Problems wiring & configuring fans

[Ce72]

@dc42 Hi, I've got the 24v variant, so I could provide power straight from the PSU.

Regarding the wiring, I tried connecting:

6HC (out5) converter
pin1 (GND) GND on the 12-30V side
pin2 (VIN) 12-30V
pin3 (out5.tach) PWM +
pin4 (out5) PWM -

I had a multimeter across AO and ground on the output, (rather than connecting anything else) and had an output of 0 - 0.48V that varied with the "s" parameter.

VIN was 23.9V on the same multimeter

I hope this helps to find where I have gone wrong

[dc42]

@ce72 PWM+ needs to be connected to +5V (if you have the jumper on the convertor set to 5V) or VIN (if you have the jumper on the converter removed so that it can accept 24V). Do not connect anything to the out5.tach pin unless the fan has a tacho output.

As an alternative to using the PWM-to-voltage converter, the following may work (the driver description on that site gives very limited details, so it's hard to be sure):

• Connect the fan driver power wires as now (negative to GND and positive to VIN, either directly or on the fan connector, with the fan voltage jumper set appropriately)
• Connect a 1K resistor between out5_neg and +5V (you can find +5V on the IO_ connectors)
• Connect a 10K resistor between out5_neg and fan 0-5V in
• Also connect a capacitor of 100nf (0.1uf) or greater between fan 0-5V and ground
• In the M950 command for that fan, set the frequency (Q parameter) to the maximum, which is 65535

[Ce72]

@dc42 Sorry to be a pain but to clarify. and so that I fully understand, Am I right with these two options in sketch form:

OR

[Ce72]

@ce72
I wired up the PWM to voltage converter as above, and found I needed the jumper to get an output. So I put the jumper in the 24v side and I was able to tune the voltage down to around 6.5v output, from this i added a "F" value on the M106 line of my config file to limit the output to the required 5v with full control.

I'm pleased to say all is now working great I will also order the required risistors and cap to try the other way, to make a cleaner install and not need the work around in the config.