For those of use who might have a broad, but more generic technical knowledge - could you please explain exactly what a "3278" is?
Sincere query.. as the goog turns up nothing meaningful.. On Mon, Dec 21, 2015 at 9:03 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.' >
