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急停按钮开关到底使用常闭触点or常开触点?
作者: 时间:2020-09-12 16:10 阅读数:

  对于急停按钮开关,需要根据不同的安装尺寸进行选择,如LAY3-11TS急停开关,设备上急停按钮触点有使用常开触点(尤其在一些PLC输入上)的,也有使用常闭触点的。

  For emergency stop button switch, it needs to be selected according to different installation dimensions, such as lay3-11ts emergency stop switch. The emergency stop button contacts on the equipment have normally open contacts (especially on some PLC inputs) and also have normally closed contacts.

  急停按钮到底使用常闭触点,还是使用常开触点。

  Do emergency stop buttons use normally closed or normally open contacts.

  在设计中,在使用急停的场合还是要尽量使用常闭触点,主要从以下3个方面进行分析:

  In the design, the normally closed contact should be used as far as possible when emergency stop is used. It is mainly analyzed from the following three aspects:

  1、从动作时间上来说

  1. In terms of action time

  常闭触点由闭合到断开的时间要比常开触点由自然状态到闭合的时间短的多。

  The time from close to open is much shorter than that from natural state to close.

  也许你要说,哪能少多少呀?这么短的时间无所谓。

  Maybe you have to say, how much less? It doesn't matter in such a short time.

  这在发生危险需要急停时,尤为重要。这时,再短的时间,哪怕毫秒级甚至是微秒级的时间也是非常重要的。要知道,事故就是在很短的时间内发生的。

  This is particularly important when an emergency stop is required in case of danger. At this time, even the time of millisecond or microsecond is very important. You know, the accident happened in a very short time.

  在这么短的时间内,你使用常开触点可能没把机器停住或断开开关,造成了重大机器损坏或人身伤亡事故。

  In such a short period of time, you may not use the normally open contact to stop the machine or disconnect the switch, resulting in serious machine damage or personal injury.

  但使用常闭触点就有可能把机器停止或让人触电时间短一些,避免这一切的发生。

  However, it is possible to stop the machine or make people get electric shock for a short time by using normally closed contacts to avoid all this.

  2、从按钮机构上来说

  2. From the button mechanism

  急停按钮无论是常闭还是常开触点,在不按到位(按到底)的情况下,会重新弹起来,从而使动作使效。

  Whether the emergency stop button is normally closed or normally open, if it is not pressed in place (press to the end), it will bounce up again, thus making the action effective.

  使用常开触点时,在急停按钮未按到位时,急停是未起到任何作用的(因常开触点未闭合);而使用常闭触点时就不一样了,无论急停按钮按没按到位,只经触点动作了,急停就起作用了。

  When using the normally open contact, when the emergency stop button is not pressed in place, the emergency stop does not play any role (because the normally open contact is not closed); when the normally closed contact is used, the emergency stop will work no matter whether the emergency stop button is not pressed in place, and only after the contact acts.

  3、从其控制线路上来说

  3. In terms of its control circuit

  急停按钮最基本的作用就是在紧急情况下的紧急停车,避免机械事故或人身事故。

  The most basic function of the emergency stop button is to stop the emergency in an emergency to avoid mechanical accidents or personal accidents.

  但是,由于机器的长时间运行,线路尤其是急停线路部分,有可能造成故障断路。这时,如果急停按钮使用常开触点,急停部分的线路故障就会发现不了,如果到时用急停按钮的时候再发现就已经晚了。

  However, due to the long-time operation of the machine, the circuit, especially the emergency stop line, may cause fault and open circuit. At this time, if the emergency stop button uses the normally open contact, the line fault of the emergency stop part will not be found. If the emergency stop button is used at that time, it will be too late to discover again.

  而用常闭触点时,当急停部分的线路发生故障时,最多会造成机器的停车,损失会相对小些。

  When using the normally closed contact, when the circuit of the emergency stop part breaks down, the machine will stop at most, and the loss will be relatively small.

  正是基于以上几点原因,在设计电气控制系统时,急停按钮开关最好还采用常闭触点。

  It is based on the above reasons, in the design of electrical control system, emergency stop button switch should also use normally closed contact.