| |
| Illustration 1 | g06131395 |
|
Vibratory Electrical System (1) Keypad (2) B+ from control power fuse (3) B+ from machine fuse (4) B+ from engine ECM fuse (5) B+ from switched relay (6) Propulsion lever (7) CAN-resistor "2" (8) CAN-resistor "1" (9) Machine ECM (10) Solenoid "B" (11) Solenoid "A" (12) Display (13) Engine ECM | |
When the electrical disconnect switch is in the ON position, power transfers from engine ECM fuse (4) to the following terminals of engine ECM (13):"84","85", and"86". This voltage provides the main power source for the engine ECM. The engine ECM is grounded at the following terminals:"81","82", and"83".
When the engine start switch is in the ON position, power transfers from machine fuse (3) to terminal"J1-69" of engine ECM (13). This voltage provides the wake-up signal to the engine ECM.
When the engine start switch is in the ON position, power transfers from switched relay"R3" (5) to the following terminals of machine ECM (9):"2","47","48","49", and"50". This voltage provides the main power source for the machine ECM. The machine ECM is grounded at terminal"1".
When the engine start switch is in the ON position and the shutdown relay is energized, power transfers from the control power fuse to the following locations:
- Contact"1" and contact"5" of keypad (1)
- Contact"2" of propulsion lever (6)
- Contact"2" of display (12)
Keypad (1), propulsion lever (6), display (12), engine ECM (13), and machine ECM (9) communicate through a CAN.
To prevent data loss in the communication lines, termination resistors are required at the ends of the CAN bus. CAN-resistors (7) and (8) act as termination resistors. Termination resistors absorb unwanted noise in the communication system which can result in abnormal machine operation.
Differences in materials along the CAN bus can cause data pulses in the bus to reflect back through the bus. This reflection, also known as"jitter", creates unwanted noise in the CAN bus. Jitter in the communication lines between computers can distort the original data signals. The distortion can result in data loss.
Data in the CAN bus can also be contaminated with radio frequency interference (RFI). This interference can be caused by several devices which operate on or near the machine. RFI creates noise in the communication lines which can also distort the original data signals and cause data loss.
Determination of Vibratory System Status
Machine ECM (9) examines input parameters to determine if the operating conditions for the vibratory system are met. Each of the following parameters must be met:
- The engine must be operating.
- The throttle status must be to high idle.
- The propulsion system must be enabled.
- The status of the vibratory control switch must be set to on.
Machine ECM (9) receives engine speed data from engine ECM (13) through the CAN. When the engine is operating, the vibratory system can be enabled.
Machine ECM (9) monitors input from the throttle switch on keypad (1) to set the desired throttle status. When the throttle status is set to low idle, the machine ECM will not enable the vibratory system. This statement is valid regardless of the status of the vibratory control switch. When the throttle status is set to ECO mode or to high idle, the vibratory system can be enabled.
If the propulsion system has been disabled for any reason, machine ECM (9) will disable the vibratory system. When the propulsion system is enabled, the vibratory system can be enabled.
Note: Refer to Electrical Schematic (Propulsion System) for additional information.
The vibratory system defaults to the disabled condition at engine start-up. In this case, the status of the vibratory control switch on propulsion lever (6) is set to off. After the engine has been started, machine ECM (9) monitors the state of the vibratory control switch through the CAN. Each time the operator actuates the vibratory control switch, the machine ECM changes the status of the switch. The first time the switch is actuated, the machine ECM changes the status of the vibratory switch from off to on. Subsequent actuations of this switch cycle the switch status between on and off, and the vibratory system status between enabled and disabled.
Vibratory Control Output Signals
Machine ECM (9) uses solenoid"A" (11) and solenoid"B" (10) to control the vibratory system. The output signals sent to these solenoids are digital.