Q: AC-DC Power Supply

Electronics related to CNC

Q: AC-DC Power Supply

Postby nephertiti » Fri Dec 14, 2012 5:21 pm

Hello, I just started Buildlog 2.x Laser. Looks I bought everything except DC Power Supply.

So here is electronics I bought:

LO DSP DC 12~36V,1.5A
LINK: http://www.lightobject.com/2012-Commercial-DSP-CO2-Laser-Engraving-Cutter-Controller-Support-CorelDraw-AutoCad-P321.aspx

Step Drivers Voltage: Min 20V Typical: 36V Max: 50V DC
LINK: http://www.lightobject.com/2-Phase-45A-1-axis-Stepping-Motor-Driver-Support-to-Nema-1634-Leetro-replacement-P453.aspx

Water Pump DC24V
LINK: http://www.lightobject.com/108Lm-171GPH-Small-DC24V-Brushless-Submersible-Water-oil-Pump-P575.aspx

Emergency Push Button Switch with lock AC 120V/6A, 250V 3A or DC24V 3A
LINK: http://www.lightobject.com/Emergency-Push-Button-Switch-with-lock-P534.aspx

Fan DC12V
LINK: http://www.lightobject.com/Ultra-Strong-12cm-DC12V-Cooling-fan-200CFM-P605.aspx


Here is info about Power supply I found.

Model: A-350-24
24V 12.5A
http://cl-power.com/en/products_show.asp?ID=1060


So there is a small problem , all other devices except fans can be work with 24V but fans 12V so what can I do about that?

Thank you.
nephertiti
 
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Re: Q: AC-DC Power Supply

Postby cvoinescu » Fri Dec 14, 2012 9:49 pm

Depending on what amount of 12 V power you need, a DC/DC converter like this one may be more convenient than a second power supply.
cvoinescu
 
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Re: Q: AC-DC Power Supply

Postby nephertiti » Sat Dec 15, 2012 1:38 am

cvoinescu wrote:Depending on what amount of 12 V power you need, a DC/DC converter like this one may be more convenient than a second power supply.


Here is info about Fan

Power: DC12V
Current: 1.8A (3A max)
Watt: 36watt
Fan size: 12cm
Flow rate: 200CFM

I will use two of these so Can i serial connect 2 fans and connect to 24V line?
nephertiti
 
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Re: Q: AC-DC Power Supply

Postby cvoinescu » Sat Dec 15, 2012 2:25 am

Not a good idea to connect fans in series. Their impedance varies, so one fan can get more than 12 V and the other one less. If you accidentally stop one fan, the voltage drop on it will decrease, and the other fan may get as much as 20 V. That can even happen when they start: if one is a little slower to start, the voltage on it drops and it may stall, again subjecting the other one to more than half the supply voltage.

If you have only one such fan to supply, that item I pointed you to should be just right; for two fans, you can easily afford one for each fan. :)
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Re: Q: AC-DC Power Supply

Postby nephertiti » Sat Dec 15, 2012 2:30 am

cvoinescu wrote:Not a good idea to connect fans in series. Their impedance varies, so one fan can get more than 12 V and the other one less. If you accidentally stop one fan, the voltage drop on it will decrease, and the other fan may get as much as 20 V. That can even happen when they start: if one is a little slower to start, the voltage on it drops and it may stall, again subjecting the other one to more than half the supply voltage.

If you have only one such fan to supply, that item I pointed you to should be just right; for two fans, you can easily afford one for each fan. :)


Ok I will do that by the way 24V will be enough for Step drivers and LO DSP? or is it better I use 36V power supply? I'm realy noob about electronic things :)

Thanks for helps.
nephertiti
 
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