[TriEmbed] Power Supply rail current

[Adam Haile]

Ok, yeah, that's what I was thinking. I wanted it to be normally open and
then energize the relay to close and provide power. That way when I turn
the supply on, nothing is connected by default. But I assume I still have
to be worried about the contact welding in that scenario since I might
already have the device drawing power hooked up (I would rather not have to
disconnect it every time I start up the supply).

Also, I think I found my power rails:
http://www.amazon.com/dp/B000H9JRI0/ref=biss_dp_t_asn
1/8" x 1/4" copper bar stock. My calculations show this should be able to
handle WAY more power than I need. And it's pretty cheap. Figure I'd just
do a slightly wider than 1/4" trace and then solder this on top.


On Wed, Jul 9, 2014 at 4:19 AM, Scott Hall <scottghall1 at gmail.com> wrote:

>  On 07/08/2014 05:50 PM, Adam Haile wrote:
>
> So,  let me make sure I understand this...
> When you say have the relays energized, I know you mean energize the
> solenoid but do you mean by that that the relay contacts are closed (power
> flowing) or open (no power)? I'm guessing you mean don't go from open to
> closed while there's power flowing since their will be a temporary arc?
> Could I just use a normally closed relay and then use the microcontroller
> to open the relay and cut the power if I need to.
>
>
> For safety reasons, you want the relay to disconnect if energizing power
> is removed.  An NC contacts will not break the circuit if you have power
> control problems to the energizing coil.
>
>
>  Do you have any links to those higher cost relays? I would really love
> to actually make it so that I could have a button on the front (hooked to
> the uC) that would allow me to, using the relay, turn the power on or off
> to any of the outputs. So having one of these nicer relays, if not too
> expensive, might be nice.
>
>
> Look up "contactors" for relays designed for high currents and regular
> switching.
>
>
> --
> Scott G. Hall
> Raleigh, NC, USAScottGHall1 at GMail.Com
>
>
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