I have no problems running a PWM fan with a normal 12V and PWM input signals. I'm wondering though what if I supply less voltage to the fan (say 5V or 7V) while keeping the PWM signal intact, will it still run across the whol 0~100% PWM range just with a lower minimum and maximum RPM?
Running a PWM fan with 5V or 7V input signal
DeepCool PWM fans will run at 7 Volts, but the PWM control is effective with 50-100% duty. At less than that, they stopped.
CM Jetflos come with Voltage reducers. However, they do not contain PWM lines. The product manager told me that he wanted to assure that the PWM function would work. Hence, by implication, he did not feel it would work properly at reduced Voltages.
GT's are server fans, but you must experiment to see if reduced Voltages are strong enough to support their PWM functions. And then post your results.
CM Jetflos come with Voltage reducers. However, they do not contain PWM lines. The product manager told me that he wanted to assure that the PWM function would work. Hence, by implication, he did not feel it would work properly at reduced Voltages.
GT's are server fans, but you must experiment to see if reduced Voltages are strong enough to support their PWM functions. And then post your results.
Yes, but until I can test them it would be good to have arguments about it. I was reading that usually the chip that's taking care of the PWM signal inside a fan is powered by 12V. So if you supply less voltage to the fan then you're effectively running the chip at an abnormal voltage which could lead to damage in the future. This is why the fan is acting all weird when supplied with 5V or 7V.
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