The GE IS200EDCFG1A (commonly designated as the EDCF board) is a specialized DC Feedback Board designed for General Electric’s EX2100, EX2100e, and LS2100 static exciter and output startup control systems (part of the Mark VI and Mark VIe turbine control and excitation product lines). Installed within the excitation control cabinet, the EDCF board conditions, measures, and feeds back high-voltage DC field excitation voltages and currents to the main regulator controller.
Key Specifications & Identification
| Attribute | Details |
| Manufacturer | General Electric (GE / GE Vernova) |
| Product Line | EX2100 / EX2100e Excitation & Static Starter Systems |
| Model / Part Number | IS200EDCFG1A (EDCF Group 1, Revision A) |
| Primary Function | High-Voltage DC Field Voltage & Current Feedback Conditioning |
| Signal Inputs | Direct high-voltage DC bridge inputs and shunt current transducer signals |
| Output Signals | Isolated, scaled low-level analog feedback signals to the Mark VIe regulator controller |
| Mounting Format | Panel/Chassis-mounted terminal and printed circuit board assembly within exciter bays |
Primary System Functions
- High-Voltage DC Measurement: Accurately measures the DC output voltage and load current delivered by the exciter bridge to the generator rotor field winding.
- Closed-Loop Regulation Feedback: Feeds real-time voltage and current values back to the primary controller (such as the Mark VIe M1/M2/M3 regulator core) to maintain precise automatic voltage regulation (AVR) and field current limit control.
- Galvanic Isolation: Provides high-voltage electrical isolation between the dangerous high-voltage power generation bus (rotor circuit) and low-voltage digital control electronics.
- Exciter Protection Interlocks: Assists in detecting abnormal field conditions, such as field ground faults, overvoltages, or loss of field, triggering protective trips when necessary.
Servicing & Installation Guidelines
- Dangerous High Voltage (LOTO Required): The EDCF board connects directly to high-voltage generator rotor circuits (often hundreds of volts DC). Always de-energize the exciter, lock out (LOTO) incoming AC supply breakers, and verify zero energy state across the field terminals before touching or replacing the board.
- ESD & Handling Precautions: Sensitive analog isolation barriers and precision measurement components require strict static controls. Always wear a grounded anti-static wrist strap during handling.
- Terminal Wiring & Calibration Check: Document wire numbers and terminal connection points carefully before removal. Verify board configuration jumpers and scaling settings match the original factory specifications before commissioning a replacement module.
