[Dsg-rtpc] [EXTERNAL] Re: Purge/Fill Issues

[mhattawy@odu.edu]

Hello Brian,
   I just finished trying "raising the 'Intlk - Prg - Fill Press' to 60 and
the Auto to 59. It takes in total for the 3 cycles and the fill about 24
minutes, which is totally fine.

Thanks Brian.

On Tue, Feb 18, 2020 at 11:47 AM Brian Eng <beng at jlab.org> wrote:

> Regarding the entry at 20:04 in the shift summary:
> https://logbooks.jlab.org/entry/3784528
> And the entry it links to: https://logbooks.jlab.org/entry/3784646
>
> This was caused by the flow through MFC104 interlock when in Auto mode.
> What happened was that the fill pressure was lowered enough that when the
> Purge - Fill cycle was complete and it would go back into Auto mode that
> interlock would be tripped and go into failure mode (which empties the
> target).
>
> There's a few "workarounds" to this:
>
> 1. Raise the 'Intlk - Auto - Max Flow' value to 250 (which will disable
> the interlock) until the purge is completed _AND_ the pressure in the
> target has stabilized in Auto mode after which return it back to its
> nominal value (to re-enable the interlock).
>
> 2. Raise the 'Intlk - Prg - Fill Press' value to be closer to the final
> pressure so that the flow will have already dropped below the flow
> interlock when it switches back to Auto mode. I suspect this will increase
> the purge time which is why it was lowered in the first place.
>
>
>
> Hopefully that explains what was going on.
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-- 
Best regards,
Mohammad Hattawy.
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