We have a vertical motor driving the condensate pump. It is a 2000KW , 1490 RPM motor. The motor DE and NDE bearing vibration is going high. It is known that the outer race of DE bearing is rotating in the housing. 1X and harmonics say this. In addition, we have frequencies in 450HZ to 600HZ with a number of side bands. Bearing is NU 230. Appears to be bearing defect frequency but none of the peaks in this region is matching with bearing defect frequency or harmonic. The spectrum is attached herewith. Require help for giving a call for bearing replacement.
Also we are having high VPF on pump. Spectrum is attached.
Whats the envelop spectrum said?
The envelope of motor DE and NDE is attached. Looks like bearing defect frequency but does not match the defect frequencies or harmonics.
Is the attached vibration reading for motor solo run or is it on load reading?
It is on load running. 1X and harmonics may be due to rotating looseness but what about 450 HZ- 600 HZ range peaks with 1X side bands. Is it natural frequency of bearing with side bands.