Woodward 9905-964 |CPU Module, Origin: United States
1.9905-964 Product Overview
The Woodward 9905-964 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. 9905-964 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 9905-964 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.
4、 Application scenarios
Half bridge driver:
Suitable for application scenarios that are cost sensitive and do not require particularly high control accuracy. For example, it is widely used
in some basic motor control, power conversion and other occasions.
Full bridge driver:
Suitable for application scenarios that require high control accuracy and performance. For example, it is widely used in fields such as
electric vehicles, robotics technology, and industrial automation. These fields typically require precise control of parameters such as
motor steering, speed, and position to achieve efficient and stable operation.
V. Summary
There are significant differences between half bridge drivers and full bridge drivers in terms of structure, working principle, performance
characteristics, and application scenarios. The choice of which driving method to use needs to be balanced based on the specific requirements
of the application scenario. For example, in situations where cost is sensitive and control accuracy is not particularly high, half bridge drivers can
be chosen; In situations where high control accuracy and performance are required and cost is not the main consideration, it is more suitable to choose a full bridge driver.
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