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The 9907-827 is a field-proven digital control platform within the Woodward 505 series, specifically engineered for the precision management of single-valve steam turbines. This microprocessor-based governor excels at regulating turbine speed and load, offering a robust interface for...
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The 9907-827 is a field-proven digital control platform within the Woodward 505 series, specifically engineered for the precision management of single-valve steam turbines. This microprocessor-based governor excels at regulating turbine speed and load, offering a robust interface for both standalone operation and integration into plant networks. Replacing older analog systems, it features a high-speed digital logic core, ensuring tighter frequency control and faster transient response during load rejection or grid fluctuations.
Equipped with a comprehensive graphical LCD, the 9907-827 allows operators to monitor real-time PID performance, alarm logs, and system diagnostics without the need for external handheld programmers. The unit is designed specifically for "single-extraction" or "straight-condensing" turbine architectures, providing specialized algorithms for pressure and speed regulation.
| Specification | Details |
|---|---|
| Input Voltage Range | 18–32 VDC (24 VDC Nominal) |
| Control Modes | Speed Control, Load Sharing, Remote Speed Setpoint, and Extraction Pressure Regulation |
| Operator Interface | Integrated Front-Panel Graphical LCD with Tactile Keypad |
| Analog Inputs | 4–20 mA, ±5 VDC, or ±10 VDC (Configurable for transducers or remote setpoints) |
| Analog Outputs | Multiple 4–20 mA channels for actuators, tachometers, or remote monitoring |
| Discrete I/O | Programmable dry contact inputs and relay outputs for trip/alarm logic |
| Communication Interface | Dual RS-232 and RS-485 ports |
| Network Protocol | Modbus RTU (Slave) for DCS/SCADA integration |
| Operating Temperature | -25 °C to +70 °C |
The 9907-827 is primarily used in power generation and mechanical drive systems. It is widely deployed in sugar mills, paper plants, and chemical processing facilities, where precise steam extraction is critical for balancing process heat with electrical output.
No, the 9907-827 is optimized for single-valve or single-extraction steam turbines. For dual-extraction turbines, the Woodward 505E or MicroNet series is recommended.
Yes, the Modbus RTU protocol allows for both data monitoring (reads) and remote setpoint adjustments (writes) from a central master station.
