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#1
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Re: pic: Battery connector.....
OK, Joe, I knew this was a WildStang rule. It is all flooding back to me now. Thanks for finding the thread. As Aidan explained in that thread, Anderson was fully included in the testing at the time. We did some independent testing and thought our connectors were better but after further investigation at the time, we did adopt the SB50. We have now 10 years of use with our current style of battery and these connectors over thousands of matches. They seem to be doing very well. Even Raul eventually relented.
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#2
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Re: pic: Battery connector.....
I will have to post the picture somewhere else, I can't post pics here. Last edited by Al Skierkiewicz : 30-01-2014 at 10:21. |
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#3
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Re: pic: Battery connector.....
Would it be possible for FIRST to allow both the SB-50 or SB-120? I can't imagine any issues (other than 'the rules don't allow it') to use the next size up connector.
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#4
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Re: pic: Battery connector.....
I assume you've already seen Q81?
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#5
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Re: pic: Battery connector.....
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#6
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Re: pic: Battery connector.....
Quote:
https://frc-qa.usfirst.org/Question/...ribution-board |
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#7
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Re: pic: Battery connector.....
I'd like to see a bigger connector, to allow for the use of 4ga wire without having to cut it down to fit in a 6ga terminal.
In 2003, we used some big single-pole Anderson connectors on our battery, and it was legal at that time. But, it was denied in later years. |
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#8
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Re: pic: Battery connector.....
Bigger connector is heavier, so to the extent that battery and attachment is excluded from the weight of the robot, a team using larger connectors can add more weight this way. Heavier wire and heavier connector = advantage? This is without current carrying advantage of some degree.
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#9
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Re: pic: Battery connector.....
Quote:
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#10
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Re: pic: Battery connector.....
The weight of a plastic connector is a drop in the bucket compared to the brick of lead, which varies by pounds between batteries of different manufacturers.
The big advantage is in current carrying capacity, which FIRST already limits using the 120a breaker. Most of the benefits are thermal, and prevent the wires from becoming sticky or melting (we frequently run the robot hard enough for the #6 wire on the battery to become sticky in 1 match time, at the very least it's always warm to the touch). IMHO, the goal is usually to reduce weight for performance. If we ever are trying to add weight, it's always for CG management (esp. the 2012 bridge balance, or 2013 hanging). I really want to put an end to the near-failures of the main power system we see every year. Even if the connectors don't fail catastrophically like the one in this picture very often, the wires are always sticky, and showing signs that they are undersized. And even if the connector is adequate, we can't easily put a larger wire in the connector, even if there are no rules prohibiting us from using a larger wire (currently we can use #4 wire for the battery side cable, so any argument of weight or capacity of the wire is null). |
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#11
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Re: pic: Battery connector.....
I assume you are talking about the battery. If your battery weighs less than 12 to 13 pounds, you have vented a considerable amount of moisture to the atmosphere. There is a difference in the FR rated case but then again slight. Otherwise there is little difference in batteries.
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#12
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Re: pic: Battery connector.....
Quote:
The weight difference between the SB50 and SB120 plastic connectors is far less than a pound, so the weight difference isn't a significant advantage. |
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#13
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Re: pic: Battery connector.....
http://www.chiefdelphi.com/media/photos/39426
Check out this from 2004, found my electrical students as we check through and unpack our boxes from our other build space. Joe as promised... |
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#14
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Re: pic: Battery connector.....
Quote:
happens but as long as Al is talking, I'm listening. ![]() |
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#15
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Re: pic: Battery connector.....
In the event of a frame fault, the cRio and/or DSC can produce some really crazy issues. In this case I suspect that the fault may have caused multiple motors to turn on in opposite directions or were commanding movement when none was possible. Why? High current in the #6 wire has to go someplace. If it shorted in a #18, then the breaker trips and the wire goes poof. If multiple loads are drawing extreme currents, then no breakers trip and no other wire gets hot enough to melt. When robots get crazy, suspect a frame fault first and look for it. It is sometimes difficult to find. You can try by pulling breakers and adding them back one at a time while looking for the issue. This is how the Banebot shorts were found a few years ago.
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