Danfoss AHF005 Design Manual

Also see for VLT AHF 005: Instruction manual Operating instructions Operating instructions Design guide

Contents

Danfoss AHF005 Design Manual Manual pdf 13 page image

Illustration 4.1: AHF005Illustration 4.2: AHF010Performance at 10% THvD has not been plotted. However, thefilters have been tested and can operate at 10% THvD but thefilter performance can no longer be guaranteed.The filter performance also deteriorates with the unbalance ofthe supply. Typical performance is shown in the graphs below:Illustration 4.3: AHF005Illustration 4.4: AHF0104.1.1 Power FactorIn no load conditions (the frequency converter is in stand-by)the frequency converter current is negligible and the maincurrent drawn from the grid is the current through the capaci-tors in the harmonic filter. Therefore the power factor is closeto 0, capacitive. The capacitive current is approximately 25 %of the filter nominal current (depends on filter size, typicalvalues between 20 and 25 %). The power factor increases withthe load. Because of the higher value of the main inductor L0in the AHF005, the power factor is slightly higher than in theAHF010.Following graphs show typical values for the true power factoron AHF010 and AHF005.Illustration 4.5: AHF005Illustration 4.6: AHF010Introduction to Advanced Ha... AHF005/010 Design GuideMG.80.C3.02 - VLT® is a registered Danfoss trademark 134 4