On 1/22/23 18:15, fxkl47BF--- via Emc-users wrote:
On Sun, 22 Jan 2023, gene heskett wrote:
On 1/22/23 04:19, fxkl47BF--- via Emc-users wrote:
On Sat, 21 Jan 2023, gene heskett wrote:
On 1/21/23 20:23, fxkl47BF--- via Emc-users wrote:
i acquired a non-working ps 613u power supply
two 2200uf caps had exploded
i replaced them and it appears to be working
my complaint is the voltage and current pots are very sensitive
it's near impossible to adjust them with any precision
i'm thinking to replace them with multi-turn pots
is this a good idea or a waste of time
https://www.velleman.eu/downloads/2/ps613a502.pdf
The caps exploded? On your bench or sometime in the past?
that's how it was when i got it
So you don't know the history. As a CET my best guess in that case would
be that its a 125 volt unit, accidentally plugged into a 250 VAC circuit
and turned on. What size is the fuse supposed to be? It should have
cleared before the explosions of the caps. There might be other failures
in the aftermath. input rectifiers need checked, So would the switching
transistors in the power circuit. Once you think you've found and
replaced the obvious stuff. I'd fire it up on a powerstat set for 50% or
60 VAC, and raise it slowly over several hours to normal input voltage
while scanning it with an IR thermometer looking for other hot components.
This is a CET's SWAG, so plz report what you find.
after i replaced the caps i fired it up
the fuse was not blown
But was it the right size?
it works as advertised but is very difficult to adjust
Some contact cleaner sprayed in the pots if open enough to get the spray
inside might be in order. If room behind the pots for the helipots
length, a replacement might be worth the cost. Those I've used have
been pretty stable.
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Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
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- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
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