Problem with PSU!

[HighDangerr]

I am making a 3D printer on school. It is a Delta version.

The problem is the psu shuts itself down when the heated bed wants to keep it on 55 degrees. and i can't figure it out what the problem is.
specs:
Rambo Board
450 watt psu
200mm Heated bed.

Can someone help me with this problem?

[Eaglezsoar]

I am making a 3D printer on school. It is a Delta version.

The problem is the psu shuts itself down when the heated bed wants to keep it on 55 degrees. and i can't figure it out what the problem is.
specs:
Rambo Board
450 watt psu
200mm Heated bed.

Can someone help me with this problem?

It really sounds like a bad power supply, it can't supply the needed current.

[Xenocrates]

What voltage is the PSU rated for, and what is it actually delivering (both are relevant, as if the two are particularly different, it may just be a crap supply, rather than an undersized one), as well as the resistance of the bed. I'm hoping you have a multimeter, and know something about how to use it. Once you know those things, try to pick up a power resistor (not a small one mind you) that will be able to dissipate the appropriate amount of power given it's resistance versus the wattage of the power supply as partially a dummy load, and partially to limit the current the bed is drawing if the PSU will run it as a dummy load (this will reduce the power available to the bed, as you are limiting the current it can grab)

[Jrjones]

What firmware are you running?
Sounds like it could be this issue: http://forum.repetier.com/discussion/co ... mment_2125
I had a similar problem when I was still using an ATX PSU, setting
#define PDM_FOR_EXTRUDER 0
Worked for me