Geeetech

Hi.
I have a GT2560 Rev A + built in with a 12V 30A power supply.
2 extruders and one bed.
The extruders are heated extremely fast. I think that's very good. But the bed just makes it to 70 degrees. If I want to heat it higher, then an error appears. I've tried PID autoleveling, but even in autoleveling mode, it does not make it to 90 degrees. Then I also noticed that the Mosphet gets very hot. Therefore, I have a large aluminum plate installed so that the Mosphet does not burn. The bed has 1.2 ohms.
When I connect the bed to the 12V power supply, the bed easily reaches 90 degrees. I could install a relay, but is my Mosphet broken?

sorry for google translate.10.0.0.0.1 192.168.1.254 hotmail.com

Hello.

Check the entire power circuit of the heated bed thoroughly.
Check everything carefully for short circuits.

The MOSFET transistor heats up when more than the nominal current flows through it.

I had a similar problem a couple of years back with my I3Pro C, and decided to use a 12V relay to power the bed. The only limit is the power supply. I have used this method on all of the printers that i have had since then because i do not have to worry about overloading the motherboard.