[pure-silver] Re: Speedotron 2401A
- From: "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 02 Oct 2006 19:12:26 +0200
Jim
It makes sense to me, just can't do it with my unit, but it does make sense.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2006-10-02 18:26, "Jim Brick" <jim@xxxxxxxxx> wrote:
> The most destructive thing for large high voltage electrolytic
> capacitors, is the discharge cycle. It rapidly collapses the
> capacitor and this is what eventually causes shorts within the
> capacitor. A charged capacitor keeps everything formed and in order.
> I have absolutely no idea why Speedotron would fire the unit upon
> power off unless it's so one does not short out the unit by removing
> connectors (heads) when the capacitors are still hot. I have a half
> dozen Dynalite packs. They do not do this. I've never worked on a
> Speedotron. I've never worked on a unit that fires the lights when
> powering down. Some units slowly bleed off the charge through a large
> resistor so that should the unit need to be opened-up, the technician
> won't get electrocuted. It hurts! I know!
>
> Ask any EE worth his salt about forming and collapsing electrolytic
> capacitors and they will tell you what I did earlier. Don't rapidly
> discharge a large high voltage capacitor and then not reform it. That
> is, don't fire a strobe unit after the power is off, leaving the
> capacitors collapsed.
>
> BTW, Oregon State (Corvallis) 1955-1959, EE. Brooks Institute of
> Photography 1959-1961, commercial photography.
>
> As far as someone having a unit that works after years of leaving the
> capacitors collapsed, well, there are people who smoked a pack a day
> and lived to be 100. I'm simply explaining the physics of the care
> and feeding of large high voltage capacitors. There are always
> anomalies, and like anything else, there are quality variations in
> the manufacturing of everything. The best way to insure long
> capacitor life is to treat them properly. Re-form them immediately
> upon discharge. Leave them formed (full) or discharge them slowly
> through a large resistor at power off.
>
> Jim
>
>
> At 11:47 AM 10/2/2006 +0200, Ralph W. Lambrecht wrote:
>
>> The Speedotron units do this as a matter of operation. When you turn the
>> unit off, it fires all lights. Speedotron suggests to turn the power to full
>> before turning it off to discharge the capacitors. Why do you think they
>> suggest that? Or did I misunderstand something?
>
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