Patent ID: 6068447
Filing Date: 2000-05-30
Classification: F04B

Abstract:
A controller for a compressor system including a compressor, a motor for driving the compressor, an unloader for preventing the compressor from compressing gases, and a tank for receiving and storing compressed gases from the compressor, the controller comprising:a start/stop control for starting the motor upon an internal pressure of the tank falling below a pre-selected low pressure level, and for stopping the motor upon the internal pressure of the tank rising above a pre-selected high pressure level;a load/unload control for disabling the unloader upon the internal pressure of the tank falling below the pre-selected low pressure level, and for enabling the unloader upon the internal pressure of the tank rising above the pre-selected high pressure level,said load/unload control including a unload time dial operatively connected to the motor for setting a pre-selected unloading interval during which the motor runs while the unloader is enabled, the motor being shut-off upon expiration of said unloading interval if the internal pressure of the tank has not reached at least the pre-selected low pressure level;a control switch for selecting one of the start/stop control and the load/unload control; anda drain control for opening a drain of the tank upon a pre-selected operating time of the compressor;a drain control for pre-selecting cumulative operating time of the compressor and automatically opening a drain of the tank upon expiration of the pre-selected cumulative operating time of the compressor.