Hmmmm. I do have a massive idler motor - as in it takes two people to even think about lifting it - from my days in NY when I had to manufacture a 3rd phase to make the S/3 and other items work... I wonder if I could do anything using that as a starting point?
Three phase is no problem here... previous owner of house was a woodworker and I have 3-phase 50Hz 400V straight to the workshop already wired in :-) Finagle's law says 90% of my 3-phase big iron was acquired in the USA and expects 3-phase 60Hz 208V... :-( Mike On Tue, Dec 22, 2015 at 4:03 PM, William Donzelli <wdonze...@gmail.com> wrote: > If you can get a rotary one, those are really nice - just wasteful and > loud. With proper maintenance they last forever, can take a beating, > and do not give waveshape issues that cheap solid state units can > have. And, maybe most importantly, you can make one yourself. > > But considering the mix of 50 and 60 Hz stuff you likely have by now > (that is what you get for moving!), spending some decent money on a > real VFD might be worth it. I might think a cheap VFD may give > ferroresonant iron fits with all those extra harmonics. > > -- > Will > > On Mon, Dec 21, 2015 at 9:48 PM, Mike Ross <tmfdm...@gmail.com> wrote: >> Any recommendations for what type? Are solid-state devices up to the >> job these days? I still remember rotary converters... >> >> Mike >> >> On Tue, Dec 22, 2015 at 3:45 PM, William Donzelli <wdonze...@gmail.com> >> wrote: >>> In the long term, you should probably break down and get a good size >>> frequency converter. >>> >>> -- >>> Will >>> >>> On Mon, Dec 21, 2015 at 9:33 PM, Mike Ross <tmfdm...@gmail.com> wrote: >>>> I recently blew up a 3278... it worked ok for a few hours then started >>>> blowing fuses. >>>> >>>> I haven't done any troubleshooting yet but checking the manuals on >>>> Bitsavers tells me my US 3278s have ferroresonant transformers >>>> specified as 120V 60Hz only. This can be expected to cause problems >>>> with 120V 50Hz here in NZ from my knowledge of how ferroresonant >>>> transformers work; I'll get excessive magnetic currents - overheating >>>> - all kinds of nasties. I can wind the voltage down a bit and run them >>>> at 90-100V but that doesn't help much. >>>> >>>> 1. Does anyone in a 50Hz country have any dead/spare 3278s and/or >>>> transformers for them? The IBM part number for the 50Hz 220V are >>>> 8715343 or 4119686. >>>> >>>> 2. I have other equipment where this will be an issue and not so >>>> easily solved. Does anyone have any experience in or recommendations >>>> for frequency conversion equipment? My System/3s for instance all use >>>> 60Hz ferroresonants operating off 208V 3-phase - now voltage can >>>> probably be retapped or easily converted but I still need to make a >>>> lot of 60Hz to run them... >>>> >>>> Thanks >>>> >>>> Mike >>>> >>>> http://www.corestore.org >>>> 'No greater love hath a man than he lay down his life for his brother. >>>> Not for millions, not for glory, not for fame. >>>> For one person, in the dark, where no one will ever know or see.' >> >> >> >> -- >> >> http://www.corestore.org >> 'No greater love hath a man than he lay down his life for his brother. >> Not for millions, not for glory, not for fame. >> For one person, in the dark, where no one will ever know or see.'
