Vibration Analysis Sheet - Siemens 880 Installation Operation & Maintenance

Vibration Analysis Sheet

Pick-Up
Disp.
Point
Position Mils
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?
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?
Filter-Out Coupled
Freq* Vel. Freq.*
CPM In/Sec CPM
Vel. Freq. Vel.
Mils CPM Mils
5) Does vibration level change when mounting bolts are loosened
one at a time? Do feet distort when bolts are loosened?
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?
- 30 -
Filter-In Coupled
Freq. Vel. Freq.
CPM Mils CPM
Vel. Freq.
Mils CPM