How to change bed heater fault parameters?



  • I just finished a new printer and am working on configuring the firmware. I try to set my bed to 60C but it faults saying that it is not rising quickly enough. I have a 300^2mm and it does start to heat before faulting so I expect Duet is assuming a smaller bed. How can I change the fault value?

    Heater 0 fault: temperature rising much more slowly than the expected 1.7°C/sec
    

  • Moderator

    PID tune the heaters to give the firmware an idea of their performance characteristics.

    https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s161

    M303 H0 S60 to tune
    M500 to save it
    M501 at the end of config.g to load saved values at boot



  • @Phaedrux Thanks I'll do that



  • @Phaedrux So I did the auto tune but now my bed makes a really loud noise from the PWM. I enabled bang-bang with M307 H0 B1 but it gave a warning. It was still warm at the time I sent the command, idk if that has anything to do with it. I'm re-tuning it now.

    Warning: M307: Heater 0 appears to be over-powered. If left on at full power, its temperature is predicted to reach 244C
    

  • Moderator

    Tune the bed from room temp for best results.

    Best not to use bang-bang at all.

    That warning is letting you know how hot the model predicts the bed could reach if it failed in a powered on state with no control.

    Can you share an example of the really loud noise? Where is it coming from?

    Also please share your config.g and the results of M122 and M98 P"config.g" so we can get a better idea of what's going on.



  • You can also adjust the WM frequency using 'Q' in the M950 gcode.
    Some MOSFETs etc can be noisy at certain frequencies


  • Moderator

    I was hoping he had one of those beds that picks up radio stations...



  • @jay_s_uk I always thought MOSFETs are noisy only when magic smoke escapes from them 😉



  • i have an external mosfet on one of my printers (18A 12v heated bed) and it sometimes screams like its being murdered for no reason



  • @jay_s_uk Is there any inductor around mosfet? I would rather expect wires to actually make noises not the mosfet. That is weird.



  • @Phaedrux bang-bang did solve the problem of the noise. I could tell the noise was related to be bed because it was only makeing it when the bed was hovering at the set temp, which is when PWM would be used. The noise comes from the actual bed itself and not Duet which is pretty odd. Here is a short vid (turn up the sound) https://drive.google.com/file/d/1iEl3BVpyKjvRqt8IHO-OAdeKiDSx-9hg/view?usp=sharing
    This is the bed I have https://www.aliexpress.com/i/4000311964727.html?spm=2114.12057483.0.0.14b5133eaIrF4D

