Woodward 9905-020D |CPU Module, Origin: United States
1.9905-020D Product Overview
The Woodward 9905-020D 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.
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2. 9905-020D 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 9905-020D 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.
Automation: Microcontrollers can achieve various automation functions through program control, such as smart homes,
smart factories, smart transportation, etc., making devices more intelligent and efficient.
Microcontrollers have a wide range of applications in industrial automation, home intelligence, medical devices,
automotive electronics, and other fields, and are an important component of modern electronic technology.
The Relationship between Microcontrollers and Chips
A microcontroller is a chip that integrates functional modules such as a microprocessor, memory, input/output interfaces,
and timer. Therefore, a microcontroller is essentially a chip, which is a type of integrated circuit.
Compared with general integrated circuits (ICs), microcontrollers are more integrated and functionally complete,
with 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. Therefore, microcontrollers have been widely used in electronic control systems, such as industrial automation,
home intelligence, medical devices, vehicle electronics, and other fields.
Therefore, microcontrollers are a special type of chip that integrates more functional modules and processing capabilities,
and can independently complete various control tasks.
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