In message
<64D32EE8B9CBDD44963ACB076A5F6ABB02716FA6@Mailbox-Tech.lecotech.local>,
dated Thu, 17 Sep 2015, "Kunde, Brian" <[email protected]> writes:
This lab area has surge protection, so again, we believe the problem is
some kind of low voltage transient, voltage dropout, or waveform
distortion that we have been unable to detect and simulate.
You are clearly experiencing some very unusual effect. Obviously, it's
even more difficult to diagnose by email. However, I suspect an
interaction inside the products is responsible, and a few things come to
mind:
- I suppose you do have fuse (or equivalent) protection for this DC
power supply appropriate for its full-load current, not 10 times as
much. I still see 30 W supplies 'protected' by 1 amp fuses.
- Exactly what goes 'BAM'? and is it the same parts in different
designs?
- Do the power supplies have active power-factor correction? If so, are
those parts particularly damaged?
- Were the high-current line filters in circuit when the two lab
failures occurred?
- Are these filters inside the products or external boxes?
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
When I turn my back on the sun, it's to look for a rainbow
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
