heat bed stops the print (1 reply)

Hi All.

i have this problem with my delta printer i just finish
hope someone can help me.

i am using marlin 1.1.4

when i slice a model with no heated bed it prints ok with PLA 210 hot end ( with the warping usual problems )
but when i slice the same model with the heated bed ( 60 degrees ).
it stops and gives me a thermalrunaway message.
and the power supply ( 12v DC 30A 360w ) was geting kind of hot, the fans on it went on and it feels like the power supply
was working a lot.

i bought a MOSFET for the 3d printer bed and a separate power supply just to feed the bed mosfet
and now the main power supply works great, no heating or heavy working on it, and the second power supply
heats the bed ok, slow but ok.

the thing is that when i try to print with the hot bed it still stops and gives me the
thermalrunaway error early in the print, even in a calibration cube.

and if pritn with out heat bed the printer works fine.

please help me.

Regards
Roberto