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| Illustration 1 | g01597055 |
Left Side of Machine (1) Generator | |
Generator (1) is located on the left side of the machine. The left access door provides access to the generator.
Generator (1) produces electrical power for lighting, tools, and screed heating during machine operation. The generator may be driven by a hydraulic motor or the generator may be belt driven by the engine.
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| Illustration 2 | g01597073 |
Rear of Generator (2) Circuit breaker (3) Circuit breaker (4) Circuit breaker (5) Circuit breaker (6) Main circuit breaker | |
The circuit breaker panel for the generator is located on the rear of the generator set under a hinged access panel. The panel contains the following circuit breakers:
- Circuit breaker (2) for the left screed extender and extensions heating element
- Circuit breaker (3) for left main screed heating element
- Circuit breaker (4) for right main screed heating element
- Circuit breaker (5) for right screed extender and extensions heating element
- Main circuit breaker (6) for auxiliary power panel
Circuit breaker (6) protects the auxiliary power panel. The following circuit breakers supply power to the screed heating elements: Circuit breaker (2), circuit breaker (3), circuit breaker (4) and circuit breaker (5). All of the circuit breakers are GFCI protected.
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| Illustration 3 | g01597114 |
Front of Generator (7) Hydraulic generator relay | |
Hydraulic generator relay (7) is located on the left side of the machine in front of the generator. The coil of the relay receives power from the auxiliary circuit breaker. Terminal "J2-9" of the machine ECM provides a ground signal to the relay coil when the generator control switch is in the ON position.
When the coil of hydraulic generator relay (7) is energized, power is transferred from the auxiliary circuit breaker to the generator hydraulic solenoid. When the hydraulic solenoid is energized, hydraulic oil is directed from the generator pump to the generator motor.
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| Illustration 4 | g01597116 |
Rear of Generator | |
Generator relay (8) for the belt driven generator is located on the rear side of the generator. The rear panel provides access to this component.
The coil of generator relay (8) receives power from the auxiliary circuit breaker. Terminal "J2-9" of the machine ECM provides a ground signal to the relay coil when the generator control switch is in the ON position. When the coil is energized, the generator relay closes. This action connects terminal "E+" on the generator terminal board to terminal "E+" on the generator circuit board. When the relay is energized, excitation current is provided to the generator armature, and the generator provides voltage to the generator panel and to the electric screed heaters.
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| Illustration 5 | g01597118 |
Compartment at Front of Operator Station (9) Machine ECM (10) Connector "J2" (11) Connector"J1" | |
Machine ECM (9) is mounted to the door of the compartment at the front of the operator station. The compartment door provides access to this component.
Machine ECM (9) controls the generator system. This ECM has two 70-pin connectors, connector "J1" (11) and connector "J2" (10). The machine ECM receive input signals from components that are on the machine that monitor the most current conditions of the machine. The system software compares the gathered input to information that is stored in the memory of the ECM. The software evaluates the current conditions and the software generates output signals in order to control the generator system within set parameters.
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| Illustration 6 | g01597121 |
Connector "J1" for the Machine ECM | |
When the electrical disconnect switch is in the ON position, power transfers from the circuit breaker for the machine ECM to the following terminals of machine ECM (9) : terminal "J1-31", terminal "J1-39" and terminal "J1-47". This voltage input provides the power for the processor. When the main power relay is energized, power transfers from the circuit breaker for limp home mode to terminal "J1-1" of the machine ECM. This voltage input provides the wakeup signal to the machine ECM. The machine ECM is grounded at the following terminals: terminal "J1-13", terminal "J1-23" and terminal "J1-57".
Machine ECM (9) communicates with the operator control unit and the engine ECM through the Cat Data Link and the controller area network (CAN). The Cat Data Link is a proprietary standard of communication that was developed by Caterpillar. The Cat Data Link requires a positive line and a negative line. The positive line is connected to terminal "J1-10" of the machine ECM. The negative line is connected to terminal "J1-20" of the machine ECM.
The CAN lines provide high speed communication between the following components: machine ECM (9), operator control unit and engine ECM. The CAN requires a positive line and a negative line. The machine ECM contains two positive CAN lines and two negative CAN lines. The positive lines are connected to terminal "J2-56" and to terminal "J2-67" of the machine ECM. The negative lines are connected to terminal "J2-68" and to terminal "J2-70" of the machine ECM.
The tool enable switch is connected to terminal "J1-63" of machine ECM (9). When the machine ECM detects a ground signal on terminal "J1-63", the machine ECM determines that the tool enable switch is in the ON position.
