Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Motor

Options
  • 09-07-2010 8:52pm
    #1
    loadz
    Registered Users Posts: 106 ✭✭


    How do you megger the windings of a motor to check if its faulty and what kind of resistance should the windings be.


Comments

  • Options
    #2
    bassey
    Registered Users Posts: 936 ✭✭✭bassey


    Insulation resistance test between windings should pretty much be infinite, I think the minimum is 10 Megohms. Same with insulation resistance between windings and frame.


  • Options
    #3
    Randyleprechaun
    Registered Users Posts: 876 ✭✭✭Randyleprechaun


    Importatnt to know which terminals represent each set of windings. Not easy to see sometimes if motor is old. Also you may have to remove the links in the terminal box which join the windings in either star or delta setup.

    Test each aet od windings to see if they are open circuit.

    Each set of windings should have same resistance


  • Options
    #4
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    loadz wrote: »
    How do you megger the windings of a motor to check if its faulty and what kind of resistance should the windings be.

    The insulation resistance should be pratically infinite as said already. Remove the star or delta links from the terminals and test with multi meter between u1-u2, v1-v2, w1-w2, they can be hard to see sometimes. You should notice they are not straight across from each other. For a 1kw delta motor i think the ohms should be roughly 200 - 250 ohms for each winding, maybe a bit lower, 2kw will be half this etc. Once you find all 3 windings are ok then meggar between all 6 terminals and motor frame. Then between 3 terminals on one side to check insulation between windings ( u1-v1, u1-w1, v1-w1).
    Thats about it.


  • Options
    #5
    MarryMcC
    Banned (with Prison Access) Posts: 1 ✭MarryMcC


    Test your winding condition by testing these connections:

    T1 to T3
    T2 to T3
    T1 to T2
    The reading should be between 0.3 to 2 ohms. If it is 0, there is a short. If it is over 2 ohms or infinite, there is an open.


  • Options
    #6
    Hmob
    Closed Accounts Posts: 256 ✭✭Hmob


    MarryMcC wrote: »
    Test your winding condition by testing these connections:

    T1 to T3
    T2 to T3
    T1 to T2
    The reading should be between 0.3 to 2 ohms. If it is 0, there is a short. If it is over 2 ohms or infinite, there is an open.

    You're not making much sense there tbh


  • Advertisement
  • Options
    #7
    colm_mcm
    Registered Users Posts: 73,462 ✭✭✭✭colm_mcm


    Hmob wrote: »
    You're not making much sense there tbh

    Bit tardy with the response time too.


  • Options
    #8
    liveandnetural
    Registered Users Posts: 270 ✭✭liveandnetural


    https://www.youtube.com/watch?v=FUjZwMMoltQ


Advertisement