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Old 04-09-2016, 02:45 PM   #11 (permalink)
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This picture clearly illustrates a "perfect" crimp. See how uniform the copper material appears, with absolutely NO demarcation between the crimp itself and the copper strands, giving the visual appearance of being "one" solid piece of copper:


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Old 04-09-2016, 04:28 PM   #12 (permalink)
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My BMS is an Orion. When I first bought it, I was still back in the frame of mind where a bms is just a piece of equipment that kept the pack top balanced, and had some high and low voltage cut offs. It took me a couple builds to fully grasp what an Orion does, but I am hooked now.

I have tried other crimp shapes, but have not done 8 sides. I messed with 6 sides, but it does not work the way I like with only one linear plane where the dies slide together. I have also done a mirror image of what I posted above on the bottom side as well so that there are two anvil indentations across from each other. The deeper crimp that I posted works out best, and the sides of the crimp actually get squeezed in a little as the anvil forces the terminal to the bottom of the receiving portion, since I made the bottom receiver of my tool have a very slight v shape.
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Old 04-09-2016, 04:31 PM   #13 (permalink)
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Quote:
Originally Posted by Old Tele man View Post
This picture clearly illustrates a "perfect" crimp. See how uniform the copper material appears, with absolutely NO demarcation between the crimp itself and the copper strands, giving the visual appearance of being "one" solid piece of copper:

That crimp tests very nicely under load, but you can see the line across the terminal where the anvil mark does not transition as well as it should. It risks shearing strands.
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Old 04-09-2016, 09:04 PM   #14 (permalink)
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Most of the high power variable frequency drives I work with use a crimp that crimps like that, making a triangular or kind of a chevron shape crimp.
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Old 04-10-2016, 12:58 AM   #15 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
Most of the high power variable frequency drives I work with use a crimp that crimps like that, making a triangular or kind of a chevron shape crimp.
That's a good point .. I should look at what our vendors are doing for their crimps on VFDs. I know that at least one of them is using copper buss bar instead of cabling inside the power section. They can bend the buss much sharper than they can bend cables. Plus the buss is bolted to insulators, so it does not move around or rub against other cables, edges, etc during high current events.

But I have not paid much attention to what they've done with the crimps on the cables that they still use.
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Old 04-10-2016, 12:12 PM   #16 (permalink)
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The use of bus bars wherever possible is best, since half as many mating surfaces compared to crimp cables. Cables have strand to crimp lug contact, plus crimp lug to terminal, bus bars only have bar to terminal. I like to use bars, even in places where cable could be used.






Cable would have been tight here. The bus bar is cut to maximize the surface of the fuse though.



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Old 04-10-2016, 02:26 PM   #17 (permalink)
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The military seems to like to silver plated hardware.
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Old 04-12-2016, 12:47 PM   #18 (permalink)
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All the big VFDs use aluminum buss bars.

I think the ultimate efficiency would be copper buss bars that have been silver plated.

The crimps used by allen Bradley in the big drives look a lot like, if not identical to what you have there.
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Old 04-13-2016, 10:53 PM   #19 (permalink)
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A crimp on a 350 amp VFD

An example crimp on one of our older Siemens VFDs

Rated 354 amps continuous at 575VAC

The first pic is of the 3 phases off the bottom of the output bus. Second picture is a close-up of the crimp.

https://www.flickr.com/photos/141097.../shares/yos295

It looks a lot like EVMetro's cut-away

What did you use to slice through the crimp so cleanly? I will attempt to cut a couple of crimps apart to see how good they were.
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Old 04-13-2016, 11:02 PM   #20 (permalink)
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Another example, 600 amp at 575V

2 more pictures with longer lugs and 2 bolts per lug to the phase bus

The crimp-on connectors are longer and the circular crimp does not begin on the edge, but about 1/4 of an inch in. It also stops about 1/4 of an inch from the edge.

https://www.flickr.com/photos/141097.../shares/Xc261q

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