| 摘要 |
PURPOSE:To prevent a specified compressor from consumption in controlling the number of compressors by detecting discharge pressure of each compressor sent to an aggregate tank and unloading sequentially the compressors one every a predetermined time to control the volume of the last unloaded compressor. CONSTITUTION:When pressure in an aggregate tank reaches a predetermined one or more, respective compressors are unloaded every a predetermined time and the last unloaded compressor has the volum controlled. The other unloaded compressores are run unloaded until they are stopped irrespective of pressure. Also, compressors keeping unloading are stopped every a predetermined time. Thus, the running time of each compressor is averaged so that the specified compressor can be prevented from consumption in the control of the number of compressors. |
