The optional unloaded start valve (USV) is located under the sound enclosure.
Installed in the control cabinet: a star-delta starter (with remote operation capability), a sound enclosure fan control, an operating hours counter and KAESER CONTROL (the interface to KAESER's service facility).
Frequency control enables infinite blower speed adjustment and, with the addition of a pressure sensor, also enables pressure regulation. The control unit coordinates operation of the frequency controller and the blower unit. Flexibility is further enhanced by the supplied signal output / input and Profibus connections.