Hey, I just got my 24v PSU installed and I wired it directly to my heated bed.

Originally, through my ramps at 12v, the bed took 13 min 50 seconds to get to 110C and would not sustain that temperature. I took all necessary steps to convert to a dedicated 24v PSU to run the MK3 on the 24v circuit. I measured the resistance of the 24V circuit and it was around 5.4 ohms.

I hooked my PSU directly to my heated bed, bypassing my ramps, just to see how fast I could get it to warm up. It is taken longer then the 12v through the ramps. What is going on? I soldered all connections, use heavy gauge high strand cable and for this test I am not even running it through a relay. I am completely puzzled.

Well, considering it is 5.4 ohms, thats only 104 watts. So, what should I do to put down more power. Can I run the 24v through the 12V circuit in the bed? Or if that seems too high, how about 16 or 18v through the 12v circuit in the bed? I am unsure what is causing the 24v circuit to be a flop, any help is appreciated.

Thank you,