Woodward 5501-424D |CPU Module, Origin: United States
1.5501-424D Product Overview
The Woodward 5501-424D 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. 5501-424D 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 5501-424D 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.
3/4. Input and output ports
The third and fourth of the five elements are input and output (I/O), respectively. I/O is a channel for exchanging data and signals
between external devices and microcontrollers. In microcontroller design, dedicated peripheral circuits for external devices are
required to perform data input, output, and communication. The basic operations corresponding to input and output include CPU
read and write. Input/output is called a port, and its address is called a port address. According to the different data and signal exchange
functions with external devices, it needs to be divided into input ports and output ports.
5. Bus
CPU、 The memory and I/O functions constitute the basic internal functional units of a microcontroller, but only by connecting the CPU, memory,
and I/O through wiring so that signals can flow through each unit, can the control of the microcontroller be achieved. Therefore, the fifth element
of the microcontroller is the bus. The following figure is an example of a microcontroller signal flow. The various functions of the microcontroller are connected by multiple signal lines, which are called buses.
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