Hello everyone,
I'm in the process of upgrading my Ender 3 Pro fans to 12V. I'm using Duet 2 Maestro with firmware 3.1.1 (2020-05-19b2).
I have a buck converter with inputs wired to VIN+ and VIN-. The converter is set up to output 12V and this is verified with multimeter.
I have wired the buck converter OUTPUT+ to both V_FAN_A (jumper middle pin) and V_FAN_B (jumper middle pin). (Same problem existed when I had it only wired to V_FAN_A)
When I power up the machine and start checking the fan ports with multimeter I get the following results:
Always-on-fan 12V (correctly).
FAN0, FAN1 and FAN2 0V (correctly).
After this I heat the hot end to 55 C (fan temperature threshold at 45 C), set the part cooling fan to 100% from DWC and check the ports with multimeter again:
Always-on-fan 12V (correctly)
FAN0 12V (correctly)
FAN1 7V
FAN2 7V
So something is wrong with FAN1 and FAN2 voltage and I can't figure out what it is. Can anyone help?