[tauntdesigns]

Hi group,

I bought a Sure step Power Supply(PS) a few years back and am in need of some help......

There's a slide switch on the PS for selecting 120/240. I've selected 120v.
There's 3 terminals for wires from the AC input.

GND
L2
L1

I have a cord with 3 wires.

Green(GND)
White(neutral)
Black(hot)

HELP! Don't want to let the smoke out.

Here's a link to a pdf:
http://web2.automationdirect.com/sta...manual/ch4.pdf

Thanks and Cheers,
Jack

[Micro_CNC]

I believe if anything L2 would be neutral because its closer to the ground lead. From my limited experience building CNC power supplies i have never taken note of live or neutral and just called it AC and put a rectifier in line. I'd imagine your best bet would be to call/email the manufacturer or you could also follow the black and white wires from the transformer to the L1/2 terminals and match up the wires from the wall.

http://en.wikipedia.org/wiki/Three-phase the L's are used in the formulas - Plain AC (north america anyway..) is 2 phase so just take out L3 and you have our AC power.

[Micro_CNC]

found an answer, in europe live/hot is called Line 1 and neutral is called line 2

so L1 = Live/hot and L2 = Neutral

edit; srry double post...

[tauntdesigns]

Thanks for the reply,

I've wired a PS from Kelinginc for my mill conversion (2 black wires to ac hot, 2 red wires to ac neutral, and ac ground to chassis)

This one has the transformer wires going to a circuit board. The circuit board has a terminal for 3 wires and is kinda' throwing me off........ I was originally going to wire it like you said, but thought I would ask here first.

Thanks again for the reply and link,
Jack

[tauntdesigns]

Thanks for the 2nd post Too!

Kool, makes me feel better about hooking it up that way.

Again, thanks alot
Jack

[Al_The_Man]

You shouldn't have a problem which ever way you connect L1/L2, but the fused side should be on the hot lead, so if you want to confirm the correct connection, check by meter whether L1 or L2 is connected to the 3A fuse, this will be the live terminal.
In N.America, if operating on 240, both inputs will be above ground, if 120, one will be hot, one grounded neutral.
If used in Europe, to operate on 240, one lead will be neutral and referenced to ground.
Al.

[tauntdesigns]

Thanks Al,

I'll do some checking with the meter.

I'll report my findings.

Thanks for the reply,
Jack

[tauntdesigns]

I did some checking with a meter.

With the COM lead from my meter on the closest side of the fuse holder, with fuse installed. Both L1 and L2 are connected to the fuse.

I then checked again without the fuse installed.
COM lead on the nearest contact of the fuse holder, L2 is connected.
COM lead on the back fuse holder contact, L1 is connected.

Looking at the board trace, L2 goes straight to the fuse holder.

Cheers,
Jack

[Al_The_Man]

I did some checking with a meter.

With the COM lead from my meter on the closest side of the fuse holder, with fuse installed. Both L1 and L2 are connected to the fuse.

The reason for that reading is you were reading through the primary of the transformer which is very low resistance, so you would need a meter able to indicate the difference.
Al.