Process Controls
PROPORTIONAL PLUS RATE CONTROL SYSTEMS
Proportional plus rate controllers take advantage of both proportional and rate control modes.
As seen in Figure 27, proportional action provides an output proportional to the error. If the
error is not a step change, but is slowly changing, the proportional action is slow. Rate action,
when added, provides quick response to the error.
Figure 27 Response of Proportional Plus Rate Control
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