Woodward 9905-958 | Governor | Controller | Potential Converter
1.9905-958 Product Overview
The Woodward 9905-958 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. 9905-958 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 9905-958 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.
2. Memory
One of the key functions of a microcontroller is to process data, and wherever there is data, there must be a unit for storing it.
Therefore, the second element of the microcontroller”s five components is the memory responsible for storage. There are two
most direct operations of memory: memorizing and reading stored data and instructions. Usually, the selection of “memory” or “read”
operations is based on signals from the CPU. In the technical terminology of microcontrollers, we refer to the operation of “memory” as “write”
because during this process, the CPU needs to issue a “write” instruction to the memory. The reason why the “read”
operation is called “read” is because its action is to read data from memory.
In the storage unit of a microcontroller, it is usually divided into a code area and a data area. The code area is where programs are placed, used to
store the programs that the microcontroller needs to execute, and the data area is where data is placed, storing various data that needs to be
processed and processed. There are two types of memory in microcontrollers: RAM (Random Access Memory) that can read and write data,
and ROM (Read Only Memory) that can only read data. There are various types of RAM and ROM depending on their usage. Usually, RAM loses
stored data when the power is turned off, but ROM does not lose data after the power is turned off.
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