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| Driving bigger fans in my 3D printer... |
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| Bug2k17:
The board in my ctc 3d printer has a port for adding an extra fan, I've used it with a small 40mm 24v fan without problems for a while. I am trying to power 2 80mm 12v fans (in series) from this output. It does work but heat and smell produced tells me this is not going to work long term. Measuring the voltage at the socket with the fan off gives, +24.2v and +22.3v, with the fan switched fully on gives +24.2 and ~+0.4v. I though perhaps something like a tip120 or tip125 (as I already have some of these!) might be able to drive the fans, but I really can't get my head around how this is going to work. I would appreciate any advice on how drive the fans from an output like this. Thanks. |
| Siwastaja:
You can't drive fans (or any motors, for that matter) in series. The current never balances properly, and one ends up getting too much voltage. Use two 24V fans in parallel instead. |
| james_s:
While it's generally not advisable, I don't think that's the problem here. It sounds to me like the driver is overheating due to the current draw of the larger fans. Do you have a schematic? What controls the fans in the existing setup? |
| Bug2k17:
This socket has the part 7R030 next to it, a quick google brings up this https://www.nexperia.com/products/mosfets/power-mosfets/PSMN7R0-30YL.html which looks like the correct package.That spec looks like it should handle a couple of fans easily? |
| james_s:
Assuming it's being driven into saturation it should. Is that the part that's getting hot? |
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