Introduction - Honeywell EXCEL 5000 User Manual

EXCEL CARE CONTROL ICONS

INTRODUCTION

Purpose 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 68F (20C).
Control loops consist of a series of "control icons" that dictate a sequence of events.
Control icons provide preprogrammed 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).
Assumptions This manual assumes you are familiar with the CARE process, especially the control
strategy and switching logic functions. See Excel CARE User Guide 74-5587 (US) /
EN2B-0182 ( Europe) for details and procedures for the control strategy and
switching logic functions.
Temperature Differentials In the English measurement system, degrees Fahrenheit (F) usually represent both
the temperature measure and the differential measure. Dialog boxes shown in this
manual represent temperatures as °F and differentials as F Deg.
Manual Organization 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.
The Examples chapter describes applications that combine more than one control
icon to perform functions. These examples are in addition to the individual examples
for each icon in the Alphabetic Reference chapter.
Appendix A: Parameter List Description provides information about the parameter
list file generated by CARE when a plant is translated. This file documents the
parameters used in the control icons and switching logic tables. It is useful during
plant testing.
Appendix B: STARTUP User Address describes how the STARTUP user address
works and how to use it in control applications.
9 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)