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    User name A. Tobias

    Log entry time 18:37:00 on October30,2010

    Entry number 337643

    Followups:

    keyword=CryoTarget Fans

    Dave just came thru here and we asked him about why the Fan speed for Loop 2 was only 49Hz when the set Fan Freq = 25%. He looked at the current the fan was drawing and believes 4.8 to 4.9 Amps seems high (might indicate fan might be burning out).

    Also, I noticed the Loop 1 Fan.adl window was not showing any feedback values for fan voltage or current and other stuff. Dave tested it by changing the fan speed. We did get some readback, but then lost it at some point and could not change the fan speed anymore. Right now the Loop 1 Fan speed is 48 Hz. Dave opened the JT valve a little to help keep the LD2 cool, from 17% to about 23%.

    Right now Loop 1 Fan speed should not be a problem, but Dave said we should reboot the target IOC when we are not taking beam. If we do this, check and see if Loop 2 Fan speed recovers to 60Hz.