1. #1
    Guys

    I'm just doing a single to 3 phase conversion on a lathe and just ordered a 3HP (2.2kw) phase inverter for it. I'm have to redo all the electrics completely and want to add a contactor and mcb fuses (replace the old ceramic bulb type). When i did my mill conversion i changed the motor to a single phase motor and reused the existing contactor without much thought. The question is should i rate the contactor at the fuseable value of the inverter (25amp) or go much higher?

    Cheers
    If the nagging gets really bad......Get a bigger shed:naughty:

  2. #2
    Quote Originally Posted by 2e0poz View Post
    The question is should i rate the contactor at the fuseable value of the inverter (25amp) or go much higher?

    Cheers
    That seems to be too high, i have a rotary inverter 5HP that is rated at 25amps

    Phil

  3. #3
    Have a look at the manual here.

    https://www.inverterdrive.com/group/...W/default.aspx

    This is the unit i have ordered
    If the nagging gets really bad......Get a bigger shed:naughty:

  4. #4
    it actually says 22amp on page 108
    If the nagging gets really bad......Get a bigger shed:naughty:

  5. When you say contactor, do you mean independently of the MCB, which should be 25A. If so the contactor needs to be rated for 25A switching, not carrying..

  6. #6
    Yes Irving i do
    If the nagging gets really bad......Get a bigger shed:naughty:

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