Re: [foxboro] Windup in cascade configuration
- From: "Marrassini, Norberto" <Norberto.Marrassini@xxxxxxxxxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Wed, 23 Feb 2005 08:53:49 -0500
If you connect the FBK of Primary block to secondary measurement you =
will
have the anti-windup guaranteed. That is because you are opening the
positive feedback in the primary algorithm for integral action as the
secondary measurement froze by the limit of the output. Although the =
best
connection for handshaking signals between primary and secondary blocks =
for
operation of the cascade loop is as you can see in documents B0193AX =
for PID
block
Norberto Marrassini=20
Invensys Systems Argentina Inc.
Invensys Production Management Division
N=FA=F1ez 4334 - (C1430AND) Buenos Aires - Argentina=20
Phone: (54-11) 6345-2215 Fax: (54-11) 6345-2111=20
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx =
[mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of IQUEIROLOO@xxxxxxxxxxxxx
Sent: Wednesday, February 23, 2005 7:31 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Windup in cascade configuration
Hi folks,
=20
I have some questions about the cascade configuration of two PID =
blocks. In
case of clamping in the secondary block, what happens with the output =
of the
primary block?
For example, if the secondary block clamps at 50% output, I think that =
the
primary block should not keep integrating because in this a windup can =
occur
at its output.
If I am right, the anti-windup works when the BCALCO of the secondary =
block
goes to the FBK and BCALCI of the primary block. Do I need anything =
else to
prevent windup?
=20
Thanks in advance,
=20
Ignacio Queirolo Olivera
Control Avanzado
Complejo Industrial Ensenada
Repsol YPF - Qu=EDmica
Tel.: 54 221 429-8400 ext. 26481
Fax: 54 221 429-8400 ext. 26209
iqueiroloo@xxxxxxxxxxxxx <mailto:iqueiroloo@xxxxxxxxxxxxx>=20
=20
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