Firmware 3.0 update. Heaters problem

secure

@droftarts Thanks. I thought they were correct when I see them at 18C degree. I'm using typical 100K Ohm NTC3950.

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 08 2019 02:22:13 GMT+0300 (GMT+03:00)

; General preferences
G90                                                  ; Send absolute coordinates...
M83                                                  ; ...but relative extruder moves

; Network
M550 P"DUET"                                         ; Set machine name
M552 S1                                              ; Enable network
M587                        ; Configure access point. You can delete this line once connected
M586 P0 S1                                           ; Enable HTTP
M586 P1 S0                                           ; Disable FTP
M586 P2 S0                                           ; Disable Telnet

; Drives
M569 P0 S1                                           ; Drive 0 goes forwards X
M569 P1 S1                                           ; Drive 1 goes forwards Y
M569 P2 S1                                           ; Drive 2 goes forwards Z
M569 P3 S0                                           ; Drive 3 goes forwards E0
M569 P4 S0                                           ; Drive 4 goes forwards E1
M350 X16 Y16 Z16 E16:16 I1                           ; Configure microstepping with interpolation
M92 X80 Y80 Z400 E95.00:95.00        	             ; Set steps per mm (CUBE:Y20.15 X:20.05 M92 X80.25 Y81.00 Z400.25 E95.00:95.00) 
M566 X1000.00 Y1000.00 Z100.00 E120.00:120.00        ; Set maximum instantaneous speed changes (mm/min) (best at M566 X900.00 Y900.00 Z12.00 E120.00:120.00 )
M203 X20000.00 Y20000.00 Z500.00 E1200.00:1200.00    ; Set maximum speeds (mm/min) (best at M203 X6000.00 Y6000.00 Z180.00 E1200.00:1200.00 )
M201 X500.00 Y500.00 Z40.00 E300.00:300.00           ; Set accelerations (mm/s^2) (best at M201 X500.00 Y500.00 Z20.00 E250.00:250.00 )
M906 X1200.00 Y1200.00 Z1200.00 E1200.00:1200.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                              ; Set idle timeout

; Axis Limits
M208 X0 Y-10 Z0 S1                                   ; Set axis minima
M208 X420 Y420 Z400 S0                               ; Set axis maxima

; Endstops
M574 X1 Y1 S1                                        ; Set active high endstops

; Z-Probe
M574 Z1 S2                                           ; Set endstops controlled by probe
M307 H7 A-1 C-1 D-1                                  ; Disable heater on PWM channel for BLTouch
M558 P5 H15 F120 T6000 X0 Y0 Z1.5                    ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X-25 Y-25.3 Z1.4                             ; Set Z probe trigger value, offset and trigger height
M557 X50:440 Y20:430 S115                            ; Define mesh grid
G31 Z2.8

; Heaters
M305 P0 T100000 B4138 R4700                          ; Set thermistor + ADC parameters for heater 0
M143 H0 S120                                         ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700                          ; Set thermistor + ADC parameters for heater 1
M143 H1 S280                                         ; Set temperature limit for heater 1 to 280C
M305 P2 T100000 B4138 R4700                          ; Set thermistor + ADC parameters for heater 2
M143 H2 S280                                         ; Set temperature limit for heater 2 to 280C
M307 H0 P131.6, I5.350, D284.4			     ; Auto tuning sonuçları

; Fans
M106 P0 S0.3 I0 F500 H-1                             ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S0 I0 F500 H-1                               ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S0 I0 F500 H-1                               ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Tools
M563 P0 S"E1" D0 H1 F1				     ; Define tool E1 
M563 P1 S"E2" D1 H2 F2                               ; Define tool E2
G10 P0 X0 Y0 Z0                                    ; Set tool E1 axis offsets
G10 P1 X-32.50 Y0 Z0                                 ; Set tool E2 axis offsets
G10 P0 R0 S0                                         ; Set initial tool 0 active and standby temperatures to 0C
G10 P1 R0 S0 					     ; Set initial tool 0 active and standby temperatures to 0C

; Automatic saving after power loss is not enabled

; Custom settings are not configured

secure

M308 S1 P"e0temp" Y"thermistor" T100000 B3950

I have added this into my config file the readings getting worst. Infrared thermometer shows 110 deg while the heater set at 200C. It is interesting not find a calibration easily for that thermistor.

droftarts

@secure If it can melt filament, I'd trust the thermistor, not the IR probe, which measures the surface temperature. If it can't melt filament, you may have a faulty thermistor.

Ian

secure

I searched and come with a very little information about this "ebay" thermistors on Reprap firmware so I made a little guess with IR thermometer.

I configured settings like below.
M308 S1 P"e0temp" Y"thermistor" T100000 B4250 R4700

pid tuning
M307 H0 A81.1 C180.3 D3.1 S1.00 V25.3 B0
M307 H1 A479.4 C157.1 D3.0 S1.00 V25.2 B0
M307 H2 A498.2 C140.7 D2.9 S1.00 V25.2 B0

I went from bang bang to pid for heated bed. It is a 220v silicone heater. In bang bang mode I can see the SSR lights blinks. Now in pid mode it is dimming the ssr light. I will further investigate this as I dont know which is safe.

Thanks

droftarts

@secure said in Firmware 3.0 update. Heaters problem:

Now in pid mode it is dimming the ssr light. I will further investigate this as I dont know which is safe.

This will depend on the rating of your SSR. You can change the PWM frequency by using the Q parameter in the M950 command that creates the heater, eg .
M950 H0 C"bedheat" T0 Q100
See https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M950_Create_heater_fan_or_GPIO_servo_pin

Either that, or set it back to bang-bang mode, but keep the rest of the PWM settings, so it knows how long it's going to take to heat up, and doesn't fault, eg
M307 H0 A81.1 C180.3 D3.1 S1.00 V25.3 B1

Ian

dc42

For AC bed heaters controlled by SSRs, I recommend you use PID with the PWM frequency set to 10Hz (Q10 in the M950 H0 command).

secure

@dc42 Thanks captain that seems better now!

I'm using 100K NTC3950 sensor but I was thinking I'm on the the colder side. I've checked/ recalibrated sensor settings with my PID controller. When DUET shows 200C degree I was measuring 165C so I come up with settings

M308 S1 P"e0temp" Y"thermistor" T100000 B4360 c0.00000000001

I have tried with temperature points 100C-170C-260C and DUET reads fine now.

secure

The thing very interesting is the extruder steps.
I had to change that lot. How could this be?

2019 backup config.g file 2.04

M92 X80 Y80 Z400 E95.00:95.00

2020 config.g file 3.00

M92 X81.25 Y81.25 Z400.00 E250.00:250.00           ; set steps per mm

dc42

What type of extruder are you using, and what microstepping in your M350 command?

secure

Sorry this was my fault. My config.json file has 250mm steps so i edited via config tool(I like this) and missed that steps are wrong.

I need to figure out how to update config.json file.

Phaedrux

@secure To edit config.json you'd have to load it up in the configurator, make changes, and save it out again.

Or just stick to editing config.g since it's human readable.