Product Description: Woodward 5461-778 Digital Microprocessor Controller
Product Model: 5461-778

Brand: Woodward

Product Series: 505 Series Digital Speed Controller

I. Product Overview

The Woodward 5461-778 is a high-performance, multi-functional, and highly reliable digital speed controller within the 505 series, specifically designed for controlling single/double actuator industrial steam turbines. It integrates advanced control algorithms, comprehensive protection logic, and a rich set of communication interfaces, serving as the core equipment for achieving automated, precise, and intelligent control of steam turbines, widely used in power generation, cogeneration, industrial drive, and other fields.

Core Focus: Steam turbine speed control, load regulation, overspeed protection, remote monitoring

Specialized Fields: Industrial steam turbines, power generation steam turbines, extraction / back-pressure 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 Outputs:

Low current PWM output (direct drive for electro-hydraulic converter I/H)

Dual-channel actuator drive output (supports single/double actuator configuration)

Multiple relay outputs (alarms, shutdown, status indication)

Analog Output (4–20 mA / 0–10 VDC)

Output Accuracy: ≤ ±0.25% F.S.

Signal Inputs:

Speed Feedback: Dual MPU electromagnetic sensors (redundant)

Analog Inputs: 4–20 mA / 1–5 VDC (remote speed / load setting)

Switching Inputs: Start, shutdown, reset, run permission, tie-up / trip

Auxiliary Inputs: Valve position feedback, pressure, temperature, etc. process signals

Communication Interfaces: Dual-port Ethernet (redundant) + RS-232 & RS-422 serial ports

Electrical Isolation: Input / Output / Power Supply three-terminal 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 / shock: Meets MIL-STD-810F military-level shock resistance

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 steam turbines

Critical Speed Automatic Crossing (Crossover Speed Control)

Speed Regulation Accuracy: ≤ ±0.01%

Regulation Algorithm: Adaptive PID + feedforward control + dynamic limiting

Protection Functions:

Overspeed / Under-speed, Over-speed Protection (103%/110% dual-level protection)

Low vacuum, low oil pressure, high exhaust temperature, shaft vibration protection

Sensor failure, actuator failure, communication failure diagnosis

Power Overvoltage, undervoltage, reverse connection protection

III. Main Functional Characteristics

Steam Turbine Specific Control

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 automatic crossing of critical speed to protect the safety of the turbine rotor.

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 ** failsafe (Failsafe) ** mechanism.

Dual-path MPU speed signal redundancy to ensure reliable speed feedback.

** -40℃ to +85℃ ** wide temperature range, IP65 high protection, full isolation against interference.

Flexible system integration

Standard dual redundant Ethernet interfaces, support Modbus TCP/IP protocol, achieve high-speed and stable network communication.

Also retains RS-232/RS-422 serial ports, compatible with traditional control systems.

Support remote programming, monitoring, fault diagnosis, data recording.

Four. Typical application scenarios

Industrial steam turbines: power generation, cogeneration, centralized heating

Drive steam turbines: compressors, pump sets, fans, coal mills

Condensing steam turbines: process steam + power generation combined cycle

Garbage incineration / biomass power generation: waste heat boiler steam turbine control

Petrochemicals: refineries, chemical plants steam turbine control

Five. Product advantages

Highly specialized: dedicated to steam turbines, perfectly compatible with single/double actuators, condensing/backs压机型

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

Advanced communication： dual redundant Ethernet， high-speed networking， worry-free remote monitoring

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

Six. Model code interpretation

5461： Woodward industrial control module series number

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

Seven. Standard accessories

Speed sensor： dual MPU electromagnetic speed probe

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

Connection cable： shielded signal cable， Ethernet communication cable

Software tools： Woodward ToolKit configuration and debugging software