Woodward 9903-557 |CPU Module, Origin: United States
1.9903-557 Product Overview
The Woodward 9903-557 belongs to the 505/505E series digital turbine controllers. It is a microprocessor-based control module designed for single-valve steam turbines,
including single extraction/admission systems or split-range actuator configurations.
The controller features a front panel Operator Control Panel (OCP) with a two-line, 24-character display and multi-function keypad, allowing easy on-site configuration and monitoring.
2. 9903-557 Technical Specifications and Parameters
| Parameter | Details |
|---|---|
| Power Supply | +24 VDC, approx. 1 A |
| I/O Outputs | Discrete Outputs: 8 Analog Outputs: 6 Actuator Outputs: 2 |
| Display / HMI | Two-line, 24-character LCD, with multi-function keypad |
| Dimensions | Approx. 14 × 11 × 4 in (35.6 × 27.9 × 10.2 cm) |
| Weight | Approx. 9.11 lbs (4.13 kg) |
| Operating Temperature | –4 to +140 °F (–20 to +60 °C) |
| Storage Temperature | –40 to +185 °F (–40 to +85 °C) |
| Humidity Standard | 95% RH at 20-55 °C for 48 hours without damage |
| Protection Class | Typically meets industrial dust and water protection standards |
| Communication Protocol | Supports Modbus, RS-232 / RS-422 serial interfaces |
3. Brand History
Woodward, Inc., founded in 1870 and headquartered in Fort Collins, Colorado, USA, is a global leader in energy control systems. The company has a long history of innovation in turbine control, engine management,
and power generation systems.
Woodward products are widely recognized for their reliability and precision in demanding industrial and power generation applications.
4. Applications in Industrial Automation
The 9903-557 plays a critical role in industrial automation and power generation environments:
- Steam Turbine Control: Manages startup, speed regulation, and extraction/admission control of steam turbines.
- Power Generation Systems: Used in power plants to regulate turbine-driven generators for stable frequency and load management.
- Compressor and Pump Drive Control: Ensures precise speed control for turbine-driven compressors and pumps.
- Process Industry Applications: Applied in chemical plants, refineries, and other industries requiring precise turbine operation.
- Safety and Protection Functions: Includes overspeed protection, critical speed avoidance, actuator travel limits, and event logging for operational safety.
Enable and detect module connection diagram
4. Characteristics of testing system software
The testing system software is developed according to software engineering requirements, striving to achieve powerful functionality,
stability, and reliability. At the same time, the software is expanded to have expert system functionality.
4.1 Human Computer Interaction Interface
The interface is the manifestation of the testing system and the window for users to analyze and judge. Users can set self check and test items
as well as perform printing and fault diagnosis. Set the project to be tested in the human-computer interaction interface, and the computer sends
speed commands to the tested driver. The data obtained through a dedicated interface
and other testing equipment is analyzed and compared online by the testing software to provide a conclusion on whether it is qualified or not.
At the same time, the expert diagnostic knowledge base is called to diagnose the fault and provide a solution to the fault. The composition of the
human-computer interaction interface module is shown in Figure 5.
Figure 5: Module diagram of human-computer interaction interface
4.2 Testing System Dynamic Link Library
The dynamic link library of the testing system adopts the standard access method ODBC (Open Database Connectivity), and establishes a
set of dynamic link library DLLs, namely the driver basic information database and the specialized machine diagnostic knowledge database.
The main content of the basic information database of the drive is the technical parameters of the drive, and the expert diagnostic knowledge
database mainly analyzes typical faults of the drive. If users need to expand the content of the expert diagnostic knowledge database,
they can add it through the human-machine interface.
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