Bed Heater Settings
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I am setting up a new Core XY build on a Duet Wifi Firmware is 3.02 and DWC is also latest version.
I am currently trying to configure the heated bed. The bed is a 220v silicon mat and the thermistor resistance measures at 138K.
Relevant Config G settings are:
; Heaters
M308 S0 P"bedtemp" Y"thermistor" T113800 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 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
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
M143 H1 S280 ; set temperature limit for heater 1 to 280CIf I Plug the Bed Thermistor into E 1 the Dashboard shows the Bed Temp as -273.1 degrees. If I set the Bed Heater to active, I get a "Sensor Open Circuit" fault.
If I plug the same Thermistor into E0 the Dashboard shows the current ambient temperature.
This would suggest that the Thermistor is fine and the problem is in Config G but I can't figure out where. -
Post your entire config.g.
Based on your config the bed thermistor should be connected to bedtemp and the hotend thermistor to E0temp.
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Hi Phaedrux
Here is the complete Config
; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
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
M552 S1 ; enable WiFi; Drives
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z3176 E420.00 ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X400 Y400 Z800 E800 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 X300 Y300 Z300 S0 ; set axis maxima; Endstops
M574 XY S3 ; configure sensorless endstop for X and Y
M915 XY R0 F0 ; Set up sensorless homing
M574 Z1 S2 ; configure Z-probe endstop for low end on Z; Z-Probe
M950 S0 C"exp.heater7" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20 ; define mesh grid; Heaters
M308 S0 P"bedtemp" Y"thermistor" T113800 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 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
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
M143 H1 S280 ; set temperature limit for heater 1 to 280C; 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; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue -
No further responses as yet. In the interim, I have been through the ConfigG file with a fine tooth comb. I have examined every line of G Code in the Heater settings and cannot find any obvious errors. I have also re-run the Rerap Config tool and compared old G with new G.
Bottom line, if I plug the Bed thermistor into E0 I get a reading on the DWC Current Bed temperature of -273.1 degrees. If I plug the same thermistor into E1 the the Tool0 current temperature reads ambient room temperature
Current Bed settings in ConfiG are:
; Heaters
M308 S0 P"bedtemp" Y"thermistor" T113800 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 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120CM308 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
M143 H1 S280 ; set temperature limit for heater 1 to 280C -
@Pierre52 said in Bed Heater Settings:
Bottom line, if I plug the Bed thermistor into E0 I get a reading on the DWC Current Bed temperature of -273.1 degrees.
Well yes. If you unplug the bedtemp port it would show -273 which means open circuit. If the thermistor becomes disconnected it shows that temp which would throw a heater fault.
@Pierre52 said in Bed Heater Settings:
If I plug the same thermistor into E1 the the Tool0 current temperature reads ambient room temperature
Are you sure you're not plugging it into E0?
Can you post the results of M122 and M98 P"config.g"?
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Hi Phaedrux
Here is the M122 result:
M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.2 running on Duet WiFi 1.02 or later
Board ID: 08DGM-9T6BU-FG3SD-6J1FD-3S46P-KVL3D
Used output buffers: 3 of 24 (16 max)
=== RTOS ===
Static ram: 23460
Dynamic ram: 72712 of which 188 recycled
Never used RAM 15720, free system stack 199 words
Tasks: NETWORK(ready,241) HEAT(blocked,307) MAIN(running,456) IDLE(ready,19)
Owned mutexes: WiFi(NETWORK)
=== Platform ===
Last reset 00:01:51 ago, cause: power up
Last software reset at 2021-01-30 13:38, reason: User, GCodes spinning, available RAM 15720, slot 0
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Aux0 errors 0,0,0
MCU temperature: min 28.1, current 33.8, max 34.1
Supply voltage: min 12.1, current 12.2, max 12.3, under voltage events: 0, over voltage events: 0, power good: yes
Driver 0: position 0, standstill, SG min/max not available
Driver 1: position 0, standstill, SG min/max not available
Driver 2: position 0, standstill, SG min/max not available
Driver 3: position 0, standstill, SG min/max not available
Driver 4: position 0, standstill, SG min/max not available
Driver 5: position 0
Driver 6: position 0
Driver 7: position 0
Driver 8: position 0
Driver 9: position 0
Driver 10: position 0
Driver 11: position 0
Date/time: 2021-01-30 19:54:50
Cache data hit count 135973359
Slowest loop: 8.42ms; fastest: 0.20ms
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 4.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 83, maxWait 0ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
=== 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 idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD 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: 16.85ms; fastest: 0.00ms
Responder states: HTTP(0) HTTP(0) 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 1.23
WiFi MAC address ec:fa:bc:2d:e4:7e
WiFi Vcc 3.42, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 24192
WiFi IP address 192.168.87.22
WiFi signal strength -44dBm, mode none, reconnections 0, sleep mode modem
Clock register ffffffff
- WiFi -
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@Phaedrux said in Bed Heater Settings:
M98 P"config.g"
M98 P"config.g"
HTTP is enabled on port 80
FTP is disabled
TELNET is disabled -
From Wiring Diag for the Duet 2 Wifi it is hard to tell which is Eo and Which is E1.
