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Lamptron FC5 fan controller, only runs fans at full speed?

Last response: in Components
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July 13, 2014 3:29:49 PM

I don't know if this is normal, or whether I have a faulty controller.

I've got a selection of different fans all connected up to the fan controller, 2 scythe gentle typhoons on a rad, a noiseblocker eloop on exhaust, and a larger 200mm NZXT fan on intake. It's a 650d so intake fans are pretty limited :/ 

As soon as I turn the dials on the controller, the fans just go straight to their full speed, 1440 for the scythes and 1200 for the noiseblocker. Even if I turn the knobs right to the very lowest setting, they might flicker at a lower rpm but then slowly pick up to max speed.

I bought the fan controller so I could slow the fans down when I'm not gaming to reduce noise. But I can't seem to control their speed at all. They're not PWM fans, but the lamptron fan controller only accepts 3 pin fans anyway so I can't see that being the issue.

Any input would be useful.

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July 13, 2014 7:12:25 PM

If you have a voltmeter, measure the voltage the fan controller provides at various speeds. If the fans are 3-pin, then the only way to moderate speed is to regulate the voltage. SO measuring the voltage will tell you if the fan controller is defective.
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July 14, 2014 9:55:43 AM

Karsten75 said:
If you have a voltmeter, measure the voltage the fan controller provides at various speeds. If the fans are 3-pin, then the only way to moderate speed is to regulate the voltage. SO measuring the voltage will tell you if the fan controller is defective.


I popped my voltmeter on all the terminals one by one, and they do drop voltage from 12v but only for the first 2 degrees of the turn, then it's straight to 12v. So trying to slow the fan speed you have to literally do turns finer than the width of a hair. Must be a dodgy controller, which is annoying because I bought it about 6 months ago and can't return it now.
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