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The GE IS200EDFFH3AAA EX2100e DC Fanned Feedback Board (EDFF) is a critical component used in the latest generation of the GE EX2100e Excitation Control System.1
Its primary function is to provide the main control system with accurate and high-speed feedback of the generator’s Field DC Voltage and Current while incorporating cooling fan controls essential for system thermal management. The “Fanned Feedback” name is derived from this dual role.
⚙️ Core Functions
The EDFF board centralizes several crucial tasks required for reliable excitation control:
1. DC Voltage and Current Feedback
The EDFF board measures the generator’s field parameters, similar to the older EDCF board, but with updated technology:
- Field Current Measurement: Measures the current across a DC shunt located at the power bridge.2
- Field Voltage Measurement: Measures the DC voltage across the exciter bridge terminals.
- Isolated Transmission: The board conditions these signals and transmits them back to the main controller (typically the DSPX board) via a reliable, isolated link, often using fiber optics or a high-speed digital protocol, to maintain noise immunity.
2. Cooling Fan Control
A key distinguishing feature of the EDFF is its integrated fan control for the power conversion cabinet (PCC):
- Fan Management: The board receives commands from the main controller to manage the operation of the PCC’s cooling fans.
- Feedback: It monitors the status and health of the fans, providing feedback to the controller to detect failures or abnormal operation.
3. Protection and Sensing
- Temperature Monitoring: Interfaces with thermistor temperature sensors installed on the SCR (Thyristor) stacks, providing essential over-temperature protection data.
- Gate Firing Interface: It is positioned to manage or interface with the gate pulse commands for the SCRs, which are generated by the DSPX board.
🛠️ Technical Specifications
| Feature | Details |
| System | GE EX2100e Excitation Control System (Enhanced) |
| Function | Exciter DC Feedback, Fan Control, and Temperature Monitoring |
| Inputs | Field DC Current (via shunt) and Field DC Voltage |
| Control | Integrated Cooling Fan Control and Status Monitoring |
| Sensors | Interfaces with Thermistor Temperature Sensors |
| Revision | The suffix H3AAA denotes a specific hardware and firmware revision designed for the EX2100e architecture. |
The EDFF board is fundamental to the EX2100e system, combining high-accuracy measurement with critical thermal management and protection features in a single module.
