[SI-LIST] Re: Latching relays in optical switches

Aubrey,

  Yes, that question occurred to us as well--whether or not there was an 
internal path for current leakage that would increase the internal temperature 
beyond some critical threshold.  The manufacturer claims that the leads are 
connected solely to the coils, and we have confirmed this by tearing open a 
defective one to verify.

Thanks,
-don
--
Don Nelson

"The whole problem with the world is that fools and fanatics are so sure of 
themselves, and wiser people so full of doubt" --Bertrand Russell

 
On Tuesday, May 19, 2009, at 03:39PM, "Aubrey Sparkman" 
<asparkman@xxxxxxxxxxxxx> wrote:
>The question that occurs to me:  Is there any other electronics inside that
>you can't see?  Are you sure you have only two coils wound on the same core?
>If there are some built in FETs, they could have a preference and be causing
>some trouble...
>
>
>Aubrey Sparkman
>Aubrey.K.Sparkman@xxxxxxxx
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
>Behalf Of Kevin G. Rhoads
>Sent: Tuesday, May 19, 2009 2:31 PM
>To: Don Nelson
>Cc: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: Latching relays in optical switches
>
>>The problem is, the manufacturer disagrees and insists our circuit 
>>needs to be redesigned to permanently tie one leg of the coils to GND and
>switch the high side instead.
>
>While that is more common, either should work.  Particularly since you have
>verified the +5 rail is not moving, which indicates it is a good ground for
>all non-DC signals.
>
>If you induce current in the other coil then the flux-linkage through the
>magnetic circuit is kept minimal.  That will interfere with switching.
>
>As for: 'They contend that having the 5V potential on the coil permanently
>is "interfering with the magnetic field".  I find this hard to believe, but
>physics was a long time ago.'  
>That sounds like pseudo-scientific cruft.  You should find it hard to
>believe.  
>
>HTH
>Kevin
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