Fortron FSP 350-60PN

xbassman

Golden Member
Feb 25, 2001
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Anybody have a clue about the fan controller on this unit?

The fan on my wife's PS died a few days ago. The stocker was a Yate Loon D12SH-12 (high speed)
I replaced it with one of the cheap Yate Loon D12SL-12 fans from isellsurplus.com.

Anyway I fired it up and WOW that fan is dead silent! I mounted it decoupled although I probably didn't need to. It appears to be running at a low rpm, but I can't see any difference when I adjust the fan speed control on the back of the power supply.

Can anyone think of a reason that the speed control wouldn't work? The power supply doesn't use the rpm monitor. (Not thinking, I cut it off instead of running it out to the mobo)
 

Nessism

Golden Member
Dec 2, 1999
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The fan speed control is part of the power supply circutry, not in the fan itself. You should be fine. The only possible issue I can think of is that the power supply will run a little hotter now since the base line air flow will be reduced.
 

xbassman

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Feb 25, 2001
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Well, my wife said it was great, but I just checked her temps and came to a diffeent conclusion.
Her CPU load temps were running aroud 46-47C now they jumped to 55C. Cranking all her fans to 12V brought it back down to 50C, but her Aero 7+ is pretty loud @ 12V.

I don't think the Yate Loon is running full speed wired into the controller. I guess it's time to Google a bit to see if I can figure out why the controller doesn't work properly with this fan.
I might wind up wiring the fan straight to the mobo or her Sunbeam controller. I have a couple of Globe fans for my son's computer also that I could trade in.
 

xbassman

Golden Member
Feb 25, 2001
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hehe....sometimes shows that a quick Google is your best bet.

I got a hit from a SPCR review that explained the problem.

The range of the manual fan speed controller is tied to the internal thermistor. When the load and/or temperature is high, the minimum speed available goes up. Note that at 65W output, the minimum fan voltage is 3.9V while at maximum power output, the minimum fan speed is 9.5V. The maximum speed available also goes up, but not as dramatically.

Even if I was pulling full power the fan was probably never getting more than 10V. Compounding things is the fact that since it is a low rpm fan I couldn't tell any difference between minimum and max turning the dial. The controller on the Fortron maxes @ 11.3V which would only result in about 1100-1200 rpm's with this fan.

I am think I should cut take one of the Globe fans, cut the fan's built-in thermistor and short the wires together, and install it into this PS. It puts out about 20 more cfm's than the Yate Loon @ full power.