Ferroresonant transformers and 3278

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 <tmfdmike at 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.'