No, AC motors don’t work that way. Though you have the right idea, it’s just called a variable frequency drive. Rectify the AC into DC, stick it in a big capacitor, and turn it back into AC at whatever frequency you want the motor to spin at. Slowly ramp up the speed and it takes a lot less energy, at least in a pumping application. Or really any application where starting the load moving doesn’t require a lot of breakaway torque.
Mark > On Jun 3, 2021, at 10:28 PM, Steve Jones <[email protected]> wrote: > > I assume you cant just put a massive capacitor on it? > > On Thu, Jun 3, 2021 at 7:14 PM Jaime Solorza <[email protected] > <mailto:[email protected]>> wrote: > Exactly...that's what they messed with it. > > On Thu, Jun 3, 2021, 5:56 PM Chuck McCown via AF <[email protected] > <mailto:[email protected]>> wrote: > Systems I worked on like this had an alternator circuit that would make two > main pumps take turns each operation. > > I also worked on remote C.O. buildings that had dual HVAC systems. After a > power failure the generator would come on but it could not start both systems > at the same time. I had to put a cut out on one of the HVAC systems to kill > it if there was a commercial power outage. > > Unless you work with large motors, you have no appreciation for starting > loads. > > From: Jaime Solorza <> > Sent: Thursday, June 3, 2021 5:02 PM > To: AnimalFarm Microwave Users Group <> > Subject: [AFMUG] Fort Bliss lift station troubleshooting > > After going through the drawings and consulting with original design engineer > on this project installed in 2007, we found one issue right away...the water > company techs made some changes to try to get pump 3 and 4 to run > simultaneously...kept tripping breaker. > The system was designed for 600amps maximum but when pump 3 starts up it goes > above 600, drops and stays at around 204.x while working, then when they turn > pump 4, it starts up above 600amps and trips breaker. > The system was designed to work with pump 1, a smaller motor and pump 3 , and > pump 2, same as 1, works with pump 4. > On Monday, we will rewire to original design and make some changes to PLC > programming and relays....they need some better level transmitter installed > but that's another project. > BTW, the enclosure is water tight and under a canopy for added protection. > > > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > -- > AF mailing list > [email protected] <mailto:[email protected]> > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > <http://af.afmug.com/mailman/listinfo/af_af.afmug.com> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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