Hello,
I am currently using a RAMPS 1.4 (with Marlin 1.1.8) with an ATX PSU. The board is unmodified (12V input). While the extruder and the heatbed heat up (constant voltage on both outputs) everything works find. Once the final temperature is reached, the heating cartridge is quickly turned off and on again to keep the temperature stable (couple of Hz). The 12V output of the PSU seems to be stable during the whole process. Then after a random (but not to long) time the PSU shuts off. I already tried using a balancing load on the 5V rail. The fast switching of the heating cartridge seems to be the problem. Is there any way to lower the switching frequency or any other way to solve my problem? I already tried another PSU and it works flawlessly (but I need it for my PC). Both 12V rails of the failing PSU supply 18A so this should not be the problem.
I am currently using a RAMPS 1.4 (with Marlin 1.1.8) with an ATX PSU. The board is unmodified (12V input). While the extruder and the heatbed heat up (constant voltage on both outputs) everything works find. Once the final temperature is reached, the heating cartridge is quickly turned off and on again to keep the temperature stable (couple of Hz). The 12V output of the PSU seems to be stable during the whole process. Then after a random (but not to long) time the PSU shuts off. I already tried using a balancing load on the 5V rail. The fast switching of the heating cartridge seems to be the problem. Is there any way to lower the switching frequency or any other way to solve my problem? I already tried another PSU and it works flawlessly (but I need it for my PC). Both 12V rails of the failing PSU supply 18A so this should not be the problem.