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Fan controller/rpm monitor cable help

post #1 of 15
Thread Starter 
Hello people. I have a Lamptron FC4 fan controller that has been collecting dust for a while. I recently decided that I would try to use it along with some sort of cable so I could see the rpms of the fans. Having many spare 3 pin cables, I decided to make a monitor cable myself for the lulz (I don't have a soldering iron or heatshrink so I had to get creative). The cable works for the most part but here's the issue: when running at anything but full speed, the readings get all messed up. For example (the fan in question is AUXFANIN1):

Normal


Not normal



Here's a picture of my cable. Don't mind the random red and black cable trailing off to the side. They're just leftovers.


So what do you guys think? Is there anything super obvious I'm doing wrong? I also tried the cable without the yellow cable on the side that connects to the FC4, same thing happens.

Here's a link to the fan controller btw:
http://www.lamptron.com/products/vie...Controller_FC4
Edited by Georc - 6/14/11 at 3:01am
Georc Maximus
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Georc Maximus
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post #2 of 15
Is it the same with different fans? Maybe the "creative" way the wire is attached to the pin? I've done that many times and it's worked fine (without splitting the rpm signal though but your still having issues with that not connected). I always use a wired connector and join wire to wire further down as opposed to wire to pin - I'd really want solder for that.
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post #3 of 15
Did you have an RPM sense wire going to each fan???
That adds up all the values together 0_o
    
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post #4 of 15
Thread Starter 
Creative way: I peeled away the heatsrink from the fan extension cable, stripped the wires from another female 3-pin cable, wrapped the stripped wired around the exposed solder points of the extension, and wrapped each cable in tape for insulation. If it were because of faulty contact of the wires, wouldn't it just not read rpm at all? I tried many different configurations but this was the only one that would allow the fan controller to actually control the fan. With the black, red, or both cables connected to the mobo, the fan would just spin at 100% always. I is confuse

Quote:
Originally Posted by iCrap View Post
Did you have an RPM sense wire going to each fan???
That adds up all the values together 0_o
I did have a y-splitter connecting two fans too my ghetto cable but I cut off the rpm sensor from one of the connectors so only one fan would give the rpm signal. I also tried it with a single fan so this shouldn't be the problem.

Anyway, keep the ideas/explanations coming. I really appreciate the help
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Georc Maximus
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post #5 of 15
Test the fan directly (without your ext. cable) into the aux_fan header, and note the RPM readout. If it reads correctly, does this happen on other channels of the FC4? Other fans? And the obvious, soldered wires work best.
post #6 of 15
Thread Starter 
I was just able to confirm both that the fan's rpms are correct when plugged in directly to the motherboard (even if plugged in through the ghetto cable) and that this happens on every channel of the FC4
Edited by Georc - 6/14/11 at 3:27pm
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Georc Maximus
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Georc Maximus
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Georc Maximus
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Georc Maximus
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Georc Maximus
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