Woodward 9904-111 |CPU Module, Origin: United States
1.9904-111 Product Overview
The Woodward 9904-111 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. 9904-111 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 9904-111 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.
working principle
Currently, mainstream servo drives use digital signal processors (DSPs) as the control core,
Complex control algorithms can be implemented to achieve digitization, networking, and intelligence. Power devices commonly
use drive circuits designed with intelligent power modules (IPMs) as the core. IPMs integrate drive circuits internally and have fault
detection and protection circuits for overvoltage, overcurrent, overheating, undervoltage, etc. Soft start circuits are also added to the main
circuit to reduce the impact of the start-up process on the driver. The power drive unit first rectifies the input three-phase power or mains
power through a three-phase full bridge rectifier circuit to obtain the corresponding DC power. After rectification, the three-phase power
or mains power is used to drive the three-phase permanent magnet synchronous AC servo motor through a three-phase sine PWM voltage
type inverter frequency conversion. The entire process of the power drive unit can be simply described as the AC-DC-AC process. The main
topology circuit of the rectifier unit (AC-DC) is a three-phase full bridge uncontrolled rectifier circuit.
With the large-scale application of servo systems, the use, debugging, and maintenance of servo drives are important technical issues for servo
drives today. More and more industrial control technology service providers have conducted in-depth technical research on servo drives.
Servo drives are an important component of modern motion control and are widely used in automation equipment such as industrial robots and
CNC machining centers. Especially for servo drives used to control AC permanent magnet synchronous motors, they have become a research
hotspot both domestically and internationally. The current design of communication servo drives commonly adopts a current, velocity, and position
closed-loop control algorithm based on vector control. The rationality of the speed closed-loop design in this algorithm plays a crucial role in the
performance of the entire servo control system, especially in terms of speed control.
Click to learn more about Woodward”s products
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