IS200EACFG2BAA - Exciter AC Feedback Board

IS200EACFG2BAA - Exciter AC Feedback Board IS200EACFG2BAA - Exciter AC Feedback Board

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Part No.: IS200EACFG2BAA
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Temperature: 0 to 60 °C
Voltage Measurement: 1000 V rms at 50/60 Hz
Air Core CT/Flux Coil Inputs: 0 to 0.8 V rms
Product Type: Exciter AC Feedback board
Availability: In Stock
Series: EX2100

Functional Description

IS200EACFG2BAA is an exciter AC feedback board developed by GE. It is a part of EX2100 excitation system.The Exciter Ac Feedback monitors and manages the exciter PPT AC supply voltage and current within a power generation system. Positioned within the exciter auxiliary cabinet, this board is designed to measure inputs of up to 1000 V rms, providing accurate readings for optimal excitation control.


  • One of the key features of the board is its capability to measure three-phase voltage through transformers integrated into the terminal board. Additionally, the board accommodates two Flux/Air core coils, enhancing its versatility in capturing a comprehensive range of exciter parameters. To ensure precision and reliability, the outputs from the voltage and current circuits are efficiently distributed to three DB9 connectors, facilitating seamless connections to controllers M1, M2, and C.
  • To address potential high-frequency noise interference, the board incorporates effective suppression mechanisms near the signal entry points, particularly for the flux/air core input signals. Moreover, the board includes cable shield terminal screws, strategically positioned within a three-inch proximity to the input screws where applicable, ensuring a robust connection to chassis ground for enhanced shielding against external disturbances.
  • One notable aspect of the board's design is its compatibility with extended cable lengths. The cable connecting the EACF to the EBKP backplane board can span up to 90 meters, offering flexibility in system layout and installation. This feature is particularly advantageous in scenarios where physical separation between the exciter and control components is necessary.
  • In terms of exciter voltage measurement, the EACF board is proficient in handling a single three-phase input voltage within the nominal range of up to 1000 V rms, with a permissible variation of +20 percent at 50/60 Hz. The potential transformers integrated into both the EACF and EBKP backplane boards contribute to this capability by supplying a nominal 1.6 V rms from their secondary outputs, ensuring accurate and standardized voltage readings for efficient excitation control.
  • Exciter Ac Feedback board stands as a vital component in power generation systems, offering precise measurement and control capabilities for exciter PPT AC supply voltage and current. Its robust design, noise suppression features, and compatibility with extended cable lengths make it a reliable and flexible solution for excitation control in diverse operational environments.

Application Data

  • The layout of the Exciter Ac Feedback (EACF) board is meticulously designed to accommodate various components and facilitate efficient connections.
  • At the heart of the board are the three-phase voltage transformers labeled T1 through T4. These transformers play a pivotal role in capturing and processing the exciter PPT AC supply voltage. The individual screw connectors, denoted as TB1, TB2, and TB3, serve as entry points for the voltage inputs. This configuration allows for a streamlined and organized connection of the three-phase voltage signals, ensuring accuracy in measurement and control.
  • Adjacent to the voltage connectors is terminal block TB4, specifically designated for wiring from the two Flux/Air core coils. This terminal block serves as a central hub for connecting and managing the input signals from these coils.
  • For seamless integration with the broader control system, the board features three 9-pin sub-D connectors labeled J504, J509, and J514. These connectors serve as the interfaces for cables that link the board to the EBKP backplane, particularly for the EMIO (Exciter Machine Interface Output) boards. The EMIO boards play a critical role in interfacing with controllers and other components within the system, contributing to the overall functionality and coordination of the power generation system.
  • The connectivity provided by these sub-D connectors ensures a reliable and standardized interface between the board and the EBKP backplane, facilitating communication and data exchange. This integration is essential for the smooth operation of the excitation control system, allowing the board to work in tandem with other components to maintain optimal excitation levels.

