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Selectronix, Inc.
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SLC4075 TouchScreen Gateway Installation & Operating Manual
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15
9.
New feature with TSGW Version 2.17+ and PGW V1.70+ PID Terms
The PID term’s contribution as a percentage of the step command is displayed on the active PID page. This
provides invaluable information in the PID tuning process.
a.
The percentage of step command provides insight when determining the initial value of each of the PID
multipliers, as well as when optimizing the interactive integral and derivative values. It shows the relative
interaction between the PID terms under dynamic conditions.
b.
The sum of the PID term percentages may add up to more than 100%, even though each term is individually
limited to 100% output.
i.
The Integral term’s range is 0 to 100%
ii.
Both Proportional and Derivative terms are limited to +/- 100%.
iii.
A negative Proportion term occurs when the process variable is above the set point in heat mode, and
vice versa in cooling mode.
iv.
A positive Derivative term occurs during a deceasing change in error in heat mode, and vice versa in
cooling mode.
PID
Ter