When selecting a diesel generator set, it's crucial to consider its comprehensive performance and economic indicators, the location of the generator manufacturer or dealer, their actual professional level, and their after-sales service capabilities. Next, assess whether the power output of the generator set matches the electrical load power. The standard configuration of Cummins diesel generator sets includes not only the Cummins diesel engine and the Stamford generator as the main units but also the auxiliary components provided. You can learn about the basic details of the standard configuration by referring to the technical specifications in the Cummins power product manual, quotes, and information published on the Cummins website. If the standard configuration is missing, it can to some extent affect the usage and performance of the diesel generator set. This document specifically describes the types and primary functions of the optional and accessory items provided with the Cummins diesel generator sets.

1. Standard Optional Accessories for Chai Fa Regular Models

The diesel generator set is primarily composed of Cummins diesel engines, Stanford generators, and PC3.3 control systems as the three main components. Taking the Cummins generator set model C220D5 as an example, its structure and layout are shown in Figures 1 and 2. The standard configuration includes the following:

1. Features of Cummins Diesel Engines

(1) Cylinder Body

Enhanced rib layout and wide lower skirt design enhance the cylinder's rigidity and strength, reducing vibration and noise, thereby improving the engine's reliability.

② Large cylinder bore design, allowing for the arrangement of 4 larger valves, not only reduces intake resistance and enhances filling efficiency, improves fuel economy, but also extends valve life and enhances engine reliability.

③ Added special oil and water extraction holes, as well as mounting holes for STC and electronic fuel injection systems, which are beneficial for the future development and application of electronic fuel injection technology.

④ Increase the optional mounting bracket positions for the fan, improving bracket rigidity.

⑤ Utilizes a universal low-pressure cylinder sleeve with improved surface roughness.

(2) Cylinder Head

One pot, one cover, easy for maintenance.

② Features a four-valve (two intake, two exhaust) design, offering low intake resistance, significantly enhancing fuel injection efficiency, and promoting more complete combustion.

③ The exhaust outlet and exhaust duct have been improved to a transition structure, utilizing pulsating air ducts, which is conducive to the full utilization of exhaust energy.

④ High-strength cast iron material is used, further enhancing the cylinder head's impact resistance. Increased valve rigidity results in a stronger over-revving capability for the engine.

(3) Crankshaft

Forged from high-strength alloy steel material to enhance crankshaft strength and lifespan.

② Axle neck overlap effectively enhances the rigidity and strength of the crankshaft, improving reliability.

The original crankshaft structure was an insert-type balance weight design, while the new design employs an integrated crankshaft structure, significantly reducing the failure rate of the crankshaft and enhancing its reliability.

④ Induction hardening at corner increases the crankshaft strength, and the induction hardening at crankshaft journals up to 2.2mm in depth enhances the wear resistance of the crankshaft.

(4) Pistons and connecting rods

Pistons are made of suitable aluminum alloy material, offering low inertia during high-speed operation, good thermal conductivity, and sufficient strength to meet working requirements.

② The cylinder skirt design features a drum face, ensuring proper fit during operation with adequate bearing surface. The clearance is neither too small nor too large to cause knocking in the cylinder.

③ The connecting rod is forged from high-strength alloy steel material, enhancing its strength.

④ Type I linkage structure, using less material to ensure the required strength of the design.

(5) Camshaft

Manufactured from high-strength alloy steel, enhancing camshaft strength and lifespan.

② Utilizing a large diameter camshaft and large cam structure, the intake profile has been improved, slowing the valve seating speed and reducing impact force, thereby enhancing valve wear. Additionally, vibration is minimized, leading to increased engine reliability and durability.

③ Cam surface is ultra-fine polished to ensure reliable cam motion path.

(6) Turbocharger

Utilizing small wheel diameters, the compact structure boasts high compression ratios and a broad flow range, effectively reducing the engine's exhaust temperature, enhancing emissions performance, and improving reliability. It meets the demands of high-power engines and the matching requirements for high-altitude engine operation.

2. Features of the Stanford Generator

Insulation and varnishing:

The insulation grade is "H" class. All wound components are made from specially formulated materials and coated with a special varnish process, ensuring reliable operation of the generator in harsh environments. The specially developed resin-based material provides high processing strength and high mechanical strength for the coils and rotating parts.

(2) Winding and electrical performance:

All Stanford generator windings are wound with a 2/3 pitch, effectively eliminating the third and its multiples harmonic voltages, and are designed for non-linear loads such as uninterrupted power supply equipment. When paralleled with the grid, the 2/3 pitch structure suppresses excessive neutral current that can be produced by larger coil pitches. A fully continuous damping winding reduces oscillations during parallel generator operation. This 2/3 pitch winding, with carefully selected poles and teeth, inhibits waveform distortion in the output voltage.

(3) Overload Capacity:

The Stanford land-based generator can operate at 110% overload for 1 hour every 12 hours.

(4) Phone Interference:

THF (as defined by BS EN60034—1) is less than 2%. TIF (as defined by NEMA Mgl-22) is less than 50.

(5) Radio Frequency Interference

Brushless units and high-quality AVR ensure minimal interference during radio transmission, meeting the requirements of BSEN61000-6 standard. An additional Radio Frequency Interference Suppressor (RFI) is available upon request.

(6) Terminal Blocks and Connectors Boxes

Standard generators are three-phase and capable of reconnecting the 12 terminal heads connected to the terminal block, which is mounted on the non-drive end of the generator's output panel. The output box, made of steel plate, contains an AVR and has ample space for user wiring. For ease of operation, the panel is removable.

