Description
- Product Model: IS215WEMAH1B
- Manufacturer: GE
- System Platform: Mark VIe Wind Turbine Control
- Power Supply Voltage: 24 V DC nominal (typical tolerance 18-32 V DC), supporting control circuits in variable nacelle or tower conditions
- Power Consumption: Approximately 25-50 W, balancing functionality with thermal management in enclosed cabinets
- Operating Temperature Range: -30°C to +65°C, enabling reliable performance across diverse wind farm climates
- Humidity Tolerance: Up to 95% non-condensing, with surface-mount technology and protective design for environmental resilience
- Dimensions: Standard industrial PCB form factor (approximately 200-300 mm range), optimized for cabinet mounting
- Weight: Lightweight design (typically under 2 kg), easing installation and replacement at height
- Communication Interfaces: Ethernet-based integration via Mark VIe IONet for redundant, high-speed data exchange with controllers and converter packs
- Analog Inputs: Includes 2 thermistor temperature sensor inputs for monitoring critical cabinet or converter temperatures
- Outputs: 9 relay contact outputs plus 3 solid-state relay outputs, providing versatile control for contactors, alarms, and auxiliary functions
- Analog Output Capability: Supports 0-20 mA current loops (with maximum lead resistance 15 Ω), suitable for external monitoring or control signals
- Signal Conditioning: Built-in isolation and filtering to maintain integrity in high-EMI environments near power converters
- MTBF: Engineered for high availability (>150,000 hours typical in wind duty cycles), reducing unplanned maintenance
- Certifications: Compliant with relevant IEC 61400 wind turbine standards where applicable, CE marking, and industrial environmental ratings
- Enclosure/Protection: Conformal coating on PCB for protection against dust, moisture, and vibration in turbine nacelles or towers
Technical Architecture & Functional Positioning
The IS215WEMAH1B is positioned as the central main cabinet board (WEMA – Wind Energy Main Assembly) within the Mark VIe distributed control hierarchy for wind turbines. It resides in the main electrical cabinet, serving as a consolidation point for converter-related control, monitoring, and interfacing. Unlike distributed I/O packs, this board aggregates signals from multiple subsystems—such as rotor-side and grid-side converters—while providing direct relay-driven outputs for safety and operational commands. This architecture supports the demanding requirements of variable-speed wind generation, where precise coordination between mechanical, electrical, and control elements is essential for grid compliance and energy capture optimization.
Core technologies include surface-mount electronics for compact, reliable operation, combined with redundant Ethernet connectivity to the Mark VIe controller network. The board handles temperature supervision via dedicated thermistor channels, processes status inputs, and executes relay logic for functions like converter enable/disable, fault annunciation, or auxiliary power switching. Relay outputs (9 contact + 3 solid-state) enable direct interfacing with high-power devices without intermediate relays in many cases, reducing latency and points of failure. In DFIG systems, it facilitates stable control during grid disturbances by ensuring fast signal paths and isolated channels to mitigate EMI from switching converters.
Engineering significance stems from addressing wind-specific reliability challenges: thermal cycling, vibration, and electrical noise in remote locations. The board’s design contributes to overall system availability by providing deterministic response for protection and control tasks, supporting predictive diagnostics through integrated monitoring, and enabling seamless integration with GE’s toolboxST for configuration and trending.
Typical Application Scenarios
- Central control element in GE wind turbines (1-3+ MW class) for main converter cabinet management, coordinating power electronics and turbine supervisory functions.
- Used in onshore and offshore wind farms to handle temperature monitoring, relay-based sequencing, and converter status interfacing for optimal energy production.
- Serves as a direct replacement or upgrade in existing Mark VIe-equipped fleets, preserving original wiring and logic during maintenance or life extension projects.
- Applied in variable-speed DFIG configurations for grid synchronization, fault ride-through support, and auxiliary system control.
- Utilized in harsh-environment wind installations where robust outputs and environmental hardening ensure continuous operation under extreme weather conditions.
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