You wrote....
From: Brister%mail.dec.com
List-Post: [email protected]
Date: 02/06/97 08:20:35 AM
Subject: Input power connections with removable cord set.
Hello,
I may have inquired of this forum on this subject before, I can't
remember. I
am interested in what your experience has been with overheating of
removable cord sets at the equipment input end. This would include the
cord and the
appliance connector.
I don't know how many folks out there actually get involved with
post-sales
customer complaints, but perhaps you have some information you can
share.
My experience has been that such occurrences are rare, when considering
the number of products which utilize this type of input power
connection. After
the damage is done it is very difficult to pin point the exact cause for
the
failure. With the few examples I am aware of, I have not been able to
find a trend which might suggest some commonality.There are any number
of reasons this might happen. If you have investigated such failures
what have you found or what do you believe the more reasonable cause?
Thanks for you time.
Bob Brister
Digital Equipment Corp.
Bob Brister
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I have not investigated this type of failure in our products. However, over-
heating at appliance inlet results from an unexpected impedance. This
could result from any of the following:
1. Unit mounted male pins are not connected properly to internal wiring.
2 Cord sockets do not provide sufficient contact area to pins.
3. Cord female connectors are not well connected within the socket end
of line cord.
IEC 320 includes plug force tests. If force required is too high, there is
risk of pushing/pulling the male pins away from their internal connections.
If the force is too low, the line cord may drop from the unit, or worse, not
provide the intended low impedance path.
George Alspaugh
Lexmark International
