6FC9348-7AT模块
6FC9348-7AT模块
维控plc在恒压供暖系统的应用
一、简介
供暖系统主要用于北方冬季暖气系统供暖,控制两电机对供暖系统水压控制在恒定范围内,用plc控制减小了工作人员工作量,*值班人员看守。
二、特点
1、使用维控的PLC,PLC型号为20MT。
2、PLC程序内置算法,通过modbus通讯读取水压值以及变频器当前频率值,当水压不够使plc控制变频器让补水泵开始工作,一定时间内,启动1#补水泵变频启动,变频一定时间即变频达到50hz,水压仍然达不到值,1#补水泵切换到工频,2#变频启动,直到水压保持在设定值内,当水压恒定在设定值内,即1#工频2#变频运行,此时如果变频器频率低于设定的频率运行**过设定时间,将自动切换到1#变频启动状态。2#电机停止运行。
3、系统中还包含无水信号、变频器故障报警信号。水箱中无水信号、变频器故障报警信号送达plc,系统停止工作。
三、组成部分
1、PLC负责动作的直接控制和外界反馈的信息的采集,实现供水系统的自动运作和故障检测。
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