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| TimmyA |
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One Drone wrote: You don't have to do this. If you were anal you'd keep a resistor in the car if you had to change batterys or if the battery was dead flat which is rare. But if its a bigger sort of cap like what you probably deal with (maybe above half a farad) then you do charge it slowly is to reduce the possibility of arcing involved with fast charging. High voltages and a small gap between terminals maybe? This arcing won't hurt the cap so much but it might damage the chrome/gold plating on the connectors. Not a biggy. See we are talking about 14 volts max too here... So the max discharge will be at 14Volts... I work with caps in AC so they are seen as a load rather than a storage device... So the charge positive, discharge, charge negative, discharge 50 times a second... If you put a megohmeter across a cap and charge it to 500 or 1000V DC then yes that can jump a gap, but I can't honestly see 14Volts jumping much of a gap? foggy wrote: Guys are you talking about a polarising resistor? With large caps that are left on the shelf to long a fast charge can cause them to explode, very spectacular to see a 2 farad drive cap go off (not). by doing a slow initial charge the cap can then deal with fast discharges. We used to use a lot of big caps in the lift industry and and found it was normally the new caps that had been sitting on a shelf for a while that would go bang on first power up, after the inital charge no problem with rapid charging. Are you talking about caps on AC or DC?  And how many Farads are we talking about?
_________________ 93 Red ED 5spd Manual Build Thread |
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| foggy |
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These are usually a couple of farads and dc. Used for the supply buffering of elevator motor dives.
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| ausedwagon |
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wait hang on. when i instilled my cap into my audio setup i just pluged the thing in none of this crap with charging it. i had no fuses blow or anything.
_________________ 94 White ED Wagon |
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| One Drone |
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Dude, I think you're thinking too much about this. I dunno if it's a big deal. Just posting what I know same as you, there is some wiki stuff on a related topic. Under subheading "Benefits of pre-charging" here http://en.wikipedia.org/wiki/Pre-charge I can't type a whole lot, quickly with a broken hand.
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