Description
GE IS200EDEXG1A
Technical Specifications
- Part Number: IS200EDEXG1A
- Manufacturer: General Electric
- Series: EX2100 Excitation Control
- Product Type: De-Excitation Module Main Board
- Weight: 3 lbs 6 oz
- Origin: United States
- Control Board: EXHS
- Group: G1 (SCR de-excitation)
- Functional Revision: A
- Manual Reference: GEI-100466
Key Features
- De-excitation SCR firing control for safe generator shutdown
- Conduction sense feedback for monitoring de-excitation status
- Voltage retention capability during power outages
- Controlled by EXTB board under normal operation
- Can initiate de-excitation independently if control fails
- Group 1 design for SCR-based de-excitation systems
- Group 2 variant available for diode-based de-excitation
Application Scenarios Synchronous generator excitation systems, power plant turbine-generator sets, industrial cogeneration facilities, utility power generation stations, hydroelectric generators, gas turbine generator packages
Performance Parameters
- Power Supply: 125VDC converted to 24VDC via EPSM module
- De-Excitation Type: SCR firing (Group 1)
- Control Interface: EXTB board communication
- Backup Operation: Independent de-excitation initiation capability
Material Composition High-quality industrial-grade printed circuit board with surface-mount and through-hole components. Designed for reliable operation in power generation environments with appropriate conformal coating for environmental protection.
Structural Characteristics The IS200EDEXG1A is constructed as a multi-layer PCB designed for installation in the EX2100 de-excitation module enclosure. The board interfaces with the EXTB board for control signals and with the de-excitation SCR circuits for firing control. Status indicators and test points are provided for diagnostic purposes.
Working Principle Under normal operation, the IS200EDEXG1A receives de-excitation commands from the EXTB board. The EXTB board opens the 41 DC contactor (41A/41B) or breaker, then passes excitation signals from auxiliary contacts to the EDEX SCR firing circuits. The board monitors conduction status through feedback sensors and maintains voltage during power outages to ensure reliable de-excitation. If the EXTB control fails, the IS200EDEXG1A can independently initiate de-excitation to protect the generator. The Group 1 designation indicates this board is designed for SCR-based de-excitation systems, as opposed to Group 2 boards for diode-based systems.
Installation Requirements Installation must be performed by qualified personnel familiar with excitation systems and high-voltage safety procedures. The board must be properly seated in its module enclosure with all connections secure. The EPSM power supply module must be operational to provide 24VDC power. Proper grounding and shielding practices must be followed to prevent electrical interference.
Usage Notes The IS200EDEXG1A is used in both de-excitation and crowbar modules. Regular inspection of SCR firing circuits and conduction sensors is recommended. The board should be tested during scheduled maintenance to verify proper de-excitation timing and voltage retention. Replacement boards must be the correct Group designation (G1 for SCR systems) to ensure compatibility. All work should be performed with the excitation system de-energized and proper lockout/tagout procedures followed
