Page 4 - DV-series

DV-series frequency control

A plant’s demand for compressed air varies throughout the day - from zero demand to peak demand.

PLANT DEMAND FOR COMPRESSED AIR
Output %
100

50

0 6 12 18 24
Monday–Friday Saturday Sunday

Conventional screw compressors are not able to switch between operating modes according to a plant’s
current demand for compressed air. Owing to constant switching between loading/unloading modes or the idle
running of compressors, conventional screw compressors consume consistently large amounts of electrical
energy when operating. The Comprag AV compressor series with frequency control has been created for
economical compressor operation where there is varying demand.

OPERATING COST OF COMPRESSOR
11 % 16 % Investment in purchase
16%
11%
10% 8% Servicing
10
%
8%
Commissioning
1%
1% 1%
1%
Energy consumption
78%
78 % 50 %
50%
Saving
25% in electrical
energy
COMPRESSOR without COMPRESSOR COMPRAG with
frequency control frequency control
AV compressors are provided with a frequency converter for continuous control of compressor output according
to the current demand for compressed air. They provide a plant with the necessary amount of compressed air
at a given moment and at a constant set pressure, while consuming only as much electrical energy as there is
demand for compressed air. This mode of operation conserves as much energy as possible.
Comprag compressors with frequency control allow a 25% saving in electrical energy consumption.

4 www.comprag.com STATIONARY SCREW COMPRESSORS DV-SERIES