tyma
ageme
t．Thetraditio
almea
sofwatersupplysuchasthepumppressurizatio
watersupplyatco
sta
tspeed，watertowerofuppercistem，thejaretc．arehardtosatisfythe
eedsofcurre
teco
omiclife，becauselowefficie
cy，reliabilitya
dautomatio
levelareallcommo
lyexisti
gi
thesemea
s．Accordi
gtotherequireme
tofwatersupplyi
aabidi
gplace，asetofautomaticsystemofco
sta
tpressurewatersupplybyusi
gvariablefreque
cya
dremotemo
itofi
ga
dcomrolli
g，wrhichiscomposedofPLC，tra
sducerpressuresystemhasthefu
ctio
slikeautomaticco
sta
tpressureoperatio
ha
da
dtheo
thespotco
trolbyha
detc．Thesystemhasproblemexisti
gi
thetraditio
alwayofwatersupplywhichhasfu
ctio
stostre
gthe
thecomputera
dpromotesthesystematicoverallperforma
ce．Basedo
thatthethreesideofthepumpwaterdeliveryratea
dthepumprotatio
alspeedbecomedirectratio，thepapera
alysesthemecha
ismofe
ergysavi
gthatthewayofwatersupplybyusi
gthemethodofvariablevelocityvariablefreque
cyissuperiortothetraditio
alwayofco
sta
tpressurewatersupplyco
trolledbyvalve．Setti
gupi
adva
cetheparameterofthePHmodularbuilti
thetra
sducerasystemofclosedcircuitusi
gthefeedbackofhydraulicpressureoffar．biograhypressuretablecha
geofwaterco
sumptio
withPID，i
thesphereofgraderegulatio
，thesystemofa
dsavee
ergyefficie
tly．
2
se
sorpumpsa
dbyusi
gvariable
electromotors，computera
ddeviceofcommu
icatio
isdesig
edtothate
d．Thissetoffreque
cy，automaticworkfreque
cyoperatio
，a
dthefu
ctio
oflo
gra
geco
rolbysolvedefficie
tlythevarioussuppleme
tarycombi
atio
with
reliability．Thesystemhasa
orga
ic
hasformed．Accordi
gtothe
wholerateof
owcombi
i
gthe
co
sta
tregulatio
ofthepumpoffreque
cyco
versio
withtheworkfreque
cypumpclosedcircuitca
realizetheco
sta
tpressurewatersupply
f兰州理工大学毕业设计说明书
Thispaperdiscussesthereaso
abilityofwatersupplyschemewithmuchpumpparallelco
ectio
，a
da
alysestheco
versio
co
ditio
a
dthevariousstatesofwatersupplyofthemuchpumpwayofwatersupplyaswellastheswitchprocessa
dtheproblemofage
eratorfromvariablefreque
cyoperatio
modetoworkfreque
cyoperatio
mode．Thispaperhasalsogive
theelectricaldesig
schemea
dPLCco
trolli
gprogramschemethatrealizeseffectivestatecirculati
gco
versio
co
trol．Byresearchi
gthecommu
icatio
agreeme
tbetwee
thecomputera
dPLC，thispaperhasfi
ishedsetti
gupthecommu
icatio
betwee
uppera
dlowercomputera
dalsohasdescribedthemethodtocompilecomputermo
itori
gprogramtorealizethelo
gra
gemo
itori
ga
dfaultreporti
gforwatersupplysystemthroughcommu
icatio
modularKeywords：Co
sta
tpressurewatersupply；PLC；Variablevelocityvar