all pump motors to maintain a desired system output pressure a second proportional integral differential control loop associated with each pump adjusts pump speed to equalize a load profile for each respective pump application_number US 39865009 A description while embodiments of this invention can take many different forms specific embodiments thereof are shown in the drawings and will be described herein in detail with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention as well as the best mode of practicing same and is not intended to limit the invention to the specific embodiment illustrated embodiments of the invention adjust the speed of all operating pumps based on desired system pressure while equalizing load profile for all operating pumps while operating variable frequency drives sense various parameters such as operating frequency current and voltage such data is available to embodiments of the invention in analog or digital form data can be acquired from displaced pumps via a data link such as a serial data link implemented using a publicly available telecommunications system or via a computer network for example the internet in an aspect of the invention a determination can be made as.