CP-563E, CP-573E, CS-563E, CS-573E and CS-583E Vibratory Soil Compactors Vibratory System Vibratory System Caterpillar


Vibratory System
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1.1. Electrical Block Diagram and Hydraulic Block Diagram
2.1. Operation of the Vibratory System
3.2. Vibratory System OFF
4.2. Vibratory System ON

Electrical Block Diagram and Hydraulic Block Diagram




Illustration 1g00937569

Block Diagram

(1) Switch (throttle)

(2) Switch (on/off)

(3) Switch (vibratory amplitude)

(4) Rheostat (vibratory frequency)

(5) Controller (vibratory frequency)

(6) Tachometer (vibratory)

(7) Sensor (vibratory speed)

(8) Hydraulic oil tank

(9) Oil cooler

(10) Suction screen

(11) Thermal bypass and return manifold

(12) Vibratory pump

(13) Charge pump

(14) Vibratory charge filter

(15) Vibratory motor

(16) Vibratory control solenoid

(AA) System pressure

(AB) Charge pressure

(AC) Sump

(AD) Activated components

The electrical system for the vibratory system consists of the following components:

  • Throttle switch (1)

  • On/Off switch (2)

  • Vibratory amplitude switch (3)

  • Rheostat for the vibratory frequency (4)

  • Vibratory frequency controller (5)

  • Vibratory tachometer (6)

  • Vibratory speed sensor (7)

  • Vibratory control solenoids (16)

The vibratory hydraulic system consists of the following components:

  • Hydraulic oil tank (8)

  • Oil cooler (9)

  • Suction screen (10)

  • Thermal bypass and return manifold (11)

  • Vibratory pump (12)

  • Charge pump (13)

  • Vibratory charge filter (14)

  • Vibratory motor (15)

The vibratory electrical system controls the hydraulic system for the drum vibration. The circuit turns the vibration system ON and OFF. The circuit also controls the vibration amplitude: HIGH and LOW. The vibratory system can also control the frequency of the vibrations with the optional controller.

With the key start switch in the ON position, the main relay will close and system voltage will be present at the throttle switch (1) .

Place the throttle switch (1) in HIGH position. Voltage will be present at the vibration control switch (2). When the vibration control switch (2) is pressed, the switch will close. The switch will create a path to the switch for the vibratory amplitude control (3) .

For systems without the optional frequency control (5), the circuit will continue to the solenoids on the vibratory piston pump (12). When the switch for the vibratory amplitude control is in the HIGH position, full voltage is supplied to one of the vibratory control solenoids (16). This allows the oil to flow to the vibratory motor. The motor will spin the eccentric weights in one direction. When the switch for the vibratory amplitude control is in the LOW position, full voltage is supplied to the other vibratory control solenoid (16). This allows the oil to flow in the opposite direction to the vibratory motor. The motor will then spin the eccentric weights in the other direction.

For systems with the optional frequency control (5), the circuit will continue to the controller (5). When the switch for the vibratory amplitude control (3) is in the HIGH position, full voltage is supplied to the controller (5). The controller will then vary the voltage to one of the vibratory control solenoids (16) in relation to the position of the rheostat. This will vary the flow of oil to the vibratory motor. The motor will spin the eccentric weights in one direction at varying speeds. Thus, the frequency of the vibrations will change. When the switch for the vibratory amplitude control (3) is in the LOW position, full voltage is supplied to the controller (5). The controller will then vary the voltage to the other vibratory control solenoid (16) in relation to the position of the rheostat. This will vary the flow of oil in the opposite direction to the vibratory motor. The motor will spin the eccentric weights in the other direction at varying speeds. Thus, the frequency of the vibrations will change.

The vibratory system is equipped with a monitor that is standard with the optional frequency control. The monitor is standard with the basic pump controller. A speed sensor (7) measures the revolutions of the eccentric weights. A signal from the speed sensor (7) is sent to the vibratory tachometer (6). The tachometer (6) will then display vibrations per minute.

