Altronic DE-3000 Quick Reference Manual

Quick Reference Guide
DE-3000 PROPORTIONAL INTEGRAL DERIVATIVE
Quick Description
A Proportional-Integral-Derivative
motor valves, including suction, recirculation (make-up), and back pressure valves. A PID controller continuously
calculates an error value as the difference between a desired set point and a measured process variable. It applies a
correction based on proportional, integral and derivative.
P Accounts for preset present values of the error. For example, if the error is large and
positive, the control output will be large and positive. The default value is 120%. The
lower this number moves, the faster the control output will react.
I Accounts for past values of the error. For example, if the current output is not
sufficiently strong, the integral of the error will accumulate over time, and the controller
will respond by applying a stronger action. The default value is 20 seconds. The lower
the number, the shorter the time before correction.
D Accounts for possible future trends of the error based on its current rate of change.
For example, if the rate of the current output is changing rapidly and approaching the set point, the derivative can
slow the rate to prevent the system from passing the set point. The default value is 999 minutes. The higher the
number, the more responsive this feature is.
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(PID) controller is a control loop feedback system commonly used for controlling
In this example the error is represented by the orange
circle. As the proportional moves the correction to
the set point, the derivative can attempt to slow the
correction down to prevent an overcorrection.
Should the correction stop short of the set point, the
integral will move the correction slowly, over time, to
the final set point.
This guide provides
clarification and additional
information to the Installation
and Operating Manual, Form
DE-3000 IOI 2-17.
Altronic literature can be
found at: www.altronic-
llc.com in the Technical
Library.