They are just smiling because they are happy!
Joking aside, Have you compared their maximum ripple current rating,
and the ripple current that the pulsation controller loads them with,
during the pulses?


On Wed, Jul 14, 2010 at 10:27 AM, Roger Weichert
<rweicher@bigpond.net.au> wrote:
> Hi guys,
>
> I've been going to ask for a while about possible causes for the failure =
of
> some 10,000uF 35v electros that are used in a basic power supply for a
> pulsation controller.
>
> There are 7 of them in parallel and on a couple of occasions I have seen
> where nearly all have swollen and split their tops and leaked and dried o=
ut.
> In fact they rattle quite noticeably when you shake them.
>
> >From my understanding I thought that electros only burst if they are fed
> with AC or if their voltage rating is exceeded.
>
> In both cases the rectifiers were ok and on fitting new caps the supplies
> worked fine.
>
> The originals are rated at 35 volts and even unloaded have a maximum of 15
> volts applied. The 240v input would have to more than double to get the
> secondries anywhere near 35v !!!
>
> The originals were also only rated at 85 degrees, and I've fitted 105 deg=
ree
> replacements, but while excessive temperature can dry them out, I wouldn't
> have thought it would cause this problem.
>
> I've uploaded an image at =A0 =A0http://imagebin.ca/view/HX_1Ati.html
>
> Any thoughts please.
>
> Regards, =A0 Roger
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist