August 2018
Wheel detection
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Wheel Detection
The main purpose of the Universal Train-Wheel Detector (UTD) is to reliably and safely detect the wheelbase point of any standard wheel size and profile (according to UIC 510-2) in all conditions of exploitation, with a very high degree of automatic discrimination of "false" cases. As such, it has application on modern safety signaling electronic devices, such as Electronic Stations (ES) and Electronic Level Crossings (ELX), but can equally be used on equivalent devices of older generations (eg. Relay devices Siemens Fü60 SpDrS64).
The design of the UTD device is such that it enables easy assembly / disassembly and connection, i.e. carrying out these operations without the use of a welding and / or drilling machine for the railway profiles. It also requires no digging / entranching of any UTD module. It is very easy to set up and connect to new infrastructure and detection points where there were no similar devices until now, but it is also easy to connect to the old cable infrastructure as a direct replacement to points where mechanical or electronic devices of similar purpose already exist (the minimum cable requirement is 2x0.9mm for copper ). Such UTD features make it easier to maintain these elements and systems on the rail network.

One of the most important characteristics of the UTD is the use in systems for track vacancy detection that satisfy the CENELEC SIL4 safety standard, enabling in this way to improve the quality and reliability of track section control and management of rail vehicles without significant infrastructure and financial interventions. With the addition of the UTD Axle Counter Module (AFI <here goes link to the AFI product on our site>) or SIL4 Axle Counter Device (BROS counter /), two or more UTD devices can be connected to perform axle counting function in one or more track sections, thus eliminating the need for the use of track circuits (long or short isolated sections). Two UTD devices can also be configured to detect the direction of movement of the vehicle, most often as a replacement for the function of the mechanical electro-hidraulic direction detector.
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Technical characteristics

UTD is a fully electronic device consisting of two components, a detector module (an external element, the so-called UTD-DM) and a signal module (internal element, the so-called UTD-SM).
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The UTD is designed to operate in all expected climatic conditions at temperatures ranging from -40 C to 80 C and relative humidity from 0% to 100% according to EN 60068-2-1, EN 60068-2-2, EN 60068- 2-30. The UTD is shockproof and vibration proof according to EN 50125-3 standard. The UTD device supports a maximum speed of up to 300 km / h for all standard wheel diameters over 300 mm and a maximum speed of 200 km / h for all standard wheel diameters below 300 mm.
From a safety point of view, the UTD can be used in the most demanding safety systems that satisfy the CENELEC SIL4 safety integrity level, but also in CENELEC SIL0 to SIL3 systems.
The UTD device performs a constant self-check of all critical parameters for the operation of the device. Irregular situations can arise due to failures and accidental or deliberate damage or attempts to sabotage the device itself and / or the cable network. Some of these situations can be:
  • Interruption or short circuit in the cable that connects UTD-SM and UTD-DM
  • UTD-DM failure including the situation of irregular disassembly (separation) of the module from the rail profile
  • Malfunction of UTD-SM
  • Unauthorized voltage drop / failure

If the UTD device detects an irregularity in any of these parameters, it automatically switches to safe mode.
The design of the UTD is such that it has an excellent resistance to external climatic, mechanical and electrical influences:
  • IP 68 according to EN 60529 standard
  • Vibration and shock resistant according to EN 50125-3 standard
  • Steel shielding that prevents the impact of objects that hang or fall off the rail vehicles
  • Protection against return traction line current influence
  • Compliance with all known rail devices and track circuits
  • Over-voltage and over-current protection according to EN 50124-2 standard