EMU Black PWM Fan Control - H-Bridge High Side Trigger

EMU BLACK / CLASSIC
1

Hello Everyone!

I’ve been tinkering with V3.054 on the EMU Black and was wondering how I could achieve the following:

I have a 16 inch Proform brushless fan that uses Positive (High Side) PWM control. 3 wires come from the fan, one wire is +ve PWM. Other 2 are heavy gauge power and ground sources.

How do I configure my H-Bridge to control that fan directly?

  • I see no option to ensure that I am sending a 12V PWM signal to that control wire on the fan.
  • So far, I am using the PWM Table 1, with CLT on the x-axis and VSS on the y-axis.
  • Is there an option I’m missing where I can set the polarity of H-Bridge?

Thanks!

2

Inverting the H bridge output will change it from low side to high side. However if memory serves PWM outputs only work low side.

A pull up to 12V and inverting the table may work for this.

3

Thanks for the suggestion! You’re right. I’ve been researching the topic and the consensus seems to be exactly that. I’ll probably start with a 10k ohm pull up. Also could be used on any AUX or H-Bridge output.

Cheers!