PPC-2000 User’s Guide
Chapter 3: Operating with AnaWin 3
Doc.# 30002-00 Rev 2.3
Watlow Anafaze
91
The PPC-2000 provides two methods for coordinating a heat
and a cool output driven by a single channel. The
Control Type
parameter offers two choices PID1 and PID2.
describes these two algorithms.
Table 3.1
Control Types PID1 and PID2
PID1
Only the heat output or the cool output is on at
any instant in time. The spread parameter pro-
vides a minimum switching hysteresis between
the two outputs. The channel will not switch
from heating to cooling until the heat integral
sum has dropped to zero, which is to say until
the process variable has been above set point
for some amount of time.
When the spread is set to zero, however, the
channel switches from heat to cool depending
on the PID calculation only, regardless of
whether the process variable is above the set
point.
PID2
When a channel uses the PID2 control type, the
cool output will come on whenever the process
variable is above the set point by more than the
spread setting. The cool output remains on until
the process variable drops to the set point. The
heat output operates as it would if the cool out-
put were not enabled. This algorithm was devel-
oped for plastic extruders, but may be of benefit
whenever a load is typically heated but occa-
sionally needs cooling.
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...
