Can I bridge my twin output Trans former ? Video Question

[GTRClive]

Hi I bought a 72volt 1440W 20 amp PSU only to fin when it arrived thats its actually a twin 10amp unit not a single 20amp. My question is can I parallel up the + and -ve to a single point so I can power my 3 Gecko 203v drives connected to my three 6 amp motors...
Here's a video to show you what I have ...

http://www.youtube.com/watch?v=dsHKtxuuIfY&feature=autoplay&list=UUkqX3uMKLeoBRZz5bypNzjQ&lf=plcp&playnext=1]Miller upgrade needed - YouTube

I'm not a DC expert so need help ....

Cheers

Clive

[Al_The_Man]

Are they switching supplies or linear?
Some switching supplies can be a bit finicky when paralleling.
Al.

[Al_The_Man]

You could always put one PS on the Y as this is usually the axis that bears the most load, and use the other for the X & Z.
Al.

[GTRClive]

No there not switched bud..

and its on my Shiz Knee mill so both the X and Y have High loads... z not so much

[Al_The_Man]

Are they Anatec by any chance? Linear can usually be paralleled up at either the AC side or the DC, the AC side however has to be done with caution to phase the windings.
As long as they are a matched pair it should not be a problem.
Al.

[GTRClive]

Ooops seems I posted the wrong link......

http://www.youtube.com/watch?v=C2Xj-a13vug&list=UUkqX3uMKLeoBRZz5bypNzjQ&index=1&feature=plcp]Question on transformers ??? - YouTube

[GTRClive]

Keling KL-7220

Switching Power Supply

Not thought of it before but yes the Y has the most weight to move around, but it seems my X axis is the one thats loosing steps at present..

[Al_The_Man]

I have paralleled power supplies on many occasions. Both on the DC side and the AC side.
Typically these transformers that have dual windings are OK to parallel the AC as long as the windings were put on Bifilar, this means wound together rather than one first then the second.
I am assuming that because they are essentially identical supplies they will in fact be wound bifilar.
This is also done on the primary and why you can parallel them.
The easiest way to is to parallel the DC side, measure both first to see if they are in fact close withing a volt or two..
If you want to play it really safe, parallel the -v terminals and place a 1k resistor from one + to the other, measure the voltage across the resistor, if low or unreadable then it is should be safe to go ahead and connect the two +v terminals.
Al.

[GTRClive]

Thank you sir your a Star.....

[Al_The_Man]

One comforting thought is that if anything does go wrong on a linear supply, it is usually very easily fixable, unlike a switcher that is often a throw-away.
Al.