Connect with us

Motor runs but not under load

Discussion in 'Troubleshooting and Repair' started by Angellos, Nov 23, 2015.

Scroll to continue with content
  1. Angellos

    Angellos

    4
    0
    Nov 23, 2015
    Hi. What I have is a 3 phase 5hp GE motor 1170 rpm (pretty old). It has been set up with some electronics (I have no idea how this works) that convert the single phase into 3 phase. My father in law used to run it under no load and had an extension cord running off of it to run some 3ph equipment. Worked awesome. I have taken this motor and hooked it up directly to a Little Giant Power Hammer via a 4" canvas pulley. The power hammer specs call for a 2hp motor so this 5hp 3ph should have tonnes of torque. As soon as there is the slightest load it just hums and then stops. Even hand turning the belt doesn't help.
    I have tried super minimal tension (can slide the belt on and off) and still no go. Is it likely that the motor just needs a tune up or am I most likely going to need to get a proper roto-phase convertor? Really hoping to get this motor working as I've just spent almost $300 on a making a 4" belt and pulley to match.

    Thanks for your help!!
     

    Attached Files:

    Last edited: Nov 23, 2015
  2. Angellos

    Angellos

    4
    0
    Nov 23, 2015
    Should also add, I bought this hammer recently and I really need it working asap for a job I'm in the middle of. Cheers!
     
  3. Minder

    Minder

    3,103
    664
    Apr 24, 2015
    It would seem the device to produce the 3rd ph is a little primitive, if so this is probabally why it refuses to start even when under a light load,
    You either need a proper phase convertor or a VFD.
    M.
     
  4. Angellos

    Angellos

    4
    0
    Nov 23, 2015
    Shoot, I was afraid of that. Thank you
     
  5. GPG

    GPG

    452
    66
    Sep 18, 2015
  6. Angellos

    Angellos

    4
    0
    Nov 23, 2015
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-