We have overhung centrifugal blowers (Fan: backward curved) equipped in our plant. Centrifugal blowers are with arrangement 4 & 8. Some are of 2900 rpm and other 1450 rpm. I will appreciate your help in following query: Is it possible to determine exact source of imbalance in centrifugal fans. In frequency spectrum analysis how we could find and differentiate the imbalance is due to :
1. Fan unbalance or
2. Motor bearing fit loose in housing or
3. Fan hub loose fit on shaft
I will appreciate your support in this regard.