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    PID, PWM and SSR

    Duet Hardware and wiring
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    • zzing
      zzing last edited by

      I was wondering how to select an SSR that can work with the DuetWifi and PID and PWM for bed temperature control.

      My new printer design is going to be using a silicon heater (probably a custom one from Keenovo), that I am hoping to get around 1W/cm2. That would place it around 14.3A at 24V. I might later end up going larger, and I would like to have a certain safety factor on the amperage anyhow.

      I currently have one of these: http://imgur.com/a/gICKy

      But I am not convinced it is very good on any account, the similarity in this breakdown: https://www.youtube.com/watch?v=DxEhxjvifyY is a little worrisome.

      So I was considering one of these: http://www.digikey.ca/product-detail/en/crydom-co/CKM0620/CC1721-ND/1643035

      Which has the added benefit that it is din rail mounted. In the Datasheet it says maximum on / off time is 1.0ms. But it doesn't list any frequencies otherwise.

      EDIT: I just wanted to add that I found another one: http://www.digikey.ca/product-detail/en/crydom-co/DR2220D30U/CC2258-ND/5699192 that rates 1kHz on PWM.

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      • Sniffle
        Sniffle last edited by

        To my understanding Mosfets handle PWM better than SSR's. That being said you can get a mosfet driver board much cheaper than an SSR.

        https://www.amazon.com/BIQU-Power-Module-Expansion-Printer/dp/B01HEQVQAK/ref=sr_1_1?s=industrial&ie=UTF8&qid=1484789627&sr=1-1&keywords=3D+Printer+Heated+Bed+Power+Module

        handles up to 25A supposedly, 12-24V input and uses your bed output to control it. I should add that I use this, it's dead silent and barely gets warm for PLA bed temps.

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        • dc42
          dc42 administrators last edited by

          I cover this at https://duet3d.com/wiki/Connecting_a_bed_heater#Bed_heater_driven_using_a_Solid_State_Relay. For DC bed heaters, us the Auber Instruments SSR.

          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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          • DjDemonD
            DjDemonD last edited by

            Why not consider mains voltage, strangely it does get rid of far more headaches than it creates, and the performance is superb. Eg. 5mm tooling plate 330mm circular bed goes from ambient to 120 deg C in 3 mins 20 seconds.

            Simon. Precision Piezo Z-Probe Technology
            www.precisionpiezo.co.uk
            PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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            • BlackTom
              BlackTom last edited by

              Hi,
              I'm using the Auber Instruments MGR-1DD80D100 that DC42 recommend on the wiki and I've nothing to say about it.
              It does its job perfectly, beside an almost imperceptible vibration caused by switching that doesn't affect anything.
              I use it with the makerfarm 12v heatbed 12x12in

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              • InSanity
                InSanity last edited by

                I'm not sure if it's been mentioned yet or not that not all SSR's work with DC voltages, some are AC only. Pretty much if it doesn't have a DC current rating specified I would assume it's AC only.

                Jeff

                Duet WiFi Powered FFCP with E3D legends hotend system. BLTouch grid leveling.

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                • ronnien59
                  ronnien59 last edited by

                  I am currently using a DIN-Rail Mount Long-Life High-Amp Relay, SPST-NO, 4-32V DC, 20A @ 600V AC,
                  6323T42 from mcmaster carr
                  I have had my keenova 110 AC bed running for the last 4 months.

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