PANEL GP-RELAY 1G7455 - Caterpillar

Figure 1.5 - PWM Input RequirementsLoad Factor Calculation
Engine Speed Limits
Figure 1.6 - Speed Limit Graph* Programmable Low and High Speed Limits* Isochronous Engine Governing at Part LoadHigh Idle Limit
Figure 1.7 - High Idle Limit Graph* TEL programmable from 1600-2310 rpm* Droop Programmable Using High Idle (TEL to 2310 rpm)* Droop Active at TEL Only* Isochronous Governing at Part SpeedFuel Temperature Power Compensation
Figure 1.8 - Fuel Temperature Power Graph* Provides Power at all fuel temperaturesFuel Temperature Sensor
Fuel temperature is monitored to adjust fuel rate calculations, and for fuel temperature power correction when fuel temperatures exceed 30 °C (86 °F) to provide consistent power. Maximum power correction is achieved at 70 °C (158 °F). Fuel Temperatures exceeding 80 °C (176 °F) for 30 seconds cause a diagnostic code to be logged.Auxiliary Pressure Sensor
The Engine Monitoring System provides an additional pressure sensor input for protection of engine driven equipment. EMS will monitor this parameter and turn on the auxiliary pressure fault light if the monitored pressure exceeds the customer programmable setting.The Auxiliary Pressure Sensor is an analog sensor with an operating range of 0 to 2900 kPa (0 to 420 psi). Programming the set point to 0 will disable all diagnostics associated with the Auxiliary Pressure Sensor. Schematic Auxiliary Temperature Sensor
The Engine Monitoring System provides an additional temperature sensor input for protection of engine driven equipment. EMS will monitor this parameter and turn on the auxiliary temperature fault light if the monitored temperature exceeds the customer programmable setting.The Auxiliary Pressure Sensor is 455 Hz digital sensor with an operating range of 0 to 120 °C (32 to 248 °F). Programming the set point to 0 will disable all diagnostics associated with the Auxiliary Temperature Sensor. Schematic Block Diagram
Figure 1.9 - Block DiagramService Tools
The Caterpillar Electronic Service Tools for the electronic control system are designed to help the service technician analyze and locate faults or problems within the system. It is required to perform some sensor calibrations electronically, and to read or change engine parameters.The Electronic Control Analyzer Programmer (ECAP) tool has small plug-in modules, called Service Program Modules (SPM), to adapt the basic tool to the specific Caterpillar electronic control application.Caterpillar Electronic Technician (ET) requires a personal computer with the ET software installed and a Caterpillar Communication Adapter to translate from the data link to the computer RS-232 port.The ECAP or ET communicates with the Electronic Control Module to read diagnostic codes, to read the various sensor output signals such as engine speed, or boost pressure, and controls electronic calibration of the sensors through the ECM.The ECAP (requires PWM adapter to measure at the sensor) can measure Pulse Width Modulated (PWM) signals, such as the signal produced by the Throttle Position Sensor.There are several adapter cables, Breakout T cables, probes, etc, that are used with the Electronic Service Tools in order to access measurements of signals.The Breakout T harness is inserted in series between a harness jack and plug to permit voltage measurement on an operating system. The Bypass T harness