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Complex PSU wiring help

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rthorntn:
Hi,

A big thanks to anybody who has helped me in the past.

I have four meanwell SMPS (two 3.3v & two 15v).

For an S-100 project I need to create three voltages +7, +14 and -14 that go in to a 10 position connector (+7, +7, GND, GND, GND, GND, GND, GND, +14, -14).

So the two 3.3v supplies dialed up to 3.5v and connected in series and the two 15v supplies dialed down to 14v and connected to create both a positive and a negative voltage.

All of the supplies each have 7 screw terminals (L, N, GND, -V, -V, +V, +V).

Can someone please help me out with exactly how to wire it all up, a "back of a beer mat" kinda thing?

I'm thinking of using ring or spade terminals?

I think I "daisy chain" L and N?

How do I cable ground, connect the four SMPS grounds together?

Thanks again.

Richard

rthorntn:
Just trying to get help on the correct wiring, I will give it a try, is this it?

For the +7v:

PSU_A positive connects to +7 on the 10 pin connector
PSU_A negative connects to PSU_B positive
PSU_B negative connects to GND on the 10 pin connector

For the +16v & -16v:

PSU_C positive connects to +16 on the 10 pin connector
PSU_C negative connects to GND on the 10 pin connector
PSU_C negative connects to PSU_D positive
PSU_D negative connects to -16 on the 10 pin connector
PSU_D positive connects to GND on the 10 pin connector

I think that's it but how to populate and chain the 10 pin connectors six ground pins and two +7 pins?

Also should all four supplies have their floating grounds connected together?

Muny:
Hi,

If I understand what you want correctly:


I think that is what you want.
Without trying it myself though, I can't guarantee the safety or proper operation of this.
Sorry if it looks a little confusing. I will see if I can make it look neater.

rthorntn:

--- Quote from: Muny on March 29, 2019, 09:25:56 pm ---I think that is what you want.

--- End quote ---

Perfect thanks Muny, would you mind sharing the name of the software that you used to draw this?

Would I connect AC earth to each PSU GND then?

Also trying to figure out if I should buy anything at Jaycar (or online) to use, for example to neatly split the three PSU negatives going to the six connector ground pins, a bus bar sort of thing?

Muny:

--- Quote from: rthorntn on March 29, 2019, 11:08:35 pm ---
--- Quote from: Muny on March 29, 2019, 09:25:56 pm ---I think that is what you want.

--- End quote ---

Perfect thanks Muny, would you mind sharing the name of the software that you used to draw this?

--- End quote ---

I used KiCAD to produce that drawing: http://kicad-pcb.org/
I wouldn't say it's perfect for drawing wiring diagrams (you can't change the colors of certain wires), as it's tailored specifically for circuit schematics. But it does do them pretty nicely.


--- Quote ---Would I connect AC earth to each PSU GND then?

--- End quote ---
Yes, I believe that is the intended function of these terminals of the power supplies. IIRC (?) they connect to the metal chassis of the supplies. I would consult the datasheets/user manuals for the supplies though.


--- Quote ---Also trying to figure out if I should buy anything at Jaycar (or online) to use, for example to neatly split the three PSU negatives going to the six connector ground pins, a bus bar sort of thing?

--- End quote ---

I've used these things successfully in some projects. Keywords I used were "distribution block." I've seen other designs which would probably work well too.

Hope these suggestions helped. Good luck on your project.  :)

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