Reply to "1250 Hp. Reliance motor oscillating while running"

Always difficult to analyse without any spectra and detailed info but I suspect this noise frequency is somehow related with the gearbox output rotation. Check it. If so, you could have some output shaft issues (eccentricity, damaged bearing, something is breaking the conveyor, belt is oscilating etc...). This unconstant load could lead to some VFD issues or mechanical issues. For detailed source you should measure and attach as much vibration data as possible.

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