Woodward 5461-798 |CPU Module, Origin: United States
1.5461-798 Product Overview
The Woodward 5461-798 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. 5461-798 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 5461-798 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.
5. Low cost and strong anti-interference ability.
The remote control consists of an infrared receiver and transmitter circuit, a signal conditioning circuit, a central controller 8031,
a program and data memory, a keyboard, and a status indicator circuit.
The remote control has two states: learning state and control state. When the remote control is in learning mode, every time the
user presses a control button, the infrared receiving circuit begins to receive external infrared signals and convert them into electrical signals.
Then, after detection, shaping, and amplification, the CPU samples them at regular intervals. The binary data of each sampling point is stored
in designated storage units in 8-bit units for future control of the device. When the remote control is in control mode, every time the user presses
a control key, the CPU reads
a series of binary data from the designated storage unit and outputs it in series (the time interval between bits is equal to the time interval during
sampling) to the signal holding circuit. At the same time, the modulation circuit modulates the signal, amplifies the modulated signal, and emits
it through an infrared emitting diode, thereby achieving control of the device function corresponding to the key.
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