WP11314 Ramped CP1 fill

Gerardo, Richard, Travis, Jordan, Dave:

My code change was not ready for today's 10:00 fill, so we did one at the old time of 13:15.

Gerardo confirmed this was a good fill curbside.

New code summary:

Opening the LLCV is now ramped over 5 minutes

Closing is still as fast as the valve can move.

The code change details:

New PV added to IOC: H1:VAC-CP1_OVERFILL_LLCV_RAMP_TIME_SECONDS

The YAML configuration file parser now reads a new llcv_ramp_time_seconds line (default is 0)

At time of fill, instead of setting the LLCV to MAX_VAL as part of the pre-fill, it now overwrites the starting value to test caput is working.

In the fill loop, if the run_time is within the ramp_time, the LLCV is ramped to the next value.

If ramp time=0, the LLCV is set to the MAX_VAL in one caput, identical to pre-ramp code.

If during the ramping an end-of-fill condition is detected (cancel, fill-completed, TC failure, discharge line pressure out-of-bounds) the fill is stopped and LLCV returned to starting position.

Note that opening the LLCV is ramped, but closing it back to the starting value is still done with a single write (prevents excessive LN2 loss when overflowing).

Attached trends show both the standard logarithmic version, and a linear one zoomed in to show the new ramp