Variable Speed Drive (VSD) Screw Compressors

Choose a variable speed air compressor for superior part-load performance

VSD/VFD

kaeser sfc series 20 hp variable speed drive rotary screw compressor

Many of Kaeser's rotary screw compressors are available with variable speed drive using Siemens drive technology. Kaeser's engineers have optimized the airend design to accommodate a wide flow range with unmatched efficiency. The drive motor and Sigma Profile airend operate at low speeds, resulting in exceptional reliability and long life.

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.

10 to 30 hp variable speed compressors with belt drive: SFC 8 - 22S models

Model Rated Motor Power [hp] Min. Capacity [cfm] Max. Capacity [cfm]
SFC 8 10 hp 13 cfm 48 cfm
SFC 11 15 hp 21 cfm 73 cfm
SFC 15 20 hp 27 cfm 93 cfm
SFC 18S 25 hp 33 cfm 119 cfm
SFC 22S 30 hp 33 cfm 141 cfm


Flows at 125 psig

25 to 700 hp variable speed rotary screw compressors with direct drive: SFC 18 - 515 models

Model Rated Motor Power [hp] Min. Capacity [cfm] Max. Capacity [cfm]
SFC 18 25 hp 32 cfm 132 cfm
SFC 22 30 hp 36 cfm 154 cfm
SFC 30S 40 hp 37 cfm 176 cfm
SFC 30 40 hp 49 cfm 208 cfm
SFC 37 50 hp 54 cfm 248 cfm
SFC 45S 60 hp 69 cfm 276 cfm
SFC 45 60 hp 69 cfm 316 cfm
SFC 55 75 hp 81 cfm 385 cfm
SFC 75S 100 hp 102 cfm 478 cfm
SFC 75M 100 hp 129 cfm 547 cfm
SFC 90M 125 hp 136 cfm 641 cfm
SFC 110M 150 hp 119 cfm 700 cfm
SFC 75 100 hp 130 cfm 564 cfm
SFC 90 125 hp 129 cfm 672 cfm
SFC 110 150 hp 155 cfm 751 cfm
SFC 132S 175 hp 198 cfm 885 cfm
SFC 132 200 hp 198 cfm 951 cfm
SFC 160 250 hp 242 cfm 1105 cfm
SFC 200 250 hp 300 cfm 1257 cfm
SFC 250 350 hp 370 cfm 1439 cfm
SFC 315S 350 hp 370 cfm 1742 cfm
SFC 315 450 hp 465 cfm 2057 cfm
SFC 410* 600 hp 363 cfm 2537 cfm
SFC 515 700 hp 412 cfm 3116 cfm


Flows at 125 psig
* Not available in 460V

60 to 450 hp variable speed compressors, oil-free: CSG 75 SFC - FSG 500-2 SFC models

Model Rated Motor Power [hp] Min. Capacity [cfm] Max. Capacity [cfm]
CSG 75 SFC 75 hp 144 cfm 272 cfm
CSG 95 SFC 75 hp 169 cfm 338 cfm
CSG 125 SFC 100 hp 186 cfm 469 cfm
CSG 150 SFC 125 hp 186 cfm 536 cfm
DSG 200 SFC 150 hp 336 cfm 720 cfm
DSG 230 SFC 175 hp 338 cfm 872 cfm
DSG 270 SFC 200 hp 334 cfm 1033 cfm
DSG 320 SFC 250 hp 342 cfm 1207 cfm
FSG 420-2 SFC 350 hp 608 cfm 1422 cfm
FSG 500-2 SFC 450 hp 666 cfm 1702 cfm


Flows at 125 psig

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