370forlife
06-19-2009, 10:50 PM
I have a little 350w Rosewill psu I use to power fans if maybe its getting hot in my room or I need to spot cool something, when it gets hot I stick two nidec 240cfm sunfire 880 server fans in the window running on this psu.
Well, the deer made rosewill ate itself the other day, so I decided to just use this little useless astec 200w psu from a hp vectra vli8. I hook up the fans, they reach about 500rpm each and the psu shuts itself off. Strange.
Then I figure "duh, theres no 5v and 3.3v load, so its crossloading, and this is group regulated"
So I hook a old maxtor 5400rpm hard drive to a molex connector, and walla they spin right up and do their job for hours on end now. So was the cutting out caused by some sort of crossload protection or probably just 5v sense? Would a crossload situation like a higher 12v draw cause the 5v to go too high? These fans are only 1.85A each, but who knows how much they use when spinning up. Or is it possible it has 12v sense, too? Its got a little chip on a riser board that the fan is connected to, its right next to where the output wires connect to the pcb. Its a astec AS2333C, only info I can find on it is that its a "house keeping circuit"
I'll have to disconnect the maxtor and plug in my DMM to see what the 12v voltage is before it cuts out, right now its too late and rainy out.
Well, the deer made rosewill ate itself the other day, so I decided to just use this little useless astec 200w psu from a hp vectra vli8. I hook up the fans, they reach about 500rpm each and the psu shuts itself off. Strange.
Then I figure "duh, theres no 5v and 3.3v load, so its crossloading, and this is group regulated"
So I hook a old maxtor 5400rpm hard drive to a molex connector, and walla they spin right up and do their job for hours on end now. So was the cutting out caused by some sort of crossload protection or probably just 5v sense? Would a crossload situation like a higher 12v draw cause the 5v to go too high? These fans are only 1.85A each, but who knows how much they use when spinning up. Or is it possible it has 12v sense, too? Its got a little chip on a riser board that the fan is connected to, its right next to where the output wires connect to the pcb. Its a astec AS2333C, only info I can find on it is that its a "house keeping circuit"
I'll have to disconnect the maxtor and plug in my DMM to see what the 12v voltage is before it cuts out, right now its too late and rainy out.