BENTLY NEVADA 3500/42M 138708-01

BENTLY NEVADA 3500/42M 138708-01

BENTLY NEVADA 3500/42M 138708-01

联系人:刘经理

电话:0592-5580706   15359273796

1、导言
在国产高压变频器的规划中，为了前进高压变频器内部控制的灵敏性以及在现场运用的可扩展性，通常在高压变频器中内置PLC。自从20世纪70年代第一台PLC诞生以来，PLC的运用越来越广泛、功用越来越完善，除了具有强壮的逻辑控制功用外还具其他扩展功用:A/D和D/A转化、PID闭环回路控制、高速记数、通讯联网、中断控制及特别功用函数运算等功用，并可以通过上位机进行闪现、报警、记载、人机对话，使其控制水平大大前进。
本文以广州智光电机有限公司为攀钢集团成都钢铁有限公司污水处理厂规划出产的国产高压变频器ZINVERT-H800/B10为例，介绍了三菱PLC在高压变频器控制系统中的运用。
2、广州智光电机高压变频器简介
广州智光电机有限公司推出的新一代高功用ZINVERT系列智能高压变频调速系统为直接高－高型变频调速系统，通过直接调度接入高压电机定子绕组的电源频率和电压来结束电动机转速的调度从而到达节能的意图。它是集大功率电力电子控制技术、微电子技术、高速光纤通讯技术、自动化控制技术和高电压技术等多学科为一体的高新技术产品。该产品选用干流高功用专用双DSP控制系统和大规划集成电路规划，通过精确的数字移相技术和波形控制技术结束了高压电机的灵敏调度和能耗控制。
3、PLC在国产高压变频器中的规划运用
3.1 PLC首要逻辑控制
（1）用户要求高压变频器在呈现故障停机时能快速自动切换到工频旁路工作，笔者给高压变频器专门装备了可以结束自动旁路功用的旁路柜，如图1所示，K1～K4为手动操作刀闸，J1～J3为高压真空接触器。在变频器发生故障时，旁路柜可以在几秒内结束从变频到工频的转化;而变频器在工频工作时，通过1个按钮就可以结束变频器从工频到变频的转化。这样的控制要求增加了变频器整机控制逻辑的复杂性。
自动旁路柜控制逻辑扼要介绍如下：
变频调速系统退出变频转工频工作有两种办法，一种是自动办法，一种是手动办法，选择自动办法时，当变频器发生停机故障时变频器自动从变频转工频;选择手动办法时则需人工操作。
变频调速系统退出工频转变频工作也有两种办法，一种是自动办法，一种是手动办法，选择自动办法时，只需在控制柜上按一个按钮，变频器就自动结束从工频转变频;选择手动办法时则需人工操作.
（2）PLC控制系统原理图
PLC主机选用输入输出点数48点，型号为FX2N-48MR，PLC作为系统逻辑量控制的控制核心，在自动旁路柜的逻辑关系控制中起着至关重要的效果。
旁路柜的逻辑控制要求比较复杂，选用PLC控制，接线简略，前进了可靠性;旁路柜的逻辑更改也变得很简略，只需修正PLC梯形图程序就可以了，很便利满足用户现场的控制要求。
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