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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Rotary phase converter versus trying to run a VMC straight from single phase
"Ignoramus3024" wrote in message ... On 2008-02-21, Jeffrey Lebowski Nope@nono wrote: "Ignoramus3024" wrote in message ... My own answer to the "motor too big, need easy starting" problem was to use two idlers, to be started in sequence. Mine are 10 and 7.5 HP. http://www.gromax-usa.com/supplies/c...r/parallel.gif Yes. Mine was slightly more clever than this. 1) I used two contactors instead of 3. Which worked well, they just needed to be wired differently. 2) The first motor had a capacitor on legs 1-3. It assisted with starting, but resulted in unbalanced 3 phase. 3) The second motor had a capacitor between legs 2-3. When it was connected to the network, the capacitors became equal between legs 1-3 and 2-3. That resulted in a much more balanced 3 phase. But mine is better than yours because if the incoming supply power drops out then it kills them all and i have 400 amps feeding the ****ing buss so nanaanananna. Bye bye followups set crossposting removed. -- |
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