Russ, I have documentation for the I2C bus. Voltage is not controllable.
However, Input voltage, Output Current and internal temperature monitoring
are all available. If you are interested in the I2C protocol information,
let me know and I will send it to you off list.
Internal to the power supplies are two potentiometers, I have not attempted
to move them yet, so I can't say for sure if they adjust the voltages.
-Greg, N2GZ
From: vhfcontesting-bounces@contesting.com
[mailto:vhfcontesting-bounces@contesting.com] On Behalf Of kb8u vhf
Sent: Saturday, November 06, 2010 10:02 AM
To: vhfcontesting@contesting.com; ssimons@manitousys.com
Subject: Re: [VHFcontesting] Schematic needed for HP 51V 57A power supply
Here's some information on your power supply (from the Microwave email
list).
Since I wrote this, I powered up mine successfully. I haven't done anything
with it yet, though, other than load test it. I might have had to connect
different
pins to power it up, I'll check later. Apparently the voltage can be
adjusted
via the I2C bus, but I don't know if anybody's figured out exactly how to do
that. I haven't seen a schematic available, either. If you figure out how
to turn
the voltage down, please let me know.
For load testing, I bought two of the supplies, wired them in series, and
ran the
102V to a oil-filled space heater (no fan). It got nice and toasty!
73, Russ KB8U
===============================================
Date: Thu, 19 Nov 2009 23:01:05 -0500 (EST)
Subject: Re: [Mw] Large Power Supplies
I bought one of these. It has the same HP part numbers you mentioned
below, but the connectors are different than what's depicted in the .pdf
you mentioned.
After some sleuthing, I belive I found the pin-outs here:
http://www.powerconversion.com/assets/datasheets/bulk/hps3kw.pdf
I haven't tried the smoke-test yet. Mine has a bit of what looks like
soot by the fans so I suspect it was in a data center fire. No components
look burnt and it smells OK but I guess that's why it was only $10.
Computers with soot in them are considered unreliable so a bunch were
probably scrapped even though they were still operational after the fire.
Should be OK for intermittent ham use.
Hope this helps,
-Russell Dwarshuis KB8U
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