User name jpchen
Log entry time 11:18:16 on October24,2002
Entry number 88946
This entry is a followup to: 88870
keyword=Cryotarget fan problem fixed by target group, back to 60 Hz
Just to clarify: Mike Seely informed me that the fan problem was because the
differential pressure gauge bypass valve was stuck open. The valve connects
the target gas supply and return, which usually only opens during cool-down
and is always closed during normal operation. It's openning 'shorts
out' the fan. The valve is now closed and the fan is back to working normally.
Fan frequency is back to 60Hz after the problem was fixed during yesterday's controlled access.