[foxboro] cascade/constraint control

I have a control scheme that will normally run as level-flow cascade.  If
the temperature of the downstream equipment falls too low, then the flow
must be restricted.  I plan to use a constraint control scheme:


+-----------+            +-----------+             +-----------+
|           |            |           |             |           |
|    LC     | -------->  |   SIGSEL  |  -------->  |    FC     |
|           |            |   (low)   |             |           |
+-----------+            +-----------+             +-----------+
^
+-----------+                  |
|           |                  |
|    TC     | -----------------+
|           |
+-----------+

What are the recommended FBK and BCALCI connections for the LC and TC?  How
do I ensure that the TC does not wind up while it is not selected?

______________________________________________________________________________________


Greg Hurwitt
Engineering Associate

E-Mail:  gregory.hurwitt@xxxxxxxx
Postal Address:
BASF Corporation
602 Copper Road
Freeport, TX 77541
USA

BASF - The Chemical Company

 
 
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