Yes Walt, it has anti-friction bearings which were replaced during refurbishment.
The same signature was obtained on rigid base plate, both in the work shop as well as at site.
Several readings were taken by several people at several locations on the motor with the same result, ruling out...
We collected some vibration readings on a solorun of a 450 KW 50Hz 2 pole 3 phase refurbished AC Electric Motor with a magnetic Accelerometer, and found the following spectra.
Mutiples of running speed 2996cpm up to 5x with side bands on all the multiples of 225cpm. At first we suspected cracked...