Charge pump (13) provides the charge pressure oil for vibratory pump (12). The vibratory pump is a variable displacement piston pump that is controlled by solenoid valve (16). The solenoid valve (16) is controlled by vibratory amplitude switch (3) or optional vibratory frequency controller (5) .

Vibratory pump (12) delivers oil to vibratory motor (15). The vibratory motor is a bidirectional hydraulic motor. The vibratory pump will deliver oil to both directions of the vibratory motor. This allows the vibratory motor to spin the eccentric weights in either direction.

See "Vibratory Electrical System" for a more detailed explanation.

Operation of the Vibratory System

Vibratory System OFF




Illustration 2g00941145

Vibratory System OFF

(8) Hydraulic oil tank

(9) Oil cooler

(10) Suction screen

(11) Thermal bypass and return manifold

(12) Vibratory pump

(14) Vibratory charge filter

(15) Vibratory motor

(AA) Charge pressure

(AB) Sump

(AC) Activated components

This graphic shows the vibratory hydraulic system when the control switch for the vibratory amplitude is OFF. The charge pump generates flow when the engine is running. Charge oil flows to vibratory charge filter (14). Filtered charge oil returns to vibratory pump (12) and flows to the makeup and relief valves, the direction control valve, and the charge relief valve.

With the control switch for the vibratory amplitude OFF, the direction control valve is in the center position, and both sides of the pump servo are open to the pump case. The swashplate in the vibratory pump remains at a minimum angle, and the vibratory motor does not rotate.

Charge pressure acts on the charge relief valve. When charge pressure reaches 2800 kPa (406 psi), the oil pressure overcomes the force of the spring and the charge relief valve opens. This directs the oil flow from the charge pump back to the pump case.

Charge pressure acts against the makeup valve. If the pressure in either the loops for the high amplitude or low amplitude falls below charge pressure, the makeup valve will open and charge oil will flow into the loop.

Since the machine is not moving, the flushing valve in the vibratory motor remains in the center position.

Vibratory System ON




Illustration 3g00941307

Vibratory System ON

(8) Hydraulic oil tank

(9) Oil cooler

(10) Suction screen

(11) Thermal bypass and return manifold

(12) Vibratory pump

(14) Vibratory charge filter

(15) Vibratory motor

(AA) First pressure reduction

(AB) System pressure

(AC) Charge pressure

(AD) Sump

(AE) Activated components

This graphic shows the vibratory hydraulic system when the control switch for the vibratory system is ON, and the control switch for the vibratory amplitude is in HIGH amplitude.

In this condition, the high amplitude solenoid is energized, and the right valve section of the direction control valve is active. Charge oil enters the servo piston cavity of the high amplitude side of the pump, and the oil then overcomes the force of the spring. This will cause the pump servo piston to change the angle of the swashplate.

Supply oil from the high amplitude side of vibratory pump (12) flows to the high amplitude side of vibratory motor (15). This causes the motor to rotate. After turning the motor, oil that is reduced pressure will return to the side of the vibratory pump with low amplitude. This completes the circuit.

Supply oil also flows to the makeup valve, to the relief valves, and to the flushing valves of the high amplitude side. The makeup valve in the circuit for high amplitude remains seated and the relief valve will remain closed when the pressure in the circuit for high amplitude is between charge pressure and relief pressure.

Oil in the circuit for high amplitude acts against the top of the flushing valve, and oil in the circuit for low amplitude acts against the bottom. The flushing valve spool moves downward. This allows oil in the circuit for low amplitude to flow across the spool to the relief passage of the flushing valve. When the pressure in the circuit for low amplitude is greater than 1600 kPa (232 psi), the flushing valve will open in order to allow oil that is in the circuit for low amplitude to flow through the case drain lines for the vibratory motor.

When the pressure in the loop for low amplitude falls below charge pressure, the makeup valve will open. This causes charge oil to flow into the loop for low amplitude. When the pressure in the loop for low amplitude rises above charge pressure, the makeup valve closes.

Note: The orifice in the flushing valve ensures that a maximum of 5 L (1.39 US gal) of oil in the low pressure side of the circuit is directed to return manifold (11) .

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