This manual provides descriptions and application examples for control icons in Excel Computer Aided Regulation Engineering (CARE) software. You use control icons in the CARE Control Strategy function.
The control strategy for a plant consists of control loops that monitor the environment and adjust equipment operation to maintain comfort levels. For example, a control loop for an air handling system can turn on a return air fan when discharge air temperature in the return air duct is greater than or equal to 20 °C.
Control loops consist of a series of “control icons” that dictate a sequence of events. Control icons provide pre-programmed functions and algorithms to implement sequences of control in a plant schematic. Examples of control icons include a Proportional-Integral-Derivative (PID) function and a Maximum function (MAX).
This manual assumes you are an experienced AX user, especially the control strategy and switching logic functions.
This manual contains the following chapters:
This Introduction lists other technical literature related to control icons, describes the dialog boxes related to control icon operation, and provides a table that summarizes the available control icons.
The Alphabetic Reference chapter describes each control icon. The beginning of the chapter summarizes the type of information provided for each icon.