Systems Controlled with a Sequencer - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18
Language
English

The minimum on and off times of the sequencer create problems for PRAC+ adaptive tuning. Unless the minimum on and minimum off times are very short, the sequencer causes large cycling in the process variable. PRAC+ monitors these oscillations and tunes the PID controller to a sluggish state. It is not possible to configure the minimum tune band and the dead band of the PID to allow PRAC+ to tune these systems.