Kaeser Compressors, Fredericksburg, Va., has added its Sigma Frequency Control (SFC) variable speed
drive to its BSD and CSD Sigma rotary screw compressors. The company claims SFC is designed to
provide maximum efficiency over a wide flow range.
Kaeser offers a range of standard SFC compressor packages, including the direct drive
airend/motor package, which it says is designed to provide optimal efficiency over its entire speed
range. The packages also include a super-soundproofed enclosure and Environmental Protection