GE PACSystems RX7i, Cpu Programmer'S Reference Manual

Page: 364 / 469

Chapter 7. PID Built-In Function Block
GFK-2950C February 2018 349
Words Parameter/Description
Low Bit
Units
Range
12
(11)
Minimum Slew Time
Minimum number of seconds for the CV output to move from 0 to full
travel of 100% or 32,000 CV Counts. It is an inverse rate limit on how
fast the CV output can change.
If positive, CV cannot change more than 32,000 CV Counts times the
solution time interval (seconds) divided by Minimum Slew Time.
For example, if the Sample Period is 2.5 seconds and the Minimum
Slew Time is 500 seconds, CV cannot change more than
32,000 * 2.5 / 500 or 160 CV Counts per PID solution.
The integral term value is adjusted if the CV rate limit is exceeded.
When Minimum Slew Time is 0, there is no CV rate limit. Set Minimum
Slew Time to 0 while tuning or adjusting PID loop gains.
Seconds /
Full
Travel 0 (none) to
32,000 sec
to move full CV
travel