Compressor controller: SIGMA CONTROL 2

Integrated intelligence

The SIGMA CONTROL 2 unit coordinates compressed air generation and consumption. With its intelligent control, this advanced system prevents inefficient energy usage, especially in partial load operation.
Kaeser offers various compressor controllers suited according to particular requirement.

SIGMA CONTROL 2: for all KAESER rotary screw compressors, rotary screw blowers, reciprocating compressors, boosters and rotary lobe blowers

The SIGMA CONTROL 2 fulfils the highest requirements for an internal compressor controller and is based on advanced industrial computing technology. The control unit is linked with interchangeable input and output modules, allowing flexible matching to all available Kaeser rotary screw compressors, screw blowers, reciprocating compressors and rotary blower systems, as well as to external communications systems.

The benefits of SIGMA CONTROL 2

  • Troubleshooting support:
    The industrial PC saves the last 200 operational events, helping you and Kaeser Support to quickly find and reproduce faults. Furthermore, the built-in web server enables you to display operational data, maintenance and fault messages on any PC.
  • Ready for international use:
    The SIGMA CONTROL 2 offers 30 selectable languages. The logical menu structure simplifies operation.
  • Up-to-date quickly and easily:
    Software updates and operating parameters can quickly be uploaded and transferred via the convenient SD card slot. This minimises service costs and allows the SD card to be used for (long-term) storage of key operational data.

Our SIGMA CONTROL 2 compressor controller in detail

SIGMA CONTROL 2 equipment

Control systems

  • Modular design comprising control unit, input/output modules, power supply units and web server
  • Designed for use with Kaeser rotary screw compressors
  • “Traffic light” LEDs indicate operating status
  • Plain-text display
  • 30 selectable languages
  • Fully automatic monitoring and control
  • Dual, Quadro, Vario and Dynamic and Continuous control modes as standard, manual or external speed settings, control of process variables via setpoint/actual value input, integrated PI controller
  • Timer
  • Base-load sequencing function for operation of two compressors
  • Web server with remote display of operating data


  • Advanced processor hardware
  • All components designed for industrial operating conditions
  • Graphical display: Graphs showing pressure and compression temperature
  • LED indicators and tactile membrane keys
  • Real-time clock with battery buffer
  • Precision electronic pressure transducer

Control cabinet

  • Dust & splash water-resistant, IP 54
  • Input/output modules with easily identifiable plug-in connectors for the signal sensor connection cable
  • Terminal strip for additional floating contacts


  • SD card slot for updates and long-term storage of operating data
  • USS bus for frequency converter
  • RFID reader (Radio Frequency Identification)
  • Ethernet for connection to the SIGMA NETWORK, Master/Slave operation or web server for KAESER Connect
  • Slot for communications modules optionally available, not included on basic model for small systems, not available for SXC


  • CE
  • cULus
  • EAC
  • RoHs
  • WEEE2
  • Marine certification optional (DNV GL, ABS, LRS, RINA)
  • International radio certifications (FCC, IC, MIC/KS and RCM)

Web server

  • Control panel and menu structure visualisation, e.g. message history and display of graphs


Plug-in communication modules for:

  • Profibus DP-VO
  • Modbus TCP
  • DeviceNet
  • Modbus RTU
  • EtherNet/IP

* Not for SXC

SIGMA CONTROL 2 – Technical data

The technical specifications can be found in this brochure: