[TriEmbed] Power Supply rail current

[Adam Haile]

Yeah, I was definitely wanting a separate current sense on each of the
front panel outputs at least. I like this plan of having a relay drop
out... I was going to need some sort of auto-shutoff anyways for safety.
Will look into that. Seems to make more sense then trying to allow 100A on
any single output :)


On Tue, Jul 8, 2014 at 3:08 PM, Rodney Radford <ncgadgetry at gmail.com> wrote:

> What about have a current sense on each of the output rails independently
> - and be able to switch from the front to measure total current draw, or
> draw on any of the individual rails
>
> Then, if any one of the rails exceeds some max - say 30A if you have 4
> outputs, you cut off the output - either a relay drop out (the easiest) or
> an electronic drop out
>
>
> On Tue, Jul 8, 2014 at 3:01 PM, Adam Haile <email at adamhaile.net> wrote:
>
>> Yeah... I'm trying to build an enclosure around this that adds a few
>> features. Mainly high-side current sensing with an LCD for live output of
>> the real-time current draw and serial output to my computer for
>> data-logging.
>> I would actually like to have 3 separate outputs on the outside of
>> the enclosure (maybe 4) because I'm usually dealing with large LED displays
>> and need to drop power in at multiple points in the matrix.
>> So, yes, I could definitely have a limited total current draw on each
>> output but that makes me a little nervous because, technically, the supply
>> would be capable out throwing 100A at any one of them, probably melting
>> something in the process. So, in my usual mantra of the only kind of kill
>> is overkill, I figured to just engineer for 100A at any of the outputs even
>> if it is unlikely (and probably unwise) that I would ever draw 100A on any
>> single output. As I'm finding, this may e impractical. But it is what I am
>> shooting for.
>>
>>
>> On Tue, Jul 8, 2014 at 2:56 PM, Rodney Radford <ncgadgetry at gmail.com>
>> wrote:
>>
>>> Looks like you have 3x tie points for +V an 3x tie points for -V, with a
>>> total across all three loads as 100A.
>>>
>>> Since you would not want to run a 100A wire (as you see the size
>>> required for that), just run 3x smaller wires.
>>>
>>> Is all 100A going to the same point, and if so, where?  From your first
>>> post, it sounds like you are trying to build a 100A supply around this - is
>>> that true? So why not just feed all 3x of each to the outside instead of
>>> trying to find a 100A binding post?
>>>
>>>
>>>
>>>
>>> On Tue, Jul 8, 2014 at 2:51 PM, Adam Haile <email at adamhaile.net> wrote:
>>>
>>>> I don't actually have it yet... this is part of why I'm asking, to be
>>>> sure that I'm getting the right thing. But the internal schematic on it's
>>>> datasheet (http://www.jameco.com/Jameco/Products/ProdDS/374002.pdf)
>>>> seems to show it as a single output line.
>>>>
>>>>
>>>> On Tue, Jul 8, 2014 at 2:48 PM, Rodney Radford <ncgadgetry at gmail.com>
>>>> wrote:
>>>>
>>>>> Are the three rails really attach to a common point?  Can you visually
>>>>> see they are tied together, or ohm them out to verify that?
>>>>>
>>>>> I have seen power supplies rated on total output, across all supplies,
>>>>> but they are not tied together on the output, so before recommending tying
>>>>> them together, I would need to know if they are already connected.
>>>>>
>>>>>
>>>>> On Tue, Jul 8, 2014 at 2:43 PM, Adam Haile <email at adamhaile.net>
>>>>> wrote:
>>>>>
>>>>>> I'm still diving into my high current supply enclosure build but ran
>>>>>> into a question about the supply I'm looking to buy:
>>>>>> http://www.jameco.com/1/1/2936-se-600-5-se-600-500w-ac-dc-enclosed-switching-power-supply.html
>>>>>>
>>>>>> It's rated at 100A and has 3 separate power rails. Each of which seem
>>>>>> pretty small for 100A. The datasheet (on the link provided) doesn't mention
>>>>>> each power rail being only able to handle a portion of the total rated
>>>>>> current so I assume they are just there for convenience. However, my
>>>>>> ampacity tables are recommending around a 2 gauge wire for 100A... which is
>>>>>> freaking huge. Not even sure I could fit that on the supply terminals.
>>>>>>
>>>>>> Should I just tie all three outputs into one to step up the gauge?
>>>>>>
>>>>>> Also, anyone know where you can actually buy a 100A binding post?
>>>>>>
>>>>>> _______________________________________________
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>>>>>> TriEmbed at triembed.org
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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