17 Jul
2001
17 Jul
'01
2:25 p.m.
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:
"One World, One Web, One Program" - Microsoft Promotional Ad
"Ein Volk, Ein Reich, Ein Fuhrer" - Adolf Hitler
Many thanks for this tagline to a fellow RGVAC'er...
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(a)enteract.com