Re: [foxboro] NONLOP function

Hi Jaime,

  I use the NONLOP on PIDA controllers for some of my feed sumps.  The HZONE
& LZONE numbers define the three areas of control - too high a level, too
low a level, and close enough to setpoint.  The KZONE works like a
multiplier for the tuning.

  I have a 4.0 foot setpoint with a plus or minus 2.5 inch band.  My KZONE
is 0.2.  As long as the sump level is close enough to setpoint the control
is very sluggish, but if it gets too high or too low then the control is
much more aggressive to bring the level back to near setpoint.

  The result is we are able to ignore minor level fluctuations, but if we
are in danger of cavitating the pumps from a low level, or overflowing due
to a high level, the PIDA controller protects us.

  The manual is not very clear on the NONLOP, and I did a lot of
experimenting with it before it became useful.  Our feed sumps are a little
small, and we used to get large swings and a lot of cycling.  The NONLOP
helped a lot.

Steve Murray
Asarco

-----Original Message-----
From: Jaime Claramunt R. (Inforsa) [mailto:jclaramunt@xxxxxxxxxxxxxxx]
Sent: Wednesday, January 19, 2005 07:25
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] NONLOP function


Hi List,

Does anybody knows how to work with NONLOP option on PIDXE block ?
Manuals are a little bit confusing...about HZONE and LZONE (percent of span,
absolute value, of error,)
Do you have an actual case ? 

Thx
Jaime Claramunt
INFORSA paper mill
 
 
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