描述
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。
同时为了在就地手动控制实现在控制现场对变频泵进行开停控制和运行数据监视。我们在变频泵工作现场安装了A-B公司的PanelView图形工作终端,该工作终端提供图形交互界面和触摸输入方式,以从站的方式与PLC进行通信,进行数据和控制命令的交换,提供就地监控操作的通道。
欧美品牌停产的,常用的“PLC”备品备件
我司产品应用于以下领域:
1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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ABB SDCS-CON-3A NEW Free Ship
ABB SPAD346C3 SPAD 346 C3 DIFFERENTIAL RELAY PROTECTION
ABB Size 5 Welding Isolation Contactor EHW-250WC-1L NEW
ABB AC DRIVE ACS 600 25HP 3PH ACS601-0025-4-S00B1200801
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FISHER ROSEMOUNT 3095-FH23ABB13AB100AA NSPP 3095FH23ABB
ABB ACS 600 20hp Variable Frequency Motor Drive NEW
ABB 3HAB2242-1 CPU Robot 3HAB22421 USED Free Ship
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SGMG-20A2ABB YASKAWA
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ABB Circuit Breaker SACE S6N 600A 3P LI
ABB 3HAB2241-1 CPU BOARD
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ABB 3HAA3563-AHA S3 DSQC249B RECTIFIER BOARD
NEW ABB 3HNM06855-1 Purge Sensor 3HNM 00272-1.
TAYLOR ABB MOD 300 CPU 6204BZ10100
75HP ABB MOTOR DRIVE#ACS601-0050-4-000B1200881
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ABB 3HAA3573-ACA BACKPLANE 3HAA3573ACA
ABB ROBOTIC MOTOR 1FK6083-6AZ21-9ZZ9-ZS03
ABB DIGITAL I/O-HARMONY BLOCK I/O P-HB-DIO-40010000
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