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IMPORTANT ISSUE with bed temp controller

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  • undefined
    jrockland @dc42
    last edited by 14 Jan 2021, 18:17

    @dc42 on that specific machine we still use the old SRD-05VDC-SL-C, apparently we haven't blown them up yet. so no SSR'S on that one.

    problem is probably in my gcode.

    undefined 1 Reply Last reply 14 Jan 2021, 18:21 Reply Quote 0
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      Luke'sLaboratory @jrockland
      last edited by 14 Jan 2021, 18:21

      @jrockland said in IMPORTANT ISSUE with bed temp controller:

      SRD-05VDC-SL-C

      Oh - so its a mechanical switch you were trying to drive with PWM. Well, that about "solves" it, other than inverting the heater signal. Datasheet shows ratings for 300 electrical switches/min, with only 30 mechanical switches/min allowed.

      FWIW - this is why we always ask for the config.g when diagnosing issues.

      Luke
      http://lukeslab.online

      undefined 1 Reply Last reply 14 Jan 2021, 18:23 Reply Quote 0
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        Veti
        last edited by 14 Jan 2021, 18:23

        as i said not having a quality ssr gives you a good chance of burning down your house

        get some quality components like
        Omron G3NA-210B-DC5 (10A) or Crydom D2425 (25A) or Crydom 84134000 (10A) SSR

        undefined 1 Reply Last reply 14 Jan 2021, 18:26 Reply Quote 0
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          jrockland @Luke'sLaboratory
          last edited by 14 Jan 2021, 18:23

          @Luke-sLaboratory driving relays with io's isn't the right way ? pretty sure it is what there telling us to do in the wiring diagram.. I might be wrong..

          undefined undefined undefined 3 Replies Last reply 14 Jan 2021, 18:24 Reply Quote 0
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            Veti @jrockland
            last edited by 14 Jan 2021, 18:24

            @jrockland said in IMPORTANT ISSUE with bed temp controller:

            pretty sure it is what there telling us to do in the wiring diagram.. I might be wrong..

            what wiring diagram?

            1 Reply Last reply Reply Quote 0
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              Luke'sLaboratory @jrockland
              last edited by 14 Jan 2021, 18:26

              @jrockland IOs are fine, but you're trying to use a PWM signal (based on PID values) instead of a simple off/on. the mechanical relay can't keep up, and it may cause some other issues like latching on and causing the issue described. You'll need to re-enable Bang-bang, which will output either full voltage or none.

              Luke
              http://lukeslab.online

              undefined 2 Replies Last reply 14 Jan 2021, 18:27 Reply Quote 0
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                jrockland @Veti
                last edited by 14 Jan 2021, 18:26

                @Veti O don't worry for me, theses machines are intended to crash so they have fire extinguishing system in place. and I don't run them in my house.

                ever seen an axis with over 60lbs of torque crash ? parts goes flying XD

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                  jrockland @Luke'sLaboratory
                  last edited by 14 Jan 2021, 18:27

                  @Luke-sLaboratory That would explain why it was working before the update, bang bang was probably activated before...

                  I will try to find how to write it properly using bang bang.

                  1 Reply Last reply Reply Quote 0
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                    fcwilt @jrockland
                    last edited by fcwilt 14 Jan 2021, 18:28

                    This post is deleted!
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                      jrockland @Luke'sLaboratory
                      last edited by 14 Jan 2021, 18:28

                      @Luke-sLaboratory hmm wait if I look at my config file bang bang IS activated..

                      undefined 1 Reply Last reply 14 Jan 2021, 18:29 Reply Quote 0
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                        jrockland
                        last edited by 14 Jan 2021, 18:29

                        @fcwilt you where right (before deleting your comment) but my config was set as using bang bang..

                        undefined 1 Reply Last reply 14 Jan 2021, 18:30 Reply Quote 0
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                          fcwilt @jrockland
                          last edited by 14 Jan 2021, 18:29

                          @jrockland said in IMPORTANT ISSUE with bed temp controller:

                          @Luke-sLaboratory hmm wait if I look at my config file bang bang IS activated..

                          Even with the slow rate of "bang bank" a mechanical relay is not a good choice.

                          Frederick

                          undefined 1 Reply Last reply 14 Jan 2021, 18:34 Reply Quote 0
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                            fcwilt @jrockland
                            last edited by 14 Jan 2021, 18:30

                            @jrockland said in IMPORTANT ISSUE with bed temp controller:

                            @fcwilt you where right (before deleting your comment) but my config was set as using bang bang..

                            I saw that someone had already mentioned that issue so I tried to delete mine.

                            Frederick

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                              jrockland @fcwilt
                              last edited by 14 Jan 2021, 18:34

                              @fcwilt true, probably why they where changed on the other machines

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                                jrockland
                                last edited by 14 Jan 2021, 18:53

                                Good news tho, the 3/4 inch aluminum bed survived (still straight). the only thing that died is the embedded magnets (n52).. Ill get those replaced then work on the gcode once the board is back.

                                1 Reply Last reply Reply Quote 0
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                                  jrockland
                                  last edited by 14 Jan 2021, 18:59

                                  reprap is getting better and better, and those 6hg/3hc boards are really solid. we blown multiple motors and heaters core (I remember something crashed IN the board hard enough that the thin metal door bended and shorted the board) and it still running strong.

                                  I tried to delete the post as it look like bang bang was deactivated, so not a firmware issue. anyway probably my bad when I wrote the gcode.

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