Re: [foxboro] NONLOP function

Hi Jaime,
We use PIDX with NONLOP for controlling generator frequency. The block
runs at 50mS to get the required response time for this application. The
block is configured for Prop action only with a high gain once outside
the LZONE/HZONE region. The KZONE is set to zero, effectively making
this a "dead zone controller" with no action as long as the error stays
in the HZONE/LZONE region. There are multiple generators, and the
operators can select dead-band for the frequency control to be IN or
OUT. Selecting dead band OUT will close the HZONE/LZONE values to
0.0001, so any small variation in frequency will make the high gain
controller work aggressively. Selecting dead band IN will open the
HZONE/LZONE values up, so small variation in frequency will mean the
controller will remain in the HZONE/LZONE area with no gain, so no
response. In our case, the value of HZONE/LZONE with dead band OUT
varies between generators so that they will not all respond at the same
instance to a system frequency excursion.


Regards,

Richard Harris
Foxboro Site Systems Engineer=20
NRG Gladstone Operating Services
Tel:   07-4976 5419   Fax:  07-4976 5100
Mobile: 0409 164344
Email: rharris@xxxxxxxxxxxxx
           richard.harris@xxxxxxxxxxxx




-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Jaime Claramunt R. (Inforsa)
Sent: Thursday, 20 January 2005 12:25 AM
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 ?=20

Thx
Jaime Claramunt
INFORSA paper mill
=20
=20
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