    Also here is the output of M122 and M98

    M122
    === Diagnostics ===
    RepRapFirmware for Duet 2 WiFi/Ethernet version 3.1.1 running on Duet WiFi 1.02 or later
    Board ID: 08DGM-9T6BU-FG3S8-6J9F2-3SN6L-9ULVG
    Used output buffers: 7 of 24 (7 max)
    === RTOS ===
    Static ram: 27980
    Dynamic ram: 93912 of which 108 recycled
    Exception stack ram used: 264
    Never used ram: 8808
    Tasks: NETWORK(blocked,636) HEAT(blocked,1224) MAIN(running,1848) IDLE(ready,80)
    Owned mutexes: WiFi(NETWORK)
    === Platform ===
    Last reset 00:02:27 ago, cause: power up
    Last software reset at 2020-09-24 07:40, reason: User, spinning module GCodes, available RAM 8504 bytes (slot 1)
    Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0xffffffff Task MAIN
    Error status: 0
    MCU temperature: min 13.6, current 22.2, max 22.4
    Supply voltage: min 23.9, current 24.1, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
    Driver 0: standstill, SG min/max not available
    Driver 1: standstill, SG min/max not available
    Driver 2: standstill, SG min/max not available
    Driver 3: standstill, SG min/max not available
    Driver 4: standstill, SG min/max not available
    Date/time: 2020-09-26 09:56:09
    Cache data hit count 244309824
    Slowest loop: 1.42ms; fastest: 0.13ms
    I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
    === Storage ===
    Free file entries: 10
    SD card 0 detected, interface speed: 20.0MBytes/sec
    SD card longest read time 9.8ms, write time 0.0ms, max retries 0
    === Move ===
    Hiccups: 0(0), FreeDm: 169, MinFreeDm: 169, MaxWait: 0ms
    Bed compensation in use: none, comp offset 0.000
    === MainDDARing ===
    Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0 CDDA state: -1
    === AuxDDARing ===
    Scheduled moves: 0, completed moves: 0, StepErrors: 0, LaErrors: 0, Underruns: 0, 0 CDDA state: -1
    === Heat ===
    Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
    Heater 1 is on, I-accum = 0.0
    === GCodes ===
    Segments left: 0
    Movement lock held by null
    HTTP is idle in state(s) 0
    Telnet is idle in state(s) 0
    File is idle in state(s) 0
    USB is idle in state(s) 0
    Aux is assembling a command in state(s) 0
    Trigger is idle in state(s) 0
    Queue is idle in state(s) 0
    Daemon is idle in state(s) 0
    Autopause is idle in state(s) 0
    Code queue is empty.
    === Network ===
    Slowest loop: 15.24ms; fastest: 0.00ms
    Responder states: HTTP(2) HTTP(2) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
    HTTP sessions: 1 of 8
    - WiFi -
    Network state is active
    WiFi module is connected to access point
    Failed messages: pending 0, notready 0, noresp 0
    WiFi firmware version 1.21RC2
    WiFi MAC address bc:dd:c2:08:78:0b
    WiFi Vcc 3.39, reset reason Unknown
    WiFi flash size 4194304, free heap 15240
    WiFi IP address 192.168.1.245
    WiFi signal strength -63dBm, reconnections 0, sleep mode modem
    Socket states: 4 4 0 0 0 0 0 0
    
    M98 P"config.g"
    HTTP is enabled on port 80
    FTP is disabled
    TELNET is disabled
    Warning: Heater 0 appears to be over-powered. If left on at full power, its temperature is predicted to reach 365C
    Error: Pin 'fan1' is not free
    Error: Fan number 2 not found
    Warning: Heater 0 appears to be over-powered. If left on at full power, its temperature is predicted to reach 201C
    


  • Looks like magnetic bed.
    Current going through the heater wires + magnets = essentially speaker 😄
    I remember reading some posts that prusa actually implemented some fancy method of switching that eliminates that.

    https://blog.prusaprinters.org/dev-diary-2-how-we-made-the-heatbed-silent_30946/



  • @BoA It sounds like they were hearing a click or chirp sound. Its hard to hear in my video but I hear a constant tone which most likely correlates directly to the switching frequency. I can hear it change frequency as it tries to keep the bed temp steady.



  • @Phantom329 It is the same sound (I had prusa with their board). And frequency is constant in PWM.


  • Moderator

    You can alter the PWM frequency for the bed in the M950 command that creates the heater.

    https://duet3d.dozuki.com/Wiki/Gcode#Section_M950_Create_heater_fan_or_GPIO_servo_pin

    Post your config.g. it looks like you have a fan misconfigured as well.



  • @Phaedrux I fixed the fan, just had an extra one defined. Here is config.g and config-override.g. What should I set the PWM to? Btw thanks for helping me, I've learned a ton from troubleshooting this.

