I. Product Overview

The C550 D5 diesel generator set is a heavy‑duty, industrial‑grade power unit engineered for reliable standby, prime, and continuous operation in commercial buildings, industrial facilities, infrastructure projects, and mission‑critical applications. Built to Cummins Power’s global unified design, manufacturing, and testing standards, this unit delivers stable power output, strong durability, and low maintenance cost. It adopts a genuine Cummins engine, high‑performance brushless alternator, and intelligent PowerCommand control system, fully complying with ISO 8528 and GB/T 2820 standards. With robust load capacity, reliable protection functions, and a nationwide after‑sales support network, the C550 D5 provides a safe, stable, and long‑life power solution for emergency backup and uninterrupted on‑demand power supply.

II. Core Components

1. Engine System

Model: Cummins QSX15‑G8

Type: Four‑stroke, water‑cooled, turbocharged & air‑to‑air intercooled diesel engine

Structure: Forged steel crankshaft and connecting rod, cast iron cylinder block

Bore × Stroke: 137 mm × 169 mm

Rated Speed: 1500 rpm

Governor Type: Electronic control

Starting System: 24V DC, negative ground

Charging Alternator: 24V, 35A

Lubricating Oil Capacity: 91 L

Coolant Capacity (engine + radiator): 104 L

Compression Ratio: 17.01

Technical Highlights:

• Original Cummins electronically controlled fuel system ensures efficient combustion and stable output.

• Closed water cooling with thermostat maintains optimal operating temperature.

• High‑strength structural parts support long‑term heavy‑duty operation.

• Equipped with Cummins Fleetguard high‑precision filters for enhanced engine protection.

2. Generator System

Model: Stamford HC series (HC1544D)

Type: Brushless, drip‑proof, single bearing, 4‑pole AC synchronous generator

Output: 550 kVA (standby) / 500 kVA (prime); 440 kW (standby) / 400 kW (prime)

Output Configuration: 230/400 VAC, three‑phase four‑wire, 50 Hz, 0.8 PF (lagging)

Insulation Class: Class H

Protection Class: IP23

Temperature Rise: 150 °C (standby, at 40 °C ambient)

Telephone Harmonic Factor (THF): <2%

Voltage Waveform Distortion: <5% under balanced linear load

Technical Highlights:

• Slotted stator with 2/3 pitch winding suppresses third harmonic and waveform distortion.

• Optimized damper winding reduces oscillation during parallel operation.

• Flexible drive disc directly connects to engine for smooth power transmission.

• Stable voltage output suitable for precision electrical and industrial loads.

3. Intelligent Control System

• Model: KING POWER DS9610B

• Functions:

  • Automatic Start/Stop: Activates automatically upon mains power failure and shuts down upon restoration.

  • Remote Monitoring: Supports data transmission via RS485/CAN bus interfaces with MODBUS protocol compatibility.

  • Fault Diagnosis: Real-time monitoring of oil pressure, water temperature, speed, and other parameters; triggers protective shutdown upon exceeding limits.

  • Parallel Operation Control: Optional automatic paralleling module for multi-unit parallel operation.

  • Energy-Saving Mode: Adjusts engine speed automatically based on load demand to reduce fuel consumption.

• Operating Interface: 7-inch LCD touchscreen with Chinese/English language options, displaying operational parameters, fault codes, and maintenance reminders.

III. Performance Parameters

IV. Application Fields

The Cummins C550 D5 diesel generator set (550kVA / 440kW standby, 500kVA / 400kW prime) is designed for continuous operation and emergency backup in various heavy‑duty scenarios. It is widely applied in the following fields:

1. Industrial Manufacturing

   Suitable for large factories, machinery plants, chemical plants, textile mills, and processing workshops, providing stable backup power to avoid production downtime and equipment damage caused by grid outages.

2. Commercial & Public Buildings

   Ideal for high‑rise buildings, shopping malls, hotels, hospitals, data centers, banks, and office complexes, ensuring uninterrupted power for lighting, elevators, HVAC, security systems, and critical electrical equipment.

