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Thread: VFD Application?

  1. #41
    Join Date
    Dec 2007
    Location
    NE Nebraska
    Posts
    32,543
    Quote Originally Posted by Ingenieur View Post
    so no speed change is required?

    normally 2 belts at ~50% load and full speed (each a different material)
    or when 1 is removed from service
    1 belt at 100% load and full speed (alternating product at twice the density)

    seems like a VFD is not required?

    with vfd's
    under normal conditions you could slow the belt down and load it to 100%
    no advantage
    again
    Power = work/time = weight x distance / time
    if time goes up, ie, slower at 1/2 speed
    and weight goes up, twice the material
    they offset, the P is the same
    work does increase but so does the time
    time needed to do the same work decreases, right? I'm sure you know this but think it just came out wrong.

    The only way it is worth installing the drive is if there is significant enough change of inefficiencies, otherwise the same work is being done.

  2. #42
    Join Date
    Jan 2016
    Location
    PA
    Posts
    3,460
    Quote Originally Posted by kwired View Post
    time needed to do the same work decreases, right? I'm sure you know this but think it just came out wrong.

    The only way it is worth installing the drive is if there is significant enough change of inefficiencies, otherwise the same work is being done.
    if you slow the belt down, time increases

    MORE work is being done, more weight (double the load) over the same distance

    offsetting, so same power used
    Last edited by Ingenieur; 08-15-17 at 10:58 AM.



  3. #43
    Join Date
    Sep 2008
    Location
    UK
    Posts
    9,575
    Quote Originally Posted by Ingenieur View Post
    so no speed change is required?
    Nor advantageous.
    Si hoc legere scis nimium eruditionis habes.

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