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    120vac 750w Bed heater/SSR combo and PID mode

    Tuning and tweaking
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    • fcwilt
      fcwilt last edited by fcwilt

      Hi,

      Can a 120vac 750w bed heater/SSR combo be run in PID mode?

      Will the SSR suffer from the way the heat is controlled?

      Thanks.

      Frederick

      Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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      • sigxcpu
        sigxcpu last edited by

        I am running a 600W heater with SSR in PID mode. The PWM frequency is 10Hz. Te printer is fine, the lights in the house not so much. Disco-printing 🙂

        fcwilt 1 Reply Last reply Reply Quote 0
        • fcwilt
          fcwilt @sigxcpu last edited by

          @sigxcpu said in 120VAC Bed heater/SSR combo and PID mode:

          I am running a 600W heater with SSR in PID mode. The PWM frequency is 10Hz. Te printer is fine, the lights in the house not so much. Disco-printing 🙂

          Thanks much. Good to know.

          Frederick

          Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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          • mrehorstdmd
            mrehorstdmd last edited by

            I run a 750W bed heater under PID control with an SSR. IRIC, the frequency is set to 20 Hz. No issues at all. My SSR has a built in zero-crossing detector.

            https://drmrehorst.blogspot.com/

            fcwilt 1 Reply Last reply Reply Quote 0
            • fcwilt
              fcwilt @mrehorstdmd last edited by

              @mrehorstdmd said in 120vac 750w Bed heater/SSR combo and PID mode:

              I run a 750W bed heater under PID control with an SSR. IRIC, the frequency is set to 20 Hz. No issues at all. My SSR has a built in zero-crossing detector.

              I checked on the M307 command and it talks about PWM frequency but it doesn't mention (at least that I see) the units.

              The M307 for the bed heater reports the frequency is the default.

              So how did you decide on 20Hz and how do you set that?

              Thanks.

              Frederick

              Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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              • sigxcpu
                sigxcpu last edited by

                The default for bed heater is 10Hz. You can set it with M307 and "F" parameter.

                Source for 10Hz:

                https://github.com/dc42/RepRapFirmware/blob/fa55cdada75c00cac180e26a31e151ed18093abd/src/Configuration.h#L124

                Source for "F" parameter:
                https://duet3d.dozuki.com/Wiki/Gcode#Section_M307_Set_or_report_heating_process_parameters

                fcwilt 1 Reply Last reply Reply Quote 0
                • fcwilt
                  fcwilt @sigxcpu last edited by

                  @sigxcpu said in 120vac 750w Bed heater/SSR combo and PID mode:

                  The default for bed heater is 10Hz. You can set it with M307 and "F" parameter.

                  Source for 10Hz:

                  https://github.com/dc42/RepRapFirmware/blob/fa55cdada75c00cac180e26a31e151ed18093abd/src/Configuration.h#L124

                  Source for "F" parameter:
                  https://duet3d.dozuki.com/Wiki/Gcode#Section_M307_Set_or_report_heating_process_parameters

                  Thanks very much.

                  Frederick

                  Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

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                  • mrehorstdmd
                    mrehorstdmd last edited by

                    The line frequency is 60 Hz, so I thought some value that's not too low, and there isn't much point in switching it higher than the line frequency. The bed is massive and temperature changes are slow, so even 20 Hz is probably faster than it needs to keep the temperature well regulated. I added an F20 parameter to the M307 statement for the bed heater to set the frequency.

                    https://drmrehorst.blogspot.com/

                    fcwilt 1 Reply Last reply Reply Quote 0
                    • fcwilt
                      fcwilt @mrehorstdmd last edited by

                      @mrehorstdmd said in 120vac 750w Bed heater/SSR combo and PID mode:
                      The bed is massive and temperature changes are slow, so even 20 Hz is probably faster than it needs to keep the temperature well regulated. I added an F20 parameter to the M307 statement for the bed heater to set the frequency.

                      Thanks much.

                      I made my first print with a heated bed. No warping/curling using PLA and good adhesion - almost too good - it was a little hard to work loose.

                      Frederick

                      Printers: A FT-5 with the 713 upgrade bits. A custom MarkForged style. A small Utilmaker style and a CoreXY from kits. Various hotends. Using Duets (2 and 3) running 3.4.1

                      1 Reply Last reply Reply Quote 0
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