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SSR stuck on???

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Duet Hardware and wiring
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  • undefined
    dc42 administrators @gnydick
    last edited by 30 Dec 2019, 11:54

    @gnydick said in SSR stuck on???:

    It's all wired correctly.

    How exactly have you wires the SSR to the Duet? Photo please.

    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

    undefined 1 Reply Last reply 30 Dec 2019, 18:50 Reply Quote 0
    • undefined
      gnydick @dc42
      last edited by 30 Dec 2019, 18:50

      @dc42 IMG_20191230_104512.jpg

      #1 to black wago
      #2 to bed loop eventually to white wago
      #3 bed pos
      #4 bed neg

      Behavior

      • Connected as is: bed turns on and stays on with heater off or on
      • #3 disconnected: bed stays off with heater off or on
      • #3 & #4 reversed: bed stays off with heater off or on
      1 Reply Last reply Reply Quote 0
      • undefined
        gnydick @DocTrucker
        last edited by 30 Dec 2019, 18:54

        @DocTrucker as soon as I disconnect the signal wires, the bed turns off.

        With them connected, the bed is always on, even if I turn the heater on, which would turn it off if my config was inverted, if I understand that correctly.

        1 Reply Last reply Reply Quote 0
        • undefined
          Phaedrux Moderator
          last edited by 30 Dec 2019, 19:06

          Can you pull the SD card entirely, disconnect the bed connector on the Duet, power on, and carefully check if there is VIN across the bed terminals?

          If yes, then that would indicate that the bed heater mosfet has failed on.

          If not, Insert the SD card and check again, if there is now VIN across the terminals, then that would indicate a configuration issue.

          Z-Bot CoreXY Build | Thingiverse Profile

          undefined 1 Reply Last reply 30 Dec 2019, 20:36 Reply Quote 0
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            gnydick @Phaedrux
            last edited by 30 Dec 2019, 20:36

            @Phaedrux do I just set my meter to low voltage and touch to both terminals directly?

            undefined 1 Reply Last reply 30 Dec 2019, 20:40 Reply Quote 0
            • undefined
              Phaedrux Moderator @gnydick
              last edited by 30 Dec 2019, 20:40

              @gnydick I'm not familiar with your particular meter, but yes you'd set it to DC voltage in the range that would register 24v accurately. Touch + to + and - to -. Careful not to short anything else.

              Z-Bot CoreXY Build | Thingiverse Profile

              undefined 2 Replies Last reply 30 Dec 2019, 20:45 Reply Quote 0
              • undefined
                gnydick @Phaedrux
                last edited by 30 Dec 2019, 20:45

                @Phaedrux yep, 24.1v 😞

                1 Reply Last reply Reply Quote 0
                • undefined
                  gnydick @Phaedrux
                  last edited by 30 Dec 2019, 20:47

                  @Phaedrux can I use a different connection to trigger the SSR while I wait for the replacement?

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                  • ?
                    A Former User
                    last edited by A Former User 30 Dec 2019, 20:48

                    If its not covered by warranty and you want to use the SSR anyway you might get away with soldering a wire from the gate on the bed FET and run that to the SSR input. (you may have to invert the output if you do)

                    Edit: sure, can def use any of the fan outputs instead.

                    undefined 1 Reply Last reply 30 Dec 2019, 20:50 Reply Quote 0
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                      gnydick @A Former User
                      last edited by 30 Dec 2019, 20:50

                      @bearer any pointers on how to set that up? Would I just wire two of the pwm pins to the SSR and map the bed heater to that pwm?

                      ? 1 Reply Last reply 30 Dec 2019, 20:55 Reply Quote 0
                      • undefined
                        Phaedrux Moderator
                        last edited by 30 Dec 2019, 20:50

                        Since the bed heater is being powered via SSR and the SSR input will accept lower voltage than VIN, you could use any other open heater or fan output with a little configuration.

                        If the Duet came with the RailCore kit I'd seek a warranty claim.

                        Z-Bot CoreXY Build | Thingiverse Profile

                        undefined 1 Reply Last reply 30 Dec 2019, 20:56 Reply Quote 0
                        • ?
                          A Former User @gnydick
                          last edited by 30 Dec 2019, 20:55

                          @gnydick said in SSR stuck on???:

                          @bearer any pointers on how to set that up? Would I just wire two of the pwm pins to the SSR and map the bed heater to that pwm?

                          i'd use the "ground" from a fan, that ground is pwm controlled by the duet and you can use any supply voltage, the one on the fan output is convenient though. then unmap the fan if needed and map the heater. I'm sure some of the wizzards can help with the config if needed

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                          • undefined
                            gnydick @Phaedrux
                            last edited by 30 Dec 2019, 20:56

                            @Phaedrux I am, but it will take time. I'd like to get everything else tested out while I wait.

                            undefined 1 Reply Last reply 30 Dec 2019, 21:01 Reply Quote 0
                            • undefined
                              dc42 administrators @gnydick
                              last edited by 30 Dec 2019, 21:01

                              You can also use a spare heater output on the Duet or the DueX5.

                              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

                              undefined 1 Reply Last reply 30 Dec 2019, 21:03 Reply Quote 0
                              • undefined
                                Phaedrux Moderator
                                last edited by 30 Dec 2019, 21:01

                                Here's the directions for using a chamber heater. It's the same principal. Using an alternate pin for controlling an extra heater. The only difference for you is that instead of defining a new heater 3, you'd be altering the configuration for heater 0 (the bed on duet 2)

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

                                Z-Bot CoreXY Build | Thingiverse Profile

                                undefined 1 Reply Last reply 30 Dec 2019, 21:02 Reply Quote 0
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                                  gnydick @Phaedrux
                                  last edited by 30 Dec 2019, 21:02

                                  @Phaedrux thanks

                                  1 Reply Last reply Reply Quote 0
                                  • undefined
                                    jens55
                                    last edited by 30 Dec 2019, 21:03

                                    It is highly unlikely that the SSR has failed since it is not stuck in the 'on' position. It is way more likely that there is a wiring error.
                                    Are you aware that the positive line will always be high no matter if the heater is on or off?
                                    Simply wiring the negative to ground will cause all these issues.
                                    Verify the ruting of the two control lines.

                                    1 Reply Last reply Reply Quote 2
                                    • undefined
                                      gnydick @dc42
                                      last edited by 30 Dec 2019, 21:03

                                      @dc42 do I remap a pin to H0 or do map a different heater to "bed"? I'm kinda lost as to which direction to go.

                                      undefined 1 Reply Last reply 30 Dec 2019, 21:08 Reply Quote 0
                                      • undefined
                                        dc42 administrators @gnydick
                                        last edited by 30 Dec 2019, 21:08

                                        @gnydick said in SSR stuck on???:

                                        @dc42 do I remap a pin to H0 or do map a different heater to "bed"? I'm kinda lost as to which direction to go.

                                        If you are using RRF2 then use a different heater number. Use M140 with an H parameter in config.g to tell the firmware which one.

                                        It's very usual to have a dud bed heater mosfet on a Duet. Is the bed heater LED on the Duet permanently illuminated too?

                                        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

                                        1 Reply Last reply Reply Quote 0
                                        • undefined
                                          whosrdaddy
                                          last edited by whosrdaddy 30 Dec 2019, 21:10

                                          @gnydick : If I look at your photo, I believe you made a wiring error, you have wires labeled "BED-SSR" connected to the VIN connector and wired VIN to the Bed output connector!!!! Please double check your wiring, diagrams can be found here

                                          undefined undefined 2 Replies Last reply 30 Dec 2019, 21:12 Reply Quote 1
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