John Thornton wrote: > I spent the day swapping out the 15hp idler in the RPC for my 10hp idler > (much quieter by far) and balancing the RPC per the directions in the > Fitch pdf. I did notice that my Vac and Vbc was reversed from his chart > no matter what I tried. In the end I had Vab 244, Vac 252, Vbc 252, Va > 122, Vb 122, Vc 212 with c being the generated leg. > Well, this is a LOT closer to perfect. > http://www.practicalmachinist.com/FitchWConverter.pdf > > I did a test run and it would take a S3000 M3 without an error, above > that it would error out. Then I remembered that I had the taps wrong on > the step up transformer. I changed them from 208 to 240 and it would > error out at S2000. I moved the taps to the 220 lugs but ran out of time > to test it. > Well, you need to have the meter set up and see what happens to the voltages when it is near the tripping point. If the voltages are shifting during spindle start-up, especially the generated leg is sagging, then you may need a bigger idler motor, or possibly the caps need to be optimized for the high-load condition, not the idle condition.
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