Old 08-31-2015, 12:25 PM #1
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Default power supply +-24v.

Hi, friends.

I'm looking for a power supply for galvos (PT-30/PT-40). And I do not find any with the features this type of source. (+ 24v / common / -24V). Three cables (red / black / yellow) to power amplifiers galvo.
All I find are sources of 24v. But none with the possibility of + -24V using common as "neutral".


I tried searching even with the reference power supply manufacturer, but can not find any replacement.
Do you know where I could find a (reasonably priced) or could solve the problem with a similar source?


In case of not finding the correct power supply ... the diagram is correct, to connect two power supply 24v and get diferential of +/- 24V.?



Use two of these ...
Ground, can be common for AC 240V. and +/- 24v DC.?

http://es.aliexpress.com/item/AC-100...347045259.html

If correct this diagram ... with dual output power supply; more interesting for me because I use a source like this for galvos?

Can you help?

110-240V DC 12/24V Universal Regulated Switching Power Supply For LED Strip/CCTV | eBay

AC 240v.
24v DC.
5 Amp.
120 W.




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Old 08-31-2015, 04:24 PM #2
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Default Re: power supply +-24v.

Often you can use 2 units like that, but check first!

Most of them are isolated from the grounded metal frame around them, and it's no problem to hook them in series. Do make SURE that the negative output is not connected to the case (measure with multimeter) before powering things up, otherwise you will short one out.

You can find supplies with +24 and -24 in the same unit quite easily on ebay. Last time i got one that outputs 1 amp i think the price was $10-$15 shipped from china.

The 2x24v ones are hard to find, but it would be something like this Factory Direct CE RoHS D 30B 5V 24V Dual Output Power Switching Power Supply | eBay

You could ask a vendor of these things if they have one with -24 and +24.
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Old 08-31-2015, 05:19 PM #3
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Default Re: power supply +-24v.

Hello BenM.

Thank you for your help.

I could not find any power supply of +/- 24V. anywhere, or Ebay, or AliExpress ...
I contacted with Spacelas, but they do not send single units (one set of galvos).

I tried the model that I have (one double power supply) ... and the negative is not connected with the case, but the GROUND grounded network (240V AC.) A problem?

O earth AC disconnect and connect to galvos Ground?

I have this power supply is not connected with negative case (chassis).
This is the image of the power supply.






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Old 08-31-2015, 05:36 PM #4
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Default Re: power supply +-24v.

If power supply good for galvos... scheme is correct?



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Old 08-31-2015, 07:09 PM #5
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Default Re: power supply +-24v.

Doing that as above will short the PSU out .

That PSU is just a single +24V output
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Old 08-31-2015, 07:19 PM #6
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Default Re: power supply +-24v.

OK!
I imagined that is not dual structure is only double output connection.

I use two 24v PSU. separated.


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Old 09-10-2015, 03:34 AM #7
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Default Re: power supply +-24v.

Quote:
Originally Posted by juanma666 View Post
OK!
I imagined that is not dual structure is only double output connection.

I use two 24v PSU. separated.


Best Regards.
Juanma.
Correct me if im wrong but you cant have 2 switching psu's in seiries unless they are on electrically isolated sources?
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Old 09-10-2015, 09:33 AM #8
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Default Re: power supply +-24v.

I did this a few years back and used 2 of these. I connected the V+ of one to the V- of the other and used that pin as ground. I then use the V- as the -24V and the V+ as the +24V.

Here's a diagram of it but with 12V instead of 24V. For the full range of your galvos, you need 24V.


Last edited by Apocalypse; 09-10-2015 at 09:38 AM.
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Old 09-11-2015, 12:38 AM #9
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Default Re: power supply +-24v.

Quote:
Originally Posted by autonomousperson View Post
Correct me if im wrong but you cant have 2 switching psu's in seiries unless they are on electrically isolated sources?
The outputs are isolated from the inputs in these units, so you can.

You would be absolutely right if they connected ground to the negative output pin, but most of these switchmode PSU's don't do that. Ground is connected to the chassis, but the output voltage is isolated from that too.

Before proceeding you should verify this though, there are -some- supplies that do connect ground to output negative, although they are rare. If you cannot find a +/- 24v single unit, just get 24v ones and hook it up as drawn out, it will be fine for galvo's. It would be a good idea to adjust them to the exact same output voltage if they have an adjustment pot on them.
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Old 09-20-2015, 05:51 PM #10
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Default Re: power supply +-24v.

Hello friends.

It serves to galvos ?

If so ... where I connect (G ) common?


Aliexpress.com: Comprar 120 W 24 V 5A fuente de alimentación conmutada AC DC 100 ~ 240 V a doble salida DC 24 V convertidor de voltaje del transformador luz de tira de LED conductor de suministro de apoyo fiable proveedores en Qing Xin Ltd.


Best Regards .

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Old 09-21-2015, 12:38 AM #11
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Default Re: power supply +-24v.

Exactly as detailed in the very first post here.
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Old 09-21-2015, 04:50 PM #12
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Default Re: power supply +-24v.

Thank you!

Best Regards.
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