6es7141-0bf00-0xb0

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6es7141-0bf00-0xb0

断路器作为最基本的电气保护开关元件,其用途非常广泛,社会保有量巨大,在现代生产和生活中已经成为最重要、最常用、最基本的保护电器,因此,保证断路器能可靠保护线路和负载的安全就显得尤为重要。

    长期以来一直没有一个确切的断路器负载电流的安全选择数据和计算公式,国家标准GB14048.2断路器是针对断路器的额定电流所制定的检验标准。什么条件下的负载电流在断路器的安全保护范围之内,对于专业技术人员来说是比较繁琐的计算问题,而对于非专业技术人员和操作者更是非常困难的问题。在国内外的相关技术文献中也很难找到相应的计算公式,也没有相关的经验数据可提供。因此,人们设计或选择、使用断路器时都是根据预期的最大负载电流来选择断路器的额定电流,或根据短路分断能力来选择断路器的额定电流,甚至有人为了避免的频繁跳闸现象,把断路器的额定电流选得很大,或者把可调脱扣器的整定电流调得很高,远远高出预期的最大负载电流。导致很多场合的断路器从设计到使用当中根本就不在安全保护线路和负载的范围之内,确切地说:该断路器根本就没有给线路和负载提供任何保护。线路和负载处于无保护状态下,当线路或负载出现过载、短路故障时,不可避免的将发生事故和火灾,甚至造成重大财产损失的人员伤亡。
    由于人们在选择断路器的额定电流或整定可调脱扣器的断路器的额定电流时,一直没有可量化的确切电流范围,没有可供准确计算断路器安全负载电流的计算公式,以至造成很多人认为只要安装了断路器就能保护线路和负载的安全了,甚至很多行业内的专业人员也有如此认识,造成实际额定负载电流不在断路器的安全保护范围之内,失去非常重要的保护功能,甚至造成重大的技术失误和后患。
    笔者通过总结多年实践工作经验和分析、实验,参照国家断路器标准GB14048.2及国际标准idtIEC60947-2:1997断路器之规定,,归纳整理出可供准确计算断路器安全负载电流的计算公式,通常只要按公式计算出最低保护极限负载电流,按此公式计算结果选择或整定断路器的额定电流,就可以起到安全保护线路和负载了。断路器的最高极限电流一般不超过断路器的额定电流都能满足要求。

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主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。