Duet 3 Slow Hotend Heatup, can't even run PID tuning



  • Hi,

    I'm using a 24V 50W cartridge with a Dyze high temp thermistor on a mosquito hotend.

    The R value is appropriate (2200) and the displayed temperature is accurate (measured with a meat thermometer lol)

    However the heatup cycle is painfully slow, and can't even complete the PID tuning cycle in time.

    f2ac13dc-8273-405f-a6ca-1486890ff356-image.png

    I tried with different P values; 0.35, 0.5, 1

    Here's the relevant part of my config.g:

    ; Thermistors
    M308 S0 P"temp0" Y"thermistor" A"bed_heat" T100000 B4240 H0 L0 		;Bed thermistor - connected to temp0
    M308 S1 P"temp1" Y"thermistor" A"e0_heat" T4606017 B5848 C5.548428e-8 R2200 H0 L0	;Dyze 500c thermistor - connected to e0_heat
    
    ; Define Heaters
    M950 H0 C"out0" T0				;Bed heater is on out0
    M950 H1 C"out1" T1				;Hotend heater is on out1
    
    ; Heater model parameters
    M307 H0 A90.0 C700.0 D10.0 S1.00 B1 		;Keenovo duet 3 configuration
    M307 H1 A580.4 C256.6 D6.4 S0.50		  ; Heating process parameters for 24V a system
    
    M570 S360					;Hot end may be a little slow to heat up so allow it 180 seconds
    M143 S300					;Set max hotend temperature			
    

    Any thoughts?

    Cheers!



  • @fractalengineer said in Duet 3 Slow Hotend Heatup, can't even run PID tuning:

    R value is appropriate (2200)

    Is it? Not sure, and mobile, but if you leave R out, the firmware will use the correct value for your board so that's a sure way of doing it.



  • In your config, heater H1 (witch is hotend i assume) is defined to use only 0.5 (S parameter in M307 command) PWM signal. Make it 1.0 (or remove S parameter at all) and try again.



  • @bearer , @aidar

    Well that's uncanny;

    I thought R2200, P1.0 were the Duet3 standard values so I left them on

    Removing them actually solved the issues; PID tuning is complete and it heats up to temp in seconds

    That board is smarter than it looks 😂

    Thanks!



  • @fractalengineer said in Duet 3 Slow Hotend Heatup, can't even run PID tuning:

    That board is smarter than it looks

    😀


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