Page 5 - DV-series
P. 5
Mechanism of compressor with frequency control:
CURRENT FOR DIFFERENT STARTING CIRCUITS OF AN INDUCTION MOTOR
% Nominal current 800 Soft starter Star-delta switching
600
Direct starting
Frequency converter
400
200
0
2 4 6 8 10 12 14 16 18 20 22 24 26 seconds
Varying compressed-air demand involves a change in pressure in a plant’s compressed-air system. A pressure
sensor installed in the compressor brings about a change in system pressure by means of a corresponding
signal sent to the compressor’s controller. Via the frequency converter, the controller sets a speed for the
electric motor to match the compressor’s required output. In this way, the plant’s compressed-air system
pressure is kept at a constant value.
The frequency converter means that compressor start-up is associated with very low starting currents. This
has a positive effect on the service life of the electrical motor and the electrics.
www.comprag.com STATIONARY SCREW COMPRESSORS DV-SERIES 5
