Possible to Detect Fan Failure Electrically? - Page 2
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  1. #21
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    Here's yet another way. This IC is designed to monitor 2-wire fans.

    https://datasheets.maximintegrated.c...ds/MAX6684.pdf

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  3. #22
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    Quote Originally Posted by Monarchist View Post
    All extra work, "Engineering", fabrication, components - higher costs in general - when the fan makers basically provide a proven low-hassle solution for free.
    Even the tach requires circuitry to detect it. While that may be just connecting to a digital port and programming to detect the pulses and deal with their absence.

    Quote Originally Posted by RC Mech View Post
    Knowing little about wrangling electrons outside of programming and PLC's, what is an elegant solution to detecting a fan failure on a monitored circuit?

    Mercedes, Audi etc. have a bulb detection system that measures resistance on the circuit to alert the driver of a burned bulb. Infinite resistance = warning light, and position of said bulb.

    If an enclosed fan (plain-Jane 6" square, electronics cooling, 24VDC OR 120VAC are options) fails, I'd like to be able to have that as an input to a controller. The fan failure would be a burn-out like in the case of a bulb. Measure infinite resistance on the circuit? A method to measure current draw in real time and then program based on that input?

    What's the sophisticated, elegant way of doing this?

  4. #23
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    I think the vane switch is the right choice.
    It detects fan failure no matter open, shorted, jammed.
    It requires the simplest of connections, not caring what voltage ac dc sourcing sinking.
    That's assuming there is space and appropriate mounting options.
    Also that orientation is stable and vibration is not too bad.


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