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低压电器 | 第99页 | 找知识-找PLC

低压电器

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  • 这种西门子按钮辅助触点的卡子型号

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  • 触屏程序

    前几天用wicc  flexible  编的程序存在桌面今天在打开时报了个警(项目无法打开,因为它正在使用中。在其他Wicc fl…

    2017年6月1日
  • 直流熔断器与交流熔断器的区别在哪里?

    是否有这两种熔断器?同样电流级别的熔断器哪个成本高?交流熔断器可以用于直流熔断器吗?反之是否也可以? 最佳答案 直流熔断器与交流熔断器都属于限流熔断器的范畴,外形结构十分相似,但开…

    低压电器 2017年6月1日
  • 关于电气柜内的柜内接线的问题

    有一个关于电气柜的柜内接线的问题向高手请教:我看到国外进口设备的电气柜,他们的柜内接线包括主回路和控制信号接线都没有线号,那他们在接线时是如何保证不出错误的呢? 问题补充:是德国进…

    2017年6月1日
  • 两个电工基础的问题请教

    1、对于容抗较大的电容器在通电瞬间是不是没有大电流?是不是因为其本身有较大的容抗,所以即使是刚上电瞬间,也不会产生较大的过电流?2、电感串联在电路中,主要是起储能作用吗?以上两个问…

    低压电器 2017年6月1日
  • 请教有关西门子马达保护开关

    如图所示西门子sirius马达保护开关20-25A,是不是超过25A就跳闸呢,我测量了负载的电流大约在27A,但开关没有跳闸,说明书说要超过额定电流13倍才跳闸,请用过这类开关的大…

    2017年6月1日
  • 急求自动洗车机超声波测距的问题!急急急!

    现在主流的7字型旋转自动洗车机都用超声波测量车身长度,但是我设计的测距(即旋转90度后碰头和车尾的距离)不稳定,不同车型距离相差蛮大的,不知道怎么解决这个问题,是不是要识别车型?我…

    低压电器 2017年6月1日
  • 跨接的两台交流接触器,一台熔接粘连,一台进线端放炮。请教!

    两台交流接触器(A和B)跨接(从A跨接到B),出线端分别经热保护继电器各自驱动一台潜水泵。故障现象:接触器B内部熔接,主回路出线端子排上亮相端子烧结;接触器A进线端跨接点放炮,三相…

    低压电器 2017年6月1日
  • 伺服电机本身的编码器与外接编码器的作用

    请问伺服电机本身的编码器与外接编码器的作用分别时什么,二者共同使用的作用? 最佳答案 伺服本身的作用是和伺服驱动器形成全闭环  实现对电机位置 以及速…

    低压电器 2017年6月1日