Machine Material Feed System
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| Illustration 1 | g01586194 |
Circuit for the material feed system (1) Right auger forward solenoid (EDC valve) (2) Left auger forward solenoid (EDC valve) (3) Right auger reverse solenoid (EDC valve) (4) Left auger reverse solenoid (EDC valve) (5) "B+" from main circuit breaker (6) Circuit breaker for the operator ECM (7) Circuit breaker for the machine ECM (8) Circuit breaker for the screed ECM (9) Circuit breaker for the sensor (10) Circuit breaker for the screed (11) Circuit breaker for grade and slope (12) Circuit breaker for limp home mode (13) "B+" from main relay (14) Machine ECM (15) Right conveyor forward solenoid (EDC valve) (16) Left conveyor sonic sensor (17) Right conveyor speed dial (18) Left conveyor reverse solenoid (EDC valve) (19) Right conveyor reverse solenoid (EDC valve) (20) Left conveyor speed dial (21) Diode block (22) Right conveyor sonic sensor (23) Left conveyor forward solenoid (EDC valve) (24) Left conveyor mode switch (25) Left auger mode switch (26) Right conveyor mode switch (27) Right auger mode switch (28) Conveyor reverse switch (29) Auger reverse switch (30) Switch for speed connector (31) Operator control unit | |
When the electrical disconnect switch is in the ON position, power transfers from the main circuit breaker to the following locations:
- Operator ECM circuit breaker
- Circuit breaker for the machine ECM
- Circuit breaker for the screed ECM
The machine ECM receives power from the circuit breaker for the machine ECM at the following terminals: terminal "J1-31", terminal "J1-39" and terminal "J1-47". The machine ECM is grounded at the following terminals: terminal "J1-13", terminal "J1-23" and terminal "J1-57".
The operator control unit receives power from the circuit breaker for the operator ECMat the following terminals: terminal "J1-31", terminal "J1-39" and terminal "J1-47". The operator control unit is grounded at the following terminals: terminal "J1-13", terminal "J1-23" and terminal "J1-57".
The screed ECM receives power from the circuit breaker for the screed ECM at terminal "J1-31" and "J1-39". The screed ECM is grounded at terminal "J1-13".
When the main power relay is energized, power is available at the following locations:
- Circuit breaker for the sensor
- Circuit breaker for the screed
- Circuit breaker for limp home mode
- Circuit breaker for grade and slope
The circuit breaker for the screed provides power to components on the screed. The circuit breaker for the sensor provides power to the right conveyor sonic sensor and the left conveyor sonic sensor. The circuit breaker for limp home mode provides the wakeup signal to the machine ECM. The circuit breaker for grade and slope provides power to the sonic sensors for material height on the screed.
The operator control unit monitors the circuits at the following terminals in order to determine the positions of the control switches for material feed:
- Terminal "J1-35" for the auger reverse switch (LEFT)
- Terminal "J2-37" for the auger reverse switch (RIGHT)
- Terminal "J1-41" for the left auger mode switch (MANUAL)
- Terminal "J1-40" for the left auger mode switch (AUTOMATIC)
- Terminal "J2-39" for the right auger mode switch (MANUAL)
- Terminal "J2-38" for the right auger mode switch (AUTOMATIC)
- Terminal "J2-45" for the right conveyor mode switch (MANUAL)
- Terminal "J2-44" for the right conveyor mode switch (AUTOMATIC)
- Terminal "J1-43" for the left conveyor mode switch (MANUAL)
- Terminal "J1-42" for the left conveyor mode switch (AUTOMATIC)
- Terminal "J2-36" for the conveyor reverse switch
When all of the material feed switches are in the HOLD position, the operator control unit reads an open circuit at each of the above terminals. Under these conditions, the machine electronic control system does not generate a signal to any output component in the material feed system.
When the left auger mode switch is in the MANUAL position, the circuit at terminal "J1-41" of the operator control unit is complete. The operator control unit transmits this information to the machine ECM through the Cat Data Link. The machine ECM sends a maximum signal from terminal "J1-58" to the left auger forward solenoid (EDC valve). Maximum pump supply flow is available to the left auger motor.
When the left conveyor mode switch is in the MANUAL position, the circuit at terminal "J1-43" of the operator control unit is complete. The operator control unit transmits this information to the machine ECM through the Cat Data Link. The machine ECM sends a maximum signal from terminal "J1-67" to the left conveyor forward solenoid (EDC valve). Under these conditions, maximum pump supply flow is available at the left conveyor motor.
