Didn’t all the IBM mainframes use 400hz? Maybe ask the IBMers how they got 400hz. Also, can the local power company supply it?
Sent from my iPhone > On Oct 12, 2024, at 14:03, Nigel Johnson Ham via cctalk > <cctalk@classiccmp.org> wrote: > > Hmm, I think the 40 years has expired, so I can tell the story of the MG at > NATO HQ... It had a two-ton flywheel, and a standby generator off a side > shaft that kicked in if commercial AC failed. Problem was, the building was > wired with incorrect phase colouring, so when they installed it all the > motors went backwards! U-Thant got in an elevator for an upper floor and > went down and hit the stops! > > >> On 2024-10-12 15:47, Chuck Guzis via cctalk wrote: >> On 10/12/24 11:54, Brent Hilpert via cctalk wrote: >> . >>>> Another approach would be to substitute the old psu by modern ones, >>>> possibly by DC-DC converters or switching powersupplies. >>>> >>>> Does someone have experience in the substitution of psus in the multiple >>>> KW range or did this in the past? >> I recall that one of the benefits of using an MG set (probably better >> referred to as a rotary converter, or motor-alternator set) is the >> ability to float though short term power glitches. >> >> I remember summer employment at a drive-in movie theater during my >> summers working as a projectionist. Power supply for the DC carbon arc >> lamps was supplied by a 40 Hp MG set located in its own building. Such >> things do generate a fair amount of noise. >> >> Does this date me? >> >> --Chuck >> >> > -- > Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU > Amateur Radio, the origin of the open-source concept! > Skype: TILBURY2591 >
