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The GE IS200AEPAH1AAA is a highly specialized Printed Circuit Board (PCB) from the General Electric Mark VI Speedtronic Turbine Control System series. Its functional acronym, AEPA, stands for Alternative Energy Pitch Axis, indicating a critical role in wind turbine control systems.
This board is an advanced I/O module designed to manage the numerous inputs and outputs required for precise control of wind turbine blades (pitch axis control) and other complex auxiliary functions.
⚙️ Product Profile and Function
The IS200AEPAH1AAA is a standard assembly PCB (part of the IS200 series) that connects to the main Mark VI controller. It serves as a single-board interface with high-density I/O specific to the wind turbine application.
| Parameter | Specification/Detail |
| Functional Acronym | AEPA (Alternative Energy Pitch Axis) |
| Primary Function | I/O and Control for Wind Turbine Pitch Axis (blade control) |
| System Family | GE Mark VI (or Mark VIe Wind) Speedtronic Control |
| Redundancy Support | Compatible with Simplex, Dual, or Triple Modular Redundant (TMR) architectures. |
| Environmental Protection | Includes Conformal Coating for protection against moisture and contaminants. |
| Revision | H1AAA—This highly specific revision is crucial for compatibility. |
🛠️ Key Technical Features
The AEPA board is notable for its extensive and varied I/O capabilities, all integrated onto one module for the complex demands of pitch control:
- Inputs & Outputs: The board is densely populated, providing a mix of signal types:
- Analog Inputs (AI): Typically 8 inputs (e.g., for monitoring temperature, voltage, pressure).
- Discrete Inputs (DI): Typically 20 inputs (e.g., for limit switches and protective signals).
- Relay Outputs (RO): Typically 8 relays (for switching external loads, alarms, or motors).
- Analog Output (AO): Typically 1 output (for sending control references).
- Encoder Inputs: Supports both 1 Incremental Encoder and 1 Absolute Encoder input for precise position and speed feedback from the pitch mechanism.
- Brake Control Output: Features 1 dedicated output for managing the braking system.
- Auxiliary Connectivity: The board is designed to interface with an optional auxiliary board (daughterboard) via two plug connectors in the upper left corner, enhancing its functionality.
- Surge Protection: Includes several Metal Oxide Varistors (MOVs) for crucial surge protection.
- Communication: Communicates with the main Mark VI controller via internal connectors and supports standard system protocols like IONet and Unit Data Highway (UDH).
⚠️ Important Considerations for Replacement
- Revision Match: The IS200AEPAH1AAA must be replaced with a board of the exact same revision (H1AAA) or a known compatible replacement specified by GE. Mismatched revisions can cause major control system failures due to incompatible firmware or signal scaling.
- Application-Specific: This board’s I/O is highly specific to the pitch axis control of a wind turbine. It is not a general-purpose I/O module and cannot be substituted for other Mark VI boards without extensive configuration changes.
