Honeywell UDC2500 manual Tuning Set Up Group, Rate T

Configuration

3.4 Tuning Set Up Group

Introduction

Tuning consists of establishing the appropriate values for the tuning constants you are using so that your controller responds correctly to changes in process variable and setpoint. You can start with predetermined values but you will have to watch the system to see how to modify them. The Accutune feature automatically selects Gain, Rate, and Reset on demand.

ATTENTION

Because this group contains functions that have to do with security and lockout, we recommend that you configure this group last, after all other configuration data has been loaded.

Function Prompts

Table 3-4 TUNING Group (Numeric Code 100) Function Prompts

Function Prompt			Selection or Range of Setting			Parameter
Lower Display			Upper Display			Definition
English	Numeric		English	Numeric
	Code			Code
PB or GAIN	101		PB = 0.1 to 1000 %			PROPORTIONAL BAND (simplex) is the
						percent of the range of the measured
			Gain = 0.01 to			variable for which a proportional controller
		1000
						will produce a 100 % change in its output.
						GAIN is the ratio of output change (%) over
						the measured variable change (%) that
						caused it.
					100%
						G = PB%
						where PB is the proportional band (in %)
						If the PB is 20 %, then the Gain is 5. And, at
						those settings, a 3 % change in the error
						signal (SP-PV) will result in a 15 % change in
						the controller's output due to proportional
						action. If the Gain is 2, then the PB is 50 %.
						Also defined as "HEAT" Gain on Duplex
						models for variations of Heat/Cool
						applications.
						The selection of Proportional Band or Gain is
						made in the CONTROL parameter group
						under prompt PBorGAIN.
RATE T	102		0.00 to 10.00			RATE action, in minutes, affects the
						controller's output whenever the deviation is
			minutes
						changing; and affects it more when the
			0.08 or less = OFF
						deviation is changing faster.

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