500kW / 625kVA Yuchai Diesel Generator Set
With 50Hz operation, 1500r/min rated speed and 380/400/415V voltage options, the SY688 generator set can be used in factories, construction sites, mining projects, oilfield facilities, commercial buildings, infrastructure projects and emergency backup power systems.
Key Highlights
- 500kW / 625kVA prime power and 550kW / 688kVA standby power.
- Powered by Yuchai YC6TD840-D31 diesel engine with turbocharged aspiration and water cooling.
- Electronic governor and electronic unit pump fuel supply system for stable engine operation.
- Available in open type and silent type configurations.
- Standard single-unit control system with LCD display, multilingual interface, protection functions and local/remote start.
- Optional ATS panel for automatic transfer between mains and generator power.
- Optional SWT paralleling system for multi-unit operation and future capacity expansion.
- Each generator set is tested at 0%, 25%, 50%, 75%, 100% and 110% load before delivery.
Technical Specifications
| Item | Specification |
| Genset Model | SY688 |
| Prime Power | 500kW / 625kVA |
| Standby Power | 550kW / 688kVA |
| Frequency | 50Hz |
| Rated Speed | 1500r/min |
| Rated Voltage | 380/400/415V |
| Power Factor | 0.8 |
| Open Type Size | 3450 x 1500 x 1910 mm |
| Open Type Weight | 4240 kg |
| Silent Type Size | 4800 x 1500 x 2240 mm |
| Silent Type Weight | 6075 kg |
| Operating Temperature | <= 40°C |
| Altitude | <= 1000 m |
| Humidity | <= 60% |
Note: When the ambient temperature is higher than 40°C or the altitude is higher than 1000 meters, power output should be corrected according to site conditions. Excessive humidity requires corresponding measures.
Engine Specifications
| Item | Specification |
| Engine Manufacturer | Yuchai |
| Engine Model | YC6TD840-D31 |
| Aspiration | Turbocharged |
| Cooling Method | Water-cooling |
| Cylinder Arrangement | 6 cylinders, in-line |
| Displacement | 19.6 L |
| Bore x Stroke | 152 mm x 180 mm |
| Compression Ratio | 14:1 |
| Rated Speed | 1500r/min |
| Prime / Standby Engine Power | 561kW / 616kW |
| Dry Weight | 2250 kg |
| Governor | Electronic |
| Fuel Supply System | Electronic unit pump |
| Max. Allowable Exhaust Back Pressure | 10 kPa |
| Max. Allowable Intake Air Restriction | 5 kPa |
| Engine Coolant Capacity | 110 L |
| Lubricating Oil Capacity | 55 L |
| Oil Consumption Ratio | <= 0.5 g/(kW.h) |
Fuel Consumption
| Item | Specification |
| 110% Prime Power | 163.5 L/h |
| 100% Prime Power | 144.4 L/h |
| 75% Prime Power | 104.4 L/h |
| 50% Prime Power | 72.0 L/h |
Alternator Specifications
| Item | Specification |
| Rated Voltage | 380/400/415V |
| Rated Frequency | 50Hz |
| Power Factor | 0.8 |
| Rated Power | 500kW / 625kVA |
| Insulation Class | H |
| Temperature Rise Class | H |
| Protection | IP23 |
| Ambient Temperature | 40°C |
| Altitude | <= 1000 m |
| Phase | 3 |
| Winding Pitch | 2/3 |
| Number of Bearings | 1 |
| Connection Type | Star |
| Poles | 4 |
| Waveform Distortion (THD) | < 5% |
| Telephone Interference Factor (THF) | < 2% |
SWT Control System – Standard for Single Unit
The standard control system is designed for easy operation, reliable protection and convenient monitoring of the generator set.
- LCD screen with key operation.
- Multilingual display for different project requirements.
- Control and protection functions for safe operation.
- Engine and alternator parameter detection.
- Local and remote start.
- Reasonable key layout and user-friendly interface.
- Multiple communication interfaces available.
- Event logs for operation and fault tracking.
- IP65 overall protection available.
Control Box Features
- User ID display function.
- Parameters can be fully configured through PC software.
- LED and LCD alarm lamps.
- Magnetic sensor speed detection.
- Switchable work mode selectors.
- Preset auto start/stop cycle.
- Fuel quantity detection and low oil level alarm.
- Voltage and current measurement.
- Generator/mains circuit breaker control.
- Plug terminal type wiring design.
- Power saving mode and upgradable firmware.
- Real-time clock for accurate event logging.
- Modular design with excellent stability.
ATS Panel – Optional
An ATS panel can be supplied as an optional accessory for applications requiring automatic transfer between mains power and generator power.
- ATS controller integrates measurement, display and control functions.
- Suitable for mains-to-mains or mains-to-generator automatic control systems.
- Microcomputer control and all-digital technology.
- LCD display shows ATS operating status and controller mode directly.
