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    接近開關里面是一個磁敏電阻

    網址:www.www.b71-sandoy.com  2019-07-06  作者:admin    閱讀:

    對于兩線制的接近開關,相當于一個開關,并且能感應金屬或非金屬的接近,一般用的原理是霍爾效應,三線制相當于有兩個輸出端,一個常閉,一個常開,當有物體接近時,狀態會發生變化,一般我們只用一端就可以了,兩線制比三線制的壓降要大得多,所以使用時要注意負載的最小電壓是多少,兩線制開關使用時必須經過負載(繼電器線圈,PLC數字量模塊等),不然會短路燒掉。
    For a two-wire proximity switch, it is equivalent to a switch and can sense the proximity of metal or non-metal. The general principle is Hall effect. A three-wire proximity switch has two output terminals, one is normally closed and the other is normally open. When an object approaches, the state will change. Generally, we only use one end, and two. The voltage drop of the wire system is much larger than that of the three-wire system, so when using the two-wire switch, we should pay attention to the minimum voltage of the load. When using the two-wire switch, we must pass through the load (relay coil, PLC digital module, etc.), or it will be burned out by short circuit.
    接近開關里面是一個磁敏電阻,當它接近金屬電阻阻值就變小導通,兩線的回路中必須帶它允許電流的負載后,才接到電源中去,絕對不允許不帶負載接電源。
    Inside the proximity switch is a magnetoresistor. When it approaches the value of metal resistance, it becomes smaller and turns on. The two-wire circuit must carry its allowable current load before it is connected to the power supply. It is absolutely not allowed to connect to the power supply without load.

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