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The GE IS200EBRGH2A Exciter Bridge Interface Board (EBRG) is a specialized Printed Circuit Board (PCB) used in the GE EX2100e Excitation Control System.1
Its primary role is to serve as the crucial interface and conduit between the low-voltage digital control system (the DSPX controllers) and the high-power SCR (Thyristor) Exciter Bridge and its related I/O.2
⚙️ Core Functions and Integration
The EBRG board manages the communication and coordination necessary for the control system to operate the main power bridge that controls the generator’s field current:3
- Gate Pulse Control Interface: The board takes the precise firing commands from the DSPX controller and generates the necessary gate pulses to turn on the Silicon Controlled Rectifiers (SCRs) in the power bridge. This ensures accurate control over the DC field current for voltage regulation.4
- Bridge I/O Management: It interfaces with various control and feedback signals related to the power bridge, including:
- Blown Fuse Detectors: Status feedback on the integrity of the power fuses.5
- Bridge Temperature: Inputs from over-temperature and thermistor temperature sensors.
- Cooling Fan Control: Outputs for fan starters and inputs for fan status feedback.6
- Current Sensing: Interfaces with bridge line current sensors, such as Rogowski coils.7
- Power Supply Interface: It facilitates the connection of the customer’s AC and DC control power supplies to the control system hardware.8
- Compatibility: The EBRG is designed to be highly versatile, working with most SCR devices and supporting various bridge architectures, including simplex, warm backup (WBU), and parallel bridge converters.9
🛠️ Technical Specifications
| Feature | Details |
| System | GE EX2100e Excitation Control System (Mark VIe Series) |
| Function | Exciter Bridge Interface and Protection Module |
| Controlled Gates | Typically controls up to 6 gates for the three-phase bridge. |
| Compatibility | Designed for use with 42mm, 52mm, and 77mm Thyristor systems. |
| Power Supply | Operates on a 125 VDC power supply. |
| Interface | Provides the control interface from the M1 and M2 controllers but typically does not interface with the common C controller for bridge firing. |
| Diagnostics | Features LED indicators to provide status on conditions like bridge temperature, fault conditions, and gate power supply. |
The EBRG board is physically located in the Power Conversion Cabinet (PCC) and is essential for the reliability and precise operation of the EX2100e excitation system.10
