摘要 |
<p>Provided is a system for controlling the number of compressors that is capable of quickly correcting the difference between the discharge amount of a compressor and the use amount of a compressed-air-using apparatus, and suppressing pressure fluctuations. One compressor is stopped when the pressure detected by a pressure sensor rises to or above a decrease-compressors pressure (A), and if a pressure greater than or equal to the decrease-compressors pressure (A) is still maintained, one more compressor is stopped each time that a prescribed interval elapses. One compressor is stopped without waiting for the prescribed interval to elapse when the pressure detected by the pressure sensor rises to or above an immediate reduction pressure (C) in a region where the pressure change rate (?P) is greater than or equal to a set value (+?P1). In addition, one compressor is started when the pressure detected by the pressure sensor falls to or below an increase-compressors pressure (B), and if a pressure less than or equal to the increase-compressors pressure (B) is still maintained, one more compressor is started each time that the prescribed interval elapses. One compressor is started without waiting for the prescribed interval to elapse when the pressure detected by the pressure sensor falls to or below an immediate increase pressure (D) in a region where the pressure change rate (?P) is less than or equal to a set value (-?P1).</p> |