Woodward 9905-211 Price Discount | In Stock
1.9905-211 Product Overview
The Woodward 9905-211 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. 9905-211 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 9905-211 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.
Input level
The input stage is responsible for receiving external control signals and converting them into signals suitable for internal circuit processing.
####2.2 Driver level
The driver stage is the core part of the gate driver chip, responsible for generating gate voltage and gate current. It usually includes one or more power amplifiers.
####2.3 Protection Circuit
The protective circuit is used to monitor the working status of the chip and provide protective measures in case of abnormal situations.
####2.4 Output Stage
The output stage is responsible for transmitting the gate voltage and current generated by the driver stage to the power electronic devices.
### 3. The function of gate driver chip
The main functions of gate driver chips include:
####3.1 Quick switch
The gate driver chip needs to be able to quickly switch power electronic devices from a conducting state to a cutoff state, or from a cutoff state to a conducting state.
####3.2 Precise Control
The gate driver chip needs to be able to accurately control the gate voltage and gate current to achieve stable operation of the device.
There are no reviews yet.