WEG CFW900 - 8.4 MECHANICAL DATA

English
TECHNICALSPECIFICATIONS
FD=FDta*FDfsw*FDal*FDothers
Where,
FDisthetotalderatingfactor;
FDtaisthederatingfactorduetotheinverterambienttemperature;
FDfswisthederatingfactorduetotheuser-setswitchingfrequency;
FDalisthederatingfactorduetoinstallationaltitude;
FDothersisthederatingfactorduetootherfactors.
8.2.2DeratingfactoraccordingtotheAmbientTemperature(FDta)
TheratedoperatingtemperatureofCFW900is-10°Cto50°C(14°Fto122°F)forframesA...D,and-10°Cto45
°C(14°Fto113°F)inframeE,withouttheneedtoreducetheoutputcurrent(Ta,nom=50°C(122°F)forframeA
...D,andTa,nom=45°C(113°F)forframeE).Thisisvalidconsideringtheinverterfactorysettings(ratedswitching
frequencyandthermalmanagementfunctionenabled)
(1)
.Thethermalmanagementfunctionprotectstheinverter
duringoverloadsthroughasmartcontrolthatlimitsthemaximumtemperatureoftheIGBTs.Ifitisnotpossibleto
operatewithaswitchingfrequencybelowtheratedoneduringoverloads,disablethethermalmanagementfunction
andconsider40°C(104°F)themaximuminvertertemperature.Themaximuminvertertemperatureisalso40°C
(104°F)whenyouwanttouseaswitchingfrequencyabovetheratedone.
(1)
Thisisalsovalidwhentheswitchingfrequencyissetatmaximumof2kHzforframesA...Dand1.5kHzforframeE.Inthiscasethe
maximumambienttemperatureoftheinverterisindependentofitsthermalmanagementfunction.
ItispossibletooperateCFW900withanambienttemperatureabovetheratedonebyapplyingcurrentderating,
asshownin
Figure8.2.Themaximumoperatingambienttemperatureisspecifiedinitem8.1.4ofthismanual.
102|CFW900