xonix

I just got my hands on FIVE San Ace DC fans.

They are all the same model: 109R1224H1071.
They have only 2 wires coming out from the motor (no speed control wire).

I've searched online for their specifications but to no avail..

If anyone can help, it would be much appreciated!

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tagurtoast

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Chunky_Chimp

I didn't find anything on that model, either, but a 12-volt version of yours was found and determined to be the H1011 with a power connection customized for Dells. So think of yours as that, only running on 24 volts and with no RPM sensor/control lead as you said.

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xonix

OIC! So the 1224 means 120mm, 24V.. but what does the H1071 mean?

And also, if I run these fans on a normal computer PSU, it would either 1) throttle down the RPMs or b) not start up at all, correct?

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Chunky_Chimp

I'm not sure what 1071 means, but it's most likely indicating its Dell-optimized power connection.

Correct, you need something to give it a 24v supply. Making a 24v rheostat and wiring it to run off of a normal power supply sounds like the best option, but it would be somewhat time-consuming.

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xonix

Thanks Chimp!

Yes, I think the H1071 translates to the type of connection head it uses..
I was mistaken when I thought all 5 I have are H1071's; Only three of them are H1071's, the other two are H1051's with different headers.

Also, is there a guide or something on how to make a rheostat (I don't even know what that is..)

I was thinking of using a completely separate PSU for these fans so I can power them on and off without powering down the computer itself. Plausible?

+Rep Chimp! Top stuff!

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Chunky_Chimp

Yes, this is actually a better option, however 24vDC power supplies are quite expensive and the fans might be a little loud if you try to run them full-blast like that.

As for how to make a rheostat, there are plenty of guides, but I'm not sure if they can apply to a 24vDC power source.

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