Watlow PPC-2000 - Manual (Page 247)

Doc.# 30002-00 Rev 2.3 Watlow Anafaze 219
6
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.