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Chapter 3: Operating with AnaWin 3
PPC-2000 User’s Guide
106
Watlow Anafaze
Doc.# 30002-00 Rev 2.3
Figure 3.7
How the Secondary Channel’s Set
Point is Determined When the Primary
Channel Has Only a Heat Output
Setting up Cascade Control
To setup cascade control:
1.
2.
Set up control for the secondary loop as you would for a
standard closed-loop application. See
3.
On the secondary channel:
a.
Select the primary channel’s output (
Channel # Out
) for
the
Set Point Source
setting.
b.
Set the
Min Set Point
to the desired set point when the
primary channel’s output is at its minimum value.
c.
Set the
Max Set Point
to the desired set point when the
primary channel’s output is at its maximum value.
Cascade Control Example
The temperature of a tank of water is controlled by a heater
near the bottom of the tank. Two thermocouples measure the
water temperature. One is placed near the heater and is
referred to as the
outer
TC. The other is placed in the center of
the tank and referred to as the
inner
TC. The desired
temperature of the water at the inner TC is 150°F.
The inner TC is connected to the first input on the Analog Input
module. Output 22 on the Processor module is used to drive a
solid state relay power control.
illustrates this application.
Set Point of the Secondary Channel
(Engineering Units)
Max Set Point
Min Set Point
0%
Primary Channel’s Heat Output (% of Full Scale)
100%
inner
outer
outer
outer
Содержание Anafaze PPC-2000
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Страница 14: ...Table of Contents PPC 2000 User s Guide viii Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 24: ...List of Tables PPC User s Guide xviii Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 36: ...Chapter 1 Overview PPC 2000 User s Guide 12 Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 112: ...Chapter 2 Hardware Installation PPC 2000 User s Guide 88 Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 184: ...Chapter 4 Troubleshooting PPC 2000 User s Guide 158 Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 296: ...Chapter 7 Specifications PPC 2000 User s Guide 268 Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 310: ...Appendix A Modbus Protocol PPC 2000 User s Guide 282 Watlow Anafaze Doc 30002 00 Rev 2 3...
Страница 311: ...Doc 30002 00 Rev 2 3 Watlow Anafaze 283 B Appendix B Declaration of Conformity...
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Страница 320: ...Glossary PPC 2000 User s Guide 292 Watlow Anafaze Doc 30002 00 Rev 2 3...