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3 phase issue
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<blockquote data-quote="apprentice87" data-source="post: 472139" data-attributes="member: 13534"><p>I built one once!! It worker amazingly well to be honest!! Voltage between phases was correct within a few volts and motors ran beautifully. I had a 7.5 hp motor as an idler..</p><p></p><p>The motors i wanted to run were not dual voltage ones either. So where did i get the right voltage?? Ha, what i did, is i got a 110v power tool transformer, and i reconnected it so as to put the secondary in series with the primary so it would act as an autotransformer. This meant that instead of dropping the mains 230 down to 110, it added the 110 on top to give me 340v. A bit low, and i wondered if contactors would hold in, but they did and it worked great..</p><p></p><p>Took me weeks of sitting on the bog to "invent" a means of getting a suitable voltage!!! i did try running the tool transformer backwards in an attempt to get 460V, btu as soon as i turned it one the fuse blew. No idea why though, as i know that in theory at least a transformer will run backwards after a fashion..</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 472139, member: 13534"] I built one once!! It worker amazingly well to be honest!! Voltage between phases was correct within a few volts and motors ran beautifully. I had a 7.5 hp motor as an idler.. The motors i wanted to run were not dual voltage ones either. So where did i get the right voltage?? Ha, what i did, is i got a 110v power tool transformer, and i reconnected it so as to put the secondary in series with the primary so it would act as an autotransformer. This meant that instead of dropping the mains 230 down to 110, it added the 110 on top to give me 340v. A bit low, and i wondered if contactors would hold in, but they did and it worked great.. Took me weeks of sitting on the bog to "invent" a means of getting a suitable voltage!!! i did try running the tool transformer backwards in an attempt to get 460V, btu as soon as i turned it one the fuse blew. No idea why though, as i know that in theory at least a transformer will run backwards after a fashion.. john.. [/QUOTE]
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