Hello gentlemen, I have another solution for the power supply problem: move to Europe! In our village (270 some people) we have two transformer stations on a grid-connected 20 kV three-phase line. The power lines go to (or come from) three neighboring villages and eventually end up at the region's 110 kV-transformer station about 20 km away.
Our house has a 400V, 50 A, 3-phase supply as all the houses do, this is average. All the cabling is under the roads under ground, in our street a PVC cable 3x75 mm sq. + 50 mm sq.for the middle conductor (implicit ground). This is standard für all single houses, a corresponding bit more for larger ones. I have experienced one or two power failures since we live here (32 years). In a larger city like Munich, for instance, 50 km from us, power failures are completely unknown. I have experienced one when I was a little boy. Sometimes we have short power drops when lighning hit the power line, but only for a few sine periods, so most PC's and other appliances don't even recognize it. America should improve their energy supply! By the way: I have learned electricity, house wiring and TV repair at high school in Michigan some 45 years ago and know what the difference ist! Peter Blodow Przemek Klosowski schrieb: > On Wed, Nov 24, 2010 at 1:11 PM, Jim Fleig <j...@cncservices.ws> wrote: > >> Hello All, >> >> Happy Thanksgiving one day early! >> >> To protect sensitive electronics in machine tool controls (and many >> other places) put an UPS (Uninterruptible Power Supply) between the >> power source and the sensitive electronics. Most DC power supplies >> are converting 110 VAC to whatever DC voltages are needed. The UPS >> unit is easy to put into the circuit and for most machine tool >> controls will cost about $150.00. >> > > Absolutely, but the price goes up tremendously with power. I am now > pricing an 80kW system and it seems to be 70k$ (about half of it is > the batteries for 30 min uptime so some of the price could be cut). > Come to think about it, the rule of thumb seems to be 1k$ per 1kW > > I suppose a CNC system could use a simple power conditioner for the > power feed to the motors and the UPS for the electronics/controller, > but that does not guarantee against power surge getting into the power > stage and flowing back into the controls. > > ------------------------------------------------------------------------------ > Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! > Tap into the largest installed PC base & get more eyes on your game by > optimizing for Intel(R) Graphics Technology. Get started today with the > Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. > http://p.sf.net/sfu/intelisp-dev2dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
