Cuando un trolebús alcanza un cruce de carreteras, los interruptores, instalados en los cables conductores aéreos, controlan su dirección de desplazamiento. Los interruptores pueden estar en la posición “recto” o en la posición de “turno” de forma predeterminada. Cuando el trolebus pasa por un interruptor en la posición de “turno”, un sensor montado en los cables aéreos detecta la presencia del colector de corriente. El sistema de control entonces se restablece y interruptor pasa a la posición por defecto.


Valor al cliente

  • Fiabilidad excepcional en un ambiente aspero al aire libre
  • Funcionamiento automático con utilización óptima del espacio
  • Eliminación de errores de conmutación durante el funcionamiento durante todo el año
  • Reducción significativa de los costes de mantenimiento

Ventajas específicas de los productos

  • Todo dispositivo electrónico con Alcance hasta 12.000 mm
  • Amplio rango de detección, disponibles físicamente en un pequeño sensor
  • Excepcional resistencia a la vibración durante la operación, IP67

Aplicación cliente

In many countries, public-transit operators run fleets of trolley buses in major towns and cities. At road junctions, wire-switches, installed on the overhead conductor cables, control the direction of travel. Switches default to the straight-through position. When a bus approaches a turn, the driver uses a remote trigger to change the switch to the turnout position; after the bus completes the turn, the switch reverts to the straight-through position. If a triggered switch reverts to the straight-through position prematurely, the current collector may become disengaged, damaging the switch. Operators install safety systems to prevent premature switching. Typically, these utilize timer circuits that introduce a predetermined delay or mechanical sensors that rely on physical contact with the current collector. Neither system is sufficiently reliable. A Swiss manufacturer of trolley-bus control systems requires a highly reliable, rugged sensor system that will detect the presence of a current collector as it passes a switch. The system must operate with minimal maintenance and withstand the varied weather conditions of an outdoor environment.

Solución al cliente

Highly stable, all-electronic through-beam sensors from the Contrinex photoelectric range provide a reliable and cost-effective alternative. A purpose-designed metal bracket, mounted above the conductor cable, holds the transmitter and receiver units in alignment on either side of the cable. As the current collector passes between the two units it breaks the beam, triggering the sensor and returning the switch to the straight-through position. The molded-resin sensor casings, fitted with glass sensing faces, are rated to IP67, making them virtually impervious to the harsh, outdoor environment. Physically small housings (30x30x15mm) eliminate the risk of accidental damage arising from a mechanical collision. Additionally, the bracket, complete with sensor, occupies a minimal amount of space in the crowded overhead area. Rugged construction and vacuum-encapsulated electronics minimize the effects of vibration. Each unit is connected to the trolley-bus control systems via a PVC-sheathed cable with a hermetically sealed entry. The receiver has an industry-standard PNP dark-on interface. The one-piece mounting bracket allows easy removal and replacement of the complete assembly during routine maintenance. Operational results have been excellent. The new Contrinex sensors are highly reliable, eliminating switching errors and reducing maintenance costs significantly.