Description
- Product Model: IS215WEMAH1BB
- Manufacturer: GE
- System Platform: Mark VIe Wind Turbine Control
- Power Supply Voltage: 24 V DC nominal (tolerance typically 18-32 V DC), derived from cabinet power distribution for reliable control operation
- Power Consumption: Approximately 25-50 W, designed for efficient thermal performance in enclosed turbine cabinets
- Operating Temperature Range: -30°C to +65°C, supporting deployment in varied onshore wind environments with temperature extremes
- Humidity Tolerance: Up to 95% non-condensing, enhanced by conformal coating and robust PCB layout for moisture-prone locations
- Dimensions: Compact industrial form factor (approximately 26 cm H × 21 cm W typical for WEMA series), optimized for main cabinet mounting
- Weight: Under 2 kg, enabling safe and efficient replacement during tower or nacelle maintenance
- Communication Interfaces: Dual redundant Ethernet ports via Mark VIe IONet, providing high-speed, fault-tolerant data exchange with turbine controllers
- Analog Inputs: Multiple channels including 2 thermistor inputs for cabinet and converter temperature monitoring
- Outputs: 9 electromechanical relay contacts + 3 solid-state relay outputs for sequencing, alarms, and auxiliary control
- Analog Output: 0-20 mA current loops (maximum lead resistance 15 Ω), supporting external indicators or interfaces
- Signal Isolation: Galvanic isolation and filtering on key channels to ensure signal integrity amid converter EMI
- MTBF: High-reliability design (>150,000 hours typical in wind cycle duty), minimizing field interventions
- Certifications: Compliant with IEC 61400 wind standards where applicable, CE marking, and industrial environmental qualifications
- Protection Features: Conformal-coated PCB for resistance to dust, salt, vibration, and condensation in turbine installations
Technical Architecture & Functional Positioning
The IS215WEMAH1BB integrates the Wind Energy Main Assembly (WEMA) functionality with Backplane Power Control (BPPC) in a single assembly, positioned as the core supervisory and interface element in the main electrical cabinet of GE wind turbines. It consolidates control tasks that span converter coordination, environmental monitoring, and discrete actuation, operating within the distributed Mark VIe architecture to maintain high availability in variable renewable generation.
The board employs surface-mount technology with redundant Ethernet connectivity to the IONet network, enabling seamless integration with higher-level controllers while handling local I/O processing. Relay outputs provide direct, low-latency control over contactors, brakes, or auxiliary systems, while analog capabilities support precise monitoring and feedback. Temperature channels feed critical thermal data into protection logic, preventing overheating in power-dense cabinets. This combined WEMA-BPPC design reduces wiring complexity and points of failure compared to separate modules, addressing wind industry needs for compact, reliable cabinet-level control.
Engineering advantages include deterministic response for fault handling, EMI-hardened signal paths critical near IGBT-based converters, and support for predictive maintenance through diagnostic data access via toolboxST. In DFIG turbines, it ensures stable grid interaction during transients by coordinating converter enablement and status reporting, contributing to overall system uptime and energy yield.
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