Woodward 9907-149 Digital Governor Control Unit

Product Short Description

Technical Specifications

Input Voltage: 120 Vac/dc (compatible with both alternating and direct current power sources).
Speed Sensing: Three identical speed-sensing units (A, B, C), each with an independent power supply and interface.
Speed Range: Adjustable from 250 rpm to 25,000 rpm via programmable parameters.
MPU Gear Teeth: Configurable from 20 to 120 teeth for accurate speed calculation.
Fault Timeout: Adjustable from 1 second to 533 minutes and 20 seconds.
Fault Setpoint: Range of 100 rpm to 25,000 rpm for over-speed protection.
Operating Temperature: -13°F to +140°F (-25°C to +60°C).
Dimensions: 19 inches (width) × 12.244 inches (height) × 5.62 inches (depth).
Weight: Less than 17 pounds (7.7 kg).
Display/Keyboard: Each module features a dedicated LCD screen and keypad for local configuration and monitoring.

Key Features

Triple-Modular Redundancy (TMR): Three independent speed-sensing units operate in a “two-out-of-three” voting logic. The system triggers an alarm or trip only if two units agree on a fault condition, minimizing false trips.
Hot Swapping: Modules can be replaced or tested without shutting down the connected machinery, reducing downtime.
Programmable Parameters: Users can customize speed setpoints, fault thresholds, timeout durations, and MPU gear teeth count via the local interface.
Magnetic Pickup (MPU) Compatibility: Supports MPU sensors for non-contact speed measurement, ensuring durability in harsh environments.
Data Logging: Records operational data and fault events for troubleshooting and performance analysis.
Remote Monitoring: Enables integration with distributed control systems (DCS) for centralized management.

Functional Highlights

Speed Control: Maintains precise engine or turbine speed under varying loads, preventing overspeed or underspeed conditions.
Over-Speed Protection: Automatically trips the system if speed exceeds the predefined threshold, protecting equipment from damage.
Fault Diagnosis: Provides real-time alerts for MPU failures, sensor misalignment, or electrical faults, with LED indicators for quick status checks.
Flexible Configuration: Supports standalone operation or integration into larger control networks via Modbus RTU/TCP protocols.

Application Scenarios

Power Generation: Controls generator speed in thermal power plants, hydroelectric stations, and cogeneration systems to ensure stable grid frequency.
Aerospace: Regulates engine speed in aircraft and helicopters for safe and efficient propulsion.
Industrial Automation: Manages rotating equipment (e.g., compressors, pumps) in chemical, metallurgical, and paper manufacturing plants.
Transportation: Controls engine speed in locomotives and marine vessels to optimize fuel efficiency and emissions.
Oil & Gas: Safeguards gas turbine operation in compressor stations and offshore platforms, preventing catastrophic failures.

Advantages

High Reliability: Redundant design and fault-tolerant voting logic ensure continuous operation even during single-component failures.
Ease of Maintenance: Hot-swappable modules and local configuration interfaces simplify updates and repairs.
Scalability: Adaptable to both small-scale engines and large industrial turbines through adjustable parameters.
Compliance: Meets international standards for safety (e.g., ATEX) and electromagnetic compatibility (EMC).