Friends, I've exhausted the Bergey tech support expertise on this issue and I'm hoping someone on the list may have a solution to share. I have a customer with an older XL.1 on a tilt-up tower. The machine has been in place since 2007. I've done some work to it over the years including blades, yaw bearings, painting, slip rings, brushes, rectifier. The machine/property has a new owner who finds the noise of the machine to be objectionable. The original owner also noted the noise, but was not as dogged about resolving it. The noise is best described as a "hummbuzzz" and it happens when the machine rpms have slackened and then begin to accelerate again. The transition causes some kind of electrical harmonic that is not noticeable once the rpms increase. So, if the machine furls out of a high wind and the rpms drop then the noise begins as soon as it un-furls and the blades begin to accelerate. The noise disappears as it comes up to speed. This noise does not happen if the machine is allowed to run unloaded (with the breaker in the off position).
Anyway, I'd sure appreciate any thoughts. Many thanks in advance! -- Matt Sherald PIMBY Energy, LLC NABCEP Certified Solar PV Installer® 304-704-5943 www.getpimby.blogspot.com www.getpimby.com
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