Another thought - with scrap transformer prices in a crapper right now. you might also be able to pick up a really beefy isolation transformer for spare change, in order to clean up a VFD. Generally, normal industrial grade 50 Hz transformers will not care too much if you use them at 60 Hz.
-- Will On Mon, Dec 21, 2015 at 10:45 PM, Mike Ross <tmfdm...@gmail.com> wrote: > 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.'
