Not sure what I've broken - NF-A4x20 5V PWM on FAN0
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OK, I've had this working fine previously with not problems, but after moving the duet wifi board into an new enclosure I cannot get the cooling fan to work.
The fan itself is a NF-A4x20 5V PWM.
I've connected the 5V to expansion pin 1.
GND to expansion pin 2.
PWM control to FAN0-.
I have not connected the speed sensor.i've set up the fan on config.g with:
M106 P0 S0 I1 F25000 H-1The fan will not spin at all, no matter what % speed I set it to.
I've checked continuity of all cables and they are all fine.
5V (ex P1) reads as 4.66V against GND (ex P2).If I connect a 12V blower style pwm fan (across VFAN0- and V_FAN (12V)) it runs as expected at M106 P0 S0 F500 I0 H-1
The killer seems to be that if I just connect the Noctua fan to an Arduino and control it from there it seems to work fine.
Any insight would be fantastic.
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Does the 5V fan run at full speed if you leave the PWM wire unconnected?
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No. This is the same behavior on the arduino.
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PWM fans normally run at full speed with the PWM control wire not connected. Perhaps yours has developed a fault. Adding a pullup resistor (try 1K) between the PWM wire and +5V may get it working again.
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This is working. Thank you. Only issue is that it will still run while the ATX power is off, but this will do until i have a replacement for it.
