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In Reply to: MKP AC capacitor for PSU posted by SandroN on March 6, 2007 at 04:59:51:
Peter,100-330VAC can be operated at 450VDC
330-400VAC can be operated at 600VDC
401-440VAC can be operated at 750VDC.Now under no circumstances can the steady state current exceed 15Amps, due
to the nature of the internal connections.Best Regards,
Stacey G. Bauer
Director AC Engineering
ASC Capacitors
301 W. O Street
Ogallala, NE 69153
(308)284-3611
fax (308)284-2708
Follow Ups:
Hi.330VACx1.4142=466.6VDC
400Vx1.4142=565VDC
These two calculated figures go inline with what ASC quoted (+/-5% tolerance).But 440Vx1.4142=622.248V or 653VDC including the +5% tolerance.
Much below the quoted figure.But anyway, it better plays safe than regrets.
As I said, caps tend to shorten their service lifespan bigtime on overrated operation. It may work OK today, but who knows what would happen in long run?
...much better to use a manufacturer's specification.Rating a cap for AC motor usage is a lot more complex than just a simple RMS-to-peak calculation. A motor run cap is not used across the line; it is in series with a motor winding to cause phase shift. You have to consider transients, overloads, motor inductance and back EMF, etc., etc.
That's why I asked ASC in the first place.
These ratings may or may not apply to manufacturers other than ASC, but I would expect similar responses.
Unlike electrolytics, film caps don't have a very strong correlation between vapplied voltage and lifetime.
Hi.such figures were taken from someone's mouth? You gave the impression that someone just gave you some numbers out of his head.
If all those figures you quoted were manufacturers' printed specs, then we got to abide. No question about it.
I agree one caps differ from make to make even using same dielectric materials.
c-J
PS: One time I called up the application manager of a major schottky diode maker on basic specs, & I was not impressed at all with his answer.
I find it interesting that you should miss the person who sent the mail...Stacey G. Bauer
Director AC Engineering
ASC Capacitors
301 W. O Street
Ogallala, NE 69153
(308)284-3611
fax (308)284-2708That's just about as official as it gets, and should probably preclude any further debate about voltage tolerances.
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