MFMA452D5V3

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描述

MFMA452D5V3

变频调速技术是一种新型的、成熟的交流电机无级调速驱动技术,它以其独特优良的控制性被广泛应用在速度控制领域。特别是在供水行业中,由于生产安全和供水质量的特殊需要,对恒压供水压力有着严格要求,变频调速技术也得到了更加深入的应用。
    成都市自来水公司六厂日产水量60万吨,担负着成都市区及周边地区70%以上的供水任务。自1996年年底六厂的三期工程投产后开始向郫县供水,使得我厂的供水方式从单一的重力流供水变为重力流和压力流结合供水的方式。自向郫县供水以来,由于考虑到现阶段郫县的用水量较少,从节约能耗的角度出发,我厂使用一台泵同时向郫县供水和提供我厂的自用高压水。为了满足六厂自用水压力,保证厂内各个工艺环节设备(如消毒环节中的水射器)能正常工作,我厂自用水压力须较恒定的控制在0.3Mpa以上,采用变频调速控制是保证压力恒定较为有效的方法。根据我们对郫县城区供水量的了解,发现郫县全天各时段用水量变化较大(见后图5),如果不对供水量进行调节,管网压力的波动也会很大,容易出现管网失压或爆管事故。采用变频恒压供水控制后,当郫县用水量较小时,这时相应管道和泵出口压力均较大,变频恒压控制方式将会降低泵的频率,减小泵出水量,从而降低管网压力;反之亦然。这样,小时用水量变化较大也不会造成管网压力有较大的波动。经过长期运行实践,证明了变频调速手段实现恒压供水不仅保证厂内自用高压水压力足够且稳定,而且保证了郫县供水的安全可靠性。

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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

15天包退换 一年质保 大量现货  国内实力库存商家


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。