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    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.