1398-PDM-030

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描述

1398-PDM-030

正迁移故障

在对处于正迁移状态差压变送器使用过程中的测量准确度进行判断时，将会遇到以下两种问题：一是仪表输出错误，如果安装正常的操作顺序，应该先对差压变送器三阀组的正负压测量时进行关闭，然后进行平衡阀打开和放空仪表堵头操作，4mA极限值应该远远高于仪表输出值，倘若仪表输出值大于极限值，那么则说明运行装置存在堵塞现象，最有可能发生故障的位置有三阀组和正压室引线；二是迁移量或者是零位显示不正常，如果将正压室取压点和放空开关依次进行关闭、打开操作后，仪表输出正常的情况下应该显示4mA，那么在迁移量或者是零位都较小时，仪表输出值将会明显低于4mA，反之，倘若仪表输出值大于4mA，此时零位或者是迁移量也会随之升高，此外，隔离液外漏或者是未装满会导致正负压室有隔离液渗入现象的发生。
负偏移故障
在对处于正迁移状态差压变送器使用过程中的测量准确度进行判断时，一般会进行两部分操作：先是应该先对差压变送器三阀组的正负压测量时进行关闭，然后进行平衡阀打开和放空仪表堵头操作，此时20mA应该为仪表输出值；之后将正压室取压点和放空开关依次进行关闭、打开操作后，4mA应该是仪表输出值，两次操作过后，仪表输出值均与实际不符的话，那么问题可能出现在以下几个方面：①隔离液渗漏；②正负压室引线不流通；③零液位的准确控制是生产装置稳定运行的前提保证，只有掌握了差压变送器测液面迁移的原理，才能在实际应用中灵活运用，及时准确的处理现场仪表出现的故障，以及对控制方案进行改进。

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选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
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。

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