reverse a fan
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From: Sjouke Burry on 26 Mar 2010 15:23 GT wrote: > Does it damage a case fan to reverse its current and make it go backwards? > > AC: no problem, also no going bckward. DC: control is with electronics, it wont work and almost certainly blow the electronics, so not going backward and probably killed, unless it has a protection diode inside.
From: UCLAN on 26 Mar 2010 15:39 GT wrote: > Does it damage a case fan to reverse its current and make it go backwards? It won't damage it. It simply won't spin at all. DC fans spin in only one direction. The blade shape is designed to work moving in only one direction - the blade pushes air away from the blade's "spoon" shaped side. If you want to change airflow direction, you'll have to physically reverse the way the fan is mounted.
From: philo on 27 Mar 2010 20:53 UCLAN wrote: > GT wrote: > >> Does it damage a case fan to reverse its current and make it go >> backwards? > > It won't damage it. It simply won't spin at all. DC fans spin in only one > direction. The blade shape is designed to work moving in only one > direction - > the blade pushes air away from the blade's "spoon" shaped side. If you want > to change airflow direction, you'll have to physically reverse the way the > fan is mounted. correct The DC fans will NOT spin if the voltage is reversed
From: UCLAN on 31 Mar 2010 00:25
Joel wrote: > And it could make a big celebration if connecting a capacitor in reserved. > Heheheh back in 60's when I was studying electronics, we use to play trick > on each other by during lunch break, we sneaked back to the lab to reverse > the capacitor. We used to play tricks on the janitor by charging up a small 1000v cap and leaving it on the floor at the end of the day. It didn't take long for the janitor to learn that he should just leave them. Leaving a piece of cookie between the leads made a nice mouse trap, however. |