Wiring diagram for my new coreXY



  • Hi everybody, I’m new here.

    I’m designing my personal 3D printer, a core XY with 500x300x250 mm volume and I choose the duet 2 wi-fi as mobo. Also I did by my own the wiring diagram and, since I’m not an expert, I would really like your opinion (I’m quite scared by electricity, I hope not to burn anything). If you don’t get something by the attached drawings, feel free to ask.

    From what I understood studying the duet I thought so the scheme: one PSU 600/700 W to feed the hot bed, AC, and in between there’s an SSR to let it be turned on/off by the duet. Another PSU, 150W, will feed the duet itself, and all electronics connected to it (hot end, stepper motor, end stops ...). As far I understood the duet, there are two circuit on the board: one is for the wi-fi, chip, 5V and the second one that feed everything that is connected to it (driver, hot end ...), 24V. So my idea was to continuously feeding the 5V using the 600W PSU so the wifi is always on and using another SSR that turn on/off the 24V by opening/ closing the circuit with the second PSU. In this way if I connect to the board trough wifi, it can be always “on” (with low consumption), I can turn on the remaining components (and if needed the heated bed).

    Hope everything is fine, if you have advice/ correction I’m here

    Thank in advance !

    F51B1120-0695-4AFF-BA1D-A23D5FB7FC15.jpeg



  • @NonnoGio98 the bed heater is AC? In that case you don’t need a separate Dc power supply for it.



  • There is a fundamental error in your thinking.
    Running the Duet on a single power supply is the usual route. You do not need a seperate power supply for 5V unless you have a specific reason to do so.
    I would suggest you use a single 24V supply of sufficient power to run your heaters and the duet (including the bed heater that is 12/24V as per your pic).
    As pointed out, you do not need an ssr for the bed heater.
    I would suggest you loose the second ssr as well since you only have a single power supply.

    Edit: The needed 5V is generated internally on the Duet off the 24V supply



  • Hi,

    I would use a Keenovo Silicone Bed Heater rated for use with 120 VAC and control it with an SSR.

    Then a single power supply for everything else.

    Frederick



  • @NonnoGio98 You only need to use a single dc supply (usually 24V or 12V on the Duet Wifi). You can supply this direct into the board and the internal regulator will provide the 3.3V & 5V it needs to work. The board then in-turn supplies the 24V to the motors, heater, bed etc.

    However, you can deviate from this if needed/desired. Most common deviation is to power the bed separately, either because it is a mains AC bed (as you suggest?), or it is a 12/24V bed that draws more than the Duet's bed heater channel can cope with (I believe it's 15A..?). You then use the bed output to control an SSR (for AC beds) or a larger external mosfet. From what I can see you have got this right. However, I am confused why you have the 600W power supply? If the bed requires 600W AC, you don't need a power supply - mains power comes in from the mains. As it is, the bed wiring will work, but you don't need the 600W PSU and can put the Live staight into the SSR and the Neutral straight to the bed.

    Another deviation which is sometimes done is to use an additional 5V PSU. In this case you would put the 5V supply to the 5V and GND pins next to PS_ON. Note that this is a 5V input. Using the separate 5V supply then means you can turn off the 24V supply to disable the motors, heaters etc (e.g. from an E-stop) whilst still being able to access the Duet to see what went wrong etc. I do this on my printer. I also use the PS_ON pin to drive a relay on the 24V supplies, meaning that the Duet can shut down the power if it detects a fault. I believe this is what you are attempting to do? I'm confused why you'd have a 600W 5Vdc supply? Mine is 7.5W and I use it to power a a couple of other bits at the same time too... However, in principle, if it is a 5V supply, it will work as you currently have it.
    Note that the PS_ON doesn't require the separate 5V supply, but you need some way of powering the Duet at boot (usually done by momentary switch), so that it can then send the M80 command to activate the PS_ON pin and turn on the relay/SSR

    Hope that helps 🙂



  • @fcwilt said in Wiring diagram for my new coreXY:

    Hi,

    I would use a Lenovo Silicone Bed Heater rated for use with 120 VAC and control it with an SSR.

    Then a single power supply for everything else.

    Frederick

    I take it auto correct bit you in the ass..

    I think it should read "keenovo"



  • @CaLviNx said in Wiring diagram for my new coreXY:

    @fcwilt said in Wiring diagram for my new coreXY:

    Hi,

    I would use a Lenovo Silicone Bed Heater rated for use with 120 VAC and control it with an SSR.

    Then a single power supply for everything else.

    Frederick

    I take it auto correct bit you in the ass..

    I think it should read "keenovo"

    Thanks for catching that.

    Frederick


Log in to reply