9 Oct
2007
9 Oct
'07
2:40 p.m.
Greetings all;
I'm reading up on the Onyx (rackmount, original Onyx) and the manual says
that units with three power supplies (OLS') are configured for three
phase, and units with two OLS' are configured for two phase.
While my machine does have the optional lower VME card cage and also the
second SCSI box (thus necessitating the 3 OLS'), I won't be likely to use
either of them. 220v I can do (handy-dandy nearby 40A circuit for a stove)
- 3 phase would require wiring changes in the building.
Is anyone aware if there was an established procedure to go from 3 phase
back to 3 phase on these units? Could I be lucky enough to have someone
here who has done it?
Thanks!
JP Hindin
9 Oct
9 Oct
9:10 p.m.
Does your manual actually use the words "2 phase"?
220v is not 2 phase, although, I can't tell you exactly why. It's been
told to me, that each 110v hot wire of 220v(actually 120v and 240v in
the US) is really the same phase, but inverses of each other, or
something like that. Real 2PH, was used quite a bit in Pennsylvania,
but has been mostly phased out, if not entirely.
This came from various people who collect/restore/use old machinery,
many of whom are engineers.
This may or may not apply, if your outside the US.
Chad Fernandez
Michigan, USA
JP Hindin wrote:
Greetings all;
I'm reading up on the Onyx (rackmount, original Onyx) and the manual says
that units with three power supplies (OLS') are configured for three
phase, and units with two OLS' are configured for two phase.
While my machine does have the optional lower VME card cage and also the
second SCSI box (thus necessitating the 3 OLS'), I won't be likely to use
either of them. 220v I can do (handy-dandy nearby 40A circuit for a stove)
- 3 phase would require wiring changes in the building.
Is anyone aware if there was an established procedure to go from 3 phase
back to 3 phase on these units? Could I be lucky enough to have someone
here who has done it?
Thanks!
JP Hindin
10 Oct
10 Oct
2:22 p.m.
On Wed, 10 Oct 2007, Chad Fernandez wrote:
Does your manual actually use the words "2
phase"?
Indeed it does.
http://techpubs.sgi.com/library/manuals/1000/007-1736-060/pdf/007-1736-060.…
Last paragraph on page 42.
220v is not 2 phase, although, I can't tell you
exactly why. It's been
told to me, that each 110v hot wire of 220v(actually 120v and 240v in
the US) is really the same phase, but inverses of each other, or
something like that. Real 2PH, was used quite a bit in Pennsylvania,
but has been mostly phased out, if not entirely.
You know, I'm just not sure. I can't quite decide. Sometimes it appears as
it 'Two Phase' is a misnomer, as you suggest - but if the units
configuration can apparently be configured for Three-phase just as easily
as 220v "Two phase"... it would seem to me that... oh, heck, I don't
understand enough about this to be sure!
I do recall someone saying that they'd run a 220v unit on a stove outlet,
so I guess US 220v single-phase is what they must run on.
I guess what I'm trying to work out is whether all you do is pop out one
of the OLS' and it'll "just work"... somehow I seriously doubt it, but
there isn't that much electrical wiring in the unit EXCEPT for the OLS' -
so what would you reconfigure?
Alas SGI's techpubs only contain the User Guide and are thin on all other
manuals for the Onyx, that I can find at any rate.
Many thanks to all;
JP
2:36 p.m.
In article <Pine.LNX.4.44.0710101544180.11599-100000 at localhost.localdomain>,
JP Hindin <jplist2007 at kiwigeek.com> writes:
Alas SGI's techpubs only contain the User Guide
and are thin on all other
manuals for the Onyx, that I can find at any rate.
You should be able to find:
POWER Onyx and Onyx Rackmount Owner's Guide 007-1736-060.pdf
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2:51 p.m.
On Wed, 10 Oct 2007, Richard wrote:
Alas SGI's
techpubs only contain the User Guide and are thin on all other
manuals for the Onyx, that I can find at any rate.
You should be able to find:
POWER Onyx and Onyx Rackmount Owner's Guide 007-1736-060.pdf >Indeed it does.
>http://techpubs.sgi.com/library/manuals/1000/007-1736-060/pdf/007-1736-060.pdf
>Last paragraph on page 42.
You mean the one in the URI I included at the top of the eMail you just
responded to? :P
(So I got "User" and "Owner" confused)
JP
3:09 p.m.
In article <Pine.LNX.4.44.0710101650380.11599-100000 at localhost.localdomain>,
JP Hindin <jplist2007 at kiwigeek.com> writes:
You mean the one in the URI I included at the top of
the eMail you just
responded to? :P
(So I got "User" and "Owner" confused)
D'oh! Ya got me, I didn't compare URLs, just looked at the stash of
manuals I grabbed from their web site.
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"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
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7 Nov
7 Nov
1:51 p.m.
New subject: SGI Onyx - Three Phase to Two^H^H^H Single Phase conversion
Greetings all;
Further to my queries some weeks ago, and list suggestions (in particular
Pat Finnegan), I have the answer regarding running my three-phase
configured Onyx on a single-phase 220v outlet.
I removed the four-wire TwistLock plug end and replaced it with a
three-wire stove outlet plug (NEMA10-50R). I connected L1 and L3 to one
hot leg of the 220v plug, and L2 to the other, and N to the GND line. Only
two of the OLS' (PSUs) come up in this wiring manner, so I removed the one
that did not (without removing it the Onyx notices it is there, but not
producing juice, and fails self-test).
The System Controller comes up, boot arbitration completes and
Thunderbirds Are Go.
Actually, one of my blowers has kicked the bucket (and, to be fair, the
other is pretty grumpy, but eventually spins up) and the Onyx is halting
on a BLOWER B FAILURE. But that's another story :)
Thanks again for your help. I thought I'd post back and leave this in the
archives for any future Onyx suckers in my position.
JP Hindin
6037
days inactive
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days old
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