6 IMTP2.2-ITTP2.2/4/5.5/7.5 ENG
5.2 Pump hydraulic connection
Connectthehydraulicsaccordingtotheregulationsinforce.
Thisproductcanworkwhenconnectedtothewaterworksortakingwaterfromawatercistern.
If you connect the system to the waterworks, you have to respect the regulations in force issued by local
authority(Common,localauthority,etcÉ).Itisimportanttoputapressureswitchontheinletleader;itswitches
offthemotorpowerincaseoflowpressure(itisadry-workingexternalprotection).Theinverterhavetwoports
foranormally-closedgenericcontact:ENandConthelogicboard(fig.4).
Verifytheamountofpressurebetweenthewaterworksandthemaximumpumppressure,doesnotexceedthe
maximumpumppressurevalue(nominalpressure)
Besides,itisimportanttoputapressuregaugeontheoutletleader,soitispossibletoregulatethepressure
factorysettingvalue,accordingtotherealconditionsofthesystem.On the outlet leader it is necessary to install
a pressure gauge with an output signal between 0 – 5 Vdc or 4 – 20 mA; this signal is an input to the inverter.
Asaruleitwouldbebettertoinstallflexibleorrigidpipesoninletandoutletbranches,on-offvalvesoninletand
outletbranches,anoreturnvalve,amembranesurgetank.Toavoiddryingthesystemforreplacementofthe
membranesurgetank,pressuregaugeorpressuretransducer,itwouldbebettertoinstallsomeon-offvalves
betweenthetankconnectionandthesystem.Putthepressuretransducerdownstreamthenon-returnvalve,ifit
ispresent.Itwouldbebettertoinstallacock,usedduringthesystemcalibration;itisnotnecessaryifthereis
anexitnearthepump.Besurethesurgetankallowsthesystempressure.
Checkthepre-stresspressureofthesurgetankbeforeconnectingittothesystem.
5.3 Electric connections
Checkvoltageandfrequencyofthepowersupplyarethesameofthenominalvaluesofthecontrolsystem,that
arewrittenonthebox.Becertainofhavingagoodshort-circuitprotectioninyourelectricsystem.
Beforeworking,becertainallthecircuitiswithoutvoltage(alsotheconnectionsvoltageclear).Disconnectthe
inverterfromthepowersupplybeforeworkingonelectricalormechanicalpartsofthesystem.
Waitatleast2minutesafterthepowersupplydisconnectionbeforeworkingontheinverter;this
allow the capacitors discharge (in order to be sure they are completely discharged, the led
placedinsidetheinverter,ontheelectronicboard,havetobecompletelyswitchedoff).
Ifthelocalregulationaboutelectricsystemprovidesforamagneto-thermaldifferentialswitch,
installone.Selecttheprotectionwithcurveforalternativecurrentorpulsingcurrent(typeAorC).
Theunitisequippedwithallthosetechnicalarrangementsrequiredtoensureagoodfunctioningundernormal
situationsinstallation.
The control system has a entry-filter and it conforms to the EMC directive, also have a current overload
protectionwhichguaranteesabsoluteprotectionwhentheInverteriscombinedwithmotorsthatnotexceed the
maximumpower.
IMPORTANT: For EMCis necessary that thepower wires of control panel and motor power wires (when the
motorareseparatedfromtheinverter)areshieldedtype(orarmoured)withindividualconductorsofappropriate
section (current density <= 5 A/mm2). These cables must be the minimum length necessary. The screen
conductormustbeconnectedtothegroundbybothsides.Onmotorusethemetalcaseforconnectiontothe
groundofthescreen.
To avoid loops that can create mass disturbances radiated (antenna effect), the motor operated by the
frequency converter must be connected on the ground individually, always with a low-impedance using the
metallicboxofthemachine.
ThewiresfrompowersupplytofrequencyconverterandwiresfromfrequencyconverterÐmotor(ifthemotoris
separatedtotheInverter)mustbespacedasmuchaspossible,nottocreateloops,notmakethemrunparallel
lessthan50cm.
5.4 Motor-pumps phases connection
The single-phase inverter IMTP2.2 must be
installed on asynchronous three-phase motor
with 100-240Vac 50/60 Hz voltage supply.
Phases must be configured to Delta mode if
the motor is 230V / 400V (most common
case,asinFigure3).
Figure 3 – Delta motor phases connection
