Woodward 9903-303 | Governor | Controller | Potential Converter
1.9903-303 Product Overview
The Woodward 9903-303 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. 9903-303 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 9903-303 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 stepper motor driver is specifically designed to drive stepper motors, and stepper motors cannot be directly connected to DC or AC
power sources for operation. The controller sends the step pulse and direction signal to the stepper motor driver, which converts the step
pulse signal into the power signal required to excite the stepper motor. Stepper motor drivers usually have subdivision functions, which can
subdivide the step angle and current, achieving more precise control and lower noise and vibration.
A servo motor driver is a controller used to drive and control servo motors, and is a part of a servo system. The servo motor driver receives
command signals from the control system and transmits current to the servo motor to generate motion proportional to the command signals.
Servo motor drivers typically control parameters such as position, speed, and torque of servo motors to achieve high-precision positioning of
transmission systems. By attaching sensors to the servo motor, the driver can provide feedback on the actual state of the
motor to the control system, compare the commanded state, and correct deviations. In practical applications, servo motor drivers and servo
motors are often used as a whole.
In summary, drivers are classified according to different types and application scenarios of motors, including brushed motor drivers, brushless
motor drivers, stepper motor drivers, and servo motor drivers. They play important roles in their respective fields, driving the continuous
development of motor technology.
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