Product Description: Woodward 5461-776 Digital Microprocessor Controller

Product Model: 5461-776

Brand: Woodward

Product Series: 505 Series Digital Speed Controller

I. Product Overview

The Woodward 5461-776 is a high-performance, single/double actuator microprocessor speed control controller specifically designed for steam turbines. It is a specialized enhanced version of the 505 series and its core function is to precisely control the speed and load of steam turbines, widely used in steam power systems such as power generation, cogeneration, and industrial drives.

Core Functions: Steam turbine speed control, load regulation, overspeed protection, electro-hydraulic drive

Specialized Fields: Industrial steam turbines, power generation steam turbines, extraction steam turbines, drive steam turbines

Product Form: Modular controller, standard 19-inch cabinet installation 

II. Core Technical Parameters

1. Electrical Specifications

Power Supply: 24 VDC (18–32 VDC)

Control Output:

Low Current PWM Output (Direct Drive for Electro-hydraulic Converter I/H)

Dual-Channel Actuator Drive Output (Supports Single/Double Actuator Configuration)

Multi-Channel Relay Output (Alarm, Shutdown, Status Indication)

Analog Output (4–20 mA / 0–10 VDC)

Output Accuracy: ≤ ±0.25% F.S.

Signal Input:

Speed Feedback: Dual MPU Electromagnetic Sensors (Redundant)

Analog: 4–20 mA / 1–5 VDC (Remote Speed / Load Setting)

Switching: Start, Shutdown, Reset, Run Allowance, Lock / Trip

Auxiliary Input: Valve Position Feedback, Pressure, Temperature, etc. Process Signals

Communication Interface: Independent RS-232 & RS-422 Serial Ports

Electrical Isolation: Input / Output / Power Three-Port Full Isolation

Safety Certification: Class I, Div 2 Explosion-proof Certification, SIL2 Safety Integrity Level

2. Mechanical and Environmental

Operating Temperature: -40°C ～ +85°C

Protection Grade: IP65

Installation Method: Standard 19-inch Rack / Rail Installation

Anti-Vibration / Impact: Complies with MIL-STD-810F Military-level Anti-Vibration

Weight: Approximately 1.0 kg

3. Control Performance

Control Modes:

Speed Control (Speed Control): Single Unit / Parallel Unit Speed Regulation

Load Control (Load Control): Grid Connected / Island Load Regulation

Extraction Control (Extraction Control): Dedicated for Extraction-Type Steam Turbines

Critical Speed Automatic Crossing (Crossover Speed Control)

Speed Regulation Accuracy: ≤ ±0.01%

Regulation Algorithm: Adaptive PID + Feedforward Control + Dynamic Limiter

Protection Functions:

Over-speed / Under-speed, Over-speed Protection (103%/110% Double-Level Protection)

Low Vacuum, Low Oil Pressure, High Exhaust Temperature, Shaft Vibration Protection

Sensor Fault, Actuator Fault, Communication Fault Diagnosis

Power Overvoltage, Undervoltage, Reverse Connection Protection

III. Main Functional Characteristics

Special Control for Steam Turbines

Designed specifically for single/double actuator steam turbines, supporting various models such as pure condensing, back pressure, and extraction.

Built-in Electro-hydraulic Converter (I/H) Drive Logic, directly controlling the main steam valve / regulating valve opening.

Precise Critical Speed Automatic Crossing, protecting the turbine rotor safety.

Dual Mode Operation

Programming Mode (Programming Mode): Used for configuring controller parameters and setting control logic.

Operating Mode (Operating Mode): Automatically executes speed regulation, load, and protection control according to preset programs.

Highly Reliable Safety Design

SIL2 Safety Level Certification, Hardware-level Fault Safety (Failsafe) Mechanism.

Dual MPU Speed Signal Redundancy, ensuring reliable speed feedback.

-40°C ~ +85°C Ultra-Wide Temperature, IP65 High Protection, Full Isolation Anti-Interference.

Flexible System Integration

Standard RS-232/RS-422 Interface, supporting Modbus Communication Protocol.

Compatible with Woodward's Full Series Electro-hydraulic Actuators, Servo Valves, Electro-hydraulic Converters.

Supports Remote Programming, Monitoring, Fault Diagnosis, Data Recording.

IV. Typical Application Scenarios

Industrial Steam Turbines: Power Generation, Combined Heat and Power, Central Heating

Drive Steam Turbines: Compressors, Pump Sets, Fans, Coal Mills Reheat turbine: Process steam + power generation combined cycle

Waste incineration / biomass power generation: Waste heat boiler steam turbine control

Ships / offshore platforms: Steam power system, steam turbine generator set

V. Product Advantages

Highly specialized: Dedicated to steam turbines, perfectly compatible with single/double actuators, reheat / back-pressure models

High safety level: SIL2 certification, dual redundant signals, multi-level safety protection

Precise control: 0.01% speed regulation accuracy, stable control of speed and load

Excellent reliability: wide temperature range, high protection, full isolation, long-life industrial-grade design

Easy maintenance: local panel operation + remote software debugging, convenient parameter configuration

VI. Model Code Interpretation

5461: Woodward industrial control module series number

776: Hardware configuration code (505 steam turbine dedicated controller, dual actuator drive, SIL2, RS-232/422 communication, 24VDC, wide temperature range, IP65, explosion-proof)

VII. Standard Accessories

Speed sensor: dual-channel MPU electromagnetic speed probe

Actuator: Woodward electro-hydraulic converter (I/H), servo valve, linear actuator

Connection cable: shielded signal cable, communication cable

Software tools: Woodward ToolKit configuration and debugging software