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    silicone heat bed tuning

    Tuning and tweaking
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    • tdybare69
      tdybare69 last edited by

      i have hooked my duet2 wifi to my 12v powers supply,and 750w silcone bed via a ssr. how do i fine tune the heat bed in the config files?

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

        You should run a PID tuning cycle on it.

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

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        • tdybare69
          tdybare69 last edited by

          this is what i recievedfor the M303 H0.
          M307 H0
          Heater 0 model: gain 317.3, time constant 665.7, dead time 9.8, max PWM 1.00, calibration voltage 12.1, mode PID, inverted no, frequency default
          Computed PID parameters for setpoint change: P38.0, I0.470, D262.1
          Computed PID parameters for load change: P38
          M303 H1
          PMM307 H1
          Heater 1 model: gain 898.2, time constant 180.8, dead time 2.9, max PWM 1.00, calibration voltage 11.9, mode PID, inverted no, frequency default
          Computed PID parameters for setpoint change: P12.4, I0.541, D25.2
          Computed PID parameters for load change: P12.

          dc42 1 Reply Last reply Reply Quote 0
          • zapta
            zapta @tdybare69 last edited by

            750W at 12v is about 60A. That's very high current and not a very common combination. what kind of wires are you using there?

            tdybare69 1 Reply Last reply Reply Quote 0
            • jens55
              jens55 last edited by

              He is using the 12V signal to control an SSR that switches a line voltage heat bed on and off. He is not using 12V for the actual heat bed.

              zapta 1 Reply Last reply Reply Quote 0
              • zapta
                zapta @jens55 last edited by

                @jens55, I see, this is a AC mains heater. Makes more sense.

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                • dc42
                  dc42 administrators @tdybare69 last edited by

                  @tdybare69 said in silicone heat bed tuning:

                  this is what i recievedfor the M303 H0.
                  M307 H0
                  Heater 0 model: gain 317.3, time constant 665.7, dead time 9.8, max PWM 1.00, calibration voltage 12.1, mode PID, inverted no, frequency default
                  Computed PID parameters for setpoint change: P38.0, I0.470, D262.1
                  Computed PID parameters for load change: P38

                  That sounds reasonable (the PID parameters for load change have been truncated). You will get a warning about the temperature that might be reached at continuous full power, because of the high power of your bed heater; so you should include a thermal cutout in the bed heater circuit.

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                  • tdybare69
                    tdybare69 @zapta last edited by

                    @zapta 14GA

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