Woodward 9906-707 505 Turbine Control | 100% Original
1.9906-707 Product Overview
The Woodward 9906-707 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. 9906-707 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 9906-707 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.
Basic Introduction to Servo Drivers
Servo drives, also known as “servo controllers” or “servo amplifiers”, are a type of controller used to control servo motors.
Their function is similar to that of a frequency converter acting on a regular AC motor, and they are part of a servo system.
They are mainly used in high-precision positioning systems. Generally, servo motors are controlled through three methods: position,
speed, and torque to achieve high-precision positioning of the transmission system. Currently, it is a high-end product in transmission technology.
Basic Introduction
Servo drives are an important component of modern motion control and are widely used in automation equipment such as industrial robots and
CNC machining centers. Especially for servo drives used to control AC permanent magnet synchronous motors, they have become a research
hotspot both domestically and internationally. The current design of communication servo drives commonly adopts a current, velocity, and position
closed-loop control algorithm based on vector control. The rationality of the speed closed-loop design in this algorithm plays a crucial role in the performance
of the entire servo control system, especially in terms of speed control.
The real-time speed measurement accuracy of the motor rotor is crucial for improving the dynamic and static characteristics of the speed control in the servo drive speed loop.
To seek a balance between measurement accuracy and system cost, incremental photoelectric encoders are generally used as speed sensors,
and the corresponding commonly used speed measurement method is the M/T speed measurement method. Although the M/T speed measurement
method has a certain measurement accuracy and a wide measurement range, it has inherent defects, mainly including:
1) At least one complete code wheel pulse must be detected during the speed measurement cycle, which limits the minimum measurable speed;
2) The timer switches of the two control systems used for speed measurement are difficult to strictly maintain synchronization, and the accuracy of speed
measurement cannot be guaranteed in measurement scenarios with large speed changes. Therefore, the traditional speed loop design scheme using
this speed measurement method is difficult to improve the speed tracking and control performance of servo drives
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