How can I use my E1 heater as a pwn controlled fan port

maroonds

that turns off when the extruder gets below 30 degrees? I'm on the latest RRF3.
I'm trying this on my duet maestro.
Any help is greatly appreciated.

dc42

Use M950 to create a fan using the E1 heater output:. Assuming you already have fans 0, 1 and 2 then the next available is 3:
M950 F3 C"e1heat"
Use M106 in the normal way to make fan 3 thermostatic. If the hot end thermistor is configured as sensor 1:
M106 P3 H1 T30 S1

maroonds

@dc42 Thank you! But whats the polarity on those connectors?

droftarts

@maroonds See https://duet3d.dozuki.com/Wiki/Duet_2_Maestro_Wiring_Diagram

Ian

tekstyle

@dc42 said in How can I use my E1 heater as a pwn controlled fan port:

Use M950 to create a fan using the E1 heater output:. Assuming you already have fans 90, 1 and 2 then the next available is 3:
M950 F3 C"e1heat"

Use M106 in the normal way to make fan 3 thermostatic. If the hot end thermistor is configured as sensor 1:
M106 P3 H1 T30 S1

In your example, what if I needed pwn1 as a fan port. Assuming I have fans 0,12,3,4,5,6,7,8. Do I do m950 F9 c"pwn1"
?

dc42

If you mean duex.pwm1 then that port is shared with heater 3. You can use one or the other.

tekstyle

@dc42 said in How can I use my E1 heater as a pwn controlled fan port:

If you mean duex.pwm1 then that port is shared with heater 3. You can use one or the other.

I just realized it after reading through some more literature that it's either or. Thank you for confirming.