If I may high-jack this thread briefly, it is on the subject of
Power-One PSUs. I've just built a 6U case, incorporating a dual
output (HCC-15-3) unit. The case has a single distribution
board (for now) with power going in centrally (to combat line
overload) and the + and - lines use two tracks anyway. There are
9 sockets on this board (of which I'm using 5).
I have jumpered pegs 2 and 3 and applied AC (via a switch and
fuse) to pegs 1 and 4, with 5 being left alone as per the
instructions. I have wired the + out and - out pegs from the PSU
(there are several others to choose from i.e. S+ and S-, and in
the centre, S+, S- and Com) to the + and - lines on the dist
board, respectively. The 0V line I have attached to the frame, and
from there to the Earth point of the power cable.
I appear to be having trouble with the earth. The case powers
up, but it doesn't run the modules properly. I've checked the
outputs, and I'm getting 24V across the + and - terminals, but
when I check +12V to Earth or -12V to Earth I get a reading of 0
and -0 respectively.
I've checked the continuity from the IDC sockets through to the
earth pin of the plug and there is good continuity. Similarly, there
is good comtimuity for each of the power rails back to the PSU.
The IDC sockets are sound with no shorts, and the board is
correctly isolated from the case. All the mains wiring and the
wiring from PSU to dist board is from mains flex rated at well
above the 3.4A maximum.
I suspect I've misunderstood something rather than there being
a physical problem with the wiring.
Your assistance would be greatly appreciated.
Power-One PSUs. I've just built a 6U case, incorporating a dual
output (HCC-15-3) unit. The case has a single distribution
board (for now) with power going in centrally (to combat line
overload) and the + and - lines use two tracks anyway. There are
9 sockets on this board (of which I'm using 5).
I have jumpered pegs 2 and 3 and applied AC (via a switch and
fuse) to pegs 1 and 4, with 5 being left alone as per the
instructions. I have wired the + out and - out pegs from the PSU
(there are several others to choose from i.e. S+ and S-, and in
the centre, S+, S- and Com) to the + and - lines on the dist
board, respectively. The 0V line I have attached to the frame, and
from there to the Earth point of the power cable.
I appear to be having trouble with the earth. The case powers
up, but it doesn't run the modules properly. I've checked the
outputs, and I'm getting 24V across the + and - terminals, but
when I check +12V to Earth or -12V to Earth I get a reading of 0
and -0 respectively.
I've checked the continuity from the IDC sockets through to the
earth pin of the plug and there is good continuity. Similarly, there
is good comtimuity for each of the power rails back to the PSU.
The IDC sockets are sound with no shorts, and the board is
correctly isolated from the case. All the mains wiring and the
wiring from PSU to dist board is from mains flex rated at well
above the 3.4A maximum.
I suspect I've misunderstood something rather than there being
a physical problem with the wiring.
Your assistance would be greatly appreciated.
--- In cgs_synth@yahoogroups.com, sasami@h... wrote:
>
> >BTW, If you're outside of the US NEVER buy from Allied. I
thought
> >this shipping charge was large because of the weight of the
Power
> >One PSU's, so last month I foolishly ordered some Vactrols
and 20 of
> >8 pin IC's that would fit into a jiffy bag and Mouser would
charge
> >$12 by USPS small packet. They came in a big box (!) and
Allied
> >charged me $89 shipping, despite me requesting that items
be shipped
> >by USPS small packet service. I'm now the proud owner of
some of the
> >most expensive Vactrols in the Universe :-(
>
> I've heard this story before, so you aren't the first person they've
done it
> to. Bad news.
>
> Ken
>
__________________________________________________
_____________________
> Ken Stone sasami@h... or sasami@c...
> Modular Synth PCBs for sale
<http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies
<http://www.blaze.net.au/~sasami/>