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.4 on Thu Sep 24 2020 07:39:49 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"Phantom Cube"                               ; set printer name
    M669 K1                                            ; select CoreXY mode
    
    ; Network
    M552 S1                                            ; enable network
    M586 P0 S1                                         ; enable HTTP
    M586 P1 S0                                         ; disable FTP
    M586 P2 S0                                         ; disable Telnet
    
    ; Drives
    M569 P0 S1                                         ; physical drive 0 goes forwards
    M569 P1 S1                                         ; physical drive 1 goes forwards
    M569 P2 S0                                         ; physical drive 2 goes backwards
    M569 P3 S0                                         ; physical drive 3 goes backwards
    M584 X0 Y1 Z2 E3                                   ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
    M92 X200.00 Y200.00 Z400.00 E418.00                ; set steps per mm
    M566 X720.00 Y720.00 Z12.00 E120.00                ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z600.00 E1200.00          ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z250.00 E1000.00              ; set accelerations (mm/s^2)
    M906 X1600 Y1600 Z1600 E1600 I30                   ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                            ; Set idle timeout
    
    ; Axis Limits
    M208 X0 Y0 Z0 S1                                   ; set axis minima
    M208 X350 Y310 Z310 S0                             ; set axis maxima
    
    ; Endstops
    M574 X1 S1 P"xstop"                                ; configure active-high endstop for low end on X via pin xstop
    M574 Y2 S1 P"ystop"                                ; configure active-high endstop for high end on Y via pin ystop
    M574 Z1 S2                                         ; configure Z-probe endstop for low end on Z
    
    ; Z-Probe
    M558 P1 C"zprobe.in" H20 F240 T6000                ; set Z probe type to unmodulated and the dive height + speeds
    G31 P25 X0 Y-15 Z13.5                              ; set Z probe trigger value, offset and trigger height
    M557 X40:300 Y20:280 S65                           ; define mesh grid
    
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138     ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0                              ; create bed heater output on bedheat and map it to sensor 0
    M307 H0 B0 S1.00                                   ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                            ; map heated bed to heater 0
    M143 H0 S100                                       ; set temperature limit for heater 0 to 100C
    M308 S1 P"e0temp" Y"thermistor" T100000 B4138      ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H1 T45                                  ; set fan 1 value. Thermostatic control is turned on
    
    ; Tools
    M563 P0 D0 H1 F0                                   ; define tool 0
    G10 P0 X0 Y0 Z0                                    ; set tool 0 axis offsets
    G10 P0 R0 S0                                       ; set initial tool 0 active and standby temperatures to 0C
    
    ; Custom settings are not defined
    
    ; Miscellaneous
    M575 P1 S1 B57600                                  ; enable support for PanelDue
    M501                                               ; load saved parameters from non-volatile memory
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
    T0                                                 ; select first tool
    
    ; config-override.g file generated in response to M500 at 2020-09-24 23:36
    ; This is a system-generated file - do not edit
    ; Heater model parameters
    M307 H0 A176.4 C339.5 D7.2 S1.00 V23.8 B1
    M307 H1 A297.7 C97.1 D6.5 S1.00 V24.0 B0
    ; Workplace coordinates
    G10 L2 P1 X0.00 Y0.00 Z0.00
    G10 L2 P2 X0.00 Y0.00 Z0.00
    G10 L2 P3 X0.00 Y0.00 Z0.00
    G10 L2 P4 X0.00 Y0.00 Z0.00
    G10 L2 P5 X0.00 Y0.00 Z0.00
    G10 L2 P6 X0.00 Y0.00 Z0.00
    G10 L2 P7 X0.00 Y0.00 Z0.00
    G10 L2 P8 X0.00 Y0.00 Z0.00
    G10 L2 P9 X0.00 Y0.00 Z0.00
    

  • Moderator

    @Phantom329 said in How to change bed heater fault parameters?:

    M950 H0 C"bedheat" T0

    Try adding Q10 to the end of that. Then you can experiment with different values to see how it changes. You can actually do that in real time by sending M950 H0 Q# in the gcode console while the bed heater is running. Once you find a frequency that works well you can change the config.g to make it take effect at startup.



  • @Phaedrux I tried changing the Hz from 1 to 1000 but no difference at all. I took a better video and also noted that the bed actually vibrates. It starts at around 55C and sometimes momentarily stops when above 60C (set at 60C) but immediately stops when I turn off the bed heat.
    https://drive.google.com/file/d/1k6DX-6bAaiALDYou7UZGFRZKjEFxABVc/view?usp=sharing


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