Watlow PPC-2000 - Manual (Page 256)

Chapter 6: Tuning and Control PPC-2000 User’s Guide
228 Watlow Anafaze Doc.# 30002-00 Rev 2.3
General PID Constants by Application
This section gives PID values for many applications. They are
useful as control values or as starting points for PID tuning.
Proportional Band Only (P)
Set the Proportional Band to 7% of the Setpoint.
(Example: Setpoint = 450: Proportional Band = 31).
Proportional with Integral (PI)
Set the Proportional Band to 10% of Setpoint.
(Example: Setpoint = 450: Proportional Band = 45).
Set Integral to 60.
Set Derivative to Off.
Set the Output Filter to 2.
PI with Derivative (PID)
Set the Proportional Band to 10% of the Setpoint.
(Example: Setpoint = 450: Proportional Band = 45).
Set the Integral to 60.
Set the Derivative to 15% of the Integral.
(Example: Integral = 60: Derivative = 9).
Set the Output Filter to 2.
Table 6.4 shows general PID constants by application.
Table 6.4 General PID Constants
Application
Proportional
Band
Integral Derivative Filter
Output
Type
Cycle
Time
Electrical heat with SSR 50°F 60 15 4 DZC -
Electrical heat with EM relays 50°F 60 15 6 TP 20
Cool w/ solenoid valve 70°F 500 90 4 TP 10
Cool w/ fans 10°F off 10 4 TP 10
Electric heat with open heat coils 30°F 20 off 4 DZC -
Gas heat w/ motorized valves
SP>1200 60°F
100°F
120
240
25
40
8 Analog -