I live in northeastern Indiana and about 15 years ago when we moved here (in the country) the power would go out briefly every day in the summer when they switched lines or something.
So at that point an investment in 3 UPS systems made our PCs last longer than 1 year.. hard drives just didn't live very long. Fortunately they put a new substation about a mile down the road and now everyone loses power before we do.. When we lose power, the entire top 1/3 of the county is blacked out. That has happened only once in 6 years. The UPS systems are no longer used or needed. Having a stable AC power source is really nice. :-) Dave On 8/4/2010 11:41 AM, Don Stanley wrote: > Hi Gene: > I considered saying the Sum of the 3 phase currents is zero, except for > harmonic distortion and voltage difference, I decided not to complicate the > message. > > On Sat, Jul 31, 2010 at 12:28 PM, Gene Heskett<[email protected]>wrote: > > >> that 3 phase 440 hz drive to the >> headwheel motors was actually 3 separate oscillators whose feedback to >> maintain the phase angles between them was mixed with the detected time >> base errors in order to speed up the feedback loop and make it stable, each >> oscillator then seeing the applied error in real time. >> >> > Having watched the world of electronics got from all analog to all digital. > I am curious where these drives were in the transition. Do you remember > the basics of the circuit to synchronize the phases? No big deal, just > curious. > > Here in Weston, WV, we have > >> one of those ma& pa ancient mary (AM) radio stations that does an >> excellent job of keeping us up to date on such goings on. >> >> > I also live on a single feed thirty miles off the power grid in South West > VA. > We usually get 17.5 flickers before the outage. I run the system computer > and > electronics through a UPS and hope the joint following errors shut the > system > off before damage. The spindle and axis servo are direct to the AC power > with > linear power supplies; which can maintain voltage through small flickers. > The shop radio tells me when flickers start (snicker). > > Thanks > Don > > > >> -- >> Cheers, Gene >> "There are four boxes to be used in defense of liberty: >> soap, ballot, jury, and ammo. Please use in that order." >> -Ed Howdershelt (Author) >> You two ought to be more careful--your love could drag on for years and >> years. >> >> >> ------------------------------------------------------------------------------ >> The Palm PDK Hot Apps Program offers developers who use the >> Plug-In Development Kit to bring their C/C++ apps to Palm for a share >> of $1 Million in cash or HP Products. Visit us here for more details: >> http://p.sf.net/sfu/dev2dev-palm >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> > ------------------------------------------------------------------------------ > The Palm PDK Hot Apps Program offers developers who use the > Plug-In Development Kit to bring their C/C++ apps to Palm for a share > of $1 Million in cash or HP Products. Visit us here for more details: > http://p.sf.net/sfu/dev2dev-palm > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
