WOODWARD 9907-149

Description

Product Overview

The WOODWARD 9907-149 is a specialized governor control card or actuator driver module from Woodward’s extensive line of turbine and engine control products. This module serves as a critical interface within a larger control system, such as a WOODWARD 9907 series speed governor or load-sharing controller. The primary function of the WOODWARD 9907-149 is to convert low-level control signals (e.g., 4-20 mA or ±10 VDC) into high-power drive signals to precisely position a hydraulic actuator or servo valve, which in turn controls fuel flow or steam admission to a prime mover. The exact performance of this module is critical for stable speed or load control.

Key Product Parameters

• Product Type: Servo/Actuator Driver Card, Governor Control Module

• Compatible System: Part of the Woodward 9907 Governor or similar control platform.

• Function: Acts as a servo amplifier. It receives a position command signal from the governor’s CPU and provides the power output to drive a proportional solenoid valve, torque motor, or linear actuator.

• Input Signal: Typically accepts an analog command signal (e.g., 4-20 mA, ±10 VDC) and potentially a position feedback signal (LVDT/RVDT) for closed-loop control.

• Output Signal: Provides a high-current drive output (e.g., ±80 mA or more) suitable for directly driving a specific type of hydraulic servo valve or actuator coil.

• Gains & Adjustments: Features adjustable gain, compensation, and biasing potentiometers for tuning the dynamic response of the actuator loop.

• Diagnostics: May include status LEDs for power and fault conditions.

• Mounting: Designed as a plug-in card for a specific Woodward controller chassis.

Advantages and Core Features

The primary advantage of the WOODWARD 9907-149 is its application-specific design for precise and robust actuator control in turbine systems. It is optimized for the fast dynamic response and high reliability required for governing engines and turbines. The module typically includes protective features like output current limiting and fault detection to safeguard both the driver and the expensive actuator it controls. Its integration within the Woodward ecosystem ensures compatibility and simplifies tuning, as the module’s characteristics are well-understood within the broader control strategy. The 9907-149 is engineered for long-term stability in the challenging temperature and vibration environment of a turbine control cabinet.

Application Scenarios

This driver card is used in the final control element stage of turbine and engine governing systems:

• Gas Turbine Control: Driving the fuel metering valve actuator to precisely control gas turbine speed and load.

• Steam Turbine Governing: Positioning the steam control valves to regulate steam flow and turbine speed/power output.

• Diesel/Gas Engine Governing: Controlling the rack or actuator on a fuel injection system for generator set (genset) or marine propulsion engines.

• Hydroelectric Turbine Control: Adjusting wicket gates or nozzle needles via hydraulic actuators for precise power regulation.

Comparison with Competing Products

Competing products are servo driver cards from other turbine control manufacturers like GE (Mark VIe actuator boards) or custom amplifiers from motion control companies. The WOODWARD 9907-149 is distinguished by its deep integration and optimization for Woodward’s control algorithms and actuator hardware. Compared to a generic servo amplifier, the 9907-149 is pre-configured for the specific voltage/current ranges and dynamic response needed for turbine actuators, and its adjustments are tailored for governor tuning (droop, gain, stability). It is a proprietary, application-hardened component.

Selection Guide and Important Notes

Selecting the WOODWARD 9907-149 is almost exclusively for direct replacement of a failed module in an existing Woodward governor. It is not a stand-alone, off-the-shelf product for new designs.

Important Precautions:

• Exact Replacement Part: This is a proprietary spare part. The module must be an exact part number match (9907-149) for the specific controller chassis. Different revisions may exist and must be verified.

• Actuator Compatibility: The module is designed to drive a specific type and model of actuator/servo valve. Replacing it does not change the actuator’s electrical characteristics.

• Tuning Required: After replacing the 9907-149 card, the actuator loop (gain, bias, compensation) will likely require re-tuning by a qualified turbine control engineer to restore optimal system performance and stability.

• Static-Sensitive: Handle the card with proper ESD (electrostatic discharge) precautions.

• System Knowledge: Installation and troubleshooting require detailed knowledge of the specific Woodward governor model (e.g., 9907-XXX) and its wiring diagrams.

• Legacy Consideration: This part may be for a legacy system. Verify availability and consider the long-term support strategy for the overall control system.

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