Product Description
The WOODWARD 8237-1369 is a ProTech-GII overspeed protection system designed to protect steam turbines, gas turbines, hydro turbines, and other high-speed rotating machinery.
It uses a Triple Modular Redundant (TMR) architecture with three independent speed-monitoring channels and 2-out-of-3 voting logic. This arrangement improves protection reliability by allowing the system to identify abnormal speed conditions while reducing the risk of a single-channel failure causing an incorrect trip decision.
The 8237-1369 is a panel-mounted configuration featuring high-voltage/low-voltage power supply options and voted trip relays. It is designed for critical turbine safety applications requiring fast overspeed detection, independent monitoring, alarm reporting, and reliable shutdown control.
The system is suitable for turbine protection, compressor protection, generator-drive applications, and industrial rotating equipment.
⚙️ Product Datasheet and Parameters
Brand: WOODWARD
Model: 8237-1369
Series: ProTech-GII
Product Name: Turbine Overspeed Protection System
Product Type: Triple Modular Redundant Safety Protection Controller
Configuration: Panel Mount, HV/LV, Voted Relays
Protection Architecture: Triple Modular Redundant (TMR)
Voting Logic: 2-out-of-3
Speed Inputs: 3 independent speed sensor inputs
Sensor Type: Magnetic Pickup (MPU) or compatible proximity sensor
Speed Measurement Range: 0.5–32,000 RPM
Response Time: Approximately 12 ms
Relay Outputs: Voted trip relays and independent alarm relays
Analog Outputs: 3 independent speed outputs
Communication: Modbus interface
Power Supply: High Voltage and Low Voltage input configuration; verify exact supply ratings against the nameplate
Safety Certification: IEC 61508 SIL 3
Mounting Type: Panel Mount
Place of Manufacture: Woodward manufacturing facilities
Country of Origin: United States; verify individual unit nameplate
Dimensions: Refer to Woodward Manual 26545
Weight: Verify the actual unit and shipping configuration
Product Status: Industrial turbine safety equipment; supplied condition must be confirmed
Discontinued: Original model number has preferred successor configurations; confirm current availability with Woodward
🔧 Daily Maintenance and Care
- Inspect the enclosure, mounting points, and terminal connections for physical damage.
- Check all three speed sensor channels for stable signal detection.
- Inspect magnetic pickup cables and connectors for wear and interference.
- Verify power supply status for all three protection modules.
- Check trip relay and alarm relay status indicators.
- Inspect grounding, shielding, and electrical connections.
- Review event logs, alarm history, and overspeed detection records.
- Check communication interfaces and Modbus data availability.
- Verify that configuration parameters and trip settings match approved turbine protection documents.
- Perform scheduled proof testing according to Woodward instructions and the site’s safety management procedures.
🛠️ Troubleshooting and Common Issues
Speed Sensor Signal Failure
Inspect MPU wiring, sensor clearance, signal amplitude, connectors, and individual channel diagnostics.
Overspeed Alarm
Compare actual turbine speed with configured trip settings. Inspect sensor signals and verify the turbine operating condition.
Voting Logic Alarm
Check all three protection channels, module status, and channel-to-channel discrepancies.
Trip Relay Failure
Inspect relay contacts, external wiring, trip circuit power, and relay diagnostic indicators.
Power Supply Alarm
Check the high-voltage and low-voltage input supplies, fuses, terminals, and power module status.
Communication Failure
Inspect Modbus wiring, communication settings, network connections, and controller configuration.
False Overspeed Detection
Check electromagnetic interference, speed sensor wiring, grounding, sensor mounting, and signal quality.
Module Fault
Review module diagnostics, internal fault indications, and event logs. Follow the approved module replacement procedure.
🛡️ Safety Precautions
- Isolate electrical power before performing internal maintenance.
- Follow electrostatic discharge protection procedures when handling electronic modules.
- Never bypass or disable turbine overspeed protection during normal operation.
- Do not change trip thresholds without an approved engineering review.
- Verify all three speed channels before returning the system to service.
- Test trip relays and shutdown circuits using approved proof-test procedures.
- Confirm power supply ratings and wiring against the actual hardware configuration.
- Ensure the external emergency shutdown system remains functional.
- Use qualified turbine safety engineers for commissioning and maintenance.
- Record all configuration changes and proof-test results.
⭐ Recommended WOODWARD Models
- 8237-1367 – ProTech-GII Panel Mount, Independent Relays
- 8237-1368 – ProTech-GII Panel Mount, HV/HV, Independent Relays
- 8237-1370 – ProTech-GII Panel Mount, HV/HV, Voted Relays
- 8237-1244 – ProTech-GII Bulkhead Mount, HV/LV
- 8237-1245 – ProTech-GII Bulkhead Mount, HV/HV
- 8237-1246 – ProTech-GII Bulkhead Mount, HV/LV, Voted Relays
- 8237-1247 – ProTech-GII Bulkhead Mount, HV/HV, Voted Relays
- 8237-1600 – ProTech-GII Panel Mount, HV/LV, Voted Relays
- 8237-1598 – ProTech-GII Panel Mount, HV/LV, Independent Relays
- 8237-1599 – ProTech-GII Panel Mount, HV/HV, Independent Relays
- 8237-1601 – ProTech-GII Panel Mount, HV/HV, Voted Relays
- 5437-1119 – ProTech-GII Spare Module
- 5437-1120 – ProTech-GII Spare Module
- 5437-1121 – ProTech-GII Spare Module
- 8200-1302 – ProTech-GII Turbine Protection System Component
Note: The recommended models include related ProTech-GII configurations and spare modules. They are not all direct replacements. In particular, 8237-1600 is the preferred successor configuration for 8237-1369. Verify hardware revision, power supply configuration, relay arrangement, and compatibility before ordering.
