Woodward 9900-427 505 Turbine Control | 100% Original
1.9900-427 Product Overview
The Woodward 9900-427 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. 9900-427 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 9900-427 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.
feature
(1) Simple and practical: The structure of the switch controller is simple, easy to implement, and can be easily embedded into various
control systems. Its working principle is intuitive and easy to understand, without the need for complex calculations and adjustment processes.
(2) Low cost: Due to the simple structure of the switch controller, the manufacturing cost is relatively low. This makes the switch controller
highly competitive in some cost sensitive situations.
(3) Suitable for large inertia systems: The switch controller is suitable for some systems with large inertia, such as large heating furnaces,
refrigeration equipment, etc. In these systems, due to the slow response speed of the system, the switch controller can gradually adjust the
system output by continuously switching the output state, achieving a relatively stable control effect.
4、 The difference between PID controller and switch controller
control accuracy
The PID controller has high control accuracy and can achieve precise control of the system output. The control accuracy of the switch controller is
relatively low, and can only achieve rough control effects. In some situations where high control accuracy is required, such as temperature control,
pressure control, etc., PID controllers have obvious advantages.
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