3. Infrastructure & Construction Sites

   Used for road, bridge, tunnel, railway, and airport construction projects, supplying reliable on‑site power for construction machinery, lighting, and temporary facilities.

4. Mining & Oil & Gas Projects

   Provides stable independent power for remote mining areas, oil drilling sites, and gas facilities, supporting long‑hour continuous operation in harsh environments.

5. Telecommunication & Data Centers

   Ensures 24/7 power supply for communication base stations, IDC data centers, network equipment rooms, and server clusters, maintaining signal transmission and data security.

6. Real Estate & Property Management

   Used as standard emergency power support for residential communities, industrial parks, logistics centers, and integrated properties, meeting safety and reliability requirements.

7. Shipyards & Port Facilities

   Applied in port terminals, container yards, and shipbuilding bases for backup power of loading equipment, monitoring systems, and office areas.

8. Agriculture & Irrigation Stations

   Supports farm irrigation systems, grain drying equipment, and aquaculture bases with stable off‑grid or standby power.

V. After-Sales Service

• Warranty Period: 1 year or 1000 operating hours (whichever comes first).

• Service Network: Over 300 service centers nationwide with 24-hour emergency response.

• Parts Supply: Sufficient inventory of genuine parts with 48-hour delivery.

• Training Support: Free operator training and maintenance guidance.

VI. Selection Recommendations

Choosing the right power solution requires careful consideration of your operational environment, load characteristics, and long-term usage needs. The following recommendations help you determine if the Cummins C550 D5 (550kVA / 440kW standby) is the ideal fit for your project:

1. Standby vs. Prime Power Application

   • Standby Power (Recommended Use): This unit is best suited as an emergency backup power source for facilities connected to a stable main grid. It is designed for use during power outages to protect critical loads. It should not be used as a primary power source for continuous, year-round operation without proper derating and maintenance planning.

   • Prime/Continuous Power: For applications where the generator will serve as the main power source (e.g., remote construction sites, mining operations, or areas with unreliable grids), we recommend evaluating the 400kW prime power rating. Continuous operation above the prime rating will shorten the engine's service life and increase maintenance costs.

2. Load Calculation & Starting Requirements

   • It is crucial to calculate your total connected load, including any large motors or equipment with high inrush currents.

   • For inductive loads (motors, pumps, compressors), the generator must handle starting currents that can be 3–6 times the rated running current. The C550 D5's robust alternator design is well-suited for this, but proper load analysis is required to avoid voltage dips or starting failures.

3. Operating Environment & Altitude

   • The unit's performance is rated at standard ambient conditions (sea level, 25°C). At altitudes above 1000 meters or temperatures above 40°C, engine power will naturally derate. If your site is located in a high-altitude or tropical region, please consult our technical team for a derated power calculation to ensure the unit meets your requirements.

   • For dusty, corrosive, or highly humid environments, additional options like air filters, enclosures, and anti-corrosion treatments are recommended.

4. Future Expansion & Redundancy

   • It is common practice to size the generator for 70–80% of its rated capacity under normal operation. This provides a safety margin for future load additions and allows the engine to operate at its most efficient range, reducing fuel consumption and wear.

   • For mission-critical applications (data centers, hospitals), consider a parallel or N+1 redundant setup to ensure continuous power even during maintenance or servicing.

5. Fuel Quality & Emissions Compliance

   • The engine is designed to run on standard diesel fuel (ISO 8217). The use of poor-quality fuel will significantly impact performance and longevity.

   • This model complies with China National Phase III emission standards. If your project requires higher emission standards (e.g., Tier 3 or higher), please inquire about our alternative engine options.

6. Maintenance & Serviceability

   • This Cummins-powered genset benefits from a global service network and readily available parts. Ensure you have a maintenance plan in place, including regular oil changes, filter replacements, and load bank testing, to maximize reliability and lifespan.