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Thread: Down Hill Conveyor

  1. #1
    ash_bhatnagar Guest

    Down Hill conveyor

    Is it possible to use a VVVF drive on a regenerating downhill conveyor?

  2. Yes. Bolani Ore Mines of SAIL has a system of downhill conveyors with VVVF and regenerating power.

  3. #3
    ash_bhatnagar Guest

    VVVF for downhill conveyor

    Thanks alot for yr reply.

    Is it possible for you to further elaborate and give some technical details as to how the generated power is utilised.

    Also some technical and profile details fo the conveyor

  4. #4
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 Month professional experience

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    Dear Ash:

    I applied the first VFD to dowhill conveyors in 1977 at the La Caridad mine in Mexico. This was the first use of inverters on belt conveyors in the world. Conveyor Dynamics, Inc. has now installed many VFDs on downhills.

    You can apply VFD to downhill conveyors in two ways:

    1. 4 quadrant contol is required if you leave the VFD drive on-line.
    This has been done on many installation around the world.
    CDI has a number of VFD in Brazil for MBR and MRN mines,
    Los Pelambres mine 25,000 kW in Chile, and many others.

    2. 1 quadrant VFD control can be used if you transfer the drive
    off-line once full speed is reached suing a line-synch transfer.
    This was the way La Caridad was designed. Phelps Dodge
    Morenci mine uses the same aproach on a 6000hp downhill
    installed in 1990. This concepts requires two MCC's for each
    motor controlled by the VFD. Furthermore, this allows the
    VFD to be used on other conveyors. At La Caridad, I started
    20 motors with 4 inverters configured with uphill and downhill,
    fabric and steel cord belts, and with different motor drive
    power ratios. This concept is more tricky in that you have to
    know how motors load share to deveoped a proper design for
    the transfer phase.

    We are experts in this field and are happy to help

    Lawrence Nordell
    President
    Conveyor Dynamics, Inc.
    email: nordell@conveyor-dynamics.com

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