That is how you 1) find the power pins for a 4-pin PWM fan, and 2) yes, you can power the fan for 100% speed with just two of four pins. Although, adding a capacitor across the power lines with a PWM signal is cleaner, but that is another topic. This is exactly how 3d printers control their mainboard cooling fan (e.g. You can even pulse the power wires (it is still considered PWM) for low-power fans. Nitpickers will nitpick, but this has worked for ages for cooling fans in computers and 3d printers. This is how you find your power pins for the 3-pin and 4-pin PWM fans if you want to run them at 100% duty (no PWM signal at all - a floating pin). If you blow on a fan hard, it produces a voltage. Why does this work? If you power a typical (single-phase) DC cooling fan, it spins. You should only need to try this at most twice. Next, with a can of compressed air (not by touching or blowing), get the fan spinning and see if you can observe something close to the 5V, 12V, or 24V (what your fan is rated for). 108,160 221 50 Featured Download By Core3D core3d.tech Follow More by the author: About: Avid 3D printer builder, currently completing my 3rd printer design. So, to answer the OP's question and help Googlers years in the future, try this:Īttach a voltmeter to any two adjacent pins/wires (power pins are usually adjacent). I have four black wires on my 4-pin PWM Arctic and Noctura fans because I use my own PWM cables. I dont quite get why one of the fans is connected with the 5-pin connector. Or, rather, that it has two 4-pin fan connectors, and one 5-pin fan connector. Which in turn connects to two 4-pin fans, and one 5-pin fan. Is it possible to disconnect this connector piece and connect the individual wires directly? (red and black?)ĭo you have red and black wires? I don't. It looks like the 6-pin connector is for (what we call in automotive terms) a wiring harness. If you interpret this differently, ask the OP to clarify. I interpret this as "I want to power my fan and have it running at 100% speed". Is it possible to disconnect this connector piece and connect the individual wires directly? (red and black?) I currently have a fan with a 4-pin connector that I want to power, but I do not have a power supply with a 4 or 8-pin connection. How to connect a 4-pin (3-pin) connector to a power supply? If you came here from Google with the question:
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