Siemens CGZ - Manual (Page 31)

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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?