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I can't get my ATX power supply to work

Posted by dominsch

dominsch

I can't get my ATX power supply to work
September 06, 2015 07:15AM

Registered: 8 years ago
Posts: 10

I got myself a new psu to use with my heatbed. It can power the electronics but when I try to use a stepper motor or a heat element it turns off immediately. The only thing I've done so far is to connect the green wire to ground. Can you tell me what I'm doing wrong?

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dc42

Re: I can't get my ATX power supply to work
September 06, 2015 08:25AM

Registered: 10 years ago
Posts: 14,672

You need to put a dummy load on at least the main 5V output of the PSU and perhaps the 3.3V rail as well. Otherwise the voltage on those rails will rise when you load the 12V rail, and the over-voltage circuit in the PSU will trip. See [reprap.org].

Edited 1 time(s). Last edit at 09/06/2015 08:25AM by dc42.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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dominsch

Re: I can't get my ATX power supply to work
September 26, 2015 03:25PM

Registered: 8 years ago
Posts: 10

Ok, after trying lots of different things I accidently found a solution. I had to connect 3.3VS to +3.3V. That's it. Maybe this helps someone...