Tried with a new powersupply that delivers 32 amps on 12v(measured)

Still the same, when the relay to the heated bed clicks on or off(not always on the first click), the printer freezes.

Tried running the heated bed on a seperate powersupply, isolating it completlety from the printer(i use a 3rd party temp controller for it too) Didnt help.

Im suspecting my mechanical relay for the bed causes some kind of noise when it turns on or off, will a solid state relay cause less noise?(not audible noise lol)

carl_m1968 wrote:

You need to get a dedicated 12 volt only supply. Those ATX supplies are all mostly garbage and dont even do rated current. Which for most is 12 amps at most on the 12 volt rail. Thats not enough for a 200 watt bed. That bed will draw just over 16 amps while heating at 12 volts roughly. You need to invest in a couple of 30 amp supplies like these.

http://www.amazon.com/gp/aw/d/B00LIBRKQ … amp+supply

This is exactly right.  I've seen this using ATX supplies for other things as well.  Even when they don't shut down, they sag a LOT under load, I have a 250W microATX power supply running a 50W radio and it sags to 11V regularly.

Getting a proper 12V supply such as the one linked above is one idea, alternatively you could use a modified SERVER power supply which is a popular option in R/C groups for cheap high current 12V power that is designed to run most/all of the power on the 12V rail.
http://www.rcgroups.com/forums/showthread.php?t=1292514

I have one of those that is a 75 amp running my mini kossel printer.

You need to get a dedicated 12 volt only supply. Those ATX supplies are all mostly garbage and dont even do rated current. Which for most is 12 amps at most on the 12 volt rail. Thats not enough for a 200 watt bed. That bed will draw just over 16 amps while heating at 12 volts roughly. You need to invest in a couple of 30 amp supplies like these.

http://www.amazon.com/gp/aw/d/B00LIBRKQ … amp+supply

This is exactly right.  I've seen this using ATX supplies for other things as well.  Even when they don't shut down, they sag a LOT under load, I have a 250W microATX power supply running a 50W radio and it sags to 11V regularly.

Getting a proper 12V supply such as the one linked above is one idea, alternatively you could use a modified SERVER power supply which is a popular option in R/C groups for cheap high current 12V power that is designed to run most/all of the power on the 12V rail.
http://www.rcgroups.com/forums/showthread.php?t=1292514

http://www.amazon.com/gp/aw/d/B00LIBRKQ … amp+supply

experiencing some problems with my printer, or ive had problems for 1 year, but not being able to solve them.

It all started when my heated bed wouldnt heat anymore, there is no power coming out of the bed-port on the board.

I bought a 200w replacement and hooked it up to a 350w ATX powersupply, i also hooked up the rest of the printer to a seperate 350w atx supply.

When printing, it all of a sudden stops when i get a small powerspike, if the heated bed turns on/off, (im using a temperature controller and a relay, so i hear it clicks, and then it stops)

Ive tried hooking it up to a UPS, but that doesnt seem to help.

Any other options? I would like not to change to ramps/rumba not just yet.