Kaeser HSD.3 series rotary screw compressor systems

The HSD.3 series rotary screw compressor systems are suitable for applications that require large volumes of quality compressed air with a small footprint. Two self-contained compressors are both installed within a single housing that is no larger than a single compressor.

System availability is optimised, with each compressor section operating independently from the other. This means that performance can be precisely adjusted to suit requirements and idling can be kept to an absolute minimum.

The design uses standard components and simple 1:1 direct drive systems. The drive motor and the compressor block are linked via a maintenance-free coupling, avoiding the transmission losses associated with gear-driven units.

Due to minimised internal pressure losses, the flow-optimised Sigma Profile screw compressor block and the inclusion of an IE4-rated drive motor, the rotary screw compressors offer improved specific power, which further contributes to the overall efficiency. The series can also be fitted with the Sigma Frequency Control (SFC) drive.

The units are controlled and monitored independently via two Sigma Control 2 controllers. Using the master-slave function, the controllers are able to precisely match the performance of each compressor to suit current compressed air demand.

With sound pressure levels as low as 71 dB(A), the series is available with total drive power of 360 to 500 kW and working pressure of 3.5 to 15 bar, with combined free air deliveries from 42.5 to 85.2 m³/min (fixed speed drive) and 52 to 85.4 m³/min (SFC drive) at 50 Hz.