[win2x_at_hotmail.com: Vax 11/780 - Sun 3/470 w/ Mass storage]

From: Matthew Sell <msell_at_ontimesupport.com>
Date: Tue Jul 17 14:25:59 2001

Richard,


Forgot about that transformer....

I removed two of the three fuses that feed power to the other phases of the
transformer and checked the voltage of the power supply that operates the
interlock system and also monitored the temperature of the components on
the board as well as the transformer.

After running it for about an hour with the main relay pulled in, it seemed
that the transformer and power supply were handling the single phase feed okay.

For everyone on the list: please keep in mind that these checks were not
comprehensive and were just a simple test to see if a easy conversion from
phase to single phase could be made with no internal modifications to the
VAX. I intend to make a conversion box that the stock power plug mates
with, with integral voltage and ammeters in the box to monitor the power
supply to the VAX.

If these conversions are successful, I'll make my notes, observations, and
schematics available to all.

I can't wait to get it all running....... : )



         - Matt


At 12:52 PM 7/17/01 -0500, you wrote:

>On Tue, 17 Jul 2001, Matthew Sell wrote:
>
> > As far as power goes for the 11/780, it looks like it may be possible to
> > feed one with standard 115V, with three separate feeds.
>
>Yes it is, with one exception that I think you've found, from your
>description. There is a 3-phase transformer and power supply that runs
>the power distribution box relays and such. But the actual meat of the
>thing is run off 115 (all phase-to-neutral when run on 120/208 Y). I was
>planning to run mine from split-phase residential 240v, with maybe 4
>supplies on one side, 2 on the other, and the Unibus expansion cabinet and
>some drives on the side with 2.
>
>Good luck in getting it running.
>
>Richard Schauer
>rws_at_enteract.com


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Received on Tue Jul 17 2001 - 14:25:59 BST