Just wanted to know your opinion on this case. I have detected what could might be a rotor bar issue on a newly installed vertical motor driving a pump. There are peaks and harmonics with sidebands around 2x LF in the spectrum we recently collected. I don't know the no. of bars but from textbook material I believed this is the rotor bar pass frequency. Should I worry? although the amplitude is very low and what are the telltale signs that it's really bad or not.