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接近开关里面是一个磁敏电阻

网址:www.coron.com.cn  2019-07-06  作者:admin    阅读:

对于两线制的接近开关,相当于一个开关,并且能感应金属或非金属的接近,一般用的原理是霍尔效应,三线制相当于有两个输出端,一个常闭,一个常开,当有物体接近时,状态会发生变化,一般我们只用一端就可以了,两线制比三线制的压降要大得多,所以使用时要注意负载的最小电压是多少,两线制开关使用时必须经过负载(继电器线圈,PLC数字量模块等),不然会短路烧掉。
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.
接近开关里面是一个磁敏电阻,当它接近金属电阻阻值就变小导通,两线的回路中必须带它允许电流的负载后,才接到电源中去,绝对不允许不带负载接电源。
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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