Handling Precautions

  • Handling precautions are of utmost importance to safeguard electronic components, particularly in environments where static electricity poses a risk of damage. Adhering to static-sensitive handling techniques is crucial to preventing potential harm to the boards. This precaution becomes especially relevant during the handling and installation processes. To mitigate the risk of static discharge, it is recommended to wear a wrist grounding strap when handling boards or components.
  • However, this precaution should only be taken after ensuring that the boards or components have been removed from potentially energized equipment and are placed at a normally grounded workstation. This ensures that any accumulated static charge is dissipated to ground, minimizing the risk of discharge onto sensitive components.
  • Recognizing the susceptibility of printed wiring boards to static electricity, GE takes the precautionary measure of shipping all replacement boards in antistatic bags. It is essential to uphold this protective environment throughout the handling process.
  • Boards should be stored in antistatic bags or antistatic boxes to prevent static buildup and discharge. Furthermore, boards should only be removed from their antistatic packaging in a controlled environment, such as a grounded workstation. These measures help maintain the integrity of the boards by minimizing the risk of static-induced damage.
  • In line with the caution criteria mentioned earlier, the use of grounding straps during board handling is emphasized. These grounding straps serve as conduits for static charges, allowing them to dissipate harmlessly to ground.
  • This precautionary step is an essential part of the overall strategy to protect the boards from potential static-related damage. The combination of using antistatic packaging during storage and transportation, along with grounding straps during handling, creates a comprehensive approach to ensuring the reliability and longevity of electronic components. This is particularly crucial in applications where precise and reliable operation of equipment, such as the Exciter Ac Feedback board, is paramount for overall system performance.

J504 Connector Pin Description

  • Pin 1 & 2: These pins handle the negative signals from the Current Transformer (CT). Pin 1 corresponds to the signal from CT1, while Pin 2 pertains to CT2.
  • Pin 3 & 4: Similar to Pins 1 and 2, these pins manage the negative signals but from the Power Potential Transformer (PPT). Pin 3 is associated with the signal from PPT1, whereas Pin 4 relates to PPT2.
  • Pin 5: This pin is marked as Not connected, indicating that there is no active connection or function assigned to it within the cable-to-M1 configuration.
  • Pin 6 & 7: These pins govern the positive signals from the Current Transformer (CT). Pin 6 corresponds to the positive signal from CT1, while Pin 7 handles the positive signal from CT2.
  • Pin 8 & 9: Similar to Pins 6 and 7, these pins manage the positive signals but from the Power Potential Transformer (PPT). Pin 8 relates to the signal from PPT1, and Pin 9 pertains to PPT2.

Exciter Voltage Measurement

Exciter voltage measurement is a crucial aspect of monitoring and controlling the excitation system. The voltage measurement capabilities vary between different versions of the system, as outlined below:

  • G1 Version:
    • The G1 version of the excitation system supports measurement of a single three-phase input voltage.
    • The nominal range for this voltage measurement extends up to 480 V rms, with a permissible tolerance of +20%.
    • This measurement is conducted at standard power frequencies of 50/60 Hz.
  • G2 Version:
    • In contrast, the G2 version of the excitation system offers expanded voltage measurement capabilities.
    • It supports measurement of a single three-phase input voltage with a nominal range extending up to 1000 V rms.
    • Similar to the G1 version, the permissible tolerance for voltage measurement is +20%.
    • This measurement is also performed at standard power frequencies of 50/60 Hz.
  • Potential Transformers (PTs):
    • Both the G1 and G2 versions are equipped with potential transformers (PTs) to facilitate voltage measurement.
    • These PTs supply a nominal output of 1.6 V rms from their secondary outputs.
    • The voltage output from the PTs serves as a reliable and accurate representation of the exciter input voltage.

The WOC team is always available to help you with your EX2100 requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS200EACFG2BAA?
It is an exciter AC feedback board developed by GE under the EX2100 series.

What is the output voltage range of the air-core current transformers?
The air core current transformers deliver a nominal secondary output voltage in the range of 0 to 0.8 V rms at 50/60 Hz.

How does the board handle high-frequency noise interference?
The board addresses potential high-frequency noise interference by incorporating effective suppression mechanisms near the signal entry points. This feature is particularly designed to safeguard against disruptions, ensuring the accuracy and reliability of the signal processing, especially for flux/air core input signals.

What measures are in place for shielding against external disturbances in the board design?
The board includes cable shield terminal screws strategically positioned within a three-inch proximity to the input screws where applicable. This design choice enhances the board's ability to create a robust connection to chassis ground. By establishing a solid grounding connection, the board improves its shielding capabilities, guarding against external disturbances that could compromise signal integrity.