Siemens 680 User Manual download pdf (Page 36)

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Vibration Analysis Sheet

Pick-Up Filter-Out Coupled Filter-In Coupled

Disp. Freq* Vel. Freq.* Vel. Freq. Vel. Freq. Vel. Freq. Vel. Freq.

Point

Position

Mils CPM In/Sec CPM Mils CPM Mils CPM Mils CPM Mils CPM

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

Horizontal

Vertical

Axial

*Dominant Frequency

Before vibration difficulties are reported, accurate vibration readings should be taken and consideration given to the following:

1) How does vibration level at center line of motor

compare to that at motor feet and foundation?

5) Does vibration level change when mounting bolts are loosened

one at a time? Do feet distort when bolts are loosened?

2) Is motor on a fabricated base or grouted in concrete?

3) When power is cut, does the vibration decay

immediately or does it gradually die away?

4) Is there a large shim pack under motor feet?

6) Is motor for coupled or belt-drive use? Is a coupling used on a

long shaft motor? If so, how long is the key and what is the

length of the coupling?

7) Is there a resonant condition in the system which can be

checked by a hammer test?

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Siemens 680 User Manual Page 36

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