MVI56E-MNET

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描述

MVI56E-MNET

PID控制器的参数整定 
      PID控制器的参数整定是控制系统设计的核心内容。它是根据被控过程的特性确定PID控制器的比例系数、积分时间和微分时间的大小。PID控制器参数整定的方法很多，概括起来有两大类：一是理论计算整定法。它主要是依据系统的数学模型，经过理论计算确定控制器参数。这种方法所得到的计算数据未必可以直接用，还必须通过工程实际进行调整和修改。二是工程整定方法，它主要依赖工程经验，直接在控制系统的试验中进行，且方法简单、易于掌握，在工程实际中被广泛采用。PID控制器参数的工程整定方法，主要有临界比例法、反应曲线法和衰减法。三种方法各有其特点，其共同点都是通过试验，然后按照工程经验公式对控制器参数进行整定。但无论采用哪一种方法所得到的控制器参数，都需要在实际运行中进行最后调整与完善。现在一般采用的是临界比例法。利用该方法进行 PID控制器参数的整定步骤如下：(1)首先预选择一个足够短的采样周期让系统工作；(2)仅加入比例控制环节，直到系统对输入的阶跃响应出现临界振荡，记下这时的比例放大系数和临界振荡周期；(3)在一定的控制度下通过公式计算得到PID控制器的参数。
      在实际调试中，只能先大致设定一个经验值，然后根据调节效果修改。
      对于温度系统：P（%）20–60，I（分）3–10，D（分）0.5–3
      对于流量系统：P（%）40–100，I（分）0.1–1
      对于压力系统：P（%）30–70，I（分）0.4–3
      对于液位系统：P（%）20–80，I（分）1–5
      参数整定找最佳，从小到大顺序查
      先是比例后积分，最后再把微分加
      曲线振荡很频繁，比例度盘要放大
      曲线漂浮绕大湾，比例度盘往小扳
      曲线偏离回复慢，积分时间往下降
      曲线波动周期长，积分时间再加长
      曲线振荡频率快，先把微分降下来
      动差大来波动慢。微分时间应加长
      理想曲线两个波，前高后低4比1
      一看二调多分析，调节质量不会低

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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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