power supply

HI


i got a new pc power supply a ATX 2 450 watt

the one before 350 watts works great ' im trying to heat the bed faster . =)

when im trying to heat up my bed no problem but when im turing on the extruder the heat bed

stop working !??

i was connection all yellow wire toghter - 7 wires
black wire 7 wire bundle ?
sense wire connect as well

i read somthing about pmw is their a way to deal with that i dont now in this pc power supply have this thing ?

is their a way to know that ?

any suggestions please ??

thank you for helping

sounds like you have a short, use a multimeter to check the resistance

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[mike-mack.blogspot.com]

HI

thank you helping =)

i dont have a problem with my other poer supply .

could it be a wrong connection that i did on the new power supply

i have coonect all the 12 -1 to one bundle and ignured the 12v - 2 only one wire.... could it be that one

what about to even the load between the 12 v rail and the 5 volt rail ??

regards

elidor

I don't know how many times I have to say this in these forums.

PC PSUs WILL NOT WORK PROPERLY WITHOUT A LOAD ON THE 5V RAIL.

Use a 10R power resistor or a 12V car brake light bulb, or similar. I.e. about 0.5A and it will get hot.

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[www.hydraraptor.blogspot.com]

HI nophead

respect hearing from you =)


thanks alot ill do that .


elidor

I've seen PC PSU's that require as much as a 2A load on the 5V line to get a consistent 12V from the 12V line.
They're not worth the effort IMO unless you have specific knowledge it will work without a load and some do.

Elidor Wrote:
-------------------------------------------------------
> HI
>
>
> i got a new pc power supply a ATX 2 450 watt
>
> the one before 350 watts works great ' im trying
> to heat the bed faster . =)

What kind of heat be do you have?
350 watts should be plenty. If your looking to heat your bed faster you'll need to increase voltage. PCB heatbeds can safely have their voltage increased in my experience. I've run mine at 19v without any problems. Keep in mind your bed will draw more power at higher voltages. I've been using a 120 watt universal laptop adapter-[www.amazon.com]
don't set it above 19v or less if you heatbed has less resistance than mine (prusa mk1 heatbed). I tried 20v and the adapter stoped working. To much draw.

This is pc psu I use-[www.amazon.com]
It works fine without a load on the 5v rail. I just put a jumper on the green and black wire on the 20 pin connector.

Hi

thank you all =)

so i have a ressistor 10 ohms 5 watt

is this will do the work to get 0.5 amp load on 5 volt rail

thanks

Yes. It will get very hot so be careful not to touch it.

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[www.hydraraptor.blogspot.com]

Hi nophead


great...... thank you alot =)