Abstract

Variable Frequency Drives are considered the most energy-saving and efficient way to control motors in today's HVAC systems, supported by reams of proven energy savings and performance test data. However, the proliferation of drives has uncovered a problem for some users - harmonics. Harmonics can create a number of problems in a plant or facility. It can cause additional motor heating as well as higher current draws through connected transformers and feeder equipment. Sensitive equipment such as instrumentation, computers, and communications systems, may function improperly or be damaged in severe cases of voltage distortion. In addition, harmonics can add costs in over-sizing transformers to accommodate perceived or false load requirements that are reflected back onto the power line. A new harmonics reduction technology pioneered by Siemens Building Technologies is featured in their SED2 Drive family. Read how Siemens significantly reduces harmonic distortion without additional AC line reactors or DC link chokes.

Click: http://www.sbt.siemens.com/HVP/Components/Documentation/SI033WhitePaper.pdf

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