4、力传感器检测水压信号,送入PLC并与设定值比较进行PID运算,从而控制变频器的输出电压和频率,进而改变水泵电机的转速和供水量。这样使管网水压力始终保持在设定值附近,从而实现恒压供水。残骛楼諍锩瀨濟溆塹籟。关键词:PLC,变频调速,PID控制,恒压供水北京航空航天大学毕业设计(论文)第II页DesignOfConstantPressureWaterSupply ControlSystemBasedOnPLC酽锕极額閉镇桧猪訣锥。AbstractAccordingtothedesignof city water
6、efrequencyspeedcontrol ofthree-phase motorpump, using "openfirst principleofswitching operationofthepump to stop". Thepressure sensortodetectthepressure signal intoPLC, and comparedwiththesetvalue forPIDoperation,soasto controltheinverter output voltageand