Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 565 views

    LMI

    Uploaded by

    Lakbir
    The document discusses the LMI (Load Moment Indicator), a safety device that monitors crane loads and operations to prevent overloads and dangerous conditions. It works by comparing actual load conditions to load charts and safety rules. It gauges factors like boom angle, length, and cylinder pressures to determine the load. It alerts the operator if issues like overload, rope overload, or the hook blocking are detected. The LMI must be configured for each machine by the operator, and relies on accurate information. It is considered a safety device when required by certification rules. The document outlines how the LMI recognizes the machine configuration and senses loads, and how it outputs warnings to the operator display.

    Copyright:

    © All Rights Reserved
    Download as PPS, PDF, TXT or read online from Scribd

    LMI

    Uploaded by

    Lakbir
    565 views42 pages
    The document discusses the LMI (Load Moment Indicator), a safety device that monitors crane loads and operations to prevent overloads and dangerous conditions. It works by comparing actual load conditions to load charts and safety rules. It gauges factors like boom angle, length, and cylinder pressures to determine the load. It alerts the operator if issues like overload, rope overload, or the hook blocking are detected. The LMI must be configured for each machine by the operator, and relies on accurate information. It is considered a safety device when required by certification rules. The document outlines how the LMI recognizes the machine configuration and senses loads, and how it outputs warnings to the operator display.

    Original Description:

    CEC des grues Terex

    Copyright

    © © All Rights Reserved

    Available Formats

    PPS, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document discusses the LMI (Load Moment Indicator), a safety device that monitors crane loads and operations to prevent overloads and dangerous conditions. It works by comparing actual load conditions to load charts and safety rules. It gauges factors like boom angle, length, and cylinder pressures to determine the load. It alerts the operator if issues like overload, rope overload, or the hook blocking are detected. The LMI must be configured for each machine by the operator, and relies on accurate information. It is considered a safety device when required by certification rules. The document outlines how the LMI recognizes the machine configuration and senses loads, and how it outputs warnings to the operator display.

    Copyright:

    © All Rights Reserved
    Download as PPS, PDF, TXT or read online from Scribd
    Download as pps, pdf, or txt
    565 views42 pages

    LMI

    Uploaded by

    Lakbir
    The document discusses the LMI (Load Moment Indicator), a safety device that monitors crane loads and operations to prevent overloads and dangerous conditions. It works by comparing actual load conditions to load charts and safety rules. It gauges factors like boom angle, length, and cylinder pressures to determine the load. It alerts the operator if issues like overload, rope overload, or the hook blocking are detected. The LMI must be configured for each machine by the operator, and relies on accurate information. It is considered a safety device when required by certification rules. The document outlines how the LMI recognizes the machine configuration and senses loads, and how it outputs warnings to the operator display.

    Copyright:

    © All Rights Reserved
    Download as PPS, PDF, TXT or read online from Scribd
    Download as pps, pdf, or txt
    of 42

    L.M.I.

    GENERAL PRESENTATION
    +
    EXPLANATIONS
    ON 3B6 SYSTEM
    MAINBASICS
    PURPOSES
    • The LMI is a safety device* that respects the load charts
    and avoids the overloads.
    • It works helping the operator and warning him when
    approaching some dangerous conditions recognized by
    the system.
    • It compares the condition with the load charts and the
    working rules given by the program in the CPU.
    • It must be set by the operator about machine
    configuration, under his responsibility: it is NOT able to
    recognize if the info given by the operator is correct or
    not.
    MAIN PURPOSES
    BASICS

    • In case the machine brings the CE certification the LMI


    is considered a safety device and it must be always
    working.

