On Tue, Nov 13, 2018 at 07:31 PM, Chuck Harris wrote:
I had a consulting contract years ago to help a
Swedish company with a problem they had in converting
from European 240V to the USA 120V. The engineer that
did the conversion didn't understand the ratings of the
molex connector.
He saw the 17A rating, and saw the 15A drawn by the heater,
and said, "Looks good, ship it!"
And, then the problems began. In the US, the connectors
burned up after the third or fourth cycle of the instrument.
The customers were not amused, and even less amused was
the guy that relocated his family to the US to become the
president of the USA division... My customer.
What happened?
Well, molex rates their connector at 17A with the following
stipulations:
1) 25C ambient temperature.
2) 12 inches of #14ga stranded wire on each side of the
connector with everything suspended in free air.
3) only one pin set per connector shell.
Does that sound like what you are doing? If so, you will
be fine.
It didn't sound like the Swedish company's 4 circuits in a
shell, with 3 inches of wire between connectors, and placed
next to a 700W heater... OOPS!
-Chuck Harris
Harvey White wrote:
On Wed, 14 Nov 2018 07:33:38 +1000, you wrote:
...
On the current ratings, from what I understand, the current rating is
good, but goes down with the number of insertions.
I completed the overhaul including the installation of Molex connectors for the transformer leads. I posted before and after pictures here:
/g/TekScopes/album?id=79113Overall, it went well. A little crowded now inside with the addition of the Molex connectors.
I still have other issues with the 577 I need to track down - traces look OK for diodes but don't line up for transistors; as other have stated "the out and back I-V curves do not lie on top of each other". I saw other posts on that topic and will pursue this next. And the storage option doesn't work either (it's a D1).
Thank you,
Wolfgang
