Introduction
The Woodward LR20025 Multifunction Relay is a versatile protection and control relay engineered to provide reliable monitoring, fault detection, and operational output functions in industrial systems — particularly in wind turbine and power generation applications. Built to deliver precise electrical sensing and robust relay outputs, it supports integration with higher‑level PLCs and control architectures, offering flexibility and dependable performance in challenging environments.
Designed as a modern solution and often used as a replacement for legacy models such as the MFR300, the LR20025 combines multiple sensing and control capabilities in one compact module, reducing the need for separate devices and simplifying system wiring. Its comprehensive feature set makes it well‑suited for demanding renewable energy systems and other automation applications where accurate monitoring and responsive control are essential.
Technical Specifications
| Specification | Details |
|---|
| Model | LR20025 |
| Manufacturer | Woodward |
| Product Type | Multifunction Relay |
| Typical Application | Wind turbine control and monitoring |
| Voltage Sensing | 250–690 VAC, 50/60 Hz |
| Current Sensing | 0.5–5 A |
| Accuracy | Class 1 precision |
| Discrete I/O | 1 discrete input, 8 discrete outputs |
| Communication | CAN bus (upper‑level PLC integration) |
| Display | 2‑line numeric display |
| Power Supply | 24 V DC (nominal application systems) |
| Mounting | Panel or DIN‑rail mounting |
| Environmental Rating | IP20 enclosure |
| Operating Temp. | –40 °C to +70 °C |
| Dimensions | Approx. 96 × 72 × 130 mm |
| Weight | ~0.91 kg |
| Warranty | Typically 12 months |
Applications
Wind Turbine Control Systems
Provides essential control and monitoring functions in wind turbines, including voltage and current sensing, fault detection, and operational switching.
Generator Protection and Automation
Monitors electrical parameters and issues relay outputs for protective actions, alarms, or shutdown commands.
PLC‑Integrated Monitoring
Connects seamlessly to higher‑level PLCs via CAN bus for coordinated automation logic and system integration.
Renewable Energy Installations
Used in hybrid power systems and distributed generation architectures requiring advanced monitoring and control functions.
Industrial Control Panels
Installed in control cabinets to centralize sensing and switching tasks, reducing the number of separate components and wiring complexity.
Advantages
Multi‑Function Monitoring
Combines voltage and current sensing with discrete output control in a single compact unit.
CAN Bus Integration
Built‑in communication support enables integration with PLC systems and networked controllers.
High‑Precision Sensing
Class 1 accuracy ensures reliable measurement and consistent performance for control logic and protection.
Rugged Industrial Design
Designed for harsh operating conditions, with a robust enclosure and broad temperature tolerance.
Direct Replacement Compatibility
Often used as a modern replacement for legacy MFR300 models, making upgrades and service easier.
Technical FAQs
1. What type of device is the LR20025?
It is a multifunction relay used for electrical monitoring and control in industrial systems.
2. What electrical parameters does it monitor?
It senses voltage (250–690 VAC) and current (0.5–5 A) with Class 1 accuracy.
3. What communication interface does it support?
It includes CAN bus communication for integration with PLCs and automation controllers.
4. How many outputs does it provide?
It offers 8 discrete outputs and 1 discrete input for control and monitoring purposes.
5. Where is this relay typically mounted?
Installed in control panels via panel mount or DIN‑rail mounting.
6. What display feature does it have?
It includes a 2‑line numeric display for status and parameter readouts.
7. Is it suitable for harsh environments?
Yes — it is designed for industrial use and can handle wide temperature ranges.
8. What power supply is typically used?
Nominal 24 V DC systems are commonly used in applications with this relay.
9. Can it replace older relay models?
It can often replace legacy Woodward MFR300 relays without needing major system changes.
10. What typical industries use this relay?
Common in renewable energy, power generation, and industrial automation sectors.
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