    • When the machine isn’t CE and it works out of the


    countries where CE rules are requested, the LMI is to
    be considered only an help to the operator and the
    machine may be working while the CE isn’t.
    MAIN SAFETY STOPS

    • OVERLOAD: The weight, compared with respect to the


    load charts, is more than the maximum allowed by the load
    chart in that position
    • ROPE OVERLOAD: The weight, compared to the max rope
    stress, is allowed by the load charts but it is too much for that
    number of rope lines
    • A2B: The hook block is going against the head of the boom
    • I.s.a.a.c. : the boom is going out of the working area set by
    the operator.
    BASICS:
    BASICS
    HOW IT RECOGNIZES
    THE LOAD
    • Gauging the boom angle
    • Gauging the boom length
    [ Load radius ]
    • Gauging the pressure inside the bottom
    chamber of the boom hoist cylinder
    • Gauging the pressure inside the rod chamber
    of the boom hoist cylinder
    [ Differential force in hoist cylinder ]
    SIMPLIFIED SKETCH

    DISTANCE
    (LOAD RADIUS)

    FORCE (LOAD)
    SKETCH
    • Boom lenght
    • Boom angle

    RESULTS:
    - LOAD RADIUS ( R )
    - BOOM HEIGHT ( H )
    P1

    P2

    P1
    F

    P2
    F2
    Fdiff = F1 - F2
    F1
    P1
    U²MIC

    DISPLAY

    MAIN BOARD

    Pressure
    transducers
    Boom lenght sensor Sensors
    Boom angle sensor
    View DISPLAY
    (& CPU)

    HEAD BOX
    Sensors Pressure
    transducers

    Boom lenght sensor Boom angle sensor


    HOW IT RECOGNIZES
    THE MACHINE CONFIGURATION

    • Outriggers position : given by the operator*


    • No. of rope lines : given by the operator*
    • Presence of jib/rooster sheave : given by the op. *
    • How it recognizes
    Turret swing sector (front or lateral)  microswitch
    •
    the machine
    IV element state (engaged or dis.ged)  prox.ty switches (RC35)
    • Boom extensions  small cable reel attached to the T1’s head
    configuration
    (T1 w/respect to the others on A600, RC45, TCC-60, TCC-45)
    • Chassis level (only on TCC range)  angle sensor (CAN)
    • Turret swing angle (only with full i.s.a.a.c.)  encoder
    • Position of the swing lock pin  proximity switch
    * = under the operator’s responsibility : the
    L.M.I. system is NOT able to recognize if the
    info given by the operator is correct or not.
    INPUT IV element Analog signals
    (U²MIC)
    prox.ty swiches Digital signals

    DISPLAY

    MAIN BOARD Encoder


    (optional)

    Small cable reel


    Extension potmtr. Sensors
    Microswitch for
    ±3°switch

    Microswitch for
    CPU uperstr. locking

    A2B Switch
    DISPLAY
    INPUT (& CPU)
    (View)

    Engine diagnostic
    (Only for TCC range)
    IV element prox.ty
    swiches
    Microswitch for
    (just on A350; RC-35)
    ±3°switch
    HEAD BOX

    Sensors
    Microswitch for
    turret locking

    Encoder
    (optional)
    OUTPUT (U²MIC) output

    MAIN BOARD
    DISPLAY

    RELAY

    CPU PILOT PRESSURE


    ELECTROVALVES

    TLSCP
    EL.VALVES
    (RC45-RT440
    OUTPUT (View) output

    HEAD

    DISPLAY (CPU)

    PILOT PRESSURE
    ELECTROVALVES

    LIGHT AND
    BUZZER ALARM TLSCP
    EL.VALVES
    (RC45-RT440
    OUTPUT - NOTES:

    • When the LMI is in alarm situation it doesn’t control the


    telescope electrovalve therefore they have to be switched
    manually (RC-45, TCC-45)
    • Telescope and hydr. pilot electrovalves are normally closed,
    they open when under 24V feeding.
    • IN/OUT communication to and from the display is CAN bus
    • fserfe
    A2B
    A2B
    WORKING POSITION

    WARNING POSITION
    HOWIT
    HOW ITWORKS
    WORKS

    • Basics, feeding, installation


    • Analog signals
    • Digital signals
    • Diagnostic
    • Troubleshooting basic methods
    / 0 - 15V
    FEED

