Not positive, but I’d suspect resonant frequencies.. might be simple as using flat washers under the mounting screws.. maybe try adding an inductive load to skew the power factor.. gobs of information online.. good luck. db
Sent from my iPhone > On Jan 31, 2022, at 10:34 AM, drake.chamber...@redwoodalliance.org wrote: > > > An Outback X-240 auto transformer on a VFX3648 buzzes loudly with a load of > 400 W. The sound diminishes and finally stops with higher loads. > > The load was an electric, oil filled space heater. > > Has anyone seen this before? > > Thank you, > > Drake > > Drake Chamberlin > Athens Electric LLC > Ohio Electrical Contractor’s License 44810 > CO Master Electrician’s License 4526 > NABCEP Certified PV Installation Professional > > -- > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
