目录...............................................................1.......................................................2...........................................3.......................................3...................................3...........................................4.................................................4.....................................................4...........................................5.............................................6.................................................7.......................................8.............................................9.....................................9......................................................10..........................................................10..............................................................11.......................................................12....................................................12...............................................12........................................................13........................................................13....................................................13......................................................14................................................14..............................................14.......................................................15......................................................15..........................................................17..................................................17..............................................................19.................................................................19.....................................................................21.................................................................22PLC恒压供水系统的应用摘要:针对传统供水系统压力不稳定、能源浪费严重、自动化程度低等缺点,基于PLC和变频器的恒压供水系统的设计。这个系统使用了频率转换器,PLC和PID调节器构造的闭环自动调节恒压供水系统。供水系统的控制目标为总管道的出水压力,将给定压力值和反馈的出水压力值相比较,把偏差值送到CPU中进行处理,从而发出控制指令来调整水泵电动机投入运行的台数和调节水泵电动机的转速,以保持总管道出水压力的稳定。PLC和逆变器自动调整的增加和泵的数量的减少和泵马达的速度,从而减少了能量的过度消耗。又防止了电动机启动时电流对供水设备的影响,实现了恒压供水。关键词:PLC;变频器;PID调节器;恒压供水ApplicationofPLCConstantPressureWaterSupplySystemAbstract:Aimingatthedisadvantagesofunstablepressure,seriousenergywasteandlowautomationoftraditionalwatersupplysystem,theconstantpressurewatersupplysystembasedonPLCandfrequencyconverterisdesigned.Thissystemusesfrequencyconverter,PLCandPIDregulatortoconstructaclosed-loopautomaticregulationconstantpressurewatersupplysystem.Thecontrolobjectiveofthewatersupplysystemistheoutletpressureofthemainpipe.Comparingthegivenpressurevaluewiththefeedbackpressurevalue,thedeviationvalueissenttotheCPUforprocessing,andthecontrolinstructionisissuedtoadjustthenumberofpumpsandmotorsinoperationandspeedofwater-savingpumps,soastomaintainthestabilityoftheoutletpressureofthemainpipe.TheincreaseofautomaticadjustmentofPLCandinverters,thedecreaseofthenumberofpumpsandthespeedofpumpsandmotorsreducetheexcessiveconsumptionofenergy.Italsopreventstheinfluenceofthecurrentonthewatersupplyequipmentwhenthemotorstarts,andr...