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  #31   Spotlight this post!  
Unread 01-12-2007, 02:55
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Re: do we "NEED" the power distribution block

See what i said was not for my personal benefit. I do know some team that use drill motors for their drive trains and don't need the 40 amp fuse panel. Making them use a part for no apparent reason is pointless that is why some are upset also if you read what i said in the begging of my last post here was a series of possible questions that could arise and i stated the possibility of the power distribution block coming back. I was looking at it through a design stand point and no more not wining or any other thing because in the end rules are rules and if you don't follow you don't play.



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Unread 01-12-2007, 08:12
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Re: do we "NEED" the power distribution block

BlackShadow,
OK, you have a lot in your post that needs to be addressed....
You are correct that the longer a battery cable becomes the more power is lost, at 200 amps that amounts to about .1 volt per foot of wire (both black and red please) but that has nothing to do with the distribution panel.
Yes, you are also correct that a simple positive post and a negative post would be electrically identical but that implementation makes insulating the two posts difiicult leaving exposed electrical (high current and unprotected by breaker) connections.
Yes there is a lot of empty space inside the distribution blocks. These blocks cover a wide range of product and the size is meant to allow these different products to be stacked next to each other on the same rail. In practice, you could have #22 control wiring , #26 data cable, #18 low voltage solenoid wiring, relays, #12 or #14 AC 110 volt wiring and #6 or #4 three phase 208 volt motor wiring on the same set of blocks. The need to consider insulating all of these mixed schemes is accounted for in the design. The insulation between and among the blocks is designed to prevent arcing between terminals of more than 300 volts.
Yes, you could build the robot with one or two ATC fuse panels. The current drawn by the high current motors then flow through the same wires that feed the RC and as pointed out above, at 200 amps, that is 0.1 volt per foot. Add more motors (say four small and two large Chalupas) and the current can now cause a 0.3 volt/ft. drop. Add that to four feet of battery cable and the internal resistance of the battery and you are dangerously close to the 8 volt cutout of the RC. By splitting these high current loads away from the rest of the wiring as close to the battery as is possible allows the RC voltage to remain high while the motors receive less.
Yes, you could drill through all the blocks and attach the battery cables that way, but the manufacturer has provided a jumper module that is capable of high currents. If you design your distro properly, you can actually attach the battery at the center of a jumper and thereby split the currents right in the block.
BTW, to give credit where due, it was Tom Edison and the DC wiring, Ben was the nut with the kite in the rainstorm.
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Last edited by Al Skierkiewicz : 01-12-2007 at 08:14.
  #33   Spotlight this post!  
Unread 01-12-2007, 10:50
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Re: do we "NEED" the power distribution block

Al Skierkiewicz Now that i think about it your right about Thomas Edison but when i wrote this was at 2:30 Am so thanks for the save.
But when you were talking about
"If you design your distro properly, you can actually attach the battery at the center of a jumper and thereby split the currents right in the block."
Are you trying to say their might be a part from this company that we could use?
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Unread 03-12-2007, 07:18
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Re: do we "NEED" the power distribution block

What I meant was, attach the battery leads to the center of a jumper and the current will split to both sides. If you tie in the battery at one end of the jumper then the currents all sum through the length of the jumper.
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