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| Illustration 1 | g06121875 |
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General Information | |
The principal working component in the vibratory system is the eccentric weight. The vibratory motor rotates this weight on a shaft inside the rolling drum. The rotation of the weight generates a dynamic (or centrifugal) force that is significantly greater in magnitude than the static weight of the machine.
The machine must be operating at high idle or in ECO mode to operate the vibratory system. At high idle, the engine operates at an engine speed of 2200 rpm. When operating the vibratory system in ECO mode, the engine operates at 2000 rpm.
The rotational speed of the eccentric weight shafts determines the vibratory frequency. Frequency is expressed in Hertz (Hz) (vibrations per second) or in vibrations per minute (VPM). The vibratory frequency on the standard machine is controlled by the engine speed.
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| Illustration 2 | g06131375 |
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Vibratory Control System (1) Machine ECM (2) Display (3) Vibratory solenoid "A" (4) Engine ECM (5) Keypad (6) Propulsion lever | |
Machine ECM (1) monitors input signals from the following components to control the vibratory system:
- Engine ECM (4)
- Keypad (5)
- Propulsion lever (6)
Machine ECM (1) evaluates the input signals and determines if an output should be sent to vibratory solenoid"A" (3). The output signal is not proportional on machines with the fixed-frequency vibratory system.
Note: On fixed-frequency vibratory systems, the output signals from the machine ECM are a fixed value. Vibratory frequency on these machines is affected by engine speed. The vibratory system will only operate when the machine is operating in ECO mode or high idle.
Machine ECM (1) uses display (2) to provide information to the operator about the vibratory system during operation.
The vibratory system section of this presentation is divided into segments. The first segments show the location of all electrical and hydraulic components on the machine which are part of the vibratory system. A brief discussion of each component is provided in these segments.
The last two sections explain the operation of the electrical and hydraulic systems. Schematics are used in these segments to trace current through the electrical system and hydraulic oil through the hydraulic system.