Watlow MICRODIN - Manual (Page 41)

Proportional plus Integral (PI) Control
The droop caused by proportional control can be corrected by adding integral
(reset) control to the system. When the system has settled down the integral
(reset) value is tuned to bring the temperature or process value closer to the set
point. However, this may increase the overshoot that occurs at startup or when
the set point is changed. Used more with fast, high loss loads.
View or change the integral or reset value with Integral or Reset. To only view
the integral control value use Integral Term (PID Group).
Figure 4.9 — Proportional plus Integral Control
Wa t l o w M i c r o D I N 4 . 9
Features
Time
Temperature
C
Set Point
Proportional Band Droop Corrected
Overshoot