If I understand it correctly, the units for INT change to gain/minute in
integral-only control. Therefore if you would like a gain of 0.2 to be
repeated every 4 minutes, you would set INT to 0.05.
I derived this from the following (from the block book):
In PI mode, the PID algorithm uses series:
OUT = [100/(PBAND INT s)] [(SPLLAG INT s+1) SPT - (INT s+1) MEAS]
In I-only, the PID algorithm is as follows:
OUT = [1/(INT s)] [SPT-MEAS]
Regards,
Jason
____
Jason Wright
Regional Technical Specialist
ControlSoft, Inc.
(216) 397-3900 x201
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of JOHN E
ZIEGLER
Sent: Wednesday, August 22, 2001 10:32 AM
To: [EMAIL PROTECTED]
Subject: PIDA Blocks with I-only Control
Could some provide some insight into using a PIDA block with I-only
control? Or a Foxboro reference for this information?
My big question is how do you set the gain? Also, I would appreciate
any other configuration tips people might have.
Thank you for assistance.
Jack Ziegler
Sunoco Chemicals
Frankford Phenol Plant
215-537-2455
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