Quando un filobus raggiunge un incrocio, uno scambio di linea, installato sui cavi aerei, controlla la la direzione di marcia. Interruttori possono essere nella condizione di default “Passa dritto” posizione o in posizione “Svolta”. Quando un filobus passa uno scambio di linea in posizione di svolta, un sensore montato sulle linee aeree rileva la presenza del collettore di corrente. Il sistema di controllo ripristina l’interruttore nella posizione predefinita.


Vantaggi per il cliente

  • Eccezionale affidabilità in un ambiente esterno gravoso
  • Funzionamento automatico con utilizzo ottimale dello spazio
  • Eliminazione degli errori di commutazione durante il funzionamento per tutto l'anno
  • Significativamente ridotti costi di manutenzione

Vantaggi specifici del prodotto

  • Dispositivo elettronico con Distanza utile fino a 12,000 millimetri
  • Ampia gamma di rilevamento disponibile in piccolo sensore
  • Eccezionale resistenza alle vibrazioni durante il funzionamento, IP67

Applicazione del 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.

Soluzione del 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.