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  1. #11
    Quote Originally Posted by Boyan Silyavski View Post
    A bit off topic. Now i need your help here.
    It's not in the operator's manual, it's in the Parameter List

    You need
    P0003 set to 2 so that all the parameters you might want to change are accessible to you
    P0700 set to 1 for command input to be BOB (panel)
    You might need to select the control frequency setpoint source and a few other odds & sods but the Parameter List is where you'll find the settings described -

    http://www.acpd.co.uk/sei/s/1488/f123.pdf

    Regards,
    Nick

  2. #12
    Quote Originally Posted by Noplace View Post
    lots of great information surfaced in the thread, appreciate if you can just let me know what would be the problem in using a 1ph VFD?
    It's 1 phase input but it's 3 phase output for use on a 3 phase motor, not a single phase motor.
    You can buy a good new 1hp 3 phase motor for around 120, once you've tried a drill press with an inverter you'll never go back, jus do it ;-)

  3. #13
    Somebody know where they sell cheapest the 500w variable speed DC motor for the small chinese mills?
    project 1 , 2, Dust Shoe ...

  4. #14
    Quote Originally Posted by Boyan Silyavski View Post
    At how many Hz you run it and hows that that it still works?
    I've just finished a small run of parts and checked, 7000rpm is 117.6Hz

  5. #15
    Quote Originally Posted by Noplace View Post
    lots of great information surfaced in the thread, appreciate if you can just let me know what would be the problem in using a 1ph VFD?
    got my eye on this one http://www.ebay.com/itm/0-75kw-Frequ...16402#shpCntId and seems it would work, am I missing something?
    As Magicniner has said, these VFDs take single-phase in and produce a 3-phase output that is designed to drive a 3-phase motor. Why can't you just use two of the output connections and drive a single-phase motor? Main problem (there are others) is that the motor will probably not start unaided. Single-phase motors have some clever bits in them to get them started from stationary; you often hear a click from inside the motor as they spin up to speed. This is the centrifugal switch cutting out the starter circuitry (often a capacitor bolted to the outside of the motor). This is all designed to run at a single speed. Imagine a children's swing in a playground. It swings at a steady speed, and you just need to give it a nudge at regular intervals to keep it swinging. That's the way a single-phase motor works, where the incoming alternating voltage generates a magnetic "pulse" that is synchronised with motor revs. 3-phase motors work differently - the three phases generate what looks to the motor like a rotating magnetic field at the frequency of the input voltage, and the motor follows this whatever (within reason) the speed. Obviously, it's all a bit more complicated than that, but I hope that this helps.

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