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  1. You guys were right on it and that helped sort it...

    You guys were right on it and that helped sort it out- the service disconnect for the main motor had punky contacts and were dropping a leg.

    Thanks
  2. Ok- I checked supply- all is good. This is a...

    Ok- I checked supply- all is good.
    This is a large belt sander and the 5 hp is the primary belt motor.

    The machine also has a three phase oscillating motor which works fine.
  3. Trouble shooting three phase motor- where to start.

    I have a five hp three phase motor on a machine which won’t run.
    It surges briefly- like a 1/8 turn when I connect to power and makes a deep hum but won’t run.

    Where to start troubleshooting?
    ...
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