Jon Elson schrieb: > I think what he is trying to do is move the scope common the the > center-tap point of the motor. > I just wrote a notice on this to the list describing what to do. > When using a 2-phase to 3-phase converter, the motor's center point is > NOT at ground potential. > This is highly dangerous. Never let a motor float electrically! It's wire insulation could be stressed with any voltage to ground, e.g., if the high potential DC circuit insulation fails! > This is also true when using several of the unbalanced 3-phase supply > systems available in the US, such as corner-grounded and center-grounded open > delta supplies. > Center grounded sounds not so bad. Corner grounded is less economical, but acceptable from a supplier's point of view. For measuring it's less favourable...
I remember two rules from my electricity course at Muskegon, Mich. High School: Ground everything you can get a hold of and always leave one hand in your pocket! Peter Blodow ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
