Dual rail 24vdc psu needed, cant find anywhere

[darrene666]

Hi im trying to find a dual rail +/-24v 50w ac to dc switched PSU for a set of hightspeed galvos as mine has decided to give up the ghost, i have checked the fuses on the unit and tryed firing up with out the galvo driver boards connected and still nothing so need a new one but have spent days looking but cant find one, any suggestions appreciated

[gottaluvlasers]

best bet is to get (2) 24V supplies and wire them for +/-

Thats what most do for bi-polar supplies these days.

Other than that it is "Power One" they make a dual supply. However it is open frame and HUGE. Chinese "heng fui" or something like that, make a +/-24V however they suck and are only about 1A or so.
There are a couple others that pop up here and there, but i would suggest just doing (2) 24v supplies

-Marc

[darrene666]

so to set up with 2No power supplies how would that be connected, wires to galvo drivers are 3wire +24 0 -24, so would i connect the two negatives together on the two psu's and +24 to one psu's + and the -24 to the other psu's +, and this shouldn't affect the drivers being connected like this?

[buffo]

would i connect the two negatives together on the two psu's

No. That won't work.

First you need to be sure that the output of the two DC power supplies are isolated from ground. Most are, but check to be sure. Use a multimeter and make sure you do NOT have continuity between the AC ground terminal on the input of the PSU and either one of the DC outputs. (Some PUS's have a wire connecting the negative terminal to ground, and if both PSU's have this, you can't connect them correctly to build a dual-rail PSU.)

Assuming the outputs are isolated from ground, you connect the positive output from one PSU to the negative output from the other, forming a new ground plane. This leaves you with a single positive output (which will be your +24VDC source), a single negative output (which will be your -24VDC source), and the connection between the two PSU's, which will be your new DC ground.

This new ground point should be connected to the other grounds in your system, and also to the incoming AC ground.

Adam

[kecked]

Think of stacking two batteries on top of ech other and call the point between them as ground. Then the anode of the top battery is the positive side and the cathode side is the negative side. When I say positive or egative I'm referencing it to the point between the batteries that we are chosing to call ground. If you don't tie ALL the grounds in your system to this center point called ground you can have all kinds of hard to figure out problems. Think it out and you'll be fine. Now to do this with two supplies just treat them like the batteries.

[LaNeK779]

some additional thoughts here http://www.photonlexicon.com/forums/...lts-for-galvos

[darrene666]

both psu's turned up today and got them fitted this evening, all working and back to normal, cheers for the help guys much appreciated, also treated myself to Quickshow as was using ishow before, my god is there's a hell of a difference ishow is deffinately crap!!!!!!! and i just thought i had built a shit laser but oh no it looks amazing now ive actually got some decent software/DAC running it