry-standard 62.5/125μm duplex multimode fiber optic link. The controller keeps track of position and also calculates the RPM or linear speed of the connected encoder. Both position and speed can be read via Modbus/RS485 serial interface, USB or analog output. The analog output can be configured for either ± 10V or 4-20mA output.