[Dsg-rtpc] Purge/Fill Issues

[Brian Eng]

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.