Woodward 9907-955 505 Turbine Control | 100% Original
1.9907-955 Product Overview
The Woodward 9907-955 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. 9907-955 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 9907-955 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.
control performance
Vector controllers have good control performance in motor starting, stopping, acceleration and deceleration. Due to its ability to
control motor torque and speed with high precision, it has higher control accuracy and is suitable for high-precision control fields.
In addition, vector control can achieve smooth and precise operation control, improving the efficiency of motor operation.
Application scenarios
Vector controllers are widely used in high-performance motor applications, such as industrial automation, precision machinery,
aerospace, and other fields. In these fields, the control accuracy and performance requirements for motors are high, and vector controllers can meet these needs.
3、 Overview of Sine Wave Controller
working principle
The sine wave controller controls the motor by directly controlling the three-phase sine wave signal. Its working principle is based on
the sine function in mathematics, which controls the generated sine wave signal by adjusting amplitude, frequency, and phase parameters.
The sine wave controller represents the three-phase output current and voltage as vectors during the control process, thereby achieving control of the motor.
control performance
Compared to vector controllers, sine wave controllers have relatively lower control performance. Due to the limitations of the control algorithm,
it cannot achieve the control accuracy of a vector controller. Especially in complex operating conditions, the performance of sine wave controllers
is relatively limited. However, sine wave controllers have the advantages of simple structure and low cost, making them suitable for situations where control accuracy is not required.
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