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    How to connect two 24V PSUs?

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    • cosmowaveundefined
      cosmowave @PaulHew
      last edited by

      @paulhew @o_lampe Yes for sure, a SSR would be the best option.

      Mankati FSXT+, DeltaTowerV2, E3D MS/TC

      Pickettundefined 1 Reply Last reply Reply Quote 0
      • fcwiltundefined
        fcwilt @o_lampe
        last edited by

        @o_lampe said in How to connect two 24V PSUs?:

        But I'm not sure how PID tuning would work then? Vin of the bed is unknown...

        Well on my printers I have 120 VAC bed heaters controlled by AC SSRs.

        PID works fine even though Vin is not used for heating.

        Frederick

        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

        1 Reply Last reply Reply Quote 0
        • Pickettundefined
          Pickett @cosmowave
          last edited by

          @cosmowave Hello may I join in and humbly ask if it is possible to power the silicone heater pad with a mosfet or does it need to be a SSR? Ive read that a SSR is a MOSFET in a fancier package? Ive got zero problems getting a good SSR cause Im planning on getting a 400mm X 400mm Silicne Heater Pad for my Anycubic Chiron 3.0 build powered by a D3M5+ of course so am curious as to what is the deal with the SSR vs the MOSFET for the purpses of heating the bed or nozzle for that matter. TIA!!!

          cosmowaveundefined o_lampeundefined 2 Replies Last reply Reply Quote 0
          • cosmowaveundefined
            cosmowave @Pickett
            last edited by

            @pickett You can power your bed with a suitable mosfet. That's possible.
            If you'd like to use a AC bed-heater then a SSR will switching allways at 0 volts. So you have no "switching peaks"
            Sorry, my english is not good enough to explain it better!

            Mankati FSXT+, DeltaTowerV2, E3D MS/TC

            1 Reply Last reply Reply Quote 0
            • o_lampeundefined
              o_lampe @Pickett
              last edited by

              @pickett If your heater needs higher voltage than the Duet3 is rated for, you need an external switcher.
              A dc/dc ssr is an array of Mosfet, but for AC you'd need an AC-SSR.

              Dougal1957undefined 1 Reply Last reply Reply Quote 0
              • Dougal1957undefined
                Dougal1957 @o_lampe
                last edited by

                @o_lampe said in How to connect two 24V PSUs?:

                @pickett If your heater needs higher voltage than the Duet3 is rated for, you need an external switcher.
                A dc/dc ssr is an array of Mosfet, but for AC you'd need an AC-SSR.

                You do need to be careful with DC-DC SSR's due to there on resistance (most of the cheaper ones use Triacs I think and tend to have a quite high Volts drop which leads too a lot of energy being lost in the SSR itself) IMHO a good Mosfet is the preferred for a DC bed and a Zero Crossing SSR for AC Beds.

                Pickettundefined 1 Reply Last reply Reply Quote 0
                • Pickettundefined
                  Pickett @Dougal1957
                  last edited by

                  @dougal1957 thanks sorry for the late reply as I had been really busy with the kids. Anywho I am seeing some Zero Crossing SSR's and I guess I need to educate myself a bit more on SSR's in general. Ive found one by Uxcell but it is only 12.95 USD which is definitely a good price and a lot of the reviews are great but if there is anything Ive learned about great reviews on Amazon doesnt always mean they are real but these do sound authentic from a lot of different users. Anyways the SSR I have spoken about is an DC to AC SSR as the Silicone Heater Pad Im going to buy is a 120v AC bed which I know will work terrificly and can hardly wait to get it as Im finishing up my build of my Anycubic Chiron with a Duet 3 Mini 5+ and other nice components though with most things in life there are even nicer components than the ones Ive got to be had but that is life I guess or me anyways always wanting something bigger and badder lols. So is the Zero Crossing SSR an AC to AC SSR?

                  Dougal1957undefined Phaedruxundefined 2 Replies Last reply Reply Quote 0
                  • Dougal1957undefined
                    Dougal1957 @Pickett
                    last edited by

                    @pickett zero crossing just means that it switches the AC output att the zero points of the wave form so it applies to any SSR that switches an AC Load (so DC-AC sir's) I have never seen a AC-AC one tbh not that that means they don't exist I just don't know.

                    Pickettundefined 1 Reply Last reply Reply Quote 1
                    • Phaedruxundefined
                      Phaedrux Moderator @Pickett
                      last edited by

                      @pickett said in How to connect two 24V PSUs?:

                      Ive found one by Uxcell but it is only 12.95 USD

                      I would say that is overpriced.

                      Take a look here: https://www.auberins.com/index.php?main_page=advanced_search_result&search_in_description=1&keyword=ssr

                      There is a range of AC and DC SSRs in a range of power ratings and they don't cost a fortune.

                      Z-Bot CoreXY Build | Thingiverse Profile

                      Pickettundefined 1 Reply Last reply Reply Quote 1
                      • Pickettundefined
                        Pickett @Dougal1957
                        last edited by

                        @dougal1957 yeah wow I guess an AC to AC SSR would be not only redundant but dumb lols "hey let me get a plate for my hamburger and a plate for the buns to sit on so I can eat a hamburger wrapped in wax papers lols!!!!!!!" ok ok sorry I didnt realize what I said til you said something lols its all good anyways ok thanks man I appreciate the bit of info I really do!!!!

                        1 Reply Last reply Reply Quote 0
                        • Pickettundefined
                          Pickett @Phaedrux
                          last edited by

                          @phaedrux thanks man Ill look into that and see what I can come up with over here in the US Market thank you though I really appreciate it I really do!!!!

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

                            @pickett said in How to connect two 24V PSUs?:

                            over here in the US Market

                            Auber Instruments is US based. Georgia I believe.

                            Z-Bot CoreXY Build | Thingiverse Profile

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                            • weed2allundefined
                              weed2all @o_lampe
                              last edited by

                              @o_lampe for a dc heatbed I would probably go for a external mosfet...this way you have a dedicated psu for your heatbed and a seccond psu for everything else...in any case I use alot this type of mosfet powering the heatbed just because is cheap ro buy 2 psu with lower watts(24v 350w) than to buy a bigger psu(24v 600/700w to meet all the power drain requirements)
                              https://m.banggood.com/3PCS-60+50mm-Hot-Bed-Power-Module-Expansion-MOS-Tube-For-3D-Printer-p-1272663.html?utm_source=googleshopping&utm_source=googleshopping&utm_medium=cpc_organic&utm_medium=cpc_bgs&gmcCountry=PT&utm_content=minha&utm_content=dcr&utm_campaign=minha-pt-en-mb&utm_campaign=dcr-ssc-pt-en-newcustom-ncv65-0720&currency=EUR&cur_warehouse=CN&createTmp=1&ad_id=534534084655&gclid=Cj0KCQjwkIGKBhCxARIsAINMioJpFBfRNwRKoGiy9kqHrrPNd-pPVbN9NGLfFDIM7ZsvrQiMCRCqv1AaAo1xEALw_wcB

                              https://www.thingiverse.com/weed2all/designs

                              1 Reply Last reply Reply Quote 1
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