Woodward 5437-1124 ProTech-GII Overspeed Protection Module

Product Overview

The 5437-1124 overspeed protection module is a critical safety component developed by Woodward for the ProTech-GII turbine protection platform. It is engineered to continuously supervise shaft speed and acceleration on high-energy rotating equipment and to trigger an immediate shutdown when unsafe operating limits are exceeded.

Designed as a plug-in, field-replaceable unit, this module forms part of a triple-redundant architecture that minimizes nuisance trips while maintaining strict compliance with turbine safety integrity requirements. The design is widely deployed in power generation and heavy industrial turbine installations where failure prevention is mandatory.

Core Functions and Capabilities

The 5437-1124 module provides deterministic overspeed detection using configurable trip algorithms and redundant logic paths. When installed in a ProTech-GII chassis, it participates in a 2-out-of-3 voting scheme, allowing a shutdown decision only when two independent channels confirm an unsafe condition.

Key functional characteristics include continuous speed validation, fault diagnostics, and non-volatile event storage. The module supports multiple speed sensing technologies, enabling compatibility with both legacy and modern turbine instrumentation.

Technical Specifications

General

• Manufacturer: Woodward
• Product Family: ProTech-GII
• Module Type: Overspeed / Over-acceleration Protection
• Country of Manufacture: United States
• Installation: ProTech-GII rack-mounted, hot-swappable design

Electrical Characteristics

• Supply Voltage: 24 VDC nominal
• Operating Range: 18 to 32 VDC
• Power Consumption: Low-power safety module design
• Isolation: Internal galvanic isolation between inputs and logic circuits

Speed Input Interfaces

• Magnetic Pickup (MPU) sensors
• Proximity probes with speed signal conditioning
• Redundant input validation and signal plausibility checks

Protection Logic

• User-configurable overspeed setpoints
• Independent acceleration monitoring
• 2oo3 voting when used in triple-module configurations
• Fail-safe behavior on internal diagnostics failure

Communication and Outputs

• System Communication: ProTech-GII internal safety bus
• External Integration: Modbus TCP/RTU via system interface modules
• Discrete trip outputs through system-level safety relays
• Event and alarm data accessible from DCS or asset management systems

Environmental Ratings

• Operating Temperature: –40 °C to +85 °C
• Storage Temperature: –55 °C to +105 °C
• Vibration and Shock: Designed for turbine skid environments
• Enclosure Protection: Determined by ProTech-GII chassis (not IP-rated as a standalone module)

System Compatibility

The 5437-1124 is fully compatible with Woodward ProTech-GII turbine protection systems used on:

• Steam turbines
• Gas turbines
• Hydro turbines
• Mechanical drive turbines in refining and petrochemical plants

It operates independently from the turbine governor, ensuring that overspeed protection remains active even if control functions fail.

Typical Applications

• Utility-scale power generation turbines
• Combined-cycle power plants
• Oil & gas compression trains
• Pipeline pump and compressor drives
• Critical rotating equipment requiring SIL-rated overspeed protection

Frequently Asked Questions

Is the 5437-1124 a standalone controller?
No. This module functions only within a ProTech-GII protection system and cannot operate independently.

Does it replace a governor overspeed function?
No. It provides an independent mechanical safety layer, separate from turbine control or fuel management systems.

Can it be used in SIL-rated architectures?
Yes. When configured in a triple-modular ProTech-GII system, it supports high-integrity safety applications.