When selecting a diesel generator set, consider its comprehensive performance and economic indicators, the location of the generator manufacturer or distributor, their actual expertise, and their after-sales service capabilities. Then, consider whether the power of the selected generator set matches the power demand. The Cummins diesel generator set standard configuration includes not only the Cummins diesel engine and the Stamford generator as the main units but also the auxiliary components provided. You can understand the basic information of the standard configuration by referring to the technical specifications in the Cummins power product manual, the quotation sheet, and the information published on the Cummins website. A lack of the standard configuration can, to some extent, affect the operation and performance of the diesel generator set. This article specifically describes the types and main functions of the optional and standard accessories for the Cummins diesel generator sets.

I. Standard Optional Accessories for Charcoal-Fired Equipment

The diesel generator set is primarily composed of three major components: Cummins diesel engine, Stanford generator, and PC3.3 control system. 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 ribbing layout and wide skirt design enhance the cylinder body's rigidity and strength, reducing vibration and noise, thereby improving the engine's reliability.

② Large cylinder bore design, accommodating 4 larger valves, not only reduces intake resistance and improves filling efficiency, enhancing fuel economy, but also extends valve life and boosts engine reliability.

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

④ Increase the optional mounting bracket positions for fan installation to enhance bracket rigidity.

⑤ Utilizes standard low-pressure cylinder sleeves, with improved surface roughness.

(2) Cylinder Head

One pot, one lid, easy for maintenance.

② Featuring a four-valve (two intake, two exhaust) design, it offers low intake resistance, significantly enhancing the filling efficiency and benefiting the combustion completeness.

③ The exhaust outlet and exhaust duct have been improved to a transition change structure, utilizing pulsating air ducts for optimal utilization of exhaust energy.

④ High-strength cast iron material is used, further enhancing the impact resistance of the cylinder head. Increased valve stiffness enhances the engine's over-revving capability.

(3) Crankshaft

Forged from high-strength alloy steel material, enhancing crankshaft strength and lifespan.

② Axle neck overlap effectively improves the stiffness and strength of the crankshaft, enhancing reliability.

③ 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, enhancing the crankshaft strength; induction hardening up to 2.2mm depth on crankshaft journals, improving wear resistance.

(4) Pistons and connecting rods

Pistons are made of suitable aluminum alloy materials, featuring low inertia at high-speed operation, excellent thermal conductivity, and sufficient strength to meet working requirements.

② The cylinder skirt design with a drum face ensures proper fit during operation, providing ample bearing surface while avoiding both excessive tightness and clearance that could cause knocking.

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

④ Type I linkage structure, ensuring the required strength with less material.

Camshaft

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

② Employing a large-diameter camshaft and large cam structure, the intake profile is improved, slowing the valve seating speed and reducing impact force, thereby enhancing valve wear. Moreover, vibration is minimized, increasing the engine's reliability and durability.

③ Cam surface is ultra-finished polished, ensuring reliable cam motion path.

Turbocharger

Utilizing small wheel diameters, the compact structural dimensions, high pressure ratio, and broad flow range effectively reduce the engine's exhaust temperature, improve emissions performance, and enhance reliability. This meets the demands of high-power engines and the matching requirements for high-altitude engines.

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 materials provide high processing strength and high mechanical strength for the coils and rotating parts.

(2) Winding and electrical performance:

All Stanford generator windings are wound in a 2/3 pitch, effectively eliminating the third harmonic and its multiples, and are designed for uninterrupted power supply equipment and nonlinear loads. When paralleled with the grid, the 2/3 pitch structure suppresses excessive midline current that can be produced by larger coil pitches. A fully continuous damping winding reduces oscillations during parallel operation of the generator. This 2/3 pitch winding, with carefully selected poles and teeth, matches to suppress waveform distortion of 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 in BS EN60034—1) is less than 2%. TIF (as defined in NEMA Mgl-22) is less than 50.

Radio 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 (RFI) suppressor is available upon request.

(6) Terminal blocks and junction boxes:

Standard generators are three-phase and can be reconnected to the 12 terminal heads connected to the terminal block, which is mounted on the non-driven end of the generator's output board. 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 mainly categorized into single machine controllers, multi-machine parallel controllers, and unmanned three-remote controllers. Electrical components generally include circuit breakers, relays, speed controllers, sensors, meters, and more.

4. Randomly Required Accessories

(1) Suitable for 40℃/50℃ environmental radiator tank, belt-driven cooling fan, fan safety guard.

2. Optional Accessories for Diesel Generators

The so-called optional accessories are clearly components that are not part of the standard configuration of a diesel generator set. These are designed to enhance the functionality and performance of the power generation product, and they are all additional items that require separate purchase. The following devices are optional; when ordering from the diesel generator manufacturer, it is necessary to declare the additional purchase requirements in advance to ensure the desired functionality after installation.

Battery Float Charger

External floating charger with strong charging function, capable of rapidly charging lead-acid batteries and also for regular charging of battery cells. As shown in Figure 3, the wiring diagram is illustrated 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 charge K set value, which is pre-set. When the battery voltage drops to the lower limit due to load usage, the charger will re-supply output current to charge the battery M to its terminal voltage H. The shutdown set values 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 charging voltage.

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

2. Storage Oil Tank

The fuel tank of the generator set should be capable of providing fuel for 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 must not exceed 2.5 meters above the base of the diesel generator. If the fuel level in an outdoor fuel storage tank is higher than 2.5 meters, a fuel storage tank should be added between the outdoor storage tank and the diesel generator set to ensure the pressure of direct fuel supply does not exceed 2.5 meters. Even during the shutdown of the diesel generator, fuel is not allowed to flow into the diesel engine by gravity through the intake or fuel injection lines.

3. Dual-power conversion cabinet

The main power switch is available in manual and automatic types (abbreviated as ATS). If your diesel generator is used as an auxiliary power source, a main power switch must be installed at the power input point. It is strictly prohibited to supply power to the load using temporary wiring methods or relying on memory-based operations. Because if unauthorized power is fed back into the grid (known as back-feeding), it can lead to severe 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 equipped with an automatic management system to cater for the simultaneous operation of two or more generators, featuring all functionalities 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 for automatic paralleling. An integrated programmable controller is designed to automatically control load balancing, load requirements, and unit scheduling to ensure 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 temperature for the engine, preventing the generator set from cracking in winter and allowing for quick and rapid startup of the diesel engine in cold, low-temperature conditions. The water jacket heater keeps the temperature of the water in the generator set's jacket within the set temperature range (about 35 °C), indirectly heating the lubricant through heat transfer, thereby avoiding condensation. This keeps the diesel generator set in a warm standby state, enabling emergency startup at any time during severe winters, and to reach full load in a short time. This reduces mechanical wear on the diesel generator set and ensures stable output power. The structure of the water jacket heater is shown in Figure 5.

6. Oil Heater

Oil heaters are commonly used as heating elements in the fuel tanks of generator sets 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, such as during winter in northern regions of our country. In low-temperature environments, the engine in the generator set may fail to reach the ignition point of the oil in the tank due to the external temperature, leading to difficulties in starting the generator set in cold conditions. Using a heater for preheating can help ignite the generator set, providing a safeguard. The appearance of the oil heater is shown in Figure 6.

7. Silent-type Generator Set

Silent-type generator sets primarily refer to those equipped 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 levels and high mobility. With the continuous development of urbanization, the demand for power facilities in construction, backup, and emergency power supply is also increasing, especially in terms of noise control, design aesthetics, and equipment lifting capabilities.

Summary:

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