Woodward 9904-254 |CPU Module, Origin: United States
1.9904-254 Product Overview
The Woodward 9904-254 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.
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2. 9904-254 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 9904-254 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.
A driver or amplifier is used to convert control signals (usually speed or torque signals) from a motion controller into higher power current or voltage signals.
More advanced intelligent drives can close their own position and speed loops to achieve more precise control.
An actuator such as a hydraulic pump, cylinder, linear actuator, or motor is used to output motion.
A feedback sensor such as a photoelectric encoder, rotary transformer, or Hall effect device is used to provide feedback on the position of the actuator to the position controller,
in order to achieve closure of the position control loop.
Numerous mechanical components are used to convert the motion form of the actuator into the desired motion form, including gearboxes, shafts, ball screws,
toothed belts, couplings, and linear and rotary bearings.
Typically, the functions of a motion control system include:
speed control
Point to point control. There are many methods to calculate a motion trajectory, usually based on a velocity curve such as a triangular velocity curve, trapezoidal velocity curve, or S-shaped velocity curve.
Electronic gear (or electronic cam). That is to say, the position of the driven shaft mechanically follows the position change of an active shaft. A simple example is that
a system consists of two turntables that rotate according to a given relative angular relationship. Electronic cam is more complex than electronic gear, as it makes the
following relationship curve between the driving shaft and the driven shaft a function. This curve can be non-linear, but it must be a functional relationship.
Selection of motion controller
1. Determine the type of servo motor based on the working characteristics of the equipment to be developed.
2. Determine the number of motor shafts to be controlled and the operating mode of the motor.
3. Determine the position detection and feedback mode, and choose whether to use a photoelectric encoder, grating ruler, or magnetic grating ruler.
4. Determine the number of input and output switch quantities.
5. Based on the above content, choose a suitable motion controller
Click to learn more about Woodward”s products
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