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does a psu need to have a fan connected?
Hello
Does a PC PSU require a fan to be connected? If so, would it be ok to shortcircuit the connector? The reason is that I'm installing a thermostate which handles the fan speed and thus it's not connected to the PSU anymore. -Peter |
#2
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"Peter I. Hansen" wrote in message ... Hello Does a PC PSU require a fan to be connected? If so, would it be ok to shortcircuit the connector? The reason is that I'm installing a thermostate which handles the fan speed and thus it's not connected to the PSU anymore. as long as you have some type of cooling the power supply will run with the fan removed... but be sure NOT to short out the connecter... all you do is simply remove the fan |
#3
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Peter I. Hansen wrote: Hello Does a PC PSU require a fan to be connected? It can be run safely for only a few minutes without the fan. If so, would it be ok to shortcircuit the connector? The reason is that I'm installing a thermostate which handles the fan speed and thus it's not connected to the PSU anymore. Don't short the connector or you'll overload the +12V output (if the fan runs at full speed all the time) or possibly destroy the transistor in any fan speed control circuit (if the fan speed varies with temperature). A thermostat is meant to be wired in series with the device it controls, meaning you need to cut the fan's red wire in the middle and connect its freed ends to the thermostat's terminals. The thermostat must be mounted securely and away from the high voltage section of the power supply to prevent any possibility of electric shock. That means do NOT mount it on the large heatsink next to the big cylindrical high voltage capacitors because that heatsink is insulated from high voltage by only 0.2mm of material, or it may even be connected directly to 160 volts. However the other large heatsink, close to all the wires that exit the power supply, is a safe mounting point, and if you use it the thermostat should be rated to close (not open, as most do) at about 75-80 degrees Celcius. If you instead mount the thermostat on the power supply case, use a much lower temperature rating, like 35-45C. The problem with controlling the fan with a mechanical thermostat is that the fan will alternate between complete silence and maximum loudness, so it may be better to use a thermistor rated for 30-50 ohms at 25 Celcius. |
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