    Boom length
    Potentiometer 5V

    SEND ANALOG
    SIGNAL TO THE
    MAIN UNIT
    Boom angle 5V
    potentiometer

    Pressure
    transducers
    15V
    BOOM LENGHT BOOM ANGLE
    POTENTIOMETER POTENTIOMETER

    A B

    - Multi-turns - A: new version


    - 2k resistance value - B: pendulum version
    - Same in all versions - Mounted in the small reel
    - Same in the main cable reel but not used (spare)
    and in the small cable reel - Approx. value: 500 mV @ 0°
    - Approx. range: 0,25V ÷ 4 V - Both analog but version A is
    - It could be damaged basically double function.
    reaching the swing extremity

    *= to be always checked on the spare parts catalogue


    PRESSURE TRANSDUCERS
    L E
    MP
    S A
    CAN-BUS terminal board U²MIC Main Board
    For DISPLAY data communication
    O
    P
    T
    I
    O
    N
    A
    L
    S

    GENERAL
    ANALOG DEVICES PINS DIGITAL IN/OUT PINS POWER
    Terminal board for power supply, Terminal board for digital in/out
    ground and return signals to/from signal as A2B, ±3°switch, coils pilot SUPPLY
    potentiometers , pressure transducers. signal etc... (24V)
    WIRINGS - NOTE:

    • In all wirings bringing analogical signal be sure the shield


    is well connected in both extremities.
    • Testing the signals’ voltage, take always its relevant
    ground pin.
    • It is important to disconnect the batteries before any
    welding process on the machine, even if it is in the lower
    structure.
    • The working of the LMI system may be disturbed by
    electromagnetic interferences : be sure to avoid the
    influence of high voltage, mobile phones and other
    microwaves flows.
    • The LMI feeding is under protection by a 10A fuse.
    HEAD

    Differenze U²Mic / View


    Overload Rope Ovrl A2B Isaac
    Hook lifting
    Telescoping out

    U²MIC Boom descent


    Swing
    Boom lifting (*)
    (*) When fitted

    Overload Rope Ovrl A2B Isaac


    Hook lifting
    Telescoping out

    View Boom descent


    Swing (*)

    Boom lifting
    (*) Only with full ISAAC including “wall” function
    By pass
    BY PASS
    WHAT IS THE BY-PASS?

    • The by pass is
    BY PASS

    • By-pass may create dangerous conditions, any accident or


    damaging is out of Terex’s responsibility
    • By-pass allows the machine to work with load beyond its normal
    capability, overloading the structure.
    • Most of the by-pass episode are recorded in the black box
    memory (about 900 lines).
    • In the View tech version actually mounted on TCC range / RC-60
    / RC-30, the key switch controls a relay that feeds the button for
    15 min. On the others machines with View-tech, it holds
    activated.
    BY PASS

    • U²Mic: Activating the key, the output pin to the relay is


    continuously on ,the key by-passes all functions
    allowing the LMI going ahead calculating and showing
    data and details. In this way is possible to skip alert for :
    overolad (also for max angle) ; A2B, rope overload,
    block due to the I.S.A.A.C. etc…
    • View Tech: Once the external key is switched, the
    power supply feeds the button which bypasses all block
    as above but the operator is obbligated to use it only to
    skip alert for overloads and i.s.a.a.c.: the display has got
    relevant buttons to by pass A2B and max angle block.
    From display
    FULLY EXTENDED
    BEAMS

    HALF EXTENDED
    BEAMS

    ON TYRES
    I.S.A.A.C.
    • Interactive Space Advanced Automatic Control
    • It memorizes a position set by the operator and it
    doesn’t allow to overhead this maximum measure
    (boom angle, load radius bomm height)
    • liug
    Max angl Max hgt max rad
    Hook lifting
    Telescoping out
    Boom descent
    Swing
    Boom hoist (*)
    (*) Always fitted when isaac is on

    You might also like