How to change bed heater fault parameters?
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@jay_s_uk I always thought MOSFETs are noisy only when magic smoke escapes from them
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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
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@jay_s_uk Is there any inductor around mosfet? I would rather expect wires to actually make noises not the mosfet. That is weird.
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@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=2114.12057483.0.0.14b5133eaIrF4DAlso 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 0M98 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/
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@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.
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@Phantom329 It is the same sound (I had prusa with their board). And frequency is constant in PWM.
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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.
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@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 -
@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.
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@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
