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| Illustration 1 | g06618647 |
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Propel Control System (1) Machine ECM (2) Engine ECM (3) Display (4) Propel lever (5) Keypad (6) 360 left seat switch (7) 360 right seat switch (8) E-STOP switch (9) Operator presence switch (10) Back-up alarm relay (11) 360 back-up alarm relay (12) Back-up alarm (13) 360 back-up alarm | |
The electrical schematics in this section will provide information about operator and functions of the electrical system. Propel system logic follows the schematics.
Note: The blue lines in the above illustration indicate an input signal. The red lines indicate an output signal. The green and yellow lines indicate CAN communication. The arrowheads on the end of the lines indicate the direction of communication.
Note: The above illustration shows the general layout of the propel control system. Refer to the machine electrical schematic for detailed wiring information.
Machine ECM (1) analyzes information from input devices to determine how to control machine propel. The following components provide direct input signals to the machine ECM:
- Parking brake switch in keypad (5)
- 360 Left seat switch (6)
- 360 Right seat switch (7)
- E-STOP switch (8)
- Operator presence switch (9)
Input signals are also sent through the CAN lines. The following input signals are sent to machine ECM (1) through the CAN:
- Engine speed from engine ECM (2)
- Desired engine speed from display (3)
- Position of propel lever (4)
- Speed scale factor and propel mode from keypad (5)
Machine ECM (1) generates output signals to control machine propel. The following components receive direct output signals from the machine ECM:
- E-STOP switch (8)
- 360 Back-up alarm relay (11)
Output signals are also sent through the CAN lines. The following output signals are sent from machine ECM (1) through the CAN:
- Parking brake and operator presence status on display (3)
- Speed scale factor stored value indicator to keypad (5)
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| Illustration 2 | g06618650 |
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Propel Control System (1) Machine ECM (2) Engine ECM (3) Display (4) Propel lever (5) Keypad (14) Shift solenoid (15) Parking brake solenoid (16) Propel pump forward solenoid (17) Propel pump reverse solenoid (18) Left speed sensor (19) Solid drum speed sensor (20) Right speed sensor (21) Solid drum speed sensor | |
Machine ECM (1) analyzes information from input devices to determine how to control machine propel. The following components provide direct input signals to the machine ECM:
- Parking brake switch in keypad (5)
- Left rear drum speed sensor (18)
- Right front drum speed sensor (20)
The following input signals are sent to machine ECM (1) through the CAN:
- Engine speed from engine ECM (1)
- Desired engine speed from display (3)
- Position of propel lever (4)
- Speed scale factor and propel mode from keypad (5)
Machine ECM (1) generates output signals to control machine propel. The following components receive direct output signals from the machine ECM:
- Shift solenoid (14)
- Parking brake solenoid (15)
- Propel forward solenoid (16)
- Propel reverse solenoid (17)
Note: The electrical schematic pin connections and connector of parking brake solenoid (15) are labeled "Parking Brake". On the hydraulic schematic, this same component is labeled as the"Interlock Solenoid". These solenoid labels "Parking Brake" and "Interlock Solenoid" are to be regarded as labels to the same, single component.
Machine ECM (1) evaluates input signals from the components in the propel system and transmits an output signal to parking brake solenoid (15). When this solenoid is energized, the park brake is released and the propel pump receives control pressure.
Machine ECM (1) evaluates input signals from the components in the propel system and transmits output signals to propel solenoids (16) and (17).
If the speed range is set to high or travel, machine ECM (1) energizes shift solenoid (14).
Output signals are also sent through the CAN lines. The following output signals are sent from machine ECM (1) through the CAN:
- Engine speed, actual ground speed, target ground speed to display (3)
- Parking brake and lever out of neutral indicator to keypad (5)
- Speed scale factor stored value indicator to keypad (5)
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| Illustration 3 | g06618661 |
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Enable (22) Shift solenoid logic | |
Each of the following conditions must be met for the propel enable logic:
- The engine must be running.
- The parking brake switch must be in the OFF position.
- The propel lever must be in the NEUTRAL position for 1 second before machine movement is enabled.
- There are no propel faults.
- The operator is in the seat.
The engine is considered "on" when the engine speed is greater than or equal to 600 rpm for more than 1 second. If the engine speed parameter is unavailable or faulted, the engine ECM holds the last known value for engine speed.
If the machine ECM determines that the parking brake is engaged, the ECM will prevent the propel system from operating. If the machine ECM determines that the parking brake is released, the ECM continues to analyze propel system parameters including fault monitoring and the operator presence.
The machine ECM controls the parking brake solenoid. When the machine ECM determines that the parking brake should be engaged, no signal is generated. When the machine ECM determines that the parking brake should be released, a signal energizes the parking brake solenoid.
When the parking brake solenoid is energized, the parking brakes are released and the propel pump controls are enabled. The interlock solenoid remains energized while the machine is moving. The parking brake solenoid will turn off when the propel lever is in the NEUTRAL position for greater than 1 second.
If the parking brake switch is in the ON position, the parking brake is engaged, regardless of the position of the propel lever.
