ROLLER GP-TRACK CARRIER 2355974 - Caterpillar

Throttle Position Sensor
The Throttle Position Sensor (TPS) eliminates the mechanical throttle and governor linkages. The TPS utilizes the lever movement by the operator to send an electrical signal to the ECM for the engine. The TPS signal and the speed/timing signal are processed by the ECM to control engine speed. The output of the sensor is a constant frequency signal with a pulse width that varies with the throttle position. The pulse width measures the duty cycle. The Pulse Width Modulated (PWM) signal is expressed as a percentage of the duty cycle.Figure 20 - Duty Cycle Figure 21 - PWM Definition Figure 22 - Throttle Position Percent versus PWM Input PWM Input Requirements
The following criteria are required for the correct operation of the throttle position sensor:* Active pull up/ pull down with output protection* Sensor stop -Low Stop 7.5 2.5%High Stop 92.5 2.5%.* Output frequency-Minimum of 300 HzNominal of 500 HzMaximum of 700 Hz* High output voltage -Minimum of 4.5 VDCMaximum of 32.0 VDC.* Low output voltageMinimum of -0.3 VDCMaximum of 0.5 VDC* Sink current1.5 mA* Source current2.0 mA* Output linearity 2.5% duty cycle vs. throttle lever position.Figure 23 - ECM Test Circuit Engine Synchronization Switch
The purpose of the engine synchronization switch is to link multiple engine ECM's to a single throttle on the vessel. The single throttle controls the engine speed for all the engines. This feature improves the control of the vessel and adds operator convenience.A single throttle control for vessels that have multiple engines is standard practice which allows the transfer of throttle control to any other throttle.Table 10: "Code for Synchronization of Throttle Controls" gives the code that determines the synchronization of throttle controls. The synchronization function can only be activated or deactivated when the desired engine speed of all engines are within 50 rpm of each other.Table 10: Code for Synchronization of Throttle Controls Multiple Synchronization Switch Installations
These engines support single station throttle synchronization. The synchronization is accomplished by the use of two switch inputs on each ECM to determine the throttle synchronization. The engine ECM is not designed to support synchronization switches from multiple stations.Multiple stations complicate the wiring and typically require some method of transferring control from one station to another station. The transfer of control may be accomplished by several methods. The boat builder or installer is responsible for determining the method and ensuring proper operation of synchronization.If multi-station synchronization switches are installed, care MUST be taken to prevent both of the synchronization inputs (Connector J3 pin 34 and pin 35) from being connected to the Negative Battery Bus Bar. If both synchronization inputs are low, the ECM will only monitor the primary throttle and the synchronization inputs will be ignored. Care MUST also be taken to ensure that positive battery to negative battery SHORT CIRCUIT does not occur in the wiring for the synchronization switches.Throttle Control for Single Engine Installation
Figure 24 - Throttle Position Sensor Connections for a Single Engine Installation Table 11: Throttle Switch Positions Table