mån 2020-06-22 klockan 14:05 -0600 skrev Grant Taylor: > On 6/22/20 1:09 PM, William Donzelli wrote: > > Also, if I could post an image to this list, I would show what a > > standard IBM phase rotation sensor looks like. I have a box of > > them. > > > > They are basically just relays with three windings on the core, > > and unless the phases are hooked up properly, they will not throw > > - > > all the magnetic fields have to line up. > > I would be interested in seeing a picture, and more so, a schematic > (block) diagram of how they were wired. > > I can conceptually understand how it should be possible to build > something that would respond with the proper phasing. I just can't > grasp it well enough to white board it. >
3-phase power heating pumps (and other 3-phase compressors) here in Europe usually comes equipped from factory with phase-order relays. IT is very bad running a scroll compressor backwards .... We have a number of utilities who did that error (and when we also have the utility people which loses the return ..... stuff doesn't like being feed 300 V while done for 240.) It normal for houses here in Sweden and a lot of other countries in Europe to have 3-phase with return and protective earth service. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
