This power module is intended for use in generating electrical power. The power module is a complete self-contained unit that can be towed to any location for the generation of electrical power. The power module can be utilized for prime power generation or standby power generation.
Cat C27 Engines provide the following features:
- Four-cycle
- Direct fuel injection
- Mechanical Electronic Unit Injector (MEUI)
- Turbocharged
- Air-To-Air Aftercooler (ATAAC)
Cat C27 Engines are designed with electronic controls. The integral on board computer controls the operation of the engine. Current operating conditions are monitored. The Electronic Control Module (ECM) controls the response of the engine to these conditions and to the demands of the operator. These conditions and operator demands determine the precise control of fuel injection by the ECM. The electronic engine control system provides the following features:
- Engine and auxiliary monitoring
- Engine speed governing
- Cold start strategy
- Automatic air/fuel ratio control
- Torque rise shaping
- Automatic altitude compensation
- Injection timing control
- System diagnostics
For more information on electronic engine features, refer to the Operation and Maintenance Manual, "Features and Controls" topic (Operation Section).
Engine Cooling and Lubrication
The cooling system consists of the following components:
- Gear-driven centrifugal water pump
- Water temperature regulators which regulate the engine coolant temperature
- Gear-driven oil pump (gear type)
- Oil cooler
The engine lubricating oil is also filtered. Bypass valves provide unrestricted flow of lubrication oil to the engine components during the following conditions:
- High oil viscosity
- Plugged oil cooler or plugged oil filter elements (paper cartridge)
Engine efficiency and maximum utilization of engine performance depend on the adherence to proper operation and maintenance recommendations. In addition, use recommended fuels, coolants, and lubricants. Use this Operation and Maintenance Manual as a guide for required engine maintenance.
Expected engine life is predicted by the average power that is demanded. The average power that is demanded is based on fuel consumption of the engine over a time period. For more information, refer to the Operation and Maintenance Manual, "Overhaul Considerations" topic (Maintenance Section).
Note: The front end of the engine is opposite the flywheel end of the engine. The left and the right sides of the engine are determined from the flywheel end. The number 1 cylinder is the most forward cylinder.
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| Illustration 1 | g00291566 |
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Cylinder and valve locations (A) Inlet valves (B) Exhaust valves | |
| C27 Generator Set Engine Specifications | |
| C27 | |
| Cylinders and Arrangement | 12 cylinder vee block |
| Bore | |
| Stroke | |
| Compression Ratio | 15:1 |
| Aspiration | TA(1) |
| Displacement | |
| Firing Order | 1-10-9-6-5-12-11-4-3-8-7-2 |
| Rotation (flywheel end) | Counterclockwise |
| (1) | Turbocharged Aftercooled |
The brushless generator can be used with the following loads: mixed loads of motors and lights, SCR-controlled equipment, computer centers, installations of communications and petroleum drilling applications.
The generator set packages can be utilized for prime power generation or standby power generation.
The generator is utilized in three-phase full-wave excitation and regulation. The generator is a four pole design with twelve-lead configuration. The generators can produce electrical power in either 50 Hz or 60 Hz applications.
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
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| Illustration 2 | g01297394 |
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Vertical discharge panel | |
The vertical discharge panel is installed in power modules that are equipped with vertical radiators. The panel directs hot air from the radiator and engine exhaust through an opening in the roof. The panel directs the hot air away from the surrounding area of the power module.
Fire extinguishers and fire suppression systems are available as an option.
Fuel Storage and Fuel Delivery
A
A fuel transfer system is standard for the power module. During the operation of the power module, the fuel transfer system will automatically fill the fuel tank from a fuel reservoir. The pump for the fuel transfer system is driven by an electric motor. Strainers are on the suction and the discharge in order to protect the fuel transfer pump from debris. The fuel transfer system is equipped with safety features to prevent the fuel tank from being overfilled.
Power modules that are equipped with the Onboard Import/Export Fuel Transfer system require the plumbing for the external fuel supply to be properly plumbed. A positive head is required to push the fuel through the suction piping into the fuel transfer pump.
The fuel transfer pump requires a specific minimum Net Positive Suction Head Available (NPSHA) to operate properly. The NPSHA can be estimated by adding the static suction head and the dynamic restrictions that are in the external piping.
The static suction head is the pressure difference between the fuel connection of the power module and the fuel level in the fuel supply tank. The static suction head pressure is considered negative if the fuel connection of the power module is above the fuel level in the supply tank. The static suction head pressure is considered positive if the fuel connection of the power module is below the fuel level in the supply tank.
If the static suction head pressure is negative, determine the NPSHA by subtracting the negative static suction head pressure value from
Note: A chart that shows the relative resistance of valves and pipe fittings to the flow of fluids is provided in Caterpillar Electric Power Application and Installation Guide, LEBX0030, "Fuel Systems". All piping should be a minimum of 1.5 inches in diameter. This size of piping will optimize the velocity friction losses for the system.