The right auger mode switches and the right conveyor mode switches operate following the same logic as the left switches. When the right auger mode switch is in the MANUAL position, the circuit at terminal "J2-39" is complete. The operator control unit transmits this information to the machine ECM through the Cat Data Link. The machine ECM directs a maximum signal from terminal "J1-61" to the right auger forward solenoid (EDC valve).
When the right conveyor mode switch is in the MANUAL position, the circuit at terminal "J2-45" is complete. The operator control unit transmits this information to the machine ECM through the Cat Data Link. The machine ECM prompts the operator control unit to send a maximum signal from terminal "J1-65" to the right conveyor forward solenoid (EDC valve).
The operator control unit monitors the circuit at terminal "J1-35" and at terminal "J2-37" in order to determine the position of the auger reverse switch. When the auger reverse switch is in the HOLD position, the circuits at these terminals are open. In this case, the machine ECM is not prompted to generate an output signal from the control terminals to the auger reverse solenoid.
When the auger reverse switch is in the RIGHT position, the circuit at terminal "J2-37" of the operator control unit is complete. This situation prompts the machine ECM to generate an output signal from terminal "J1-62". This output signal energizes the right auger reverse solenoid (EDC valve). When the auger reverse switch is in the LEFT position, the circuit at terminal "J1-35" is complete. When the circuit at "J1-35" is complete, the machine ECM generates an output signal from terminal "J1-59".
When the auger mode switches and the conveyor mode switches are in the AUTOMATIC position, the machine ECM monitors input signals from the following components:
- The left and right conveyor speed dials
- The left and right conveyor sonic sensors (if equipped)
The operator control unit sends output signals to the four conveyor control solenoids.
If conveyor sonic sensors are installed and the conveyors are operating in automatic mode, conveyor speed is determined by the position of the conveyor speed dials and the material height at the end of the conveyors.
Screed Material Feed System
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| Illustration 2 | g01586195 |
Material feed switches (HOLD) (1) Left screed operator station (2) Left conveyor master switch (3) Left indicator (conveyor stop) (4) Left material height dial (5) Left auger master switch (6) Connector for the screed (7) Screed ECM (8) Left conveyor stop switch (9) Left material feed sensor (10) Right conveyor master switch (11) Right screed operator station (12) Right conveyor master switch (13) Right indicator (conveyor stop) (14) Right material height dial (15) Right auger master switch (16) Right material feed sensor | |
When all of the material feed switches are in the HOLD position, the screed ECM reads an open circuit at the following terminals:
- Terminal "J1-27" for the left conveyor master switch (MANUAL)
- Terminal "J1-28" for the left conveyor master switch (REVERSE)
- Terminal "J1-32" for the left auger master switch (MANUAL)
- Terminal "J1-33" for the left auger master switch (REVERSE)
- Terminal "J2-34" for the right conveyor master switch (MANUAL)
- Terminal "J2-35" for the right conveyor master switch (REVERSE)
- Terminal "J2-40" for the right auger master switch (MANUAL)
- Terminal "J2-41" for the right auger master switch (REVERSE)
Note: Under the above conditions, the machine ECM is not prompted to generate a signal to any output component in the material feed system. This is not the case if the machine is in the PAVE mode and the auger and conveyor switches are in the AUTOMATIC position.
When the left conveyor stop switch on the screed is in the NORMAL position, terminal "J1-34" and terminal "J1-35" of the screed ECM are floating. When the left conveyor stop switch is in the LEFT position, terminal "J1-34" is grounded and terminal "J1-35" is floating. When the left conveyor stop switch is in the BOTH position, terminal "J1-34" is floating and terminal "J1-35" is grounded. The conveyor stop switch is used to determine if the left or right conveyors should be moving. The LEFT position stops the left conveyor. The BOTH position stops both conveyors. The NORMAL position allows both conveyors to move. The conveyor stop switch returns to the NORMAL position by use of a spring. If the switch is moved into the BOTH position, the machine electronic control system will not allow the conveyors to move until the switch is cycled through the BOTH position again.
The right conveyor stop switch on the screed operates following the same logic as the left conveyor stop switch. When the right conveyor stop switch is in the NORMAL position, terminal "J1-40" and terminal "J1-41" of the screed ECM are floating. When the right conveyor stop switch is in the RIGHT position, terminal "J1-40" is grounded and terminal "J1-41" is floating. When the right conveyor stop switch is in the BOTH position, terminal "J1-40" is floating and terminal "J1-41" is grounded. The conveyor stop switch is used to determine if the left or right conveyors should be moving. The RIGHT position stops the right conveyor. The BOTH position stops both conveyors. The NORMAL position allows both conveyors to move. The conveyor stop switch returns to the NORMAL position by use of a spring. If the switch is moved to the BOTH position, the machine electronic control system will not allow the conveyors to move until the switch is cycled through the BOTH position again.
