Woodward A9904-111 Price Discount | In Stock
1.A9904-111 Product Overview
The Woodward A9904-111 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.
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2. A9904-111 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 A9904-111 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.
Comparison of Control Characteristics
The PID controller has adaptive capability and can dynamically adjust control parameters according to actual situations. It can respond quickly
in a stable state and resist external disturbances and system changes. In addition, PID controllers also have the characteristics of precise control
and high stability. PWM controllers are highly sensitive to signal switching frequency and duty cycle, and can accurately control the average output level.
But it does not have adaptive capability and cannot dynamically adjust control parameters according to the actual situation of the system. Therefore,
there may be certain limitations in some applications that require high control accuracy.
5. Conclusion
In summary, there are significant differences between PID controllers and PWM controllers in terms of principles, applications, and control characteristics.
The PID controller is based on the principle of error feedback regulation and has the characteristics of adaptive ability, precise control, and high stability. It
is suitable for application scenarios that require precise control and stability. The PWM controller controls the average level of the output signal by changing
the width of the pulse, which has the advantages of simplicity, intuitiveness, ease of implementation, and low cost, and is suitable for some application scenarios
that do not require high control accuracy. When choosing which controller to use, it is necessary to comprehensively consider the specific application requirements and control objectives.
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