The DSD series of rotary screw compressors has been expanded with four models (the DSD 142, 172, 202 and 238), making it suitable for air deliveries from 13 to 24 m3/min (at 7.5 bar). The compressors are energy efficient, require minimal maintenance, provide reliability and are quiet. The unit’s depth has been reduced by more than 200 mm.
At the heart of each system is a DSD rotary screw compressor, which can be complemented by a thermally shielded refrigeration dryer module as required. This option not only provides both efficient compressed air production and drying, but also means that it requires less floor space.
As the use of variable speed drive has advantages for certain applications, all DSD models, including those with the refrigeration dryer module, are available with Kaeser’s Sigma Frequency Control (SFC).
Other features include: units feature a large, low-speed Sigma Profile airend (1500 rpm) equipped with flow-optimised rotors; rotary screw airends are powered by EPACT-rated drive motors; 1:1 drive design eliminates the transmission losses associated with gear or V-belt driven systems, as the motor directly drives the airend and internal PC-based ‘Sigma Control’ compressor controller has five preprogrammed control options that enable performance to be matched to actual air demand.
The units are also equipped with a cooling system which uses a radial fan that draws cool ambient air in through the cooler. The system prevents the cooling air from being pre-warmed and, as a result, optimises the cooling effect. This in turn enables low compressed air discharge temperatures and increases the efficiency and reliability of downstream compressed air treatment components, such as dryers and filters. Sound is also reduced.