Instruction Manual

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