RE: multiple vax 6000's free to a good home

["Robert Schaefer" <rschaefe%gcfn.org@localhost>]

The long and short of it is to connect two of the three 208-volt legs to
240-volt single phase, and tape off/insulate the third. This does work,
first-hand experience. I actually did it in the plug itself (replaced it
with the proper one at the same time) to make it even simpler to undo if I
ever happen to get a three-phase service into my basement. ^_^

-- 
Bob 


> -----Original Message-----
> From: port-vax-owner%NetBSD.org@localhost 
> [mailto:port-vax-owner%NetBSD.org@localhost] On
> Behalf Of Isildur
> Sent: Saturday, May 28, 2011 4:41 PM
> To: John Allain
> Cc: port-vax%NetBSD.org@localhost
> Subject: Re: multiple vax 6000's free to a good home
> 
> 
> hey,
> so, one guy alreacy claimed them both, but he might share :), maybe
> you could work it out with him.. regarding a url or anything, sorry,
> i dont know of such a url. i remember that gunther schadow once gave a
> pretty good description of it (along with his vax 11/780 anatomy), check
> the archives of the list, would have been at least 6 or 7 years ago. he
> might be the guy youre thinking of. It should be _reasonably_ simple
> by what anecdotes i have heard, if you have 220v single phase, to
> connect
> it to one set of poles on the big 3phase xformer.
> the primary power bus is 300VDC (yes, 300!)..
> 
> anyhow, as i mentioned the machines are currently spoken for, but if
> that changes ill let you know. (yes, someone else from port-vax beat you
> to it :-)
> 
> isildur
> 
> >
> > Hi,
> >  My take would be a maximum of One, however
> >  I'm not an EE.  Can you reccomend a URL to instructions
> >  to convert the power supply?  I've heard of at least one person
> >  who has done such a conversion, possibly to their 240/normal
> >  phase circuit.
> > John Allain
> >
> >
> > ----- Original Message ----- From: "Lord Isildur"
> <mrfusion%vaxpower.org@localhost>
> > To: <port-vax%netbsd.org@localhost>
> > Sent: Friday, March 11, 2011 6:30 PM
> > Subject: multiple vax 6000's free to a good home
> >
> >
> >> greetings all,
> >>
> >> a contact at the pittsburgh supercomputing center passed word to me
> that
> >> they are about to junk several vax6000's. They were recently running,
> >> but have apparently something funny with the main power supplies.
> This
> >> part comes to me secondhand so i dont know if the 'something funny'
> is
> >> that they take 3-phase ;)
> >> i just asked to get some more details about them, ill post more when
> i
> >> learn. The machines are located in pittsburgh, pa, and i would assume
> >> that there is a loading dock and moving the machines out of the
> building
> >> should be pretty easy.
> >> anyone interested, please get in touch with me!
> >>
> >> happy hacking,
> >> isildur
> >>
> >
> >