WOODWARD 5437-1067A Reliability Independent Module
The Woodward 5437-1067A is a high-reliability individual module for the ProTech-GII series.
It is a critical component of Woodward’s Safety Integrity Level 3 (SIL-3) overspeed protection system, specifically designed to monitor and protect steam, gas, and hydro turbines from catastrophic overspeed or over-acceleration events.
Technical Parameter Table
| Parameter | Specification |
| Model Number | 5437-1067A |
| Series | ProTech-GII |
| Device Type | Individual Safety Module (for TMR architectures) |
| Voltage Input | High Voltage/Low Voltage (HV/LV) Voted |
| Response Time | 8 to 26 milliseconds (Total system response) |
| Speed Input Type | Active or Passive Magnetic Pickups (MPU) / Proximity |
| Speed Range | 0.5 to 32,000 RPM |
| Enclosure Rating | IP56 (Dust and Water Protected) |
| Communications | Modbus RS-485 / PCT Service Tool Interface |
| Safety Certification | IEC 61508 SIL-3 Certified |
Related Models
The 5437-1067A is typically part of a triple-modular redundant (TMR) system:
8237-1246 / 8237-1369: The main bulkhead or panel-mount assemblies this module fits into.
5437-1078 / 5437-1119: Alternate spare modules with different relay or voltage configurations.
9927-1180: ProTech-GII Service Tool (software for configuration).
Application Cases
Nuclear & Fossil Power Plants: Used as the primary safety barrier for large-scale steam turbines to prevent runaway scenarios.
Mechanical Drive Turbines: Protecting turbines that drive compressors in oil refineries and gas processing plants.
Hydroelectric Dams: Managing the synchronization and emergency shutdown of water turbines.
Marine Propulsion: Installed on naval and commercial vessels to ensure engine safety in high-vibration maritime environments.
5437-1067A
Product Advantages and Features
Triple Modular Redundancy (TMR): Operates in a 2-out-of-3 (2oo3) voting logic. This ensures that a single module failure will not cause a nuisance trip or a failure to trip.
On-Line Repair: The modular design allows a single module (like the 5437-1067A) to be replaced while the turbine is running, significantly reducing plant downtime.
Acceleration Protection: Unlike basic overspeed trips, it calculates the rate of speed change (acceleration) to predict and prevent overspeed before it happens.
Integrated Logging: Maintains internal logs for the last 50 trips/alarms and 20 overspeed events with high-resolution timestamps.
Ruggedized Construction: Features sulfur-resistant conformal coating, making it suitable for Class 3C2 corrosive environments.
5437-1067A
Other Models in the Same Series
The ProTech-GII family is distinguished by its mounting and output types:
Bulkhead Mount Series: Designed for wall or skid mounting (e.g., 8237-1246).
Panel Mount Series: Designed for flush-mounting within a control cabinet (e.g., 8237-1600).
Voted Relay vs. Independent Relay: Depending on the model, the relays are either pre-voted internally or output independently to an external safety PLC.
English Introduction
The Woodward 5437-1067A is a specialized module for the ProTech-GII overspeed safety system.
It serves as a high-precision, microprocessor-based monitor that interfaces directly with magnetic speed sensors.
By utilizing 2-out-of-3 voting, the 5437-1067A provides the highest level of system availability and reliability, meeting global SIL-3 safety standards.
Its ability to be “hot-swapped” during operation and its advanced diagnostics make it a gold standard for protecting multi-million dollar rotating assets in the energy and processing industries