Summary

トローリーバスが交差点に到着すると、ワイヤースイッチ、これはオーバヘッドコンダクターケーブルに取り付けられており、運行方向をコントロールします。スイッチはデフォルトの”ストレートスルー”ポジションの場合や”待避所”ポジションの場合があります。バスが待避所にあるスイッチを通過すると、頭上ケーブルに取り付けられたセンサが電流コレクターを検知します。コントロールシステムはそしてスイッチをデフォルトポジションにリセットします。

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ユーザー利点

  • 厳しい屋外環境でも非常に高信頼
  • 最適なスペース利用の自動操作
  • 1年間使用での検出エラー削除
  • メンテナンスコストの大幅削減

製品特徴

  • 検出距離12000mmまでのオール電子機器
  • 小さいセンサでも長い検出距離
  • 稼働中でも高い耐振動性、IP67

Customer Application

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.

Customer Solution

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.