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RAMPS and xbox power supply

Posted by kenneth kneebone 
RAMPS and xbox power supply
May 12, 2015 01:22PM
i have an old 203watt xbox power supply because that seems to be what many people were using to power ramps electronics, and have read a bunch of people's tutorials or wiring diagrams but would like to check with you guys.
this blog:
has a wiring guide but seems to miss out which screw terminals go where,- or maybe he says to put them only in the 11amp terminals from this photo-

there is no heated printbed to power, will this power the 5 motors and not damage anything?
it has 12 volts,will the board just draw the necessary current for what it needs?
open | download - psu.jpg (565.3 KB)
Re: RAMPS and xbox power supply
May 12, 2015 02:37PM
The way you have it wired in your photo is fine although the two terminals further from the corner aren't necessary since you don't have a heated bed. The terminals closest to the corner is fused at 5 amps and normally will draw about that, or about 60 watts so you should be fine. If you decide to get a heated bed in the future, depending on your bed's resistance (suppose to be 1.0-1.2 omhs) you'll be right at the maximum of your power supply.

If you want to use the RAMPS board to control your power supply via the M80/M81 commands, you'll need to jump through some hoops with a relay to switch the red and blue wires together to turn on the power supply to full power.
Re: RAMPS and xbox power supply
May 14, 2015 10:59AM
ok thankyou
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