Quote:
Originally Posted by bones007
I have a question about pre-charging the controller. Is there any reason why we shouldn't just put a resistor in parallel with the main contactor and just leave it there. If we do so then the controller caps will always be charged up and there is no need to wait some time before closing the contactor.
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It's a safety issue. Caps charged to battery voltage can give quite a zap. So having a precharge resistor that can be switched by relay means that the car can sit with the caps discharged (and relatively safe) when not in use.
It's only a few seconds anyway.
Quote:
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I remember a long while back that there was some problem with the order of turning things on: Turn controller on, apply high voltage, run for a while, remove high voltage, shut down controller. Is this the reason for disconnecting the pre-charge resistor? But, wasn't this solved when all the opto-isolators went in (ver 2c). If so why are some of you disconnecting the pre-charge resistor using a relay?
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The above has always been my understanding as to why.
ga2500ev