Woodward 9905-797 |CPU Module, Origin: United States
1.9905-797 Product Overview
The Woodward 9905-797 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. 9905-797 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 9905-797 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.
What is a driver
What is a driver
Drivers, also known as driver programs or driver software, are software used in computer systems to control and manage hardware devices.
It serves as a bridge between the operating system and hardware devices, responsible for converting operating system instructions into signals
that hardware devices can understand and execute. Drivers are crucial for the stable operation and performance of computer systems.
This article will provide a detailed introduction to the concept, classification, working principle, installation and update, fault diagnosis and troubleshooting of drivers.
1、 The concept of a driver
A driver is a special software that is responsible for communication and data transfer between the operating system and hardware devices.
The main task of a driver is to convert abstract commands of the operating system into specific instructions that hardware devices can recognize
and execute. In this way, the operating system can control and manage various hardware devices through drivers without worrying about the specific implementation details of the hardware devices.
2、 Classification of Drivers
According to the type and function of hardware devices, drivers can be divided into the following categories:
1. Display driver: responsible for controlling and managing the drivers of display devices such as monitors and graphics cards.
2. Audio driver: responsible for controlling and managing drivers for audio devices such as sound cards and speakers.
3. Network driver: responsible for controlling and managing the drivers of network interface cards, wireless network cards, and other network devices.
4. Storage drives: responsible for controlling and managing the drives of storage devices such as hard drives, solid-state drives, and USB drives.
5. Input device driver: responsible for controlling and managing drivers for human-computer interaction devices such as keyboards, mice, touch screens, etc.
6. Output Device Drivers: Responsible for controlling and managing drivers for output devices such as printers and scanners.
7. USB Drive: Responsible for controlling and managing the USB interface and the drivers of the devices connected to it.
8. Other drivers: such as Bluetooth drivers, infrared drivers, etc.
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