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From: esf00@amdahl.amdahl.com (Elliott S. Frank)
Newsgroups: comp.misc
Subject: Re: IBM mainframe for sale (Really 400/416 Hz power for Crays)
Message-ID: <15826@amdahl.amdahl.com>
Date: Thu, 8-Oct-87 12:57:03 EDT
Article-I.D.: amdahl.15826
Posted: Thu Oct  8 12:57:03 1987
Date-Received: Sun, 11-Oct-87 03:42:38 EDT
References: <4673@nsc.nsc.com> <2944@phri.UUCP> <365@nuchat.UUCP> <2952@phri.UUCP> <2075@kitty.UUCP>
Reply-To: esf00@amdahl.amdahl.com (Elliott S. Frank)
Organization: The Beige Building Full of Bright Engineers, Inc.
Lines: 21

In article <2075@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>
>	I too, am puzzled as to why Cray would use an M-G set and 400 Hz
>power supplies. [...]  Since solid-state 60->400 Hz inverters are readily
>available and more efficient than M-G sets (such inverters have great
>application in aircraft ground support), I am puzzled why an M-G set
>would be used.

It's up to the customer's Computer Center (or Facilities Department, or
Purchasing Department).  The Cray machine (like an Amdahl 5890) requires
415 Hz power (yes, three phase).  How the customer elects to provide that
power is up to him.  Computer Decisions magazine is full of ads from
vendors providing all sorts of systems that supply the right amount of
415Hz 3-phase power for Amdahls, Crays, CDC's, and IBM's.
-- 
Elliott Frank      ...!{hplabs,ames,sun}!amdahl!esf00     (408) 746-6384
               or ....!{bnrmtv,drivax,hoptoad}!amdahl!esf00

[the above opinions are strictly mine, if anyone's.]
[the above signature may or may not be repeated, depending upon some
inscrutable property of the mailer-of-the-week.]