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Position sensors

Non-contacting sensors with CANopen

Novotechnik will be presenting a number of position sensors at the SPS IPC Drives 2014. All of these sensors are available with a CANopen interface.

NOVOTECHNIK (GERMANY) WILL SHOW single-channel, partially or completely redundant touchless linear position sensors and rotary position sensors at the SPS IPC Drives from November 25 to 27 in Nuremberg. Flat rotary position sensors, which are suitable for applications in machine and automotive engineering, will also be presented. 

The rotary position sensor RFC 4800 is available with a CANopen interface (Photo: Novotechnik)

Touchless rotary position sensors with CANopen

The rotary position sensor RFC 4800, which determines the measurement angle based on the positional change of a magnetic field, can be found in applications in machine engineering and plant design as well as in mobile applications. This sensor, which conforms to the protection requirements of IP69K, is even utilized in hydroelectric power plants. These sensors are also available with a CANopen interface, opening additional diagnostic avenues to the user, and providing additional features, such as cam switch, limit switch, speed data, etc. The CANopen version is available in single-channel or dual-channel designs, with one or two connectors. This allows for a stub connection or the loop-through of the bus. There are also different plating options available: The selection includes models with cable outlets, as well as 5-pin M12 connectors, and AMP or Deutsch connectors. In future, the CAN protocol J1939 for utility vehicles will be supported as well.

The physical separation of the completely potted, flat 15-mm sensor component and the magnetic position marker allows for sensor placement in up to 1,5 mm distance from the position marker. With the help of an available stronger position marker, even larger separation distances of up to approximately 4 mm are possible. A marking indicates the correct alignment with the sensor. Since neither shaft nor bearings are required, and because the sensing distance is variable, application-specific installation tolerances are not a problem. The non-contacting sensing of the measurement angle eliminates mechanical wear and tear, and yields absolute measurements over the entire 360° range. These measurements are provided with a 14 bit resolution (0,022°). In addition, a high-resolution speed signal is available for the control system. The (independent) linearity is ±0,5 %, with a repeatability of 0,1°.

The rotary position sensor RFC 4800 is available with a CANopen interface (Photo: Novotechnik)

Linear position sensor with CANopen for hydraulic cylinders

The TIM series linear position sensors for absolute measurements are magnetostrictive linear position sensors suitable for position sensing in the pressure ranges of hydraulic cylinders. These non-contacting sensors are also available with a CAN interface (i.e. J1939). In addition, node ID, bit-rate, transmission mode, transmission cycle time, gradient, and direction, as well as other parameters are configurable, and diagnostic and limit features are available. Possible applications include shaft and steering cylinders of agricultural or forestry vehicles and machinery as well as lifting jacks in the control systems of hydraulic cultivators.

The component series is offered in lengths of 50 mm to 2500 mm and can withstand many hydraulic fluids. The linearity is ±0,4 %, with a repeatability of 0,005 %, independent of the measuring distance. The sensors can withstand pressures of up to 350 bar, and thanks to an innovative plug-in connector system, they can be installed without soldering, crimping, or use of screws: The insulator of the M12 connector is already connected to the sensor’s lead wires and passed to the outside through a bore in the cylinder housing. The connecting flange just needs to be plugged in.

The rotary position sensor RFC 4800 is available with a CANopen interface (Photo: Novotechnik)

Rotary position sensor for tough applications

The non-contacting rotary position sensor RSX-7900 with CANopen interface comes with bus diagnostic features as well as cam switch and limit switch. The sensor function itself can be monitored: an example is the detection of real values directly at the steered shaft of electro-hydraulic steering systems. Potholes, road salt, and other untoward road factors do not interfere with the functioning of these sensors, so that the diagnostic capabilities of the CAN protocol can be utilized for these applications as well.

This sensor is available for measuring ranges up to 360°, and it allows for continuous mechanical rotation. It is available in single-channel or dual-channel designs. The completely redundant version can be utilized for applications where safety is a concern; it complies with the requirements of ISO 13849 PL-d. With a diameter of 79 mm and its height of 35 mm, this component can be integrated into the mechanics of construction, agricultural, and forestry machinery, as well as into the rudder steering systems of maritime vessels, and the like. Type E1 approval has been obtained from the German department of motor vehicles (KBA).

Magnetostrictive linear position sensor

The rotary position sensor RFC 4800 is available with a CANopen interface (Photo: Novotechnik)

Linear position sensors, namely the TP1 series (profile standard design), and the TH1 series (hydraulic cylinder standard design), are available with CANopen as well. All the advantages of the CANopen protocol, combined with the measurement capabilities of these systems, allow the plug-and-play use of these sensors.

Linear position sensors utilizing the Novostriktiv principle are available in measuring ranges of up to 4250 mm. They meet the protection requirements of IP67 or IP68. The permissible operating temperatures are -40 °C to +85 °C. The internal sensor resolution is independent of the measuring range and amounts to 1 µm.

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