kyle.ryan@LIGO.ORG - posted 11:34, Sunday 14 July 2019 - last comment - 12:58, Sunday 14 July 2019(50526)
Kyle at mid-stations
Continuing logic troubleshooting of new pump installation at Y-mid (no craning, pwr tools, ladders etc.). I will make a comment to this entry when I leave.
Problem fixed! The new HEPTA PUMP intake valve OPEN position indicator had not been "talking" to the control logic following a change to the relay-based logic that I had made on Friday -> It turns out that the changes made to the logic were good all along but that the valve wasn't opening enough to change the state of the OPEN contacts due to low air pressure
(air-to-open/spring to close valve). I increased the air pressure to 60 psi from 40 psi and everything is working. NOTE that the valve's gate was opening at 40 psi but not enough to close the OPEN contacts.
1259 hrs. local -> Leaving site now.