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Tuning and Control Loop Performance, Fourth Edition, 4th Edition by Gregory K. McMillan

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APPENDIX K

PID FORMS AND CONVERSION OF TUNING SETTINGS

CONVERSION OF SETTINGS TO CORRECT UNITS AND FORM

The equations in this book are based on the ISA Standard Form with specific tuning setting units where the controller gain is dimensionless, the reset time is seconds (seconds per repeat), and the rate time is seconds. Proportional-integral-derivative (PID) tuning settings must first be checked for units and if necessary undergo a unit conversion before being used.

1.Convert proportional band (%) to controller gain (%/%) (dimensionless) Gain = 100%/Proportional Band

2.Convert reset setting in repeats per minute to reset time in seconds per repeat Seconds per repeat = 60/repeats per minute

3.Convert rate time in minutes to rate time in seconds ...

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