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DVC6200 SIS HART capabilities

Whether Tests like Auto calibration, Step response and valve signature curve be done over HART from AMS (Valve link software). Is there any requirement of minimum current to be supplied from host system to DVC6200 SIS to conduct these test over HART.

We are using DVC6200 SIS for our Shutdown valves, wherein 4mA will close the vale and 20mA will open it.

Can above mentioned test be conducted in shutdown condition i.e. when 4mA is supplied to DVC6200SIS over HART through Valve link software.

Please provide the link if stated anywhere in Emerson document.

aboutmerahul
  • Alex Quah
    Hi Rahul,

    In the DVC6200 HW2 Instruction Manual - D103605X012:

    • For auto-calibration - “The analog input signal to the instrument must be greater than 3.8 mA. Adjust the current output from the control system or the current source to provide at least 4.0 mA.”
    - This shows that with 4.0 mA, the DVC6200 has enough power to allow ValveLink to fully stroke the valve for calibration. This can be applied to step responses tests and valve signatures. As long as the device has 4 mA, it would be able to carry out these functions. However for the Valve Signature and Step Response, there will be a prompt recommending 6.0 mA, this is not a necessity, but a recomendation.

    • For SIS - Partial Stroke Testing- “A partial stroke test can be initiated when the valve is operating at either 4 or 20 mA (point‐to‐point mode).”

    I hope this answers your question.
    The document can be downloaded from our website. Just google - D103605X012.

    Regards,

    Alex
  • aboutmerahul

    In reply to Alex Quah:

    Hi Alex,
    Thanks for the reply. I understood that 4mA is adequate to conduct such test over HART. However may I know the document which recommends 6mA mentioned by you.
  • Riyaz Ali
    Thanks Alex for clarifying the query.
    Rahul to your question as below;

    Can above mentioned test be conducted in shutdown condition i.e. when 4mA is supplied to DVC6200SIS over HART through Valve link software.

    It is true that DVC can make PST at either end but to configure you have to run the set up wizard again and according to IM page 31, table 3-8 configure the position desired.
     
    Hope this helps.
     
    Regards
     
     
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  • aboutmerahul

    In reply to Riyaz Ali:

    Dear Riyaz San,

    Thanks for the reply, I understood the requirement for conducting PST, However I would like to know current recommendation for conducting Auto calibration, Step response and valve signature curve tests through HART. Alex says 6mA is recommended, I would like to know, If this recommendation comes from any document published by Emerson.
  • Alex Quah

    In reply to aboutmerahul:

    Hi Rahul,

    It is a prompt that will come up when doing the test using ValveLink with 4 mA. However, as mentioned, the test will run fine at 4 mA.
    From what I can find, there is no documentation that states this.

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