A 398 KW MV motor that runs a blower fan in a cement plant was showing strange behavior. The vibration equipment indicated vibration amplitudes that became chronic with the passage of time. The maintenance team not knowing what the issue was, ran the motor until the bearings had to be replaced. This happened several times with no remedy or cause for the bearing failures. On a few occasions the motor tripped on start up. Other than the symptoms, there was no known explanation for the repeated failures of this motor. The motor was utilized daily in between repeated bearing changes.

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