Regulation method Using a modern, master control system the compressor central can be run optimally for different operating situations at the same time as safety and availability increase. Selecting the right regulation method allows the supplied quantity of energy to be reduced through a lower system pressure and the degree of utilization is optimized for each machine in the installation. At the same time availability increases, which reduces the risk of unplanned downtime. Besides, central control allows programming for automatic pressure reduction in the entire system, e.g. during operations at night and weekends. As compressed air consumption is seldom constant, the compressor installation should have a flexible design, for example, through the use of compressors with different capacities and speed controlled motors. Compressors with a prudent design can be run with speed control and screw compressors are especially suited for this, as their capacity and power requirement are virtually proportional to the speed.