Woodward ProTech-GII Series 5437-1067A TMR Overspeed Safety Module
Series Core Definition
5437-1067A is a core single-channel safety monitor module under the Woodward ProTech-GII Series triple redundant overspeed protection platform. The ProTech-GII product line is Woodward’s flagship SIL3 safety integrity speed protection system dedicated to gas, steam, hydro turbines and reciprocating compressors, designed to eliminate catastrophic overspeed failure risks via 2-out-of-3 (2oo3) voting TMR architecture.
All hardware in the ProTech-GII family adopts a unified 5437 part number prefix for safety monitoring cards, chassis backplanes, and auxiliary power boards. The 5437-1067A is the independent speed voting safety unit, the key core component of complete ProTech-GII trip protection racks, fully compliant with IEC 61508 SIL3, API 670, and turbine OEM safety standards.
Basic Model Identification
Part No.: 5437-1067A
Affiliated Series: ProTech-GII Overspeed Protection System
Hardware Revision: An upgraded anti-corrosion conformal-coated PCB version
Device Type: TMR single-channel speed monitor voting module
Safety Level: SIL 3 (IEC 61508)
Core Product Overview (5437-1067A)
The Woodward 5437-1067A is a microprocessor-based high-reliability speed detection & voting module built exclusively for ProTech-GII triple redundant safety racks. It receives speed signals from magnetic pickup (MPU) or proximity probes, performs real-time frequency-to-RPM conversion, compares measured speed against configurable overspeed setpoints, and executes safety trip voting logic within microsecond-level response time.
This module forms one of three identical redundant lanes inside a full ProTech-GII TMR cabinet. Three pieces of 5437-1067A work together to implement 2oo3 fault voting: only if at least two channels detect overspeed will the system trigger emergency shutdown (ESD), avoiding single-module false tripping while ensuring zero missed overspeed hazards.
Suffix "A" stands for enhanced industrial hardware revision: polyacrylate sulfur-resistant coating, reinforced anti-vibration PCB fixing, wider operating temperature range, optimized EMI filtering for offshore, refinery, and boiler room harsh environments.
Key Technical Characteristics
Dual Speed Sensor Compatibility
Supports passive MPU (magnetic pickup) and active proximity probe inputs; internal jumper selection for signal impedance matching; covers low-speed startup monitoring down to 0.5Hz.
Ultra-Fast Safety Response
Total system response time 8~26ms, meets turbine overspeed protection strict fast trip requirements to prevent rotor runaway damage.
Configurable Overspeed & Stall Logic
Multi-level speed threshold programming: overspeed trip, overspeed alarm, zero-speed stall protection, critical speed band monitoring via front programmer or Modbus.
Built-In Self-Test (BIST)
Continuous background circuit self-diagnosis for CPU, power supply, sensor circuits, and relay outputs; fault LED indicator on front panel for rapid maintenance.
Industrial Harsh Environment Design
Operating temperature: -40℃ ~ +70℃; anti-sulfur coated circuit board; shock & vibration certified per MIL-STD 810D; salt fog resistance for offshore platforms.
Global Safety Certifications
IEC 61508 SIL 3, Class I Division 2 Groups A/B/C/D, IEC Zone 2, ATEX, DNV & ABS marine approval, compliant with power and oil & gas industry safety codes.
Communication Interface
Onboard RS485 Modbus RTU port for DCS/SCADA remote speed data reading, fault alarm upload, and parameter remote modification.
System Matching Architecture
A complete ProTech-GII TMR overspeed rack requires three sets of 5437-1067A modules plus supporting 5437 series backplane, power unit, and relay output cards:
3 × 5437-1067A (redundant speed voting modules, 3 independent signal lanes)
ProTech-GII dedicated 5437 series rack backplane.
Matching industrial power supply module
Trip relay output boards
Handheld programming unit for parameter calibration
Typical Application Scenarios
Large combined cycle gas turbine overspeed safety protection
Utility steam turbine SIL3 grade trip systems
Hydroelectric turbine speed monitoring & emergency shutdown
Offshore platform gas compressor overspeed protection
Refinery reciprocating prime mover safety control
Waste heat power plant turbine safety interlock
Supporting Official Documentation
ProTech-GII System Hardware Manual
5437-1067A Datasheet
IEC 61508 SIL3 Safety Manual
Turbine Overspeed Protection Application Guide
Aftermarket Support
Woodward Global Service Network provides factory repair, remanufactured spare 5437-1067A units, LTB stock reservation, on-site safety rack commissioning, and SIL safety verification technical service.
