Description
Woodward 8440-1706D
Technical Specifications
- Power Supply: Wide-range DC input typically operating between 8 to 32 VDC, with a maximum power consumption of 18W.
- Analog Inputs: Supports 4 to 20 mA or 1 to 5 VDC signals for load sharing or process control.
- Analog Outputs: Configurable options including ±2.5 VDC, 0.5–4.5 VDC, or 1–5 VDC, alongside a 500 Hz PWM output.
- Discrete Inputs: Rated for 18 to 40 VDC at 10 mA.
- Relay Driver Outputs: Capable of sinking 200 mA at 18 to 40 VDC.
- Measuring Inputs: Supports 100 Vac, 5 A true RMS measurement for accurate power calculations.
Functional Features
- Automatic Synchronization: Achieves precise frequency, phase angle, and voltage matching using slip frequency, phase match, or voltage match methods.
- Load Distribution: Provides analog or discrete output bias signals to ensure uniform active load sharing among parallel generators.
- Generator Protection: Offers comprehensive protection including overcurrent, overvoltage, and undervoltage, along with soft unloading and power limiting.
- Communication: Supports Ethernet, CAN, and Modbus protocols for seamless integration with plant DCS/PLC systems and remote monitoring.
Application Scenarios
Widely deployed in industrial power generation facilities, marine propulsion systems, and microgrids where multiple diesel or gas engine-driven generators must operate in parallel with precise load balancing and high reliability.
Performance Parameters
- Synchronization Accuracy: High-precision matching ensuring smooth breaker closure.
- Load Sharing Accuracy: Ensures proportional kW distribution based on generator ratings.
- Power Calculation: True RMS power calculation for accurate metering and control.
Material Composition
Housed in a ruggedized metal backplate enclosure designed for panel mounting. Internal printed circuit boards feature industrial-grade components with conformal coating to protect against moisture, dust, and corrosive industrial atmospheres.
Structural Characteristics
- Dimensions: Approximately 264 mm × 461 mm × 58 mm.
- Weight: Roughly 800 grams.
- User Interface: Integrated two-line LCD display (24 characters per line) for real-time parameter viewing and alarm indication.
- Operating Modes: Selectable modes including Run, Check, Permissive, and OFF via front panel.
Working Principle
The module continuously monitors the generator and bus voltages. When a close command is issued, it calculates the slip frequency and phase difference, adjusting the engine governor and AVR via bias signals until synchronization criteria are met. Once paralleled, it monitors real power and automatically adjusts the governor setpoint to maintain the desired load share.
