Im having some bad luck but with ATX PSU’s. It seems they dont like PWM pulsing?
I was using a noname 800W PSU that at the same time powered my printer and a home theatre pc thats always on, it ran for a year with no problems.
When I moved the printer to another room, I took the PSU with it, so it only powered the printer (and an old cdrom I added to have something on the 5V, just in case). Within a few hours of printing the PSU died. When disconnected, the PSU still turns on, provides 12V, but the moment I connect any load (even the cd rom), it powers itself off.
So I got another PSU I had laying around as spare, this time an Antec 550W trio (3x 18A on 12V). Within less than an hour of printing, the exact same thing happened with the exact same symptom: psu runs, until you load it, then it shuts off. Funny that?
For the record Im using an E3D hotend thats designed for 40W@12V, edirol’s relay scheme to power a Mk I heatbed which pulls ~90W @12V. I intended to power it with 24V but didnt get around doing that yet.
Since it worked for so long when it also powered a PC, could it be these ATX PSU’s dont like pulsing between high and virtually no load? Or do I need a larger load on the 5V?
edit: looks I spoke too soon. When I hook up an old harddrive to the Antec, it seems to work. Cant test properly as I butchered my thermistor, will report back.