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### Topic: Help with hooking up a power supply (Read 992 times)previous topic - next topic

#### jerseyguy1996

##### Aug 15, 2012, 12:40 pm
I purchased a few of these power supplies from MPJA.com and I can't find a data sheet on it.  There is an "L", an "N", and an "FG" on one side and then a couple of "Vo" and "GND" pins on the other side.  I am assuming the "Vo" and "GND" is the regulated 12 volt out side but I want to make sure I understand where to hook up the high voltage AC side.  I would guess that "L" would stand for "Line Voltage" which would connect to a black or red wire in a plug, the "N" would stand for "Neutral" which would connect to the white wire, and "FG" would stand for "Frame Ground" which would connect to the green or bare copper wire in a plug.  Does this sound right?  Do the "GND" and "FG" connections need to be isolated from each other or does it matter?  I have a picture below of the unit.

Arduino Uno;
Mega328

#### Riva

#1
##### Aug 15, 2012, 01:46 pm
How do you know it's 12V output. Is there a more meaningful label on the side of the PSU that gives the input/output rating of the power supply?

L = Live
N = Neutral
FG = Earth
In the UK Live is Brown, Neutral is Blue & Yellow/Green is Earth but you will have to determine the correct colours for your country.

Unfortunately the output stencil is partially obscured in the image so I cannot see if you have a +Vo & -Vo or if both are +Vo. If you have the former then be sure to connect output correctly else you may fry something important. If the latter then maybe they are different voltages.
Just take care.
Don't PM me for help as I will ignore it.

#### jerseyguy1996

#2
##### Aug 15, 2012, 02:29 pm

How do you know it's 12V output. Is there a more meaningful label on the side of the PSU that gives the input/output rating of the power supply?

L = Live
N = Neutral
FG = Earth
In the UK Live is Brown, Neutral is Blue & Yellow/Green is Earth but you will have to determine the correct colours for your country.

Unfortunately the output stencil is partially obscured in the image so I cannot see if you have a +Vo & -Vo or if both are +Vo. If you have the former then be sure to connect output correctly else you may fry something important. If the latter then maybe they are different voltages.
Just take care.

Hi and thank you for replying!  This is the item that was purchased which shows it as 12V.

http://www.mpja.com/12V-35A-Ilan-Power-Supply/productinfo/16741+PS/

I think it may say it on the unit itself somewhere but I am in the office now and don't have it to check.  I will verify that both outputs are +12V with a meter before I use it.  Thanks again for your response!
Arduino Uno;
Mega328

#### Riva

#3
##### Aug 16, 2012, 08:30 am
From the link you supplied I can see the label and it is indeed a 12V 3.5A output. The supply voltage is 110-240V AC so should work most anywhere in the world. Still cant quite see if it's +12V -12V or both +12V outputs.
Don't PM me for help as I will ignore it.

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