Hotend overshoots at beginning of print
-
Hello,
I ran into an issue after setting up a duet 3 mini 5 for the first time.
After the PID autotuning was done everything looked normal.
When starting a print it heats up and starts, but after the purge line and skirt are printed an error occurs;
"Error: Heater 0 fault: exceeded allowed temperature excursion: target 220.0°C actual 248.8°C
The temperature started rising significantly (up to 250°c, setpoint was 200°c) and the printer made an emergency stop.
How is this possible?
Tried it on many files, all same problem.Heres my config.g file for mij setup
*; Configuration file for Duet 3 Mini 5+ (firmware version 3.3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.3.10 on Thu Feb 17 2022 19:48:12 GMT+0100 (Central European Standard Time); General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P ; set printer name
M665 R197.22 L351.4 B180 H400 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X-1.66 Y-0.18 Z0.00 ; put your endstop adjustments here, or let auto calibration find them; Drives
M569 P0.0 S1 ; physical drive 0.0 goes forwards
M569 P0.1 S1 ; physical drive 0.1 goes forwards
M569 P0.2 S1 ; physical drive 0.2 goes forwards
M569 P0.3 S0 ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E0.3 ; set drive mapping
M350 E256 I0 ; configure microstepping without interpolation
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M92 X100.00 Y100.00 Z100.00 E7748.24 ; set steps per mm
M566 X1000.00 Y1000.00 Z1000.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 E10000.00 ; set maximum speeds (mm/min)
M201 X8000.00 Y8000.00 Z8000.00 E8000.00 ; set accelerations (mm/s^2)
M906 X900 Y900 Z900 E900 30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 Z0 S1 ; set minimum Z; Endstops
M574 X2 S1 P"io0.in" ; configure switch-type (e.g. microswitch) endstop for high end on X via pin io0.in
M574 Y2 S1 P"io1.in" ; configure switch-type (e.g. microswitch) endstop for high end on Y via pin io1.in
M574 Z2 S1 P"io2.in" ; configure switch-type (e.g. microswitch) endstop for high end on Z via pin io2.in; Z-Probe
M558 P0 H5 F120 T9000 ; disable Z probe but set dive height, probe speed and travel speed
M557 R85 S20 ; define mesh grid; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0 ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M307 H0 R0.324 K0.329:0.000 D4.99 E1.35 S1.00 B0
M140 H0 ; map heated bed to heater 0
M143 H0 S100 ; set temperature limit for heater 0 to 100C
M308 S1 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1 ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M307 H1 R2.959 K0.400:0.000 D7.43 E1.35 S1.00 B0 V23.9
M143 H1 S280 ; set temperature limit for heater 1 to 280C; Fans
M950 F0 C"out3" Q500 ; create fan 0 on pin out3 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out4" Q500 ; create fan 1 on pin out4 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
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
M501
* -
@bobzetels This is almost certainly a wiring issue. The jagged peaks and troughs in the thermistor readings show that the thermistor is failing, there's a loose connector, or it is picking up interference from something else. It's impossible for the real temperature to change that quickly.
Ian
-
@droftarts thanks for the respons.
I changed to a brand new E3D thermistor for the Vulcano hotend i have installed, without any luck.
In the end I restarted from a clean duet config using the RRF configurator and this solved the problem.
I have no idea what the exact problem was, probably some fault in de config.
