Description
- Product Model: IS215REBFH1B
- Manufacturer: GE
- System Platform: Mark VI / Mark VIe Speedtronic
- Relay Outputs: Multiple isolated relay channels (typically 8-16 configurable) for discrete actuation of external devices
- Contact Rating: 5 A at 125 V DC / 250 V AC resistive, suitable for valve solenoids and contactors
- Power Supply: 24 V DC nominal from rack backplane, with low consumption design
- Interface Type: VME bus compatible for direct rack mounting and communication with controller packs
- Isolation: Galvanic isolation on relay outputs to prevent ground loops and enhance signal integrity
- Operating Temperature Range: -30°C to +65°C, designed for enclosed turbine control cabinets
- Humidity Tolerance: 5% to 95% non-condensing, with conformal coating for environmental protection
- Mounting Type: Rack-mounted VME form factor with secure connectors
- Dimensions (approx.): Standard Mark VI board size, approximately 292 mm x 130 mm x 27 mm
- Weight: Approximately 0.6-1.0 kg, facilitating easy handling during replacement
- Certification Standards: CE compliant, UL recognized for industrial control equipment, meets IEEE and ANSI turbine safety norms
- Mean Time Between Failures (MTBF): >100,000 hours in continuous turbine operation
- Response Time: Relay actuation <20 ms, critical for protection and sequencing functions
- Diagnostic Features: LED indicators for relay status and power health monitoring
Technical Architecture & Functional Positioning
The IS215REBFH1B functions as an I/O expansion module at the field interface layer in GE Mark VI / Mark VIe systems. It extends the base I/O capacity of the control rack by adding additional relay outputs and interface points, connecting directly to the VME backplane for communication with processor packs and other I/O modules. This positioning allows it to handle discrete control tasks such as actuating trip solenoids, interlocks, or auxiliary devices while maintaining high-integrity signal paths essential for turbine protection logic.
The module employs isolated relay technology with robust contact materials, combined with diagnostic feedback circuits that report status to the controller for real-time monitoring. These features solve key engineering challenges: expanding system I/O without requiring additional racks, providing reliable actuation in noisy electrical environments, and enabling fault detection to prevent undetected relay failures that could compromise safety. The conformal coating and VME design ensure durability in high-vibration turbine settings.
Its architecture supports both simplex and redundant configurations, allowing online testing of relay paths and seamless integration into existing turbine control strategies. This modularity is particularly valuable for upgrades or expansions where additional control points are needed without disrupting ongoing operations.
Typical Application Scenarios
- Deployed in gas turbine Mark VI systems for expanded relay logic in protection circuits, actuating fuel shutoff or emergency stop functions.
- Used in steam turbine controls to interface additional auxiliary devices, such as lube oil pumps or steam valves, enhancing system flexibility.
- Serves as a direct replacement or spare in operational Mark VI / Mark VIe installations, maintaining existing field wiring.
- Integrated in combined-cycle plants for coordinated control across multiple turbines, supporting increased I/O demands.
- Applied in industrial retrofit projects, providing cost-effective I/O expansion for legacy Mark VI platforms without full system replacement.
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