ABB控制器MP9-21129K
ABB控制器MP9-21129K
中海德小陈
手机(微信):15306912905
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为了防止运行时由于压力变送器不可预见的故障造成PLC的PID运算调节失实,从而造成管网压力失恒引发失压或爆管的严重事故。我们分别在1#和2#变频泵后输水管上安装压力变送器,可以同时测到出厂输水管线上的压力;在PLC程序上对压力信号进行了相应的处理,在程序中设置选择软开关,调度人员可以在RSView上将其中一台压力变送器的值设定为“控制反馈值”,另一台压力变送器的值则设为“参考反馈值”(见图2:变频恒压供水系统控制图形界面(RSView工作站));对1#压力和2#压力值进行比较,相差0.1Mpa时,判断为,其中一只压力变送器出现故障,变频器控制转换为远程直接手动调频控制(通过RSView设置运行)。压力变送器正常工作时,“控制反馈值”经过平均滤波处理后,分别比较压力报警上限和下限值,如果超出控制范围,变频器控制转换为远程直接手动调频控制,否则“控制反馈值”作为PID调节的参数PV。
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ABB DSQC249B
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ABB DSQC 3HAA3563-AGA/2
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ABB DSQC266G 3HAB8801-1/2B
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ABB 3HAB2214-8/4 DSQC223
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资讯来源:ABB控制器MP9-21129K
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