Watlow CPC400 - Manual (Page 86)

Chapter 3: Operation and Setup CPC400 Series User’s Guide
72 Watlow Anafaze Doc. 0600-2900-2000
Figure 3.11 Example Application Using Cas-
cade Control
Table 3.10 Parameter Settings for the Primary
Loop in the Cascade Example
Table 3.11 Parameter Settings for the Second-
ary Loop in the Cascade Example
Menu Parameter Value Comment
(none) Set point 150˚F Desired temperature at the inner thermocouple.
Control Ht prop band 10
As the input drops 10°F, the output increases to
100 percent.
Control Ht integral 0 Only proportional control is used.
Control Ht derivative 0 Only proportional control is used.
Menu Parameter Value Comment
Cascade Cascade prim loop 1 Loop 1 is the primary loop.
Cascade Cascade low SP 150˚F
When the primary loop’s output is 0 percent,
the secondary loop’s set point is 150°F.
Cascade Cascade high SP 190˚F
When the primary loop output is 100 percent,
the secondary channel set point is 190°F.
CPC400
Water
Power
Controller
Loop 2 PID Output
Heater
Loop 1 Input
Process Variable
Loop 1: Primary Cascade Loop
Loop 2: Secondary Cascade Loop
Loop 2 Input
Process Variable
Outer
Thermocouple
Inner Thermocouple