The Woodward LR20025, also cataloged as the MFR13 Multifunction Relay, operates as a dedicated hardware component for wind turbine electrical sensing and control execution within turbine PLC communication networks.

Hardware Specifications

Actuator Loop Feedback Response and CAN Bus Integration

The Woodward LR20025 process high-voltage line signals ranging from 250 to 690 VAC alongside current sensing inputs from 0.5 to 5 A to provide deterministic actuator loop feedback response. Interfacing directly with primary wind turbine control PLCs via an integrated CAN bus, the unit delivers real-time power parameters and status monitoring. Closed-loop processing enables rapid tripping and signal exchange to adjust blade pitch, generator engagement, or contactor isolation during line voltage or current anomalies.

Frequently Asked Questions

Q: What are the primary electrical voltage and current sensing capabilities of the Woodward LR20025?

A: The relay supports direct AC voltage sensing from 250 to 690 VAC (50/60 Hz) and current sensing levels between 0.5 and 5 A.

Q: How does the Woodward LR20025 communicate with the main controller?

A: The unit utilizes a built-in CAN bus protocol interface to transfer electrical parameters and alarm telemetry directly to an upstream PLC.

Q: What is the designated functional replacement part for the LR20025 MFR13 relay?

A: The unit can be functionally replaced by the Woodward MFR300 module under part number 8444-1093.

Field Installation Guidelines

• Mount the relay within a shielded control cabinet to ensure mechanical stability and protection from industrial contamination.
• Route high-voltage AC voltage sensing wires (up to 690 VAC) in separate conduits from low-voltage CAN bus communication cables to prevent noise induction.
• Ensure proper cable shielding on all CAN bus network lines, grounding the shield at a single point to prevent ground loops.
• Verify current transformer (CT) secondary wiring polarities and ensure current sensing loops do not exceed the specified 0.5 to 5 A limits prior to powering the system.