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

Join Date: Jun 2008
Location: India
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Positioner DVC2000/6010 Not Positioning at Known Signal

03/13/2018 11:16 AM

We are in a phase of optimization of plant we are given to check calibration of the valves but when we give 0 to 100% we get correct valve to travel but from 100 to 0 percent the travel goes down by 1.5% and takes very long time to come back to require value. Valve sizes are from 6 inch to 10 inch valves.

How this action be faster so as to minimize the error within 0.5% of the span?

I auto calibrate, I put tuning values but result is same.

Can we get some solution to this issue?

Regards

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: positioner dvc2000/6010 not positioning at known signal

03/13/2018 11:40 AM

If these are pneumatically-operated valves it sounds as though the I to P converter driving them is not venting properly, or venting at all.

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Guru

Join Date: Aug 2007
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#3
In reply to #1

Re: positioner dvc2000/6010 not positioning at known signal

03/13/2018 1:41 PM

In addition to the I to P converter, if this is a fail last valve it might have pneumatic snubbers on both sides of the actuator. That would make of the difference between open and close times.

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

Join Date: Jun 2008
Location: India
Posts: 95
Good Answers: 1
#4
In reply to #3

Re: positioner dvc2000/6010 not positioning at known signal

03/13/2018 8:42 PM

These valves are fisher make single acting .

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Guru
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, and now disconnecting ["brexit" - ugh] as Little England and Wales (not too sure about Wales bit, either). Kettle's on.
Posts: 27520
Good Answers: 733
#5
In reply to #4

Re: positioner dvc2000/6010 not positioning at known signal

03/14/2018 4:51 AM

It is somewhat disappointing that this information was not disclosed in the original post, thereby saving the original poster time. It is also disappointing that the outcome of the telephone discussions the original poster has had with the valve manufacturers and the pneumatic system component manufacturers has been withheld from the forum.

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Guru

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#2

Re: Positioner DVC2000/6010 Not Positioning at Known Signal

03/13/2018 1:20 PM

The solution lies with the technical support of the manufacturer. You give NO actionable information.

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