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September 2012

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Subject:
From:
Mike Fenner <[log in to unmask]>
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Date:
Fri, 7 Sep 2012 17:21:57 +0100
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As a soldery person I like the idea of a fusible/soluble link, neat. I'm
sure something could be dreamed up; how to place. Cost effectiveness of link
part price and placing process would depend on volumes.
A secondary thought: It's a very long time since I was involved in static
protection and so on, but possibly an ionizing bar/zone could fix this by
providing a leakage path to ground. (You would need an appropriate fixture.)
Might be worth speaking to a supplier or two, or hope that a current actual
specialist can comment.



Regards


Mike Fenner

Bonding Services & Products
M: +44 [0] 7810 526 317
T: +44 [0] 1865 522 663
E: [log in to unmask]

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
Sent: Friday, September 07, 2012 4:56 PM
To: [log in to unmask]
Subject: Re: [TN] Draining re-striking voltage from a capacitor

Would it be possible to place a removable solder short on the board that
would drain the voltage, and then dissappear in the wave? 

Blair

On Fri, 7 Sep 2012 15:07:23 +0000, Post, Scott E <[log in to unmask]>
wrote:

>We've got some electrolytic caps that are taking on a re-striking voltage
when they're heated up during adhesive cure.  We need to drain the voltage
before wave solder to avoid letting the magic smoke out of nearby components
when the molten solder briefly shorts everything.  I've been asked to design
a station to do this at a conveyor just before the solder pot.  I can
certainly do that, but it bothers me to add custom equipment to the line for
such a non-value added thing.  The board will be installed in a housing
already, so I won't have access to the caps from the top, only from the
bottom through the pallet openings.
>
>Has anyone come up with a clever solution to this?  Maybe something in the
board or pallet design to drain the charge?
>
>Scott Post
>
>
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