When selecting a diesel generator set, it's crucial to consider its comprehensive performance and economic indicators, the location of the generator manufacturer or distributor, their actual professional level, and their after-sales service capabilities. Next, assess whether the power output of the chosen generator set matches the power demand. The standard configuration of Cummins diesel generator sets includes not only the Cummins diesel engine and Stamford generator, but also the auxiliary components provided. The basic details of the standard configuration can be found by reviewing the technical specifications in Cummins power product manuals, quotes, and 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 from Cummins specifically describes the types and primary functions of the optional and accessory parts for diesel generator sets.

1. Standard Optional Accessories for Chai Fa Products

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 rib arrangement and wide skirt design improve the cylinder body's rigidity and strength, reducing vibration and noise, thereby enhancing the engine's reliability.

② The large cylinder bore design allows for the installation of 4 larger valves, which not only reduces intake resistance and improves filling efficiency, enhancing fuel economy, but also extends the lifespan of the valves and increases the reliability of the engine.

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

④ Added optional mounting bracket positions for improved rigidity.

⑤ Utilizes a universal low-pressure cylinder sleeve, improving surface roughness.

(2) Cylinder Head

One pot, one cover, easy for maintenance.

② Utilizes a four-valve (two intake and two exhaust) configuration, featuring low intake resistance, significantly enhancing filling efficiency and promoting complete combustion.

③ The exhaust outlet and exhaust channel have been improved to a transition change structure, employing pulsating air channels, which is conducive to the full utilization of waste gas energy.

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

(3) Crankshaft

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

② The large main shaft neck overlap effectively enhances the crankshaft's rigidity and strength, improving reliability.

③ The original crankshaft structure was an insert-type balancing block design. The new design incorporates an integral crankshaft structure, significantly reducing the failure rate of the crankshaft and enhancing its reliability.

④ Induction hardening at the corner of the garden, enhancing the crankshaft strength; induction hardening up to 2.2mm depth at the crankshaft journals, improving wear resistance.

(4) Pistons and connecting rods

The piston is made of suitable aluminum alloy material, featuring low inertia at high speeds, good thermal conductivity, and sufficient strength to meet working requirements.

② The barrel face design of the piston skirt ensures proper fit during operation, offering adequate bearing surface while avoiding both excessive tightness and knocking due to excessive gaps.

③ Forged from high-strength alloy steel for connecting rods, enhancing strength.

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

Camshaft

High-strength alloy steel material manufacturing enhances camshaft strength and longevity.

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

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

(6) Turbocharger

Utilizing small wheel diameters, compact structural dimensions, high pressure ratios, and a wide flow range, it effectively reduces the engine's exhaust temperature, improves emission conditions, and enhances reliability. It meets the needs 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 treated with a special varnishing process to ensure 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 with a 2/3 pitch, effectively eliminating the third harmonic and its multiples from the voltage, making them ideal for designing uninterrupted power supply equipment and nonlinear loads. When connected in parallel 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 operation of the generator. This 2/3 pitch winding, with both poles and teeth meticulously selected, 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 MG1-22) is less than 50.

(5) 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 Suppressor (RFI) is available upon request.

(6) Terminal blocks and junction boxes:

Standard generators are three-phase and can be reconnected to the 12 connection terminals leading to the terminal board, which is mounted on the non-driven end of the generator. The outlet 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 accessories and components. Controllers are primarily 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℃ environment radiator reservoir, belt-driven cooling fan, fan safety guard.

Section II: Optional Accessories for Diesel Generators

The so-called optional accessories are clearly components that enhance the functionality of the power generation products beyond the standard configuration of diesel generator sets, improving the product performance. These are items that require additional purchase. The following are optional devices; when ordering from the diesel generator manufacturer, it is necessary to declare the additional purchase requirements in advance to achieve the desired functionality post-installation.

Battery Float Charger

External floating charger with strong charging function, capable of quickly charging lead-acid batteries and performing regular charging. 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: Strong charging mode must be charged according to the instructions provided by the battery manufacturer. Otherwise, it may damage the battery and increase maintenance costs.) Specification:

Operation:

The charger outputs current K to the battery terminal voltage until it reaches the floating charge K set point, which is already established. 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 points 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 ~ +60°C

(5) Indicator Light: LED charger indicator light

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

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

2. Oil Storage Tank

The fuel tank of the generator set should be capable of providing fuel for continuous operation of the generator set at full load for over 8 hours, and it should be avoided to refuel 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 the outdoor fuel tank is higher than 2.5 meters, a fuel storage tank should be added between the outdoor fuel 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, fuel is not allowed to flow into the diesel engine by gravity through the intake fuel line or the fuel injection line.

3. Dual Power Conversion Cabinet

The main power switch is available in manual and automatic versions (abbreviated as ATS). If your diesel generator is used as a backup power source, it is mandatory to install a main power switch at the input point of the power supply. It is strictly prohibited to supply power to the load using temporary wiring or relying on memory-based operations. As once unauthorized power is fed back into the grid (referred to as back-feeding), it can result in severe consequences such as injuries and equipment damage. The correct 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 synchronization cabinet for diesel generators is designed to meet the needs of using two or more generators simultaneously, featuring all the functions of a manual parallel screen for an automatic management system. When the switch is set to the "Automatic" position, the automatic synchronizer can automatically adjust the frequency and phase of the generators to be synchronized, outputting a closing signal during synchronization to achieve automatic parallel operation. It is equipped with a programmable controller that can automatically control load balancing, load demand, and generator scheduling to ensure reliable grid operation. In the event of a power failure, it can automatically start the generator set, perform automatic parallel operation, and monitor various faults in the parallel 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 enabling the diesel engine to start quickly in extreme cold temperatures. The water jacket heater keeps the temperature of the generator set's water jacket within the set temperature range (about 35 °C), indirectly heating the lubricating oil through heat transfer, thus avoiding condensation. This keeps the diesel generator set in a hot standby state, allowing it to start up in emergencies at any time during the severe winter, and reach full load in a short time. The mechanical wear of the diesel generator set is reduced, and the output power remains 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 regions of our country, the engine in the generator set may not reach the ignition point of the oil in the tank due to the influence of external temperatures, leading to difficulty in starting the generator set in cold conditions. Using a heater for preheating can help ignite the generator set and serves as a safeguard. The appearance of the oil heater is shown in Figure 6.

7. Silent Generator Set

The Silent Type Generator Set primarily refers to units equipped with protective enclosures, mainly categorized into Silent Enclosure 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 guaranteed power supply is also rising, especially with higher requirements for noise control, design aesthetics, and equipment hoisting capabilities.

Summary:

Selecting a brand supplier with excellent after-sales service and maintenance support is a guarantee for the user's electricity consumption. As a long-term investment, diesel generators may require regular maintenance and repairs, and reliable service support ensures the long-term reliable operation of the equipment. Since diesel generator sets play a crucial role in various fields, understanding the configuration, application areas, and selection considerations of diesel generator sets can help choose the appropriate diesel generator set and ensure a reliable power supply.