WEG CFW900 - Installation of the Braking Resistor

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INSTALLATIONANDCONNECTION
Table3.8:Dynamicbrakingspecifications
InverterModel
MaximumBraking
Current
(Imax)
[A]
MaximumBraking
Power(peakvalue)
(Pmax)
(2)
[kW]
EffectiveBraking
Current
(Ieffective)
(1)
[A]
Power(average)
DissipatedintheBraking
Resistor(P
R
)
(2)
[kW]
Recommended
Resistor
(3)
[Ω]
CFW900A04P5B215611327
CFW900A06P0B215611327
CFW900A07P3B220814420
CFW900A10P0B2502036108
CFW900A04P5T21047240
CFW900A06P0T21047240
CFW900A07P3T215611327
CFW900A10P0T2301222613
CFW900A13P0T2301222613
CFW900A19P0T2502036108
CFW900B26P0T2502036108
CFW900B34P0T2502036108
CFW900B45P0T2502036108
CFW900C56P0T2753054155
CFW900C70P0T21004072214
CFW900C80P0T21004072214
CFW900D0110T2DB24397174502
CFW900D0135T2DB24397174502
CFW900D0150T2DB24397174502
CFW900E0195T2DB400160287821
CFW900E0250T2DB400160287821
CFW900A02P7T41085280
CFW900A04P6T41085280
CFW900A06P3T41085280
CFW900A09P6T415128153
CFW900A14P0T4252013532
CFW900A17P0T4352818722
CFW900B26P0T4252013532
CFW900B33P0T4252013532
CFW900B39P0T47560381611
CFW900C49P0T47560381611
CFW900C60P0T47560381611
CFW900C70P0T415012077325
CFW900D90P0T4DB243194124513
CFW900D0123T4DB243194124513
CFW900D0146T4DB243194124513
CFW900E0200T4DB400320205842
CFW900E0240T4DB400320205842
(1)
Theeffectivebrakingcurrentshownisjustareferencevalue,asitdependsonthebrakingdutycycle. Theeffectivebrakingcurrentcanbe
determinedusingtheformulabelow,wheret
br
isgiveninminutesandcorrespondstothesumofallbrakingperiodsduringtheseverestcycle
offive(5)minutes.
I
eficaz
= I
max
·
√
t
br
5
(2)
ThevaluesofP
max
andP
R
(maximumandaveragepowerofthebrakingresistor,respectively)arevalidfortherecommendedresistorsandfor
theeffectivebrakingcurrentscontainedin
Table3.8.Theresistorpowerchangesaccordingtothebrakingdutycycle.
(3)
Forterminalspecifications(screwandtighteningtorque)andrecommendedterminaltypestoconnectthebrakingresistor(terminalsDC+and
BR),see
Table3.4.InverterswithframeCcontainplasticpartsinfrontoftheDC-,DC+andBRterminals,whichshouldberemovedtoaccess
theterminals.
3.2.4.2.2InstallationoftheBrakingResistor
Touseabrakingresistor,itisnecessarytocarryoutthefollowingprocedures:
InstallthebrakingresistorbetweenthepowerterminalsDC+andBR.
Usetwistedcablefortheconnection.Separatethesecablesfromthesignalandcontrolcables.
Sizethecablesaccordingtotheapplication,respectingthemaximumandeffectivecurrents.
Ifthebrakingresistorisinstalledinsidetheinvertercabinet,consideritsadditionaldissipatedenergywhensizing
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