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  1. #66
    Join Date
    Aug 2009
    Location
    Taiwan
    Posts
    63
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    Sure, just wait for a couple of days,
    Have to say thanks for your concern and the good suggestions.

  2. #67
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,851
    Post Likes
    Quote Originally Posted by Taicool View Post
    ...2. measure the motor vibration, the result is as attached,...
    was the vibration data taken with the motor connected to the compressor? if so, at what loading/RLA?

    the best open rotor test using vibration equipment is by measuring the dB of the current...see attached.

    the main peak in the middle is the line frequency (60 Hz) and the large peak to the left is the rotor turning speed (57.469 Hz). the difference is about 32 dB. anything less than 45 dB indicates the beginning of a problem...<30 dB means that the motor is going to try to walk out of the door!
    Attached Files Attached Files
    Have you ever noticed that geese walk around like they are drunk and trying not to get a public intox ticket?

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