Kirk Wallace schrieb: > I'm looking forward to see how this story ends. >
Gentlemen, as I mentioned before, telling from the (for me) amazingly immense response to this topic (which actually has nothing to do with emc2), I see a tremendous need for decent power supply in the US, probably especially on the countryside. I mailed to this list about a year ago that here in Germany (and in most of Europe), every house, new built or less than 30 to 40 years old, has a 3 phase electric supply with at least 3 x 50 amps main fuse and at least 3 x 35 amps selective fuse per inhabitant family in front of the measuring device. That means a capability of some 50 kW three phase per house. You can't have it any else, not even if you try, it's in the basic conditions of the suppliers. If you apply for a building license at the local administration to erect a new house you can't help getting at least this type of electric supply line just like public water supply and sewage disposal. So, I never had any problem running large motors like e.g. my 10 kW circular saw for firewood cutting, welding equipment etc. For household purposes, the three 400 V phases are usually split into three 230 V, 16 amps circuits, each one leg grounded, after the electric counter. This has the benefit that upon failure of one or two phases, there will be no complete black-out in the house. Even small appartments have more than one phase supply to benefit from this black out protection. Without this stable infrastructure, the booming solar panels on very many houses couldn't feed their energy into the public supply net. I think it would be worth wile to build up a powerful lobby in the US to enforce decent power supply for everyone - what a shame for the most powerful and most technically oriented country in the world to discuss about how to get motors and machines running! Why not write letters to your representatives instead of discussing weird solutions with lots of condensers, inductors, VFD's and so on if there are very simple, straightforward methods to power a machine? In virtually every country in the world electrical power is produced, transported and distributed as three-phase-current, also in the US, because this is the most efficient way. Why not down to the very customer? Exert pressure on those representatives and your suppling companies! VFD's should only be used when varying frequency is desired and to convert single phase to three phase current on a low level base, say below 1 kW, if a three phase supply doesn't seem economical. That's what they are made for. Analyzing costs, a decent three phase power supply line must be cheaper and much more reliable than a VFD. 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
