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    pwm voltage

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    • JVundefined
      JV
      last edited by

      Hi guys
      I would add a device to heat my 3d printer chamber and the device seller ask me if i have 10 to 24 volts pwm output signal from my duet2 board to pilot this device.

      Could any body tell me please the voltage that i have in the pwm output?

      If i have 3.3v or 5v in the pwm output signal, is possible to pilot a SSR with my pwm signal and conect 24volt in the open contact of the SSR?
      Thanks

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      • aidarundefined
        aidar
        last edited by

        As far as i understand, pwm pulse amplitude is VIN on heater pins, also on fan pins, unless you selected with jumper to use 5 v, and 5v on servo pin(s). So in short, yes, you have 10 to 24 v pwm signal.

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        • Danalundefined
          Danal
          last edited by

          Voltage for every connector is noted in the key on the wiring diagram.

          Delta / Kossel printer fanatic

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          • JVundefined
            JV
            last edited by

            thanks guys for your reply

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            • JVundefined
              JV
              last edited by

              i found a device to heat the air pushed inside of my chamber by a fan , the problem that i actually have is that at the maximun power of the heater, the output air can reach more than 300°C and it can be obviously a big problem for the components that i have inside of my machine and for the safety.

              if i'm not wrong i can limitate the power of the heater making the maximun pwm output signal in a percentage like 20% when is at maximun output right?

              So if the output signal at 100% mean 300°c, Can I setting that output parameter when the heater at maximun power will be just the 20% (80°C) to avoid in any case a 300°c temperature in the air output?

              Thanks for your help

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              • dc42undefined
                dc42 administrators
                last edited by

                Yes and no. Yes, when everything is working correctly. No if there is a failure of the electronics or firmware or your configuration files and 100% PWM gets applied by mistake. So if 100% PWM would risk a fire or cause severe economic damage, then you shouldn't rely on restricting the PWM to limit the temperature rise unless you also use a thermal cutout.

                What type of heater is it? If it's a DC heater, you could reduce the voltage to reduce the heater power. If it's an AC heater, you may be able to halve the power by connecting a diode in series with it.

                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

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