PMG3516 Power Module Caterpillar

Intended Use

This Power Generator is used to generate electrical power.

Engine Description

Illustration 1	g01020798
G3516C Engine design (A) Inlet valves (B) Exhaust valves (C) Flywheel

Fuel System (Air/Fuel Ratio Control)

The fuel system includes these components:

• Fuel metering valve

• Engine control module (ECM)

• Inlet Manifold Pressure Sensor

• Load Signal

• Inlet manifold temperature sensor

The fuel metering valve controls the flow of fuel to the engine. The ECM determines the requirement for the mixture of air and fuel. The ECM sends a signal to the fuel metering valve. The fuel metering valve controls the volume of the gas flow to the engine.

The fuel flows through the fuel metering valve into the air inlet elbow. The mixture of air and fuel flows through the turbocharger compressor. The air/fuel mixture is cooled in the aftercooler. The mixture enters the manifold through a throttle which is electronically controlled.

The ECM sends an electronic throttle signal to the electronic actuator. The throttle is controlled by the actuator.

Ignition System

The engine is equipped with an electronic ignition system. The system provides dependable firing and low maintenance. The system provides precise control of the spark and the ignition timing for each cylinder.

The system also provides diagnostic capability that enhances troubleshooting.

The engines are equipped with protection from detonation. A detonation sensor is located between every two cylinders. The retarding of the ignition timing will take place when excessive detonation is sensed in that cylinder. If the maximum retarding position is attained and detonation continues to occur, the ECM shuts down the engine.

The engines are equipped with flame arresters. The flame arresters are located at the entrance of each inlet port. If the engine backfires, the flame arresters prevent the fire from entering the air/fuel mixture.

Lubrication System

The engine lubrication oil is circulated by a gear-driven pump. The oil is cooled and filtered. A bypass valve provides unrestricted flow of lubrication oil to the engine parts if the oil filter elements become plugged.

Cooling System

The cooling system uses a water pump. The cooling system has temperature regulators that regulate the temperature of the coolant. The temperature depends on the application.

The turbocharged engine has a Separate Circuit Aftercooler (SCAC). The temperature depends on the engine rating and the application.

The circuit for the aftercooler may be combined or the circuit for the aftercooler may be separate circuits. In the combined system, a pump circulates water through both the aftercooler and oil cooler cores. The combined system uses a thermostatic control to regulate the oil temperature. The thermostatic control prevents overcooling.

For a more detailed description, refer to the Systems Operation/Testing and Adjusting manual.

Description of the Generator

The SR4B brushless generator can be used with the following loads: mixed loads of motors and lights, SCR-controlled equipment, computer centers and petroleum drilling applications.

The generator set packages can be utilized for prime power generation or standby power generation.

SR4B generators are utilized in three-phase full-wave excitation and regulation. The generators are either four or six pole designs. The generators have six lead or 12 lead configurations. The generators are produce electrical power in either 50 Hz or 60 Hz applications.

Island Mode and Coal Mine Methane (CMM) application

Island Mode refers to an application for Generator Sets that is not paralleled to a public utility. In this operational state, the gas engine must maintain torque and crankshaft speed during steady state operations.

The Coal Mine Methane (CMM) application is a generator package that uses methane gas that is embedded in coal mines. The methane gas is used as fuel for the Generator Sets.

Power Module Enclosure

Basic Container

The enclosure for the power module is a shipping container that is mounted to an undercarriage chassis. The container meets the following standards and regulations:

• ISO/TC 104 Requirements for cargo containers

• ANSI/ MH5.1 Basic requirements for cargo containers

• ANSI/MH5.1.1 Requirements for closed van containers

• UIC Code 592-1 International union of railway

The container is also certified and complies with International Convention for Safe Containers (CSC) nine-stack high.

Dimensions

Illustration 2	g02909796
(A) 12.2 m (40 ft) (B) 2.6 m (8.5 ft) (C) 2.4 m (8 ft)

Access Door for the Load Cable

Show/hide table

Crushing hazard! Read and understand the instructions and warnings in the Operation and Maintenance manual. Failure to follow the instructions or heed the warnings could cause serious injury or death.

The access door for the load cables may provide a crush hazard if the door is not secured in a proper fashion. To secure the door, open the door and push up on the center of the linkage.

Illustration 3	g00922582
Securing the access door for the load cables

Illustration 4	g00773429
Access door for the load cable

Illustration 5	g00773448
Bus bar with connected load leads

The access door for the load cable is located outside of the power module. This access door is for access to the bus bars in order to connect the load leads.

Fire Extinguishers

Illustration 6	g00773468
Fire extinguisher

Fire extinguishers are standard equipment.

Louvers

Illustration 7	g00773474
Louver

Louvers are installed in the power module in order to receive fresh air. The louvers are sized in order to meet the inlet air supply that is required for the power module. The louvers allow fresh air to enter the power module that is needed for the engine air inlet and for radiator cooling during full load.

There are louvers that can be opened and closed manually. There are also louvers that can be opened or closed automatically. The louvers that are operated manually require the operator to open the louvers before and close the louvers after the operation of the power module.