Have a 3000 RPM, 2 pole motor with following vibration spectra in decoupled condition. Both motor DE and NDE have high 1X vibrations in all H/V/A axes in decoupled state. The motor was running fine in coupled condition (a compressor) until it started showing high vibrations. Then the motor was decoupled and test run again with following vibrations. Any idea what could be the reason for these high 1X vibrations (and 2X in MDE - A)?
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