Woodward 9905-876 |CPU Module, Origin: United States
1.9905-876 Product Overview
The Woodward 9905-876 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. 9905-876 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 9905-876 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.
What are the types of drivers
The main types of drivers include servo motor drivers, stepper motor drivers, DC servo motor drivers, AC servo motor drivers, etc.
Servo motor driver: Servo motor drivers have the advantages of fast response, high precision, and good stability,
and are one of the important types of drivers for CNC machine tools. It is suitable for high-speed and high-precision
machining applications such as milling, engraving, wire cutting, etc. There are various types of servo motor drivers,
such as analog servo drivers, digital servo drivers, etc. Among them, digital servo drivers have higher control accuracy and stability.
Stepper motor driver: A stepper motor driver refers to a circuit board that controls the stepper motor and can receive command
signals from the numerical control system to accurately move the motor to the target position. Stepper motor drivers are commonly
used for low-speed and low torque positioning movements, such as precision machining, assembly, and measurement.
DC servo motor driver: DC servo motor driver is used to control the motion of DC servo motor. DC servo motor has good speed
regulation performance and positioning accuracy, and is suitable for some occasions that require precise control.
AC servo motor driver: AC servo motor driver is used to control the motion of AC servo motor. AC servo motor has the advantages of high
efficiency, high response speed, and high reliability, and is widely used in CNC machine tools.
In addition, there are some other types of drivers, such as electro-hydraulic pulse motor drivers, electro-hydraulic servo valve drivers, etc.
, which have unique advantages in certain specific application scenarios
Click to learn more about Woodward”s products
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