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]

1. 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"

2. 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:

1. 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"

2. 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.