一、系统介绍
该控制系统主要装置包括：可编程控制器（PLC）、变频器、压力传感器、PID控制器以及相关软件控制单元。该装置形成一套完整的、全自动的、智能的恒压供水控制系统。该系统能够以三种方式工作，分别为全自动、半自动和手动操作方式，其中后两种是在全自动方式出现故障时的弥补。
2全自动恒压供水控制原理
当主水管网压力传感器的压力信号4~20mA送给数字PID控制器，控制器根据压力设定值与实际检测值进行PID运算，并给出信号直接控制变频器的转速以使管网的压力稳定。当用水量不是很大时，一台泵在变频器的控制下稳定运行；当用水量大到变频器全速运行也不能保证管网的压力稳定时，控制器的压力下限信号与变频器的高速信号同时被PLC检测到，PLC自动将原工作在变频状态下的泵，投入到工频运行，以保持压力的连续性，同时将一台备用的泵用变频器起动后投入运行，以加大管网的供水量，保证压力稳定。若两台泵运转仍，则依次将变频工作状态下的泵投入到工频运行，而将另一台备用泵投入变频运行。当用水量减少时，首先表现为变频器已工作在低速信号有效，这时压力上限信号如仍出现，PLC首先将工频运行的泵停掉，以减少供水量。当上述两个信号仍存在时，PLC再停掉一台工频运行的电机，直到后一台泵用主频器恒压供水[4]。另外，控制系统设两台泵为一组，每台泵的电机累计运行时间可显示，24小时轮换一次，既保证供水系统有备用泵，又保证系统的泵有相同的运行时间，确保了泵的可靠寿命。
※： ※ 公司
Allen-Bradley 厦门泰尼电气有限公司
联系人：小黄（销售代表）
Triconex 固定电话：
FOXBORO QQ:2917675397
ABB 邮箱：2917675397@qq.c o m
SIEMENS 传真：
MOTOROLA 网址：www.xmtaini.c o m
XYCOM 地址：厦门海沧街道滨湖一里7号
Rexroth Indramat 邮编：361026
手机：
KLA-Tencor 200mm Finger Fork 0000824-002 Untested
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KLA-Tencor Shipping Energy Filter Assmbly 720-12647-002
KLA Tencor ASSY, X-SCANNER 760-032324-00
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KLA Tencor 7700M 4 Channel Motor Control 184586 REV B
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KLA-Tencor CRS1010 Camera Filter Assy 002032-3 SIEP10
KLA-Tencor CRS1010 Camera Filter Assy. 000056 000057
KLA Tencor Image Processor Board PN: 770-809195-000
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KLA-Tencor 3780-15510-001 KIT,RETROFIT,SOLENOID VALVE
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KLA Tencor 0085230-000
KLA-Tencor Computer Interface Board 307793 working
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GSI Lumonics KLA-Tencor Quantox Board CCA-10069
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KLA-Tencor Ref. Light Preamp 775-322364-000 untested
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Expedited shipping available
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KLA-Tencor CRS-1010 Control PCB 311-14988-1 working
KLA-Tencor CRS-1010S Review Station DC Power Supply
KLA-Tencor CRS-1010S DC Power Supply working
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