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    Heated bed 2500 Watt + Duet3 6hc

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    Duet Hardware and wiring
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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      Can you give more specifics and details?

      Connecting an AC bed heater via SSR is quite straight forward. You connect the SSR input to the normal bed terminals and wire the bed and ac power accordingly.

      Z-Bot CoreXY Build | Thingiverse Profile

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      • dc42undefined
        dc42 administrators
        last edited by

        @barbarossa-cologne, have you read https://duet3d.dozuki.com/Wiki/Choosing_a_bed_heater#Section_Bed_heater_driven_using_a_Solid_State_Relay ?

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

        duttiundefined 1 Reply Last reply Reply Quote 1
        • duttiundefined
          dutti @dc42
          last edited by

          @dc42 yes, but for me it's not easy. It's my first project. Like I understood I have to connect the state relay between the mainboard and the heated bed. But I'm not pretty sure how to wire this exactly.

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          • duttiundefined
            dutti @Phaedrux
            last edited by

            @Phaedrux what details do you need exactly?
            Power supply?

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            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              Does a diagram help?

              https://forum.duet3d.com/assets/uploads/files/1565106228661-xyyknu7.jpg

              What type of SSR is it?
              What is the heated bed?
              What is your PSU?
              How do you have things wired currently if at all?

              Z-Bot CoreXY Build | Thingiverse Profile

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              • duttiundefined
                dutti @Phaedrux
                last edited by

                @Phaedrux
                SSR: Type: ZG3NC-240B
                Input: 3-32VDC
                Output: 40A 30-240VAC

                Silicon Heater: 85x85cm - 2500watt

                RSU: Meanwell SNT HRP 600 24: 640 W, 24 V, 27 A

                I havent wired yet. I´m a bit scared to destroy the expansiv mainboard.
                Thanks for the help.!

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                • duttiundefined
                  dutti @Phaedrux
                  last edited by dutti

                  @Phaedrux the diagramm is very good!!
                  the only thing I´m confused about is the power switch beetween RSU and the electronic. Is it also possible to have the power switch between socket and RSU?
                  Where Do I have to connect the cable in the Duet3? At the 15a high current in and output?
                  thanks

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                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Wiring_Diagram

                    Yes Out0 would be the normal candidate for the bed heater due to it's 15a capacity, but since you're using an SSR you could use any of the output pins to drive it.

                    https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview#Section_Heating_Fans

                    Z-Bot CoreXY Build | Thingiverse Profile

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                    • duttiundefined
                      dutti
                      last edited by

                      @Phaedrux RSU has 27a and the SSR40a. Is this a problem?'
                      Or must be the current of the SSR less than the RSU..?
                      thanks

                      theruttmeisterundefined 1 Reply Last reply Reply Quote 0
                      • Phaedruxundefined
                        Phaedrux Moderator
                        last edited by

                        The SSR rating is just for it's max capacity, not what it draws or anything like that.

                        What are the specs of your heater?

                        Z-Bot CoreXY Build | Thingiverse Profile

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                        • duttiundefined
                          dutti
                          last edited by

                          @Phaedrux 85x85cm silicon heater
                          2500watt

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                          • Phaedruxundefined
                            Phaedrux Moderator
                            last edited by Phaedrux

                            What is your regional ac voltage? 110 or 220?

                            110 would be ~22a current
                            220 would be ~11a

                            Z-Bot CoreXY Build | Thingiverse Profile

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                            • theruttmeisterundefined
                              theruttmeister @dutti
                              last edited by

                              @barbarossa-cologne

                              I think you mean PSU,

                              The PSU has a rating for the amount of power it can supply. The SSR is just a switch, but its rating is like a wire, how much current it can carry.

                              The PSU and SSR are doing separate things, they just happen to use the same measurements (Amps).

                              Your bed heater will draw ~11 amps (I'm assuming you are in Europe based on your username) with the 220V from the wall, the SSR can carry a lot more (which is good, because the rating on SSR's is often over optimistic) (@Phaedrux I think got those numbers reversed).

                              The PSU can supply 27 amps, but that is at the 24 volts its putting out, its not being used to power the heater.

                              One thing to keep in mind, if you do something crazy, like max out the PSU by using it to drive an extra heater or a heated chamber... The combined power requirement would be over 3000 watts.
                              That would be more than is safe on a normal European wall plug (they are normally 13A max).

                              Isolate, substitute, verify.

                              Phaedruxundefined 1 Reply Last reply Reply Quote 0
                              • duttiundefined
                                dutti
                                last edited by dutti

                                @theruttmeister
                                yes, of course PSU. sry
                                Rigth. I´m in cologne. So it´s 220v.
                                So when I understand it rigth, I should buy a second power supply with more volts for connecting the SSR and the heater?

                                thanks for the explanation

                                dc42undefined 1 Reply Last reply Reply Quote 0
                                • Phaedruxundefined
                                  Phaedrux Moderator @theruttmeister
                                  last edited by

                                  @theruttmeister said in Heated bed 2500 Watt + Duet3 6hc:

                                  @Phaedrux I think got those numbers reversed).

                                  Yup I did, sorry.

                                  Z-Bot CoreXY Build | Thingiverse Profile

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                                  • dc42undefined
                                    dc42 administrators @dutti
                                    last edited by dc42

                                    @barbarossa-cologne said in Heated bed 2500 Watt + Duet3 6hc:

                                    @theruttmeister
                                    yes, of course PSU. sry
                                    Rigth. I´m in cologne. So it´s 220v.
                                    So when I understand it rigth, I should buy a second power supply with more volts for connecting the SSR and the heater?

                                    Is it a 220V AC bed heater? If it is, then you don't need a PSU for it. If it isn't, then you have the wrong SSR and we need to know what voltage it is.

                                    Tom Sanladerer posted a video on using SSRs to control AC mains bed heaters here https://www.youtube.com/watch?v=TiEwNf1H_Tc.

                                    Duet WiFi hardware designer and firmware engineer
                                    Please do not ask me for Duet support via PM or email, use the forum
                                    http://www.escher3d.com, https://miscsolutions.wordpress.com

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                                    • duttiundefined
                                      dutti @dc42
                                      last edited by dutti

                                      This post is deleted!
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                                      • duttiundefined
                                        dutti
                                        last edited by

                                        correct?

                                        theruttmeisterundefined 1 Reply Last reply Reply Quote 0
                                        • theruttmeisterundefined
                                          theruttmeister @dutti
                                          last edited by

                                          @barbarossa-cologne

                                          An SSR is just a switch. The control side only needs to be 24V (actually anything from 3-48V is common, the SSR will be marked), the PSU is powering just the switching of the SSR, which uses a very small amount of power.
                                          The whole point of using an SSR is that the other side of the switch can be for much higher voltages and can carry lots of current.

                                          So your wall socket can supply up to 13A, your SSR can carry 25A and the bed only draws 11A. Everything is good.

                                          The PSU is not powering the bed in any way at all. Its just controlling the switch.

                                          Isolate, substitute, verify.

                                          duttiundefined 1 Reply Last reply Reply Quote 1
                                          • duttiundefined
                                            dutti @theruttmeister
                                            last edited by

                                            @dc42
                                            It's a 220v heater.
                                            Thanks for the video link.
                                            I think @theruttmeister
                                            thanks a lot
                                            It's working but heating up needs a lot of time. How can I change this?
                                            23 to 60 degree needs 10 or more minutes
                                            Thanks

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