I took measurement for separator of raw mill at cement plant.
No fault was detected at motor, gearbox. But at NDE bearing of separator shaft appears impact/revolution (in transverse direction), separator speed is 119.5 rpm, DE bearing is normal. The data collected at NDE bearing when there is no load.
A symtom when loada (feed material) is current of motor is sometimes high (normal is 50A, sometimes is 110A).
Please leave comment if you got this case before!