PLATE-THRUST 9U9486 - Caterpillar

Illustration 1 g01354203
Illustration 2 g02458076
Schematic of the "Implement Lockout Function" circuit.The "Implement Lockout Function" allows the operator to disable all implement functions, the joystick steering function, and the machine flood lamps. The operator can use the Implement Lockout button found on the Soft Switch Panel (SSP) to set the lockout function. The operator can also raise the left armrest in order to command the Machine ECM to lockout the implements. Implement lockout can be requested by pressing the SSP button at any time during machine operation regardless of the position of the left armrest.Under certain conditions, the ECM will activate the "Implement Lockout Function" without a command from the operator. The ECM is programmed to active the function to protect equipment or personnel that are around the machine.The ECM will use the Implement Lockout Solenoid with the Implement Lockout Relay in order to disable the machine systems.During normal machine operation (no Implement Lockout request), the ECM energizes the Lockout Solenoid and the Lockout Relay to enable the implement system.When the left armrest is down and the SSP button is pressed to turn ON the Lockout Function, the ECM will de-energize the following:
The "Lockout Solenoid".
The "Lockout Relay".De-energizing the Lockout Solenoid disables the pilot hydraulics for all auxiliary and high pressure hydraulic systems. De-energizing the Implement Lockout Relay disables the machine flood lamps and the joystick steering function. In addition, the ECM will disable the Medium Pressure Port A and Port B solenoids, the HCR/Offset Boom solenoids and the boom float solenoids.During normal machine operation when the Implement Lockout Function is OFF, the Implement Lockout Relay is energized by the ECM. This allows system voltage from the Implement Lockout Fuse to be directed through the closed Implement Lockout Relay contacts to the Joystick Steering Switch and to the flood lamp switches. When Implement Lockout is requested, the ECM will turn OFF the sinking driver output for relay. This results in the system voltage not being able to reach the steering switch or the flood lamp switches. This condition will disable the joystick steering function and the machine flood lamps.When the left armrest is in the UP position, the ECM will disable the Implement Lockout Solenoid, the Medium Pressure Port A and Port B solenoids, the HCR/Offset Boom solenoids and the boom float solenoids.The ECM will not de-energize the Implement Lockout Relay when the armrest is in the UP position. This situation enables the joystick steering and the machine flood lamps to be active.If the position switch for the left armrest is faulted or if communication between the SSP and the ECM are disrupted, the ECM will de-energize the Implement Lockout Solenoid and the Implement Lockout Relay and the Implement Lockout Function will be ON.