WEG CFW900 - Motor Cables

English
INSTALLATIONANDCONNECTION
!
WARNING!
ThemotoroverloadprotectionavailableintheCFW900isinaccordancewiththeIEC609047-4-2and
UL61800-5-1,standards,notethefollowinginformation:
“Trip”currentequalto1.25timesthemotorratedcurrent(C2.1.5)adjustedintheOriented“Start-up
”menu.
ThemaximumvalueofparameterC7.4.6(MotorThermalClass)is3(class20).
ThemaximumvalueforC2.1.11(Motorservicefactor)is1.15.
ThemaximumvalueoftheoverloadcurrentparametersC7.4.3,C7.4.4andC7.4.5is100%.
!
WARNING!
Ifadisconnectswitchoracontactorisinstalledbetweentheinverterandthemotor,neveroperate
themwithaspinningmotororwithvoltageattheinverteroutput.
Thecharacteristicsofthecableusedtoconnectthemotortotheinverter,aswellasitsinterconnectionandrouting,
areextremelyimportanttoavoidelectromagneticinterferenceinotherequipmentandnottoaffectthelifecycleof
windingsandbearingsofthecontrolledmotors.
Keepmotorcablesawayfromothercables,suchassignalcables,controlcables,etc.),accordingto
Table3.9.
Table3.9:Cableseparationdistance
CablelengthMinimumseparationdistance
≤ 30m≥ 10cm
>30m≥ 25cm
3.2.4.3.1Motorcables
Unshieldedcables:
CanbeusedwhenitisnotnecessarytomeettheEuropeandirectiveofelectromagneticcompatibility(IEC61800-
3).
Theemissionofthecablesmaybereducedbyinstallingtheminsideametalconduit,whichshallbegrounded
atbothends.
Itisnecessarytoconnectafourthcablebetweenthemotorgroundandtheinverterground.
✓
NOTE!
Themagneticfieldcreatedbythecurrentcirculationinthesecablesmayinducecurrentinclosemetal
pieces,heatthem,andcauseadditionalelectricallosses.Therefore,keepthe3(three)cables(U,V,
W)alwaystogether.
Shieldedcables:
Theyaremandatorywhenitisnecessarytocomplywiththeelectromagneticcompatibilitystandard,asdefined
byIEC61800-3standard“AdjustableSpeedElectricalPowerDriveSystems”.
Thesecablesactmainlybyreducingtheirradiatedemissionintheradio-frequencyrange.
Inreferencetothetypeanddetailsofinstallation,followtherecommendationsofIEC60034-25“GuideForDesign
andPerformanceofCageInductionMotorsSpecificallyDesignedForConverterSupply”,refertoasummaryin
Figure3.15.Refertothestandardforfurtherdetailsandeventualmodificationsrelatedtonewrevisions.
Thegroundingsystemshallbewellinterconnectedamongtheseveralinstallationlocationssuchasthegrounding
pointsofthemotorandtheinverter.Voltagedifferenceorimpedancebetweentheseveralpointsmaycause
thecirculationofleakagecurrentsamongtheequipmentconnectedtotheground,resultinginelectromagnetic
interferenceproblems.
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