When the tool enable switch is in the ON position, the machine ECM sends an engine speed request to the engine ECM through the CAT Data Link. This signal causes the engine ECM to operate the engine at the elevated idle speed of 1100 ± 50 rpm. The machine ECM prevents the operator from increasing or decreasing the engine speed while the tool enable switch is in the ON position.
Machine ECM (9) analyzes input signals and the machine ECM determines if a ground signal should be sent to hydraulic generator relay (7). If your machine has a belt driven generator, the ground signal will be sent to generator relay (8). The machine ECM provides a ground path for the hydraulic generator relay or for the generator relay at terminal "J2-9".
When the generator control switch is in the ON position, the machine ECM sends an engine speed signal to the engine ECM through the Cat Data Link. This signal prompts the engine ECM to prevent the engine speed from decreasing below the elevated idle speed.
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| Illustration 7 | g01597142 |
Operator Station (14) Connector "J1" (15) Operator control unit (16) Connector "J2" | |
Operator control unit (15) is mounted to the door of the compartment at the top of the operator station. This control unit has two 70-pin connectors. Connector "J1" (14) is the connector that is farther from the hinge of the compartment door. Connector "J2" (16) is the connector that is closest to the hinge of the compartment door.
Operator control unit (15) monitors input devices which are located in the operator station. The control unit communicates with machine ECM (9) through the Cat Data Link and the CAN lines.
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| Illustration 8 | g01597147 |
Connectors for the Operator Control Unit | |
When the electrical disconnect switch is in the ON position, power transfers from the circuit breaker for the operator ECM to the following terminals of operator control unit (15) : terminal "J1-31", terminal "J1-39" and terminal "J1-47". This voltage input provides the power for the processor. When the engine start switch is in the ON position, power transfers from contact "R" of the switch to terminal "J1-1" of the operator control unit. This voltage input provides the wakeup signal to the operator control unit. The operator control unit is grounded at the following terminals: terminal "J1-13", terminal "J1-23" and terminal "J1-57".
Operator control unit (15) monitors the condition of the circuit at terminal "J2-29" in order to determine the position of the generator control switch. Terminal "J2-22" provides a return path for the generator control switch. When the circuit at terminal "J2-29" is grounded, the control unit determines that the generator control switch is in the ON position. This signal is transferred to machine ECM (9) through the Cat Data Link.
The CAN lines provide high speed communication between machine ECM (9), the operator control unit, and the engine ECM. The CAN requires a positive line and a negative line. The operator control unit contains two positive CAN lines and two negative CAN lines. The positive lines are connected to terminal "J2-56" and to terminal "J2-67" of the operator control unit. The negative lines are connected to terminal "J2-68" and to terminal "J2-70" of the operator control unit.
Operator control unit (15) communicates with the other control units on the machine and with electronic service tools through the Cat Data Link. The Cat Data Link is a proprietary standard of communication that was developed by Caterpillar. The Cat Data Link requires a positive line and a negative line. The positive line is connected to terminal "J1-10" of the operator control unit. The negative line is connected to terminal "J1-20" of the operator control unit.
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| Illustration 9 | g01597153 |
Compartment at Front of Operator Station (17) Auxiliary circuit breaker (18) Circuit breaker for the machine ECM (19) Circuit breaker for the operator ECM | |
A circuit breaker panel is mounted to the door of the compartment at the front of the operator station. The compartment door provides access to these components. The circuit breaker panel contains the following circuit breakers, which are part of the generator system:
- Auxiliary circuit breaker (17)
- Circuit breaker (18) for the machine ECM
- Circuit breaker (19) for the operator ECM
When the electrical disconnect switch is in the ON position, power from the main circuit breaker is available at circuit breaker (19) for the operator ECM and at circuit breaker (18) for the machine ECM. When the main power relay is energized, power from the main circuit breaker is available at auxiliary circuit breaker (17) .
Auxiliary circuit breaker (17) is a manual reset breaker. This circuit breaker is rated at 15 amp. Power transfers from this circuit breaker to the coil of hydraulic generator relay (7) (hydraulic generators) or power transfers from this circuit breaker to the coil of generator relay (8) for belt driven generators. On machines that are equipped with the hydraulic generator, power is also transfered from this circuit breaker to contact "87" of the hydraulic generator relay.
Circuit breaker (18) for the machine ECM is a manual reset breaker. This circuit breaker is rated at 20 amp. Power transfers from this circuit breaker to the following terminals of the machine ECM: terminal "J1-31", terminal "J1-39" and terminal "J1-47".
Circuit breaker (19) for the operator ECM is a manual reset breaker. This circuit breaker is rated at 15 amp. Power transfers from this circuit breaker to the following terminals of the operator control unit: terminal "J1-31", terminal "J1-39" and terminal "J1-47".