All, thanks for the info. I'm glad to hear that I am not the only one that would consider the Phidgets current sensors "low impedance" and thus legal.
Al, I as well can't make out the details of the schematic but it's no big deal. It looks like the Phidgets devices are a COTS solution to our problem.
Quote:
Originally Posted by writchie
IMHO these would be legal, assuming the supplier qualifies as FIRST legal. IMHO such hall effect units are the best solution because they are electrically isolated from the power leads.
Note that they are good for 500% overload i.e. 250 amps.
50 amps is probably not enough range for all conditions. You could probably replace the 50 amp parts with the 200 amp allegro parts. That would enable you to measure currents near stall conditions.
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I haven't gone back and double checked but I think Trossen Robotics was even listed as an official supplier in the Kit of Parts when they were flashing the suppliers and sponsors before the start of the Kickoff. The Phidgets devices are available as COTS from several internet suppliers so I don't see any reason they wouldn't be legal COTS from that persective.
As long as they meet FIRST's idea of "low impedance" then I think they are legal.
I'm not sure why we would ever need more than 50A. We can't have any motor on a breaker greater than 40A so why wouldn't 50A be enough. Same with the 20A and 30A Phidgets on 20A or 30A breakers. Please explain further if I am missing something.