WEG CFW900 - Dynamic Braking

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INSTALLATIONANDCONNECTION
A B
C
D E
Figure3.13:Groundingscrewsforfiltercapacitorsandvaristors
3.2.4.2DynamicBraking
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NOTE!
AllmodelsofframesA,B,C,DandEwithfixedsuffixDBhaveinternalbrakingIGBT,whichisavailable
inthestandardversionofframesA,BandCandasanoptionaliteminframesDandE.
Thebrakingtorquethatcanbeobtainedfromthefrequencyinverterwithoutbrakingresistorsvariesfrom10%to
35%ofthemotorratedtorque.
Brakingresistorsshallbeusedtoobtainhigherbrakingtorques.Inthiscase,theenergyregeneratedinexcessis
dissipatedinaresistormountedexternallytotheinverter.
Thistypeofbrakingisusedincaseswhereshortdecelerationtimesaredesiredorwhenhighinertialoadsare
driven.
The“OptimalBraking”featuremaybeusedwiththevectorcontrolmode,whicheliminatesinmostcasestheneed
ofanexternalbrakingresistor.
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