PURPOSE: To make the operation of a compressed air device which copes with variation in load and reduces loss by saving electric energy, carrying out 24-hour unmanned operation, leveling the use time of a machine, operating it automatically to cope with instantaneous stop and power failure, etc. ;CONSTITUTION: Flowmeters FS1 to FS3 are provided in pipes P1 to P3 for connecting air compressors CP1 to CP5 to loads L1 to L3, air flow quantities passing through the loads L1 to L3 are measured and flow quantities for the loads are calculated by adding, and the number of operating air compressors among the air compressors CP1 to CP5 is controlled to keep balance the flow quantities for the loads with the air quantity fed from the air compressors CP1 to CP5.;COPYRIGHT: (C)1994,JPO&Japio
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