Method for modulation lag compressor in multiple compressor system

Abstract

A method for controlling modulation of at least one compressor in a compressor system includes the steps of providing a host controller including a microprocessor for controlling overall operation of the compressor system. The host controller includes a microprocessor and memory for storing system values and transmitting load, unload and modulation commands to the at least one compressor. The at least one compressor includes a compressor controller having a microprocessor in communication with the host controller, a discharge port for discharging compressed fluid from the compressor, and a pressure sensor in communication with the discharge port for sensing the pressure of the compressed fluid discharged therefrom. The sensor is in signal sending relation with the compressor controller. The method also includes transmitting a modulation command from the host controller to the compressor controller of the at least one compressor upon the occurrence of a predetermined event. After the at least one compressor receives the modulation signal, the local controller establishes a modulation range for the at least one compressor including sensing the pressure of the compressed fluid discharged from the at least one compressor, transmitting the sensed pressure signal to the compressor controller of the at least one compressor, and establishing the modulation range of the at least one compressor based upon the sensed pressure signal.

Dependencies are inferred from the claim text.