Chapter 5: LogicPro and Modbus Reference
PPC-2000 User’s Guide
180
Watlow Anafaze
Doc.# 30002-00 Rev 2.3
Setpoint
The setpoint is the desired value for the process variable. The
setpoint may be set to any value within the range of the type of
the input selected as the
Process Variable Source
for the channel.
If the setpoint set is out of the defined range, the controller
assigns the closest number within the range.
Control Mode
This parameter indicates the mode of control for the channel.
lists and describes the values to which this
parameter can be set.
Table 5.18
Control Mode
Heat/Cool Feedback Value
The raw output value in parts per thousand (0.1%) calculated
by the PID algorithm. In a normal control loops this value is
filtered with the output filter before it becomes the
Heat Output
or
Cool Output
.
Heat/Cool Proportional Band (Heat/Cool Prop Band)
The proportional band is used to calculate PID output. Larger
numbers result in less proportional action for a given error or
deviation from setpoint. This parameter is set in engineering
units to a positive value less than the sensor range.
Heat/Cool Integral
The integral term controls the amount of influence the history
of error has on the output. Increasing the integral value
decreases the integral contribution to the output. Zero is a
special case that disables integral action. This value is in
seconds per repeat.
Value
Mode
Description
0
Off
Control algorithm is inactive and no output
is set.
1
Manual
Output is set by the user or a logic program.
See
Heat Output and Cool Output in this
section.
2
Auto
Output is determined by the PID or on/off
control algorithm.
3
Tune
The PPC determines and sets the propor-
tional band, derivative and integral parame-
ters for the channel by setting the output
and measuring the system’s response. See
Autotuning on page 93.
Summary of Contents for Anafaze PPC-2000
Page 2: ......
Page 14: ...Table of Contents PPC 2000 User s Guide viii Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 24: ...List of Tables PPC User s Guide xviii Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 36: ...Chapter 1 Overview PPC 2000 User s Guide 12 Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 112: ...Chapter 2 Hardware Installation PPC 2000 User s Guide 88 Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 184: ...Chapter 4 Troubleshooting PPC 2000 User s Guide 158 Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 296: ...Chapter 7 Specifications PPC 2000 User s Guide 268 Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 310: ...Appendix A Modbus Protocol PPC 2000 User s Guide 282 Watlow Anafaze Doc 30002 00 Rev 2 3...
Page 311: ...Doc 30002 00 Rev 2 3 Watlow Anafaze 283 B Appendix B Declaration of Conformity...
Page 319: ...PPC 2000 User s Guide Glossary Doc 30002 00 Rev 2 3 Watlow Anafaze 291...
Page 320: ...Glossary PPC 2000 User s Guide 292 Watlow Anafaze Doc 30002 00 Rev 2 3...