IMC-2008 23rd International Maintenance Conference - Dec 8-11 - Hyatt Coconut Point Bonita Springs Florida Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About vibration/alignment/balance dB down motor induction change (increased)
Join or Manage Your Profile Posting Boards Machinery Condition Monitoring and Predictive Maintenance Posts About vibration/alignment/balance dB down motor induction change (increased)|
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I have problem, induction motor last measured 28 dB down, when i am checked now db increase above 41 dB ( measure with CSI 2120 by clamp current)
Motor data : 3,3KV, 500KW, 1485, 90Amp rpm motor run parellel with some motor (any 2 motor run for drum barker) but current not same & diffrent above 15 amp MCSA......is new revolution on electrical |
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28db down pole pass sidebands are a bad symtpom.
If the loading were less in the second test, that could explain why the sideband magnitude went down (db difference went up). You should have load data available. If nothing else you can extract it from the magnitude of the line frequency peak in your sepctrum. |
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