W
w0lfd0g
Guest
:'( I'm too late to the party and have been outgunned.
***w0lfd0g slinks back into the shadows never to show his Crack again***
***w0lfd0g slinks back into the shadows never to show his Crack again***
Capacitor p0rn
- Thread starter adamct
- Start date
Grainger49
New member
Adam,
The two largest caps were in a 230V Variable Speed AC GE Drive that was retired. I don't remember why there are two values and voltage ratings. What it does is take AC convert it to DC then pulse width modulate the positive and negative DC buses to form variable frequency AC that drive AC motors. These are early and unsophisticated drives using SCRs. Not like today's drives that use IGBTs.
The two largest caps were in a 230V Variable Speed AC GE Drive that was retired. I don't remember why there are two values and voltage ratings. What it does is take AC convert it to DC then pulse width modulate the positive and negative DC buses to form variable frequency AC that drive AC motors. These are early and unsophisticated drives using SCRs. Not like today's drives that use IGBTs.
4
4krow
Guest
Wolfy, I'm thinking that you wouldn't get far in an airport with those cans! They stopped me once for having an SPL meter.
Maxxximum CAPacity Crack - a cautionary tale.
Grainger49
New member
Yes, Adam, it is a sickness.
I love your work. From memory, the 2nd and 4th pictures are your two Cracks, is that right? What are the first and third pictures of?
Also, based on my recent experience, I HIGHLY recommend that you consider replacing the two electrolytics you left in each of your Cracks...
Finally, can you remind me where you get that cap mounting hardware, or what you use for it?
Thanks!
Adam
Also, based on my recent experience, I HIGHLY recommend that you consider replacing the two electrolytics you left in each of your Cracks...
Finally, can you remind me where you get that cap mounting hardware, or what you use for it?
Thanks!
Adam
HF9 said:Oh yeah, big caps!
Those big puppies look like the AmpOhm paper/oils... I go me some of them. I have to say though, they were just demoted to the subwoofer crossover duty. My new (small) 10uF Queen's are the Mudorf EVO alum/oil. Evo's are more "mature" IMO. In the spirit of disclosure, I do have them bypassed with a silver/oil. If I had the cash I would go with the silver/oil and be done.... Alas... We dream/pine.
I ordered up 2 Dayton 100 uF, 250 V caps as they were a quarter inch smaller diameter than the Solens. Solens would not fit (or would be too close for my liking) and the Daytons fit nice in the stock base glued to the plate with silicone bathtub caulk.
Had to remove the 2 end terminals of the middle terminal strip, but that is no problem as they are just there for mounting the stock caps.
Had to remove the 2 end terminals of the middle terminal strip, but that is no problem as they are just there for mounting the stock caps.
I had considered picking up a pair of those, but wasn't so excited that the +/- terminals are on different sides, and you essentially need to use one of them to ground the thing and mount it.
Don't know if this was already mentioned but be careful, at 400V and the more Farad you have the more dangerous it gets. Energy of a cap: 1/2 * 0,0001F * 400^2V = 8 Joules. If you have like 5 to 10 times as much F this can be really dangerous if touched while fully charged. Caps are quite efficient to f**k someone up. (>20Joules can be enough).