- Operating parameters can be set through the LCD screen and controller keys.
- Voltage and frequency data can be measured and displayed.
- Fast on-load transfer between two power sources, with switching time <= 80 ms.
- Electrical and mechanical double interlock mechanism helps prevent short circuit between power sources.
SWT Paralleling System – Optional
For larger power projects or future capacity expansion, SWT can provide an optional paralleling system for genset-to-genset or genset-to-grid applications.
- Supports automatic synchronising of up to 32 generator sets.
- Automatically starts units and puts them into parallel operation according to load demand.
- Automatically adds or removes running units based on load size to improve operating economy.
- Can automatically unload, cool down and stop when mains power returns to normal.
- PLC system and touch screen can be customized according to project requirements.
- One machine, one screen design: units can work independently or in parallel.
- Chinese and English operating system with built-in fault detection.
- Convenient for future capacity expansion.
Applications
The SWT 500kW / 625kVA Yuchai diesel generator set is suitable for a wide range of prime and standby power applications, especially where stable power output and reliable backup power are required.
- Industrial plants and manufacturing facilities.
- Commercial buildings, hotels and office complexes.
- Construction sites and temporary power projects.
- Mining sites and remote operation areas.
- Oilfield and energy projects.
- Hospitals and public facilities.
- Telecom stations and infrastructure projects.
- Data centers and critical backup power systems.
- Emergency standby power supply.
Why Choose SWT 500kW / 625kVA Diesel Generator Set?
- Reliable Yuchai engine: The YC6TD840-D31 engine provides strong power output and stable performance for industrial applications.
- Flexible configuration: Open type, silent type, ATS, paralleling system, trailer and customized accessories are available.
- Strong project adaptability: 380/400/415V voltage options and 50Hz configuration meet common industrial power requirements.
- Factory-tested before delivery: Each unit is tested under multiple load conditions and inspected for protection and control functions.
- Easy operation and maintenance: LCD controller, event logs, parameter detection and remote start support efficient operation.
- Expandable power solution: Optional paralleling system supports multi-unit applications and future capacity expansion.
Standard Accessories
- Engine
- Alternator
- Chassis
- Control box
- Controller for single unit
- Circuit breaker (up to 1200kW)
- Industrial muffler
- Flange of muffler
- Bellow joint
- Shock absorber
- Test report
- Certificate of quality
- Schematic diagram
- Installation manual
- Operation manual
Optional Accessories
- Daily fuel tank / bulk fuel tank.
- Residential silencer.
- Power cable.
- Anti-condensation heater for alternator.
- Battery charger.
- Water jacket heater and oil heater.
- Fuel level sensor.
- Auto oil make-up device and auto fuel filling device.
- Soundproof enclosure or containerized enclosure.
- Exhaust pipe and hot air discharge duct.
- RS485 extension module and Ethernet communication.
- Cloud monitoring.
- ATS panel.
- Motorized circuit breaker.
- Synchronising system.
- Spare parts.
- Optional Deep Sea, ComAp and SmartGen controllers.
FAQ
Q1: What is the prime power of this generator set?
A: The prime power is 500kW / 625kVA. It is suitable for continuous operation under variable load conditions.
Q2: What is the standby power of this generator set?
A: The standby power is 550kW / 688kVA. Standby power is designed for emergency use, and no overload is allowed.
Q3: What engine does this generator set use?
A: It is powered by a Yuchai YC6TD840-D31 diesel engine with turbocharged aspiration, water cooling, electronic governor and electronic unit pump fuel supply system.
Q4: What voltage and frequency are available?
A: The standard configuration is 50Hz, 1500r/min, with rated voltage options of 380V, 400V and 415V. Other requirements can be discussed according to the project.
Q5: Is a silent type available?
A: Yes. The silent type configuration is available. According to the specification, the silent type size is 4800 x 1500 x 2240 mm, with a weight of 6075 kg.
Q6: Can this generator set work with ATS?
A: Yes. An ATS panel is available as an optional accessory for automatic transfer between mains power and generator power.
Q7: Can multiple units operate in parallel?
A: Yes. SWT can provide an optional paralleling system for genset-to-genset or genset-to-grid applications, supporting automatic synchronising of up to 32 units.
Q8: What tests are carried out before delivery?
A: Each generator set passes load tests at 0%, 25%, 50%, 75%, 100% and 110%, as well as inspection of protection devices and control systems before delivery.
Q9: What applications is this 500kW diesel generator suitable for?
A: It is suitable for factories, construction sites, mining projects, oilfield facilities, commercial buildings, data centers, telecom stations and emergency backup power applications.
Q10: What optional accessories can be selected?
A: Optional accessories include fuel tank, soundproof enclosure, containerized enclosure, trailer, ATS panel, synchronising system, RS485 communication, Ethernet communication, cloud monitoring and spare parts.