Here is a screen shot when the Thermistor is plugged into my guess of E1My guess is that EO is closest to the Erase and Rest Buttons
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E1 is closest to the edge of the board.
E0 is more to the center of the board beside E1.
Bed temp is on the edge of the board by the bed heater terminals.My guess is that EO is closest to the Erase and Rest Buttons
No that's E1
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@Pierre52 said in Bed Heater Settings:
M308 S0 P"bedtemp" Y"thermistor" T113800 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin e0tempThose settings seems off.
Most themistors on chinese silicone beds are B3950 T100000. Contact the seller for more information.your hotend is also not correct. you need to find out which thermistor it is.
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@ Phaedrux If that is the case, why do I get The Tool 0/Heater 1 reading the bed thermistor ambient (no hot end connected at this point) when I plug it into E0 (closer to center of board?
DWC Screen shot above shows that situation. -
@Veti I will follow your advice and check with the seller. However, When I measure the Bed Thermistor resistance I get a reading of 113800 ohms.
My Hot End Thermistor is an E3D V6. I will check those settings as well. At the moment those are the results that the Rep Rap Config gave.
Thanks for your input.
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Can you post a photo showing the wiring at the board?
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@Pierre52 said in Bed Heater Settings:
When I measure the Bed Thermistor resistance I get a reading of 113800 ohms.
and your room and the bed is exactly at 25C?
E3D V6
if its a genuine e3d its T100000 B4725 C7.06e-8
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@Phaedrux As requested, Red wires E0 - Bed Thermistor
Blue Wires - E3D Hot End Thermistor
And DWC Screen shot with those connections and unchanged ConfigG
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@Pierre52 said in Bed Heater Settings:
Red wires E0 - Bed Thermistor
Blue Wires - E3D Hot End ThermistorIf that's the case then your config is incorrect.
; Heaters M308 S0 P"bedtemp" Y"thermistor" T113800 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 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M143 H0 S120 ; set temperature limit for heater 0 to 120C 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 M143 H1 S280 ; set temperature limit for heater 1 to 280CShould be
; Heaters M308 S0 P"e0temp" Y"thermistor" T113800 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 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M143 H0 S120 ; set temperature limit for heater 0 to 120C M308 S1 P"e1temp" Y"thermistor" T100000 B4725 C7.06e-8 ; 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 M143 H1 S280 ; set temperature limit for heater 1 to 280CWhy aren't you using the bedtemp inputs for the bed?
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@Phaedrux Ah that has made a difference;
So the Bed Thermistor is reading correctly. I may have misled slightly on the Hot End Thermistor as it is actually one from a Beta test unit. I will be shortly fitting a Biqu H2 unit so will need to find the thermistor settings for that.
"Why aren't you using the bedtemp inputs ?" Very good question. Answer: Because I don't know what Gcode to use in Config G. If you could assist with that I would appreciate it.
I have also now unearthed the next minor issue in that the Bed heater is not responding. Possibly the clone DMWD SSR 40 DA I am using. I will work this through with my electronic guru mate who knows nothing about 3D printing but lots about electronics/
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The gcode you had before would work if you plugged the bed thermistor into the bed temp port of the board. Its right beside the power terminals for the bed.
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@Phaedrux Aha the light finally comes on. Thanks for all your help on this.
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No problem. Glad you got it sorted out.
