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The WOODWARD 9907-164 is a Digital Microprocessor Controller Module specifically designed as part of the Woodward 505 and 505E series Microprocessor-based Governor Control Units. These units are primarily engineered for the control and regulation of steam turbines, turbogenerators, and turboexpander modules.
WOODWARD 9907-164: Digital Control for Steam Turbines
The 9907-164 module provides sophisticated digital control for various aspects of steam turbine operation, focusing on precise speed, load, and extraction/admission control. It’s a robust and reliable component widely used in power generation and process industries.
Primary Function and Role:
The Woodward 9907-164 serves as the brain of the 505/505E turbine control system for single extraction and/or admission steam turbines. It manages the turbine’s steam inlet valves, often utilizing split-stage actuators, to precisely control:
- Turbine Speed: Maintaining a set speed under varying load conditions.
- Load Control: Regulating the turbine’s power output.
- Extraction/Admission Control: Managing steam flow to and from intermediate stages of the turbine, crucial for process applications or combined heat and power (CHP) plants.
It replaces older, less flexible analog or mechanical governors with a highly configurable and accurate digital control solution.
Key Features and Capabilities:
- Digital Microprocessor Control: Utilizes advanced digital signal processing for high precision, reliability, and complex control algorithms (e.g., PID control).
- Configurable for Steam Turbines: Specifically designed to control steam turbines, including those with single extraction and/or admission points. It can manage various steam inlet valve configurations using split-stage actuators.
- Integrated Operator Control Panel: Features a front-facing panel with a:
- 30 Multi-function Keypad: For parameter entry and navigation.
- Two-line, 24-character Display: For monitoring status, alarms, and configuration menus.
- This allows for on-site field configuration and monitoring via a menu-driven software interface, making it user-friendly for operators.
- Flexible I/O (Inputs/Outputs):
- Contact Inputs: Typically 16 contact inputs (4 dedicated, 12 programmable), used for sensing discrete signals like valve limits, start/stop commands, or alarm acknowledgements.
- Current Inputs: 6 programmable current inputs (4-20 mA), used for analog signals like speed, pressure, or temperature.
- Outputs: Generates output signals (e.g., 4-20mA or PWM) to actuators, throttle valves, or fuel valves.
- Advanced Control Functions: Includes a suite of standard features crucial for turbine operation:
- Critical Speed Avoidance: Automatically prevents the turbine from operating continuously at potentially damaging critical speeds during start-up or shutdown.
- Valve Limiters: Implements limits on valve positions to protect the turbine or process.
- Auto Start Sequence: Manages the automated sequence for turbine start-up.
- Shutdown Indicator/First-Out Indicator: Provides clear indication of the cause of a shutdown.
- Overspeed Test Buttons: Allows for safe testing of overspeed trip functionality.
- Communication: Often includes RS-232/RS-422 ports with Modbus protocol for communication with external systems like SCADA, DCS, or plant historians.
- Robust Design: Built for industrial environments with specified operating temperature ranges (e.g., –4 to +140°F / -20 to +60°C) and adherence to humidity standards (e.g., 20 and 55 °C at 95% for 48hrs). The enclosure typically meets standards like IEC 60529, IP56.
- Power Input: Requires a +24 VDC power supply (typically at 1 A).
What does the part number 9907-164 signify?
The 9907-164 is a specific model number within the broader Woodward 505/505E series. The “9907” prefix likely denotes its series or family within Woodward’s product line for turbine controls, and the “-164” specifies the exact configuration, features, and possibly the revision level of the module. Different numbers in this series (e.g., 9907-162, 9907-163, 9907-165, 9907-166, 9907-167) would typically denote variations in I/O count, specific control algorithms, communication options, or target turbine types (e.g., simple speed control, extraction/admission, turbogenerator sync capabilities).
Typical Applications:
The Woodward 9907-164 (and the 505/505E series it belongs to) is widely used in:
- Power Generation:
- Controlling steam turbines driving generators (turbogenerators) in conventional power plants, combined cycle plants, and industrial powerhouses.
- Controlling turboexpanders in process industries for energy recovery.
- Process Industries:
- Industrial steam turbines used for mechanical drives (e.g., compressors, pumps, fans).
- Turbines with steam extraction or admission for process heating or specific pressure requirements.
- Marine Applications: Controlling steam turbines on certain vessels.
Product Status:
The Woodward 505/505E series, including the 9907-164, is a mature and highly established product line. While it continues to be very popular and widely installed globally, Woodward has introduced newer generations of steam turbine controls (such as the 505D, 505XT, and Flex500 platforms) that offer enhanced features, performance, and modern connectivity options.
For the 9907-164, it is generally no longer available for new plant installations directly from Woodward. However, it is fully supported through Woodward and its qualified Channel Partners for:
- Spare parts and replacements: Often available in “new open box” or “rebuilt” condition from various suppliers.
- Repairs and servicing.
- Technical support for existing installations.
Users with existing 9907-164 units can continue to operate and maintain them, but for system upgrades or new projects, Woodward recommends migrating to their latest generation of turbine control solutions.
