Bed Heater Settings

Pierre52

@ 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.

Pierre52

@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.

Phaedrux

Can you post a photo showing the wiring at the board?

Veti

@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

Pierre52

@Phaedrux As requested, Red wires E0 - Bed Thermistor
Blue Wires - E3D Hot End Thermistor
Duet Wifi.jpg

And DWC Screen shot with those connections and unchanged ConfigG
Screen Shot.jpg

Phaedrux

@Pierre52 said in Bed Heater Settings:

Red wires E0 - Bed Thermistor
Blue Wires - E3D Hot End Thermistor

If 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 280C

Should 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 280C

Why aren't you using the bedtemp inputs for the bed?

Pierre52

@Phaedrux Ah that has made a difference;
Screen Shot.jpg

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/

Phaedrux

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.

Pierre52

@Phaedrux Aha the light finally comes on. Thanks for all your help on this.

Phaedrux

No problem. Glad you got it sorted out.