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Problem with new power supply through mosfet

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    Problem with new power supply through mosfet

    I installed a mosfet for my hotbed on a Anet A8. The wiring is proper according to all diagrams Iíve seen, I added a seperate power supply just for that. 12V from the power supply is fine until I have the printer preheat, and then the hotbed power supply goes dead and stops sending current at all. If I shut everything off and try again, the power supply works, all the way until the printer tells it to heat the bed. The LED under the bed flickers and then goes off and the power supply shuts off again. On the mosfet, the red LED goes on when power is turned on, but then when the mother board sends a signal to heat, the blue LED goes on and the red one goes off.Any help or insight would be great, thanks in advance.

    #2
    You have two separate power supplies of 12 volt each one is just for the heater on the bed and nothing else . if you connect this power supply directly to the heatbed without the mosfet just the heater and power supply (no printer control needed) will it heat up without killing the supply. Do Not Leave This ON very Long.

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      #3
      Also can you post the wiring diagram as you have it hooked up.

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        #4
        Thanks Roger3D, I will test that tonight. The only difference between my wiring and what is online as proper wiring, is that I have 12v coming from two different power supplies.

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          #5
          OK, so now I removed the secondary PSU and went back to the original power supply, but using the mosfets for both the hot bed and the hot end. Now I can't get the hot end to get over 150F - I will try to remove the mosfets and go back to the original wiring that worked. Also, before that, I will pull the extruder off and check the connections at the heating block and transistor to be sure that is not part of the issue (it shouldn't be that, but I can't see it well).

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