Honeywell UDC 3300 Introduction Set this group last Tuning group prompts, Parameter Definition

4.2 Loop 1 Tuning Parameters Set Up Group

Introduction

Set this group last

Tuning group prompts

Tuning consists of establishing the appropriate values for the tuning constants for a single loop controller. These parameters are also for Loop 1 of a 2-Loop or Cascade control configuration.

The Accutune feature automatically selects Gain, Rate, and Reset.

This section also contains Keyboard Lockout/Security selections.

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

Table 4-1 lists all the function prompts in the Tuning Set Up group and their definitions.

Table 4-1 Tuning Group Prompt Definitions

Lower Display

Prompt

PROP BD

or

GAIN

or

GAINVALn

RATE MIN

Upper Display

Range of Setting

or Selection

0.1to 9999 %

or

0.001 to 1000

Read Only

0.00to 10.00 minutes

0.08or less = OFF

Parameter

Definition

PROPORTIONAL BAND (simplex) is the percent of the range of the measured variable for which a proportional controller 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.

LOOP 1 GAIN— This is the value being provided by Gain Scheduling when enabled.

RATE action, in minutes, affects the controller's output whenever the deviation is changing; and affects it more when the deviation is changing faster.

Also defined as "HEAT" Rate on Duplex models for variations of Heat/Cool applications.

80 UDC 3300 Process Controller Product Manual 4/00