VFDs: Transformer KVA Ratings
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Is a line reactor recommended?

The recommendation to apply a line reactors (in front of the drive) is based on the kVA rating of the drive versus the kVA rating of the supply transformer (transformer upstream of the drive).  In the tables below, find the drive catalog number or horsepower rating, then move to the right to the “Max Supply kVA.”  If the supply transformer exceeds the value in this cell, a line reactor is recommended.  The part number for the Allen-Bradley recommended reactor is listed in the next column.


PowerFlex 520-Series



PowerFlex 750-Series


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