Woodward 9904-002 505 Turbine Control | 100% Original
1.9904-002 Product Overview
The Woodward 9904-002 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. 9904-002 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 9904-002 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.
Composition of DMA Controller
A DMA controller is actually an interface circuit between peripheral devices using DMA and the system bus. This interface circuit is composed of
an interrupt interface and a DMA mechanism. Traditionally, DMA interface circuits are referred to as DMA controllers.
Composition of DMA Controller
(1) Memory address counter: used to store the address of data to be exchanged in memory. Before DMA transfer, the starting position (first address)
of data in memory must be sent to the memory address counter through a program. When DMA transfers, for each data exchange, the address counter is
incremented by “1” to incrementally provide the address of the batch of data to be exchanged in memory.
(2) Word counter: used to record the length (number of words) of the transmitted data block. Its content is also pre-set by the program before data transmission,
and the number of exchanged words is usually represented in the form of complement codes. During DMA
transfer, the word counter increments by “1” for each word transferred. When the counter overflows and a carry is generated at the highest bit, it indicates
that the batch of data has been transferred, causing the DMA controller to issue an interrupt signal to the CPU.
(3) Data buffer register: used to temporarily store the data (one word) transferred each time. When input, it is sent to the data buffer register by the device
(such as a disk), and then sent to the memory through the data bus by the buffer register. On the contrary, when outputting, it is sent from memory to the data
buffer register through the data bus, and then to the device.
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