Woodward 9905-387 | Governor | Controller | Potential Converter
1.9905-387 Product Overview
The Woodward 9905-387 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. 9905-387 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 9905-387 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.
The connectors on the board are arranged in a standard manner so that shielding can be connected. Shielding is a module with specialized functions
(such as infrared output, Bluetooth, GSM, WIFI, Ethernet, motor on/off control using Relas, stepper motor control). Depending on the type of shield,
multiple shields may be stacked together and addressed separately through the I2C serial bus.
Due to the open-source nature of Arduino code and hardware, third-party developers have already created copies of the official Arduino development board.
The Arduino development board has 32 to 512k of flash memory, which can be used for program storage.
Leonardo – a specific model of Arduino development board. Digital pins can be configured as inputs or outputs. In addition
to standard analog inputs, several digital pins can also serve as analog inputs.
What can Arduino development boards be used for?
Arduino development boards can be used to do many cool things. You can easily add LCD displays, keyboards, or seven segmented display modules
and quickly build a simple system. The Arduino. cc website provides a wealth of information and libraries. You can design your own electronic plugins
or use shielding covers to build modular systems. Arduino, due to its versatility, can be used for simple, mundane tasks or complex applications.
A simple application example is to activate the device when the indoor temperature drops below a certain level. Expanding this application and adding
a GSM module can easily send text messages when such situations occur. Arduino development boards can be used to implement complex home
automation systems that can be controlled through smartphones. Enthusiasts also use them as processing and control devices in robots, and provide
kits for building simple wheeled robots.
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