Re: [foxboro] Splitted range PID anti windup

Thanks for asking this question - I've been wondering about the same
question.
Is the pidxe still calculating errors and compensations despite HOLIM =3F=3F

Gary Anderson
Arizona Public Service

-----Original Message-----
=46rom: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Jaime Claramunt R. (Inforsa)
Sent: Thursday, December 23, 2004 10:49 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Splitted range PID anti windup


Hi all,

I have a PID loop controlling a splitted range actuators, I mean, a
PIDXE block which .out goes to 2 char funtions: one with in1=3D[0, 50,
100%]:out1=3D[0, 100, 100%]  and other with in2=3D[0, 50, 100%]:out2=3D[0, =
0,
100%].

Sometimes the actuator connected to the second char (2) is closed
manually so we cannot count on it, so I connected a logic to pidxe HOLIM
to limit the .out at 50% to avoid windup during this (50to100) range. So
it can "return" in good way from top. I have the feeling it's not right.

Is the pidxe still calculating errors and compensations despite HOLIM =3F=3F
I have too heavy response fot this second actuator when is returned to
auto (on). Do you have some more "elegant" way to do it =3F

thanks
Jaime Claramunt
INFORSA
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