Watlow CPC400 Manual de usuario descargar pdf (Pagina 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

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 229 230

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