Thanks so much- that cracked it, I don’t fully understand how the pid parameters work, so was well out of my depth.
Yes the sensor is above the heater outlet, it’s a modified cubepro from 3d systems, and that’s how they designed it in their wisdom (there’s of plenty of other strange desisions in the design too- lots of well machined hardware with no smart thinking in the design.
Again thanks for your help
Thanks- ok starting to see now.
so how do i define PID paremeters for a heated Chamber?
firstly its on bang, bang mode,
and if i try to PID tune it, it fails- see below
7:21:51 PMWarning: Auto tune of heater 7 failed due to bad curve fit (G=9.9, tc=8.8, td=0.6)
7:21:42 PMAuto tune phase 3, peak temperature was 45.1
7:21:35 PMAuto tune phase 2, heater off
7:21:17 PMAuto tune phase 1, heater on
7:21:11 PMM303 H7 P1 S45
Auto tuning heater 7 using target temperature 45.0°C and PWM 1.00 - do not leave printer unattended
thanks for the quick reply-
im still missing something- yes i have read the link you sent a couple of times- im just not sure how that applies to a chamber.
the way understand it the only lines that relate to the chamber are
M141 H7 ; Assign chamber heater to heater 7 CHAMBER
M301 H7 B1 S1.0 ; b0 =use pid control; b1= bang bang for the chamber heater, s1.0= max power 1.0
M143 H7 S80 ; Set temperature limit for heater 7 to 80C
my understanding is the m307 related to PID tuning, which does not seem relevant for a chamber heater?
cheers
Jason
I know im missing something simple here, but a lot of searching with no success.
i have a heater running on H7, and ut works, but i get the heater fault
'temperature is rising much faster than the 1.7c expected'
i dont know where its gettign that form, as its in bang bang mode.
anyone able to point me inthe right direction?
heres my config file,
; Configuration file for Duet WiF (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Thu Sep 20 2018 19:25:44 GMT+1200 (New Zealand Standard Time)
; General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
; Network
M550 PCubePro3D ; Set machine name
M552 S1 ; Enable network
M587 S" " P"" ; 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 AXIS
M569 P1 S1 ; Drive 1 goes forwards UNUSED
M569 P2 S0 ; Drive 2 goes BACK Z DRIVE REVERSED
M569 P3 S0 ; Drive 3 goes BACK E1
M569 P4 S0 ; Drive 4 goes BACK E2
M569 P5 S0 ; Drive 5 goes BACK E3
M569 P8 S0 ; Drive 8 goes BACK Y AXIS 1
M569 P9 S1 ; Drive 9 goes FWD Y AXIS 2
M584 X0 Y8:9 Z2 E3:4:5 ;Driver 0 controls the X motor, Y8 & 9 e motors 3& 4 &5
M350 X16 Y16 Z16 E16:16:16 I1 ; Configure microstepping with interpolation
M92 X87.5 Y87.5 Z1066.75 E87.5:87.5:87.5 ; Set steps per mm
M566 X500 Y500 Z12 E120:120:120 ; Set maximum instantaneous speed changes (mm/min)
M203 X12000 Y12000 Z600 E1200:1200:1200 ; Set maximum speeds (mm/min)
M201 X500 Y400 Z250 E250:250:250 ; Set accelerations (mm/s^2)
M906 X1500 Y1500 Z1500 E1500:1500:1500 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 X285 Y295 Z180 S0 ; Set axis maxima
; Endstops
M574 X1 Y2 S0 ; X home to min. Y home to max, Set Normally open limit switches
M574 Z1 S2 ;Define Z to use Probe. Home to Min
; Z-Probe
M307 H5 A-1 C-1 D-1 ; Disable the 5th Heater to free up PWM channel 3 on the Duex board.
M558 P9 H5 F100 T2000 ; Set Z probe type to bltouch and the dive height + speeds M558 P5 H5 F500 T4000 X0 Y0 Z1 ; Set Z probe type/mode 5. H=Dive Height. F=Speed the bed moves M558 P9 H5 F100 T2000 ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X90 Y60 Z2.50 ; Z probe trigger value, offset in relation to nozzle. And trigger height adjustment higher value bigger gap
M557 X100:200 Y15:195 S42.5 ; Define mesh grid - X start pos, end pos, Y start pos, end pos, grid spacing BL TOUCH
; Heaters
M141 H7 ; Assign chamber heater to heater 7 CHAMBER
;M307 H0 B0 S1.0 ; Enable bang-bang mode for the bed heater and set PWM limit DISABLED
; M305 P4 T159230 B3142 C-3.979714e-7 R4700 ; Set thermistor + ADC parameters for heater 0 BED DISABLED
;M143 H0 S120 ; Set temperature limit for heater 0 to 120C
M301 H1 S0.50 ; Set heater 1 PWM limit to 50%
M305 P1 T159230 B3142 C-3.979714e-7 R4700 ; Set thermistor + ADC parameters for heater 1 EXTRUDER 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M301 H2 S0.50 ; Set heater 2 PWM limit to 50%
M305 P2 T159230 B3142 C-3.979714e-7 R4700 ; Set thermistor + ADC parameters for heater 2 EXTRUDER 2
M143 H2 S280 ; Set temperature limit for heater 2 to 280C
;M301 H3 S0.50 ; Set heater 3 PWM limit to 50%
;M305 P3 T159230 B3142 C-3.979714e-7 R4700 ; Set thermistor + ADC parameters for heater 3 EXTRUDER 3
;M143 H3 S280 ; Set temperature limit for heater 3 to 280C
M305 P7 T100000 B4725 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 7 CHAMBER
M301 H7 B1 S1.0 ; b0 =use pid control; b1= bang bang for the chamber heater, s1.0= max power 1.0
M143 H7 S80 ; Set temperature limit for heater 7 to 80C
M140 H-1 ;disable bed in system added jp
; Fans
;M106 P0 S1 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
;M106 P1 S1 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
;M106 P2 S1 I0 F500 H1:2:3:7 T30 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P4 S1 I0 F500 H-1 ; Set fan 4 value, LAYER FAN PWM signal inversion and frequency. Thermostatic control is turned off
M106 P5 S1 I0 F500 H1:2:3 T30 ; Set fan 5 value, HOT END PWM signal inversion and frequency. Thermostatic control is turned on
M106 P6 S100 I0 F500 H1:2:3:7 T30 ; Set fan 6 value, CPU BOARD FAN PWM signal inversion and frequency. Thermostatic control is turned on
M106 P7 S100 I0 F500 H1:2:3:7 T30 ; Set fan 7 value, LIGHTS PWM signal inversion and frequency. Thermostatic control is turned on
; Tools
M563 P0 D0 H1 F4 ; Define tool 0 tool uses extruder drive 0 and heater 1. Fan 4 is mapped to fan 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
M563 P1 D1 H2 F4 ; Define tool 1
G10 P1 X40 Y0 Z0 ; Set tool 1 axis offsets
G10 P1 R0 S0 ; Set initial tool 1 active and standby temperatures to 0C
;M563 P2 D2 H3 F4 ; Define tool 2
;G10 P2 X80 Y0 Z0 ; Set tool 2 axis offsets
;G10 P2 R0 S0 ; Set initial tool 2 active and standby temperatures to 0C
; Automatic saving after power loss is not enabled
; Custom settings are not configured