Need some input on this one. The application is a belt driven vacuum pump (paper mill.

Attached are a couple of spectrals (g's & g/SE) for a brand new motor - Seimens 125HP - 6 Pole -460V - 445T - TEFC. Brg's OSE 316 - SE NU318 The motor control is an electronic RVS.

The acceleration spectrum 360Kcpm Fmax displays harmonics of MTR-RPBF along with 2LF sidebands. The fourth harmonic has the greatest amplitude.

The g/SE (Entek Spike Energy) spectrum displays an elevated frequency peak at 2x's BPOR-1 (7240)although BPOR-1 and it harmonics along with BSF-1 is also evident. 2LF is also evident.

BPOR-1 & BSF-1 are evident in the velocity trends although at very low levels (<0.02 in/s).

Input, thoughts, idea's, questions greatfully accepted!

21PMP2201_2008-08-15.doc (64 Kb, 55 downloads)

Any way to make the doc larger? I can read it. Too small.

hi Ralph, try view, then zoom

quote:

Originally posted by Ralph Stewart:
Any way to make the doc larger? I can read it. Too small.

Steward
MAKE IT 150% IN MS Word.
Irshad

This message has been edited. Last edited by: AKHTAR,

Bearing problem may be there with BPFO but rotor bar problem seems remote . There is no evidence of PPF around 1X or 2X or use a higher resolution spectrum. Also 0.5 g is not that high in high frequency range.

I agree, rotor bar problem is unlikely. The confusing "evidence" that 4xRBPF is the largest is affected by units of measurement in g's.
Also at Fmax=6 KHZ and magnetic mounting, mounted resonance could not be exluded.

As far as BPFO is concerned, ensure that resolution allows to differentiate between 7200 CPM and 7240 CPM.