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    User name jpchen

    Log entry time 16:47:30 on February28,2001

    Entry number 57184

    keyword=Guideline for change LH2/LD2 fan frequency

    Guideline for changing fan frequency (for target operator):
    1) For LH2 loop:
    When change from 10% to 25% or change back from 25% to 10%, please take steps
    of 5%. After each step, wait for heat load to stablize then proceed to next step.
    At the beginning and close to the end, smaller step will be a good idea. Use the
    heat power change as an indicate (if the power change is abnormally high, say more
    than 30 watts for 5% change, then you need to slow down. If not sure, call the
    cryotarget-on-call).
    2) For LD2 loop,
    When change from 10% to 15%, take steps of 2%, 2% and 1%.
    When change back from 15% to 10%, take 2% then 3%.