Dual heater circuit

e4d

Hello, I'm building a printer with a heated enclosure. I want it to be at 150°C in 30mn maximum. Currently I have 2x 750W heating resistors and it's not fast enough. I want to add one more but I can't keep them all connected during the print because of the power consumption.

My idea is to have them separeted in 2 circuits (one with 1x 750W and the others with the other two) with 2 SSR. So I use the 3 of them at the begining and when I'm at the temperature set I disconnect one of the circuit and keep only one resistor to make sure I stay at the correct temp.

I don't know how I can do that with the Duet config as I don't want to have to do it manually.
My current config is this one, I use a Duet3 6CH :

; H1 Chamber
M308 S1 P"0.temp1" Y"thermistor" A"Chamber" T100000 B4725 C7.06e-8  ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"0.out1" T1 Q10                                            ; create chamber heater output on out1 and map it to sensor 1
M307 H1 B0 R0.092 C2302.8 D104.47 S1.00 V24.3                       ; PID parameters
M141 H1                                                             ; map chamber to heater 1
M143 H1 S200                                                        ; set temperature limit for heater 1 to 200C

Could you please guide me in the right direction ?

Phaedrux

@e4d said in Dual heater circuit:

but I can't keep them all connected during the print because of the power consumption.

The power consumption during the print should be substantially less than during the initial heat up. Furthermore, the consumption required to maintain the temp won't increase by adding another heater, since each heater would actually have to work less to maintain the same temp since the load is spread out over the 3.

If you're already sure that consumption during the initial heat up isn't an issue, than I believe that consumption during the temperature maintenance phase won't be an issue either.

e4d

I did power measurement and you are right about this, the power consumption reduced when regulating the temperature so it's an acceptable value. Thanks !