Re: Burned Connectors in PCs -> Bypass

[scitel@t-online.de (Dr. Gerhart Hlawatsch)]

Pierre!
imo the cause of the trouble is neither the backplane nor
the power-supply. I had the same problem observed with
proprietary systems running a lot of additional power
consumptive high speed electronics about 11 years ago.

In my case I observed quite a high voltage drop over the
connector after some time of operation. It seems that the
tin plated pc ps-connectors degrade with time and increase
resistance and, hence losses, which led to significant
heating of the connector pins, the wires, and the board.

My remedy was:
I soldered a bypass between the ps-cables and the backplane
with a 4 sqmm cable, one for ground, and one for 5V and that
was it. If you want to stay detachable, you can add high
current connectors in the bypasses.

Good luck
Gerhart

"Pierre L. Deslauriers" schrieb:
> 
> We have a rackmount PC with a 400 Watt power supply.  The
> power consumption of all our cards is quite high, about
> 284 Watts, still less then 75% of the rating though.  The
> power supply is rated for
> 30-50A for the +5V
> 20-11A for the +12V
>         Shared between the 2
> We are drawing 36A of +5 and 8A on the +12
> 
> The problem is that, after time (6 months - 1 year), the
> units will fail and we noticed that the connectors which
> mate with the backplane are actually fused(melted) to the
> backplane.  In line with the +5 V wires (red wires), the
> connector is actually black and in many cases the
> connector is arc welded to the backplane.
> 
> Ideas.
> 
> ... Pierre

-- 
Mit freundlichen Grüßen
Gerhart Hlawatsch
mailto:ghl@scitel.de

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