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Hello all,

I have a case where a 30 KW VFD motor is driving a blower (mounted on the motor shaft; overhung). Following signature obtained when vibration is measured at motor's DE,

Horizontal: overall velocity = about 4.8 mm/s; 1x slightly higher than 2x; no other dominant components
Vertical: overall velocity = about 4.8 mm/s; 1x slightly lower than 2x; no other dominant components
Axial: overall velocity = about 5 mm/s; 1x dominant

What could be the cause ? Bent shaft ?

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