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Old 02-04-2011, 09:25 PM   #4298 (permalink)
MPaulHolmes
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Location: Maricopa, AZ (sort of. Actually outside of town)
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Michael's Electric Beetle - '71 Volkswagen Superbeetle 500000
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OK, I finished adding the precharge relay and precharge resistor. The resistor is rated for 50 amps at 550v and is 20 Ohms, and is self protecting, so that if the temperature rises, the resistance starts to drop, but once the temperature goes above like 75 degC, the resistance goes really really high. So, when you turn the key and turn on the 12v, the caps will precharge in around 1.5 seconds. But because of the voltage monitoring, if there's some sort of short in the mosfets or capacitors or whatever, and the caps aren't charging, it just won't close the main contactor, and it will flag an error. At least that's what the code will do once I get that stupid friggen self righteous "can't change the video mode back.... um..." ubuntu working again.
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