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Unread 18-04-2010, 08:43
Bill_B Bill_B is offline
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Re: elim field issue?

Quote:
Originally Posted by steelerborn View Post
I am not to savvy when it comes to electrical problems.
But we had a similar problem last year with current running through the bot.
What may be the problem is an exposed wire that was touching a metal part sending current through the frame. We had a hard time connecting to the field for all of our second regional last year.

.....
A single exposed wire touching the frame would not cause current to run in the frame other than charging its capacitance, that is, minuscule. The possibility of serious short circuits is the principal reason FRC robots are forbidden from using the chassis grounding method that is nearly universal among automobiles. In that case, a wire that contacted frame metal via frayed insulation would almost certainly be a short circuit.

Part of your electrical self-inspection should be a voltage check between all of your fuse-block outputs and the frame. It should be zero in all cases, of course. Resistance checks are a bit trickier, but so is infinity. Just ask Buzz Lightyear. I haven't watched event inspectors, but I'd guess they do some elementary measurements, don't they?