Got a page from Don Flemming at about 18:50 wondering why the power
lead temperatures were rising. See attachment may5_04_1800.BMP It looked as
though the monitoring signals flat lined for about 2 hours for some reason.
Anyway the powerlead temps were definitely rising. When I arrived HIC142
was wide open but both power lead flows were down to 65 (on the scale) and
the flowmeter float was vibrating rapidly. LHe heater at 33 %. Buffer
pressure at 10 psig. LIC108 at 54 %. CV147 at 0.45 (HIC141). CV141 at 0.6
TCI121 in auto mode.
Closed HIC142 then opened again. Powerlead temps dropped. Opened CV147
from 0.45 to 0.35 (HIC141) Played with setting of set point of TIC121 and
HIC141 to try to increase excess liquefaction. Reduced shield heat to about
16%. Difficult to say what is going on with powerleads. Temps had dropped to
good levels but now gradually rising, but very slowly. Hopefully they peak
and level off. Energized solenoid. Cycled HIC142 a few times but temps
would not trend downwards. Leaving it overnight. Doug, please check and
adjust the system as required in the morning. |