[RE-wrenches] Bergey XL.1 HummmBuzzz

[Matt Sherald]

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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