Instruction Manual

Doc.# 30002-00 Rev 2.3 Watlow Anafaze 219

Tuning and Control

This chapter describes the different methods of control

available with the your controller. This section covers:

• On/Off Control

• Proportional Control

• Proportional and Integral Control

• PID Control

• Control Outputs

• Tuning PID Loops

• PID Constants by Application

Introduction

This chapter explains PID control and supplies some starting

PID values and tuning instructions to help appropriately set

control parameters in the PPC system. For more information

on PID control, consult the Watlow Anafaze Practical Guide to

PID.

The control algorithm dictates how the controller responds to

an input signal. Do not confuse control algorithms with control

output signals (for example, analog or pulsed DC voltage).

There are several control algorithms available: On/Off,

Proportional (P), Proportional and Integral (PI), Proportional

with Derivative (PD), and Proportional with Integral and

Derivative (PID). P, PI, or PID control is necessary when process

variable (PV) cycling is unacceptable or if the process or setpoint

(SP) is variable.

NOTE!

For any of these control modes to function, the

channel must be in automatic mode.