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RAJ KUMAR
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Join Date: Aug 2008
Posts: 56

Loop

04/29/2009 5:29 AM

can any body tell me the working of the attached loop.
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naveen_menon
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India - Member - Naveen Menon Engineering Fields - Instrumentation Engineering - Naveen Menon

Join Date: Oct 2007
Location: India
Posts: 92
Good Answers: 2
#1

Re: Loop

04/29/2009 6:02 AM

Whats the NOte3

anyways seems like there are 3 controllers used for one valve

they are FIC ,TIC & PIC

FIC Flow controler

PIC Pressure controler

TIC Temperature controler.
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craigza
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South Africa - Member -

Join Date: Nov 2008
Location: Johannesburg
Posts: 295
Good Answers: 12
#2

Re: Loop

04/29/2009 6:34 AM

Hi there,

The drawing is a bit small. From what I can see.

It looks as if the pressure is cascaded to the temperature. This means that the Temperature loop is the master with the pressure controlling the valve. i.e. The TIC output will give a setpoint to the PIC.

It also looks as if you can use the FIC to control the valve directly if you want to control flow. But from the drawing the FIC would not be cascaded back to the TIC.

Regards,

Craig
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3

Re: Loop

04/29/2009 6:57 AM

There should be a description in a document entitled, "Process Description", or similar.

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find2am
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India - Member - ADIL MOULA Engineering Fields - Instrumentation Engineering - Adil Moula

Join Date: Jun 2008
Location: India
Posts: 95
Good Answers: 1
#4

Re: Loop

04/29/2009 3:49 PM

hi Raj what i see is that the temperature controller is the master and pressure controller is the slave and the special feature of PIC block that it can either select PT as input or FIC block when FIC is selected than it is 3 loop control go through the PIC block function in DCS manual regards adil
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