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Elevator feedback system

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by Korama, Sep 14, 2017.

  1. Korama

    Korama New Member

    Joined:
    Sep 14, 2017
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    hello,

    sorry for my english. I’m trying to model an "elevator system" graphically using « Functionnal block diagram »

    The layout of this system is

    Capture d’écran 2017-09-13 à 15.20.24.png
    My block diagram
    Capture d’écran 2017-09-14 à 16.16.19.png

    1. Please is my model correct ?

    2. if i’m in level 2 and want to go to level 3 .is the input of command card in this case will be

    Level desired : 0011

    Position sensor : 0010

    Is that mean i will have 4 signals for level desired and 4 signals for position sensor ?

    For braking I assumed that the control will be binary 0 if the engine is running and 1 if the engine stops. However in the description of the system (figure attached) they propose different brake control !!!
     
  2. mbarazeen

    mbarazeen Member

    Joined:
    Aug 2, 2006
    Messages:
    745
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    Location:
    saudi arabia, srilanka
    I am not sure about the type of block diagram you are referring to, you have position sensing, motor forward & reverse command, brake sensing & braking functions.
    your block diagram should compare current Level & decide the direction
    keep on driving to that direction until set level is reached.
    then stop motor and check for position for brake to be reached
    apply brake.

    Regarding digital part of the control
    since you have only 4 positions (levels) its ok to have 2 digit binary coding (00,01,10,11)
    the braking here is based on sensor too, when both the level and brake positions are similar - apply brake.
     

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