3. Control System

Control systems refer to the controller section and its matching electrical components and electrical elements. Controllers are primarily categorized into single machine controllers, multi-machine parallel controllers, and unattended three-remote controllers. Electrical components typically include circuit breakers, relays, speed controllers, sensors, and meters, etc.

4. Random Essential Accessories

(1) 40℃/50℃ Suitable Radiator Reservoir, Belt-driven Cooling Fan, Fan Safety Guard.

Section 2: Optional Attachments for Diesel Generators

The so-called optional accessories are clearly components designed to enhance the expandability and performance of the power generation product, beyond the standard configuration of the diesel generator set, and these are additional items that require separate purchase. The following devices are optional, and it is necessary to declare the additional purchase requirements in advance when ordering from the diesel generator manufacturer to ensure the required functionality after installation.

Battery Floating Charger

External floating charger with strong charging function, enabling rapid charging of the battery, as well as regular charging of the battery cells. Its appearance is shown in Figure 3, and the wiring diagram is shown in Figure 4. Once the strong charging mode is selected, the output voltage will rise by 0.35V. (Note: The strong charging mode must be charged according to the instructions provided by the battery manufacturer. Failure to do so may damage the battery and increase maintenance costs.) Specifications:

Operation:

The charger outputs current K to the battery terminal until the terminal voltage reaches the float charging setpoint K, which is pre-set. When the battery voltage drops to the lower limit due to load usage, the charger will restart the output current to charge the battery M until its terminal voltage H is reached. The shutdown setpoints are listed in Table 1 below.

(2) AC Input: 220-250VAC 50/60Hz (specify at time of order)

(3) Output Current: 3A or 5A (specify at time of order)

(4) Environmental Temperature Range: -10 to +60°C

(5) Indicator Light: LED Charger Indicator Light

(6) Protection Functions: Short Circuit, Overvoltage 11, Overcurrent, Reverse Polarity, Reverse Charging Mode: 0.35V higher than float voltage.

(7) DC Output: Rated 12VDC or 24VDC (specify at time of order)

2. Fuel storage tank

The fuel tank of the generator set should be capable of storing enough fuel to ensure continuous operation at full load for over 8 hours, and it is advisable to avoid refueling the tank while the generator set is running. After the fuel tank is placed, the fuel level should not exceed 2.5 meters above the base of the diesel generator. If the fuel level in the outdoor fuel storage tank is higher than 2.5 meters, an additional fuel storage tank should be added between the outdoor fuel storage tank and the diesel generator set to ensure that the pressure of the direct fuel supply does not exceed 2.5 meters. Even during the shutdown of the diesel generator set, fuel is not allowed to flow into the diesel engine by gravity through the fuel intake or injection lines.

3. Dual Power Conversion Cabinet

The mains power switch is available in manual and automatic (abbreviated as ATS) types. If your diesel generator is used as an auxiliary power source, it is mandatory to install a mains power switch at the power input point. It is strictly prohibited to input the self-provided power source by relying on temporary wiring methods or memory-based operations. Because once there is unauthorized connection to the grid (referred to as back-feeding), it can lead to serious consequences such as injuries and equipment damage. The installation of the switch must be inspected and approved by the local power supply department before it can be put into use.

4. Parallel cabinet

The paralleling cabinet for diesel generators is designed with an automatic management system to accommodate simultaneous use of two or more generators. It features all the functions of a manual paralleling panel. When the switch is set to the "Automatic" position, the automatic synchronizer can automatically adjust the frequency and phase of the units to be paralleled, outputting a closing signal during synchronization to achieve automatic paralleling. It is equipped with a programmable controller that can automatically control load balancing, load demand, and unit operation scheduling, ensuring reliable grid operation. In the event of a power failure, it can automatically start the generator set, perform automatic paralleling, and monitor various faults in the paralleled system.

5. Water Heater

The diesel generator set water jacket heater maintains a certain engine temperature, preventing the generator set from cracking in winter, and allows the diesel engine to start quickly in extreme cold conditions. The water jacket heater keeps the water temperature within the set range (approximately 35 °C), indirectly heating the lubricating oil due to heat transfer, thereby avoiding condensation. This keeps the diesel generator set in a warm standby state, enabling emergency start-up at any time, regardless of the severe winter, and quickly reaching full load in a short period. The mechanical wear of the diesel generator set is reduced, and the output power is stable. The structure of the water jacket heater is shown in Figure 5.

6. Oil Heater

The oil heater is typically used as a heating element in the fuel tank of a generator set to preheat the engine. By adding such a device, the generator set can still start normally even in cold conditions or in environments with low temperatures. In cold environments, such as winter in northern China, the engine in the generator set may not reach the ignition point of the oil in the tank due to the outside temperature, leading to difficulties in starting the generator set in cold conditions. Using a heater for preheating can help ignite the generator set and provides a safety measure. The appearance of the oil heater is shown in Figure 6.

7. Whisper Quiet Generator Sets

The silent type generator set primarily refers to units with protective enclosures, mainly categorized into silent box type generator sets (as shown in Figure 7) and container type generator sets (as shown in Figure 8). Key features include low noise and high mobility. With the continuous development of urbanization, the demand for power facilities in construction power supply, backup power supply, and power supply guarantee is also increasingly stringent, particularly in terms of noise control, design aesthetics, and equipment hoisting capabilities.

Summary:

Selecting a brand supplier with excellent after-sales service and maintenance support ensures reliable power use. As diesel generators are a long-term investment, they may require regular maintenance and repairs. Reliable service support guarantees the long-term reliable operation of the equipment. Since diesel generator sets play a crucial role in various fields, understanding their configuration, application areas, and selection considerations can help choose the right diesel generator set and ensure a reliable power supply.