Delta PFC1212DE inverted PWM

[lgustavomp]

Hi everyone

i got a problem with my 2 deltas: the PWM signal is inverted (it slows down when things gets hot and vice versa). Doing a seach here in the fórum I seen something about "Inverted Schmitt Trigger" but I don't know much about circuits and i got lost searching for the schematics on google. Could someone give some help?

Thank you.

*solved* see my next reply

 

[NiHaoMike]

That sounds like the Deltas intended for use in Daikin mini split HVAC systems. Check to make sure the fan would actually work properly with the standard 25kHz or so PWM since the one I have only seems to operate properly if given 1kHz or so.

If inverting the signal is all you need, something like a 74HC04 will do the trick. If you also need to change the frequency, an Arduino would probably be the easiest.

 

[lgustavomp]

Thanks NiHaoMike

I made this circuit linked below and it worked flawlessly

http://www.overclockers.com/forums/...ires-PWM-fan?p=6914490&viewfull=1#post6914490