If the above parameters are met, the machine ECM monitors input from operator controls. The Y-axis of the joystick provides input to the ECM through the CAN lines. The ECM uses this input to control propel direction.
The machine ECM will display a level-one fault in the propel system if any of the following faults or events are active:
- Propel forward solenoid out of calibration
- Propel reverse solenoid out of calibration
The machine ECM will disable the propel system if any of the following level-two faults or events are active:
- Propel mode shift solenoid fault
- Five-volt sensor supply fault
- Joystick fault
- Propel keypad fault
- Right front sensor #1
- Right front sensor #2
- Left rear sensor #1
- Left rear sensor #2
The machine ECM will disable the propel system when any of the following level-three faults or events are active:
- E-STOP fault
- Parking brake solenoid fault
- Propel forward control solenoid faults
- Propel reverse control solenoid faults
- Uncommanded machine movement detected (propel or steering)
- Operator seat switch faults or events
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| Illustration 4 | g06618664 |
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Input Components (23) Shift solenoid logic | |
During operation, the machine ECM analyzes input from the propel mode button to determine when the operator presses the button.
The ECM toggles the propel mode between LOW mode, HIGH mode, and TRAVEL mode with each actuation of the propel mode button. When the propel mode is set to HIGH or TRAVEL, the machine ECM sends a digital output signal from pin "J1-65" to the shift solenoid.
The machine ECM monitors input from the propel mode switch through the CAN. The ECM toggles between low and high with each actuation of the switch. The software in the machine ECM contains a speed map for each propel mode.
The machine ECM will disable the propel system if any of the following level-two faults or events are active:
- Propel mode shift solenoid fault
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| Illustration 5 | g06618667 |
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Input Components (24) Speed sensor speed logic | |
The machine ECM uses input from right-front (RF) and left-rear (LR) speed sensors in determining closed-loop pressure balance. The speed sensors are also used for calculation of actual speed of the machine.
The closed-loop pressure balance logic uses an algorithm to calculate actual speed of the machine. The propel speed dial and the joystick movement will convey the operators desired speed. When the machine is moving, the speed sensors will send a signal back to the machine ECM.
The machine ECM monitors input from the right front speed sensor and the left rear speed sensor. The machine ECM uses input from these speed sensors to determine the actual machine speed and direction.
The ECM averages the input from the two sensors to calculate the machine speed. The machine ECM compares the observed machine speed to the desired machine speed.
Each speed sensor provides two pulsed input signals. The machine ECM compares the frequency of the two signals from each speed sensor. If internal signals from either sensor are out of sync, the machine ECM generates a level-two fault. In this case, the ECM sets the propel mode to low, and the functioning sensor is used for speed input. If internal signals from both sensors are out of sync, the machine ECM generates a level-two fault. In this case, the ECM sets the propel mode to low, and the undetected movement detection logic is disabled. When this level-two fault is active, propel control is operated with open-loop logic, but machine performance may be degraded.
The machine ECM will disable the propel system if any of the following level-two faults or events are active:
- Right front sensor #1
- Right front sensor #2
- Left rear sensor #1
- Left rear sensor #2
Direction control and speed logic
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| Illustration 6 | g06618668 |
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Propel Direction Logic (25) Direction control and speed logic | |
The machine ECM monitors the direction input signals from the joystick. These signals are transmitted through CAN. This signal identifies the position of the joystick along the Y-axis. This signal determines the FORWARD, NEUTRAL, REVERSE position of the joystick.
When the propel lever is moved to the FORWARD position, the machine ECM sends a digital output signal from pin "J1-10" to the propel-forward solenoid. As the machine moves forward, the ECM calculates the speed increase based on signals from the speed sensors. The speed sensor information is used in both direction and actual speed calculation.
When the propel lever is moved to the REVERSE position, the machine ECM sends a digital output signal from pin "J1-57" to the propel-reverse solenoid. As the machine moves in rearward, the ECM calculates the speed increase based on signals from the speed sensors. The speed sensor information is used in both direction and actual speed calculation.
When the propel lever is moved to the NEUTRAL position, the machine ECM discontinues the signal to the propel solenoid, de-energizing the appropriate solenoid. The machine will come to a quick, ramped stop.
Note: Travel direction is determined with respect to the direction the operator station is facing. When the operator station is facing the rear of the machine, the value assigned to the position of the propel lever is the opposite of what is assigned when the operator station is facing the front of the machine.
The machine ECM will display a level-one fault in the propel system if any of the following faults or events are active:
- Propel forward solenoid out of calibration
- Propel reverse solenoid out of calibration
The machine ECM will disable the propel system if any of the following level-two faults or events are active:
- Propel mode shift solenoid fault
- Five-volt sensor supply fault
- Joystick fault
- Right front sensor #1
- Right front sensor #2
- Left rear sensor #1
- Left rear sensor #2
The machine ECM will disable the propel system when any of the following level-three faults or events are active:
- Propel forward control solenoid faults
- Propel reverse control solenoid faults
- Uncommanded machine movement detected (propel or steering)