基于plc的中央空调自动控制系统设计 .pdf
基于plc的中央空调自动控制系统设计.
TheXXXlargebuildings。XXX。accountingforabout50%
ofthetotalenergynofthebuilding。Usually。theloadofthe
chillerinthecentralairningsystemXXXwiththechangeof
seasonaltemperature。whilethematchingchillerXXXtheload。
almostrunningat100%loadforalongtime。causingagreat
wasteofXXXandqualityofthecentralairXXXthestructureand
workingprincipleofthecentralairningsystem。andthenuses
SiemensS7-200PLCasthemaincontrolunit。adoptingnalPID
controlalgorithmandcontrollingthewaterpumpspeedthrough
SiemensMM440frequencyconvertertoensurethatthesystemcan
adjusttheflowrateaccordingtotheactualloadn。achieve
constanttemperaturecontrol。andsavealotofenergy.
Keywords:PLC。centralairning。control
large-XXX。itconsumesasignificantamountofelectricenergy。
accountingforapproximately50%ofthetotalXXX。Oneofthe
XXXitsloadaccordingtothechangeoftemperatureandloadn。
Thenpumpandcoolingpumpmatchedwiththefrozenhostcan
alsoautomaticallyadjusttheload。XXX100%underloadn。This
notonlywastesagreatdealofenergybutalsoworsenstheXXX
andqualityofthecentralairningsystem.
Toaddressthisissue。thisXXXutilizesSIEMENSS7200
PLCasthemaincontrolunitandthenalPIDcontrolalgorithm。
ByusingtheSIEMENSMM440invertertocontrolpumpspeed。
thesystemcanadjusttheloadflowaccordingtotheactualn。
achievingconstanttemperaturecontrolwhileXXX.
Inn。thecentralairningsystemplaysaXXXbuildings。but
itshighXXX。weXXXXXXandqualityofthecentralairning
system。TheuseofPLCandcontrolalgorithmsXXXthe
performanceofthesystem.
3.2XXXMM440变频器性能介绍
西门子MM440变频器是一种高性能的电机控制设备,具
有广泛的应用场景。其主要特征包括:高效的电机控制、可靠
的性能、灵活的应用、易于维护等。这些特点使得MM440变
频器成为了许多工业领域中不可或缺的设备。
3.2.1主要特征
MM440变频器的主要特