Question on power supply terminals

duragezic

Lifer
Oct 11, 1999
11,234
4
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There's this 27 VDC/18 A power supply I dont really get. I dont know the exact model # offhand or I'd look up a datasheet. Basically as it was hooked up, the AC L (black) and N (white) are connected to the input terminals, and the green GND is connected to the F.G. terminal in the input then a wire was ran to one of the output terminals too. The row of output terminals has like 6-8 terminals (they are some sort of screw-down ones that hold a #6-ish ring terminal or maybe just stick wires in there directly). But I dont get the way they are marked

An example drawing (terminals are marked with a '[]') with the labels on the power supply underneath


[]----[]------- []-------[]------[]-------[] -------[]
S(-)---V(-)---- ?-----V+----27V/18A---- S+



Not necessarily in the order (I dont have it in front of me) but basically I'm only use to the power supplies with +/-, and I dont get what I need to hook up/why there is so many terminals if all I want is two + and two - DC voltages (two circuits in parallel hooked to this, each getting 27 V and current roughly shared equally). I've seen similar supplies hooked up where the S- and S+ terminals are used, and others where the 27V/18A terminals (this label covers two of the terminals it seems) are used. Whats the difference?
 

duragezic

Lifer
Oct 11, 1999
11,234
4
81
I created a quick picture to better show what I meant.

I only included the row of output terminals since I'm pretty sure the input terminals for the 120 VAC are connected correctly and theres well not a bunch of choices as to where to bring the hot and neutral lines from the wall socket. :)

I tried some combinations with a DMM on the output terminals but I never registered anything but 0 V (tho I didnt try every terminal combination, this was the last few minutes before I left). I should be able to read 27 V without a load/with a disconnected circuit, right?