Description
Woodward 8237-1244
Technical Specifications
- Part Number: 8237-1244
- Safety Rating: SIL 3 certified
- Output Type: Form-C relay contacts
- Voting Logic: 2oo3 (Two-out-of-Three)
Functional Features
- Redundant Tripping: Multiple independent relay channels ensure trip execution even with single-point failures.
- Continuous Self-Testing: Automatically monitors internal relay health and coil integrity.
- Trip Indication: Visual and remote indication of active trip conditions.
Application Scenarios
Mandatory for overspeed protection, low-lube-oil-pressure shutdown, and high-vibration trips on critical steam and gas turbines.
Performance Parameters
- Trip Response Time: Less than 20 milliseconds.
- Reliability: Extremely high MTTFd for safety functions.
Material Composition
High-reliability industrial relays with gold-plated contacts, housed in a ruggedized DIN-rail mountable enclosure.
Structural Characteristics
- Modular Design: Plugs into ProTech-SX backplane for easy replacement.
- Status LEDs: Front-panel indicators for power, normal operation, and trip status.
Working Principle
Receives processed trip signals from the ProTech-SX voting logic. When a valid trip condition is confirmed, the module energizes its relay coils to open or close contacts, de-energizing the turbine trip solenoid and initiating safe shutdown.
Installation Requirements
- Backplane: Must be installed in a compatible ProTech-SX rack.
- Wiring: Use dedicated wiring for trip circuits, separate from control signals.
Usage Precautions
- Testing: Perform periodic partial-stroke testing to verify relay functionality without shutting down the turbine.
- Replacement: Only replace with identical part number to maintain safety certification.
