Woodward 9905-703 | Governor | Controller | Potential Converter
1.9905-703 Product Overview
The Woodward 9905-703 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.
contacts： Mike
+86 18350224834 （WeChat/WhatsApp）
Email：Mike18350224834@gmail.com
2. 9905-703 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 9905-703 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.
Difference between Microcontrollers and Microprocessors
Microcontrollers and microprocessors are both types of integrated circuits that have certain differences in functionality and applications.
A microprocessor is a chip that only contains the central processing unit (CPU) core and does not integrate other functional
modules such as memory, input/output interfaces, timers, etc. It requires external connections to other chips to achieve various
control tasks. The design of microprocessors is more flexible, and other chips can be selected according to specific application
requirements to achieve the required functions.
A microcontroller is a chip that integrates functional modules such as a microprocessor, memory, input/output interface, and timer,
and has the ability to independently complete various control tasks. Microcontrollers generally integrate functional modules such as
processors, memory, timers, input/output interfaces, etc., which can be programmed to achieve various control and processing tasks.
Microcontrollers can work independently without the need for external chips, and have advantages such as small size, low power consumption,
high integration, and strong control capabilities. They are suitable for various embedded systems, electronic control systems, and other fields.
In summary, microprocessors and microcontrollers are both types of integrated circuits, but they have significant differences in
functionality and applications. Microprocessors are more flexible and can be connected to other chips as needed to achieve desired functions;
Microcontrollers have the ability to independently complete various control tasks, with small size, low power consumption, and high integration,
making them suitable for various embedded systems, electronic control systems, and other fields.
Click to learn more about Woodward”s products
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