Kaeser Sigma Frequency Control

Variable speed drive compressors are one of several strategies to reduce energy consumption in compressed air production, and KAESER COMPRESSORS has pushed the boundaries of compressed air efficiency once again with the latest generation of SIGMA FREQUENCY CONTROL (SFC) rotary screw compressors. Our SFC models feature the latest generation of airends optimized for maximum performance over a wider range of flows at multiple pressure levels. Using IE4 super premium motors in combination with advanced and proven drive technology, we achieve the highest IES2 efficiency. These units are up to 25% more efficient than the competition.

Advantages of variable frequency drives

  • Meet varying loads:
    Most compressed air systems have varying loads and it is often more effective and efficient to apply multiple compressors to meet changing demand. In cases where the demand profile changes rapidly and frequently, variable frequency drive compressors may be recommended. By varying the frequency of the input electricity to the motor, these compressors speed up and down to match their air output to your demand.
  • Precise pressure control:
    Kaeser's SFC design includes highly accurate sensors to maintain stable pressure (± 1.5 psig), without wasting air by over-pressurizing the system. This also increases reliability and product quality in your plant.
  • Superior part-load performance:
    Kaeser's SFC units have superior part-load performance and make great trim machines. They can be easily integrated into a multi-compressor system to provide faster response to variations in air consumption. At the same time, they can reduce electricity costs since their electrical consumption varies directly with air production.
  • Soft start:
    Kaeser's frequency drives are the ultimate soft starter for your motor using the lowest start-up current. They eliminate heat spikes in motor windings, allowing unlimited motor starts. Of course, frequency drives usually have fewer starts/stops, which means less frequent loading and unloading, for less wear and tear on important mechanical parts.
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