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Pulsing fan....

F

fatbob_158

2[H]4U
Joined
Jun 19, 2001
Messages
2,532
I have a Sunon fan, and it is pulsing, it's totally weird, is the fan just going bad? or is it not getting enough power? or?



-FB
 
Is it connected to a fan-bus or anything? It could be that it is under-powered but my guess is that unless you are running it on a fan bus with voltage controls (which is slowly burning itself out) that the fan itself is to blame.

Even if it is on a fan-bus, I would still guess that it is the fan because creating a "pulsing" effect would require a very specific voltage level... aka it probably wouldn't occur randomly.
 
I've never heard of a pulsing fan. Check the connection first. If the connection is good, replace it
 
It happens when you send 12 vac through it (took me forever to figure that one out :confused: )
 
I heard somewhere that Sunons do not like less than 7 volts. If you were to use the new Vantec fan controller that can go from 0-12 volts, it could happen. I have one and when I turn the fan down low (less than 7 volts I would say), the fan wouls speed up and slow down repeatedly for a while then stop and do it again. It bugged the crap out of me, so I hooked up my older Vantec fan controller and there is no problem.
 
I had a "Wall wort" adaptor, that gave "12 volt" and I was going to make a little cooler out of a 80mm fan. And when I hooked it up it pulsed, and I looked on the adaptor and it said on output "12VAC"

Thats how I did it, i'm not sure why the adapotor was 12vac, because it was used to power a lightbulb (anyone ever hear of littlites?)
 
I had a RaidMax allegedly 350 Watt PSU (the label said 178W MAX, go figure) that died and one of the symptoms was that it was making all my fans pulse. It was especially noticeable with my UV LED fans because they'd get brighter and dimmer. The pulsing fans was not the most obvious sign something was wrong though - my system refused to even post and I was getting the dreaded "FF on power-on" 8RDA+ problem.
 
Is this while it is in the case? May it be the fan´s frequency going in and out of sync with other items. Like with 2 hdds
 
Originally posted by Pherret
Is this while it is in the case? May it be the fan´s frequency going in and out of sync with other items. Like with 2 hdds
Click to expand...
yeah, i think this was the issue, i'm getting a new case in a week or so, so then i'll have the opportunity to re-wire everything with 90deg molex connectors
 
Originally posted by TekieB
I had a "Wall wort" adaptor, that gave "12 volt" and I was going to make a little cooler out of a 80mm fan. And when I hooked it up it pulsed, and I looked on the adaptor and it said on output "12VAC"

Thats how I did it, i'm not sure why the adapotor was 12vac, because it was used to power a lightbulb (anyone ever hear of littlites?)
Click to expand...

well there's your problem. If it's a DC fan, it's not designed to run on an AC power supply.
 
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