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Thread: Magnetic run indicator - GIF

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    Altair's Avatar
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    nova_robotics (Oct 15, 2020), yves78 (Oct 16, 2020)

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    Interesting, I have used a number of Grundfos pumps in several hydronic systems I have installed. They are very reliable, water lubricated.

    I do wonder, if that little detector is reading magic fields are "rotating" as they do with the rotor spinning as it should. OR, if the rotor is stuck, just the magnetic fields that are trying to spin the locked rotor would cause the detector to spin, even though the rotor is locked.

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    Quote Originally Posted by hemmjo View Post
    Interesting, I have used a number of Grundfos pumps in several hydronic systems I have installed. They are very reliable, water lubricated.

    I do wonder, if that little detector is reading magic fields are "rotating" as they do with the rotor spinning as it should. OR, if the rotor is stuck, just the magnetic fields that are trying to spin the locked rotor would cause the detector to spin, even though the rotor is locked.
    That's an excellent point. The rotating magnetic field is going to rotate. You could probably pull the rotor and still get a reading (before the breaker tripped).

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    Type of compass

    Thanks, it's a very interesting way to diagnose if the pump is working !
    At first I thought it was a simple compass, but I discovered it's a specific grundfoss accessory. Will see how to order one.

    Thanks again !

    Quote Originally Posted by Altair View Post
    Magnetic run indicator.

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    Previously:

    Variable field magnet motor - GIF
    Pneumatically-actuated magnets - GIF
    Magnet paper for revealing location of magnets inside devices - GIF
    Dropping a magnet through a hollow copper bar - GIF



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    Last edited by yves78; Oct 16, 2020 at 02:36 PM.

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