Bed and Hotend heating don't work



  • I am a bit new to duet and just setting up my custom 3D printer configuration. No matter what I have tried I can't seem to get my nozzle and bed heaters to work; let alone autotune. My thermistors are showing the room temperature readings but when I try to select a temperature on the web interface, nothing happens. Can someone please offer some assistance to stop me from bang my head again the wall? PSB by config.g setup for heaters.

    M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
    M305 P0 T100000 B3950 R4700 ; Configure bed thermistor + ADC parameters
    M143 H0 S170 ; Set temperature limit for heater 0 to 170C
    M305 P1 T4606017 B5848 C5.548428E-8 R4700 H0 L0 ; Set thermistor + ADC parameters for heater 1
    M143 H1 S493 ; Set temperature limit for heater 1 to 493C

    ; Fans
    M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off

    ; Tools
    M563 P1 S"Dyze" D0 H1 ; Define tool 1
    G10 P1 X0 Y0 Z5 ; Set tool 1 axis offsets
    G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C

    ; Automatic power saving
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss



  • In the webpage for your Duet, next to the temp setting, have you made the heater 'active'?

    HTH



  • Thank you for that suggestion. I had to select the tool for the hotend to make it active. However, it overshot the required test temperature (180C) and reported a fault.

    Although the bed has always been "active" I still can't get it to heat up at all.



  • I forgot to mention that I am using a Dyze 500C hotend. I have applied their recommended settings in config.g (see previous post). I am also using a 220V silicone heated bed, wired through an SSR relay. I am certain that I have this wired up correctly, as it is connected in the same way as my other printer which works just fine.



  • Have you checked that the Duet is outputing the a voltage to the SSR and the SSR is getting it? Also check that the SSR is getting 220v and outputing 220v to the bed.
    If there is 220v going into the SSR and non on the output after confirming that the SSR is receiving the signal from the Duet, it could be the SSR at fault.


  • administrators

    @dawgheart said in Bed and Hotend heating don't work:

    I forgot to mention that I am using a Dyze 500C hotend. I have applied their recommended settings in config.g (see previous post). I am also using a 220V silicone heated bed, wired through an SSR relay. I am certain that I have this wired up correctly, as it is connected in the same way as my other printer which works just fine.

    • Are you sure that the + and - control terminals to the SSR are wired the right way round?
    • Does the bed heat LED on the Duet turn on when you command the bed to heat up?
    • If the SSR has a LED to indicate that it is receiving the control signal, does that light up too?


  • So I went back to check all my connections and wiring of the Bed and SSR.
    (1) after sending a G-code to heat the bed I checked the bed LED (light on) and voltage (output = 25.5 VDC),
    (2) I then checked the SSR (25.5 VDC) on input side but 0 VAC on output side, LED indicator was also on. I was relieved because I knew the fault could not be the bed heater and must be the SSR.
    (3) To double check, I then connected a 220VAC fan directly to the my home AC outlet to check that it works (it did) then proceeded to connect it to the SSR in the same way that I connected the bed heater. It did not work!
    (4) I then rechecked my wiring between the bed heater and the SSR and found that I had wired this up incorrectly. I then wired the AC + output directly to the bed heater then wired the returning negative (black) wire from the heater to the #2 AC terminal on the SSR. I then wired the the #1 AC terminal on the SSR to the AC negative terminal on the power supply.
    (5) After re-sending another G-code to heat the bed, it worked!

    Many thanks for your help guys. Couldn't have done it without your help. I am now going to run auto-tune on both heaters.



  • Does anyone have an M307 H1 A### C### D### B0 parameter already configures for Dyze 500C hotend? I am really struggling to get mine to auto tune.


  • administrators

    @dawgheart said in Bed and Hotend heating don't work:

    Does anyone have an M307 H1 A### C### D### B0 parameter already configures for Dyze 500C hotend? I am really struggling to get mine to auto tune.

    What happens when you try to auto tune it?


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