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4–12 Start–Up and Operation MN735
PI Terms PI is used to control the response of any closed loop system. It is
used specifically in system applications involving the control of drives to
provide zero steady state error between Setpoint and Feedback, together
with good transient performance.
Proportional Gain (
P
501)
This is used to adjust the basic response of the closed loop control system.
The PI error is multiplied by the Proportional Gain to produce an output.
Integral (
P
502)
The Integral term is used to reduce steady state error between the setpoint
and feedback values of the PI. If the integral is set to zero, then there will
always be a steady state error.
P Gain
I Gain dt
Setpoint
Error
+
–
+
+
Output
Feedback
(AIN2)
(AIN1)
S Functions as P, PI controller
S Single symmetric limit on output
A Method for Setting–up the PI Gains
Underdamped (oscillatory)
Critically Damped
Overdamped
OUTPUT
SETPOINT