Description
- Product Model: IS215VPROH1B
- Manufacturer: GE
- System Platform: Mark VI Speedtronic Turbine Control
- Power Supply Voltage: 24 V DC nominal, operating range 18–32 V DC
- Power Consumption: Approximately 10–15 W under normal operation
- Processor/Logic: Triple-redundant voting logic for trip decisions
- Relay Outputs: Controls 12 relays on associated TREG board (9 configured in 2-out-of-3 voting groups for three trip solenoids)
- Input Signals: Accepts emergency trip commands, overspeed detection inputs, and manual stop signals
- Communication Interface: VME bus backplane for integration with Mark VI IONet and controller racks
- Response Time: Trip initiation < 50 ms for overspeed events
- Operating Temperature Range: -30°C to +65°C (extended industrial rating)
- Humidity Tolerance: 5% to 95% non-condensing
- Dimensions: Standard VME form factor, approximately 262 mm (H) × 200 mm (W) × 80 mm (D) approximate rack fit
- Weight: Approximately 2.5–3 kg
- Certification Standards: Compliant with IEC 61508 SIL 3 capable in redundant configurations, CE marked for EMC, designed to meet turbine safety standards (API 670)
- MTBF: > 150,000 hours (calculated per MIL-HDBK-217F at 40°C)
- Isolation: Galvanic isolation on critical trip paths, typically 1500 V AC
Technical Architecture & Functional Positioning
The IS215VPROH1B functions as the core of the independent protection layer in the Mark VI control architecture, positioned below the main control processors but parallel to them for fail-safe operation. It resides in the VME-based rack and operates autonomously from the primary application code, receiving speed signals and trip commands while executing dedicated hardware-based voting logic. This separation ensures that protection functions remain active even if the main controller experiences a software or processor fault.
At its core, the module employs triple-modular redundant (TMR) voting on input signals for overspeed, emergency stop, and other critical trips. It interfaces with the TREG terminal board to drive 12 high-current relays, where nine are grouped into three independent 2-out-of-3 voting sets, each controlling one of three trip solenoids (typically fuel shutoff valves or steam trip valves). This voting scheme provides high fault tolerance—allowing continued operation with one faulty channel—while ensuring de-energization on detected anomalies. The design incorporates watchdog timers and self-diagnostics to detect internal failures, forcing a safe trip state if anomalies are present. These features directly address the critical engineering requirement for rapid, reliable turbine shutdown to prevent catastrophic overspeed events, which can exceed 110–120% rated speed and cause blade liberation or rotor burst.
From an architectural standpoint, the VME bus integration allows seamless communication with IONet for status reporting to the HMI while maintaining electrical isolation for trip paths. The module supports simplex or TMR configurations, making it adaptable to different reliability targets in combined-cycle, simple-cycle, or industrial drive applications. Its value lies in reducing risk exposure in high-energy rotating machinery, where a single overspeed event can result in millions in damage and extended outages. Compliance with functional safety standards enables its use in safety instrumented systems (SIS) rated up to SIL 3 when properly configured.
Typical Application Scenarios
- Deployed in heavy-duty gas turbines (e.g., Frame 7FA, 9FA) for primary overspeed protection and emergency shutdown during startup, load rejection, or grid disturbances.
- Utilized in steam turbine generator sets for trip solenoid actuation on low lube oil pressure, high exhaust temperature, or manual emergency stop.
- Serves as a direct replacement or upgrade in legacy Mark V systems transitioning to Mark VI, maintaining compatibility with existing TREG/TRPG wiring.
- Supports combined-cycle plant retrofits where independent protection is required alongside DCS integration for enhanced availability.
- Applied in petrochemical compressor drives and power generation facilities requiring API 670-compliant overspeed and trip functions in harsh environments.
Quality Standards & Testing Procedures
In turbine control applications, protection modules like the IS215VPROH1B are mission-critical; failures can lead to uncontrolled acceleration, equipment destruction, or personnel hazards. We treat each unit as essential to safe operation and apply a disciplined, repeatable quality process aligned with industrial best practices to verify performance before release.
Sourcing begins with verified channels to ensure OEM or factory-remanufactured status, avoiding gray-market risks common in turbine spares.
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