Watlow PPC-2000 - Manual (Page 251)

PPC-2000 User’s Guide Chapter 6: Tuning and Control
Doc.# 30002-00 Rev 2.3 Watlow Anafaze 223
Proportional, Integral and Derivative Control
Derivative control corrects for overshoot by anticipating the
behavior of the process variable and adjusting the output
appropriately. For example, if the process variable is rapidly
approaching the set point from below, derivative control
reduces the output, anticipating that the process variable will
reach set point. Use derivative control to reduce the overshoot
and oscillation of the process variable common to PI control.
Figure 6.4 shows a process under full PID control.
Figure 6.4 Proportional, Integral and
Derivative Control
PB
SP
PV