The left conveyor stop indicator and right conveyor stop indicator indicate when both conveyors have been stopped by one of the conveyor stop switches. When the lamp is inactive, movement of the conveyor is allowed.
When the left conveyor master switch on the screed is in the MANUAL position, the circuit at terminal "J1-27" of the screed ECM is complete. A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-67" to the left conveyor forward solenoid (EDC valve).
When the left conveyor master switch on the screed is in the REVERSE position, the circuit at terminal "J1-28" of the screed ECM is complete. A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-68" to the left conveyor reverse solenoid (EDC valve).
The right conveyor master switch on the screed operates following the same logic as the left conveyor master switch. When the right conveyor master switch is in the MANUAL position, the screed ECM reads a complete circuit at terminal "J2-34". A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-65" to the right conveyor forward solenoid (EDC valve).
When the right conveyor master switch is in the REVERSE position, the screed ECM reads a complete circuit at terminal "J2-35". A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-66" to the right conveyor reverse solenoid (EDC valve).
When the left auger master switch on the screed is in the MANUAL position, the circuit at terminal "J1-32" of the screed ECM is complete. A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-58" to the left auger forward solenoid (EDC valve).
When the left auger master switch on the screed is in the REVERSE position, the circuit at terminal "J1-33" of the screed ECM is complete. A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-59" to the left auger reverse solenoid (EDC valve).
The right auger master switch on the screed operates following the same logic as the left auger master switch. When the right auger master switch is in the MANUAL position, the screed ECM reads a complete circuit at terminal "J2-40". A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-61" to the right auger forward solenoid (EDC valve).
When the right auger master switch is in the REVERSE position, the screed ECM reads a complete circuit at terminal "J2-41". A signal is then broadcast across the Cat Data Link to the machine electronic control system. The machine ECM directs a maximum signal from terminal "J1-62" to the right auger reverse solenoid (EDC valve).
When paving parameters are met, the machine ECM determines the desired material height by monitoring the input signals from the material height dials which are on the screed operator stations. The desired material height is referred to as the set point.
The screed ECM determines the set point for the left side of the machine by monitoring the input signal which is sent to terminal "J1-22" from the left material height dial.
Terminal "J2-24" of the machine ECM receives an input signal from the left material height sensor. The machine ECM compares this input signal to the input signal that is at screed ECM terminal "J1-22". The machine ECM performs this comparison in order to determine if the actual material height matches the set point. If the actual material height is greater than the set point, the machine ECM does not direct an output signal to the left auger forward solenoid (EDC valve). In this situation, the left auger motor does not operate.
If the actual material height is less than the set point from the sonic sensor for the material height, the machine ECM directs an output signal from terminal "J1-58" to the left auger forward solenoid (EDC valve). The magnitude of the signal is proportional to the difference between the actual material height and the set point. The output signal increases when the difference between the actual material and the set point increases. When the output signal increases the auger motor speed increases.
Once the magnitude of the signal to the left auger forward solenoid (EDC valve) has been established, the machine electronic control system uses the input signal from the left conveyor speed dial in order to determine the desired speed of the left conveyor motor. The left conveyor speed dial sends a signal to terminal "J1-22" of the operator control unit. The duty cycle of the signal depends on the position of the left conveyor speed dial. The minimum setting on the dial is the lowest duty cycle.
The input signal at terminal "J1-22" is used in order to determine the magnitude of the output signal which should be sent from terminal "J1-51" to the left conveyor forward solenoid (EDC valve). Output signal from terminal "J1-51" is controlled by input signal at terminal "J1-22". The speed of the left conveyor motor decreases when the output signal decreases. Output signal from The position of the left conveyor speed dial is inversely proportional to the amount of oil flow which drives the left conveyor motor.
For machines that are equipped with conveyor sonic sensors, conveyor speed is determined by the position of the conveyor speed dial and the input signal from the conveyor sonic sensors. In this case, the functionality of the conveyor is independent from the functionality of the auger.
For machines without conveyor sonic sensors, the speed of the conveyor is determined by the position of the conveyor speed dial. Also, the speed of the conveyor is determined by the signal that is being sent to the auger forward solenoid (EDC valve).
Note: The machine ECM applies the same logic to the left and right sides of the machine during automatic operation. The right and left sides of the machine are independently controlled.