IS220TRPAH2A GE

Model: IS220TRPAH2A
Manufacturer: GE (General Electric)
Core Function: Serves as a passive terminal board providing field wiring termination, signal conditioning, and electrical isolation for primary turbine trip signals, including speed sensors, flame detectors, and discrete inputs/outputs, interfacing directly with compatible PTUR I/O packs.
System Compatibility: Compatible with Mark VIe and Mark VIeS control systems, specifically designed to mount IS220PTURH series (e.g., IS220PTURH1A/B/F) primary turbine I/O packs for protection functions.
Supply Status: In Stock / Available as refurbished or surplus from global inventory.
Warranty Standard: 12-month functional warranty, fully tested.

Key Technical Specifications

Product Model: IS220TRPAH2A
Manufacturer: GE
System Platform: Mark VIe Turbine Control System
Mounting Type: Direct rack or panel mounting with screw terminals for field wiring
Compatible I/O Packs: Supports simplex or redundant mounting of IS220PTURH1A, IS220PTURH1B, IS220PTURH1BF primary turbine trip packs
Speed Sensor Inputs: Termination for up to 4 magnetic pickup (MPU) channels with shielded twisted-pair wiring and surge suppression
Flame Sensor Inputs: Termination for up to 8 flame detector channels (UV/IR types) with isolated inputs and fault monitoring provisions
Discrete Inputs/Outputs: Multiple contact input terminations for emergency trips, permissives, and status; relay or solid-state output interfaces
Power Supply: Passive board; powered via attached I/O pack (typically 24-28 V DC from Mark VIe system)
Operating Temperature Range: -30°C to +65°C, suitable for turbine enclosure and control room conditions
Humidity Tolerance: 5% to 95% non-condensing, with optional conformal coating on board traces
Dimensions: Standard Mark VIe terminal board footprint (approximately 20-25 cm height × 15-20 cm width, varies by mounting)
Weight: Approximately 0.8-1.2 kg, depending on configuration
Certification Standards: CE compliant, UL listed components, meets IEC 61131-2 environmental/EMC requirements; hazardous location certifications (e.g., ATEX/IECEx) via associated system approvals
MTBF (Mean Time Between Failures): High passive reliability (>500,000 hours estimated), as no active electronics on board
Isolation Voltage: Up to 1500 V AC channel-to-channel and channel-to-ground via terminal design and suppression components

Technical Architecture & Functional Positioning

The IS220TRPAH2A functions as a passive accessory terminal board in the Mark VIe protection architecture, positioned at the field interface layer to securely terminate and condition critical turbine signals before they reach the active IS220PTURH series I/O packs. It provides screw terminal blocks for direct field wiring of speed probes, flame sensors, and discrete trip contacts, incorporating built-in surge protection, filtering, and isolation barriers to safeguard sensitive electronics from electrical transients common in power plant environments. The board mounts the PTUR pack via multi-pin connectors, enabling direct signal routing with minimal latency for overspeed, loss-of-flame, and emergency trip functions.

Its design emphasizes fail-safe operation through redundant wiring paths (where applicable), clear labeling for field connections, and compatibility with TMR configurations by supporting multiple pack attachments or voting logic tie-ins. This solves key engineering challenges in turbine safety, such as maintaining signal integrity over long cable runs while ensuring rapid trip execution during faults. The board lacks onboard processing, relying on the attached I/O pack for digitization and logic, which simplifies maintenance and enhances system modularity. Compliance with industrial standards allows deployment in classified areas when integrated into certified Mark VIe racks.