I ran into problems. But I am a minority. I personally suggest to leave it stock, but many have gotten away with it no problems.Without reading every page of this thread I run my ep2500's pretty hard. Has anyone ever had any problems with them getting too hot etc with this mod? With 3 of them running in my 1 room its pretty loud just don't want to have to worry about them getting to hot or over heating as I am pushing them hard when I am using them.
I think I like this approach better than a fan swap. This seems like it would get the best air flow while customizing the maximum amount of noise that can be tolerated. If someone could tolerate more noise, they could simply use a different value of resistor. I am not an electronics expert but I don't see how this simple electrical change could damage the unit. If anyone has any other input, please speak up. Of course, it could still get too hot I guess but I think that is very unlikely unless you are pushing something *EXTREMELY* hard.I have fitted a 120 ohm 1w resistor inline on the positive line of the original fan, first I fitted a potentiometer and upped resistance until the sound of the fan was reduced enough and made sure there was plenty of air movement still then checked the resistance of the pot and replaced with the resistor. So far it seems to work well I can't hear the fan at -35db from 1.5m away and there actually seems to be more airflow at the front of the filter?? possibly just less turbulant flow and more laminar
Yes, you certainly can use a series resistor to lower the voltage across your fan to slow it down, but it's considered a bad idea with a DC fan. They really prefer their designed terminal voltage to be present, so depending on the load, they will be able to draw the appropriate current, specifically on start up where the load is the greatest.I am not an electronics expert but I don't see how this simple electrical change could damage the unit. If anyone has any other input, please speak up.
So got it in yet? How's the performance of this fan? Not cheap. Worth the dolleros$$?For the aussies, RS components stock the papst fan stock # 299-1403. Awaiting my EP2500 will let you know after i mod mine with this fan.(papst part #8414NGL 1500rpm 12db 24vdc).