IS200EDCFG1ADC - Exciter DC Feedback Board

IS200EDCFG1ADC - Exciter DC Feedback Board IS200EDCFG1ADC - Exciter DC Feedback Board

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Part No.: IS200EDCFG1ADC
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
PCB Coating: Conformal
Technology: Surface-mount
Temperature Operating: -30 to 65oC
Product Type: Exciter DC Feedback Board
Availability: In Stock
Series: EX2100e

Functional Description

IS200EDCFG1ADC is a Exciter DC Feedback Board developed by GE. It is a part of EX2100e control system. The board plays a critical role in the EX2100e control system by measuring field current and field voltage at the SCR (Silicon-Controlled Rectifier) bridge. It establishes a vital link with the EISB in the control panel, facilitating communication over a high-speed fiber-optic link. This advanced communication method offers key advantages, including voltage isolation and high noise immunity, ensuring reliable and accurate data transfer between the boards.

Key Features

  • Measurement of Field Current and Voltage: The board is equipped with the capability to precisely measure both field current and field voltage at the SCR bridge. This information is crucial for monitoring and controlling the excitation process in power generation systems.
  • Communication via Fiber-Optic Link: The board establishes communication with the EISB board through a high-speed fiber-optic link. This communication method provides several advantages, including high data transfer rates, electrical isolation, and immunity to electromagnetic interference (EMI).
  • Voltage Isolation: The fiber-optic link ensures voltage isolation between EDCF and the EISB board. This is essential for maintaining electrical safety and preventing potential issues related to voltage differences.
  • High Noise Immunity: The utilization of fiber optics enhances the system's noise immunity. It minimizes the impact of electrical noise and interference, contributing to the overall reliability of the communication link.
  • Two-Fiber Configuration: The communication link utilizes two fibers—one for field current and one for field voltage. This dual-fiber configuration allows for independent transmission of each signal, ensuring accurate and uncompromised data transfer.
  • Fiber Types for Different Distances: It supports two types of fibers, each suitable for different distances -
    • Plastic Type Fiber: Designed for distances up to 10 meters.
    • Hard Clad Silica Type: Suitable for longer distances, reaching up to 90 meters.
  • Minimum Bending Radius: The minimum bending radius for these fiber-optic cables is specified at 1.5 inches. Adhering to this requirement ensures optimal performance and longevity of the cables.
  • Fiber Types and Distances:
    • Plastic Type Fiber: Ideal for shorter distances, providing reliable communication up to 10 meters.
    • Hard Clad Silica Type: Suited for longer distances, extending the communication range to up to 90 meters.

Power Supply

  • EDCF relies on a robust power supply system to ensure its optimal functionality within the EX2100e control system. The power supply configuration is designed to provide a stable and regulated voltage to meet the specific requirements of the board. Let's explore the key aspects of the power supply for the IS200EDCFG1A board:
  • Within the power supply system, three voltage regulators play a crucial role in converting the incoming ±24 V dc into regulated voltages suitable for the IS200EDCFG1A board's operation:
    • +15 V dc Output: This voltage regulator generates a stable +15 V dc output.
    • -15 V dc Output: Another voltage regulator produces a regulated -15 V dc output.
    • +5 V dc Output: The third voltage regulator is responsible for generating a +5 V dc output.
  • PSOK (Power Supply OK) green LED serves as a visual indicator of the power supply status. It is specifically driven by the ±15 V dc output voltages. The illumination of the PSOK LED signals that the ±15 V dc outputs are within the acceptable voltage range, indicating the overall health of the power supply system.
  • The PSOK LED serves as a valuable diagnostic tool, providing a quick visual reference for the status of the power supply. Its activation signals that the ±15 V dc outputs are operating within the specified voltage range, assuring operators and maintenance personnel that the power supply is functioning correctly.
  • The regulated +15 V dc, -15 V dc, and +5 V dc outputs are critical for the stable and reliable operation of the IS200EDCFG1A board. These voltages ensure that the board receives consistent and properly regulated power, minimizing the risk of voltage-related issues and contributing to the longevity of the board.
  • The power supply system is engineered to provide a reliable and stable source of power for the IS200EDCFG1A board. This reliability is crucial for maintaining the accuracy and precision of the field current and voltage measurements, as well as ensuring the integrity of the communication link with the EISB board.

Field Voltage Feedback

  • The field voltage feedback circuit within the board is a vital component responsible for accurately measuring and processing the field voltage in the context of the SCR bridge application. This circuit is designed with precision and flexibility to accommodate various bridge applications, providing seven selector settings for optimal scalability.
  • Selector Settings: The field voltage feedback circuit incorporates seven selector settings. These settings offer a range of options to scale down the bridge voltage, catering to different types of bridge applications. This scalability ensures adaptability to diverse operational requirements and bridge configurations.
  • Measurement Points: The field voltage is measured across specific points in the circuit—namely, the negative terminal of the bridge and the positive terminal of the current shunt. These measurement points are strategically chosen to capture the relevant voltage characteristics within the SCR bridge setup.
  • Scaling of Voltage: Following the measurement, the voltage is scaled down using jumpered resistors. These resistors are configured based on the selected setting from the seven available options. The scaling process is crucial for aligning the measured voltage with the operational requirements of the SCR bridge, ensuring accurate and manageable signal levels.
  • Differential Amplifier: The scaled voltage signals are then input into a differential amplifier. The role of the differential amplifier is to process and amplify the voltage differentials between the measured points. This amplification step is essential for enhancing the sensitivity and precision of the voltage feedback.
  • Voltage Controlled Oscillator (VCO): The output from the differential amplifier is fed into a voltage-controlled oscillator (VCO). The VCO is a critical component that translates the amplified voltage signals into frequency variations. This conversion allows for a dynamic representation of the field voltage, where changes in voltage result in corresponding changes in the frequency output.
  • Control Mechanism: The voltage-controlled oscillator serves as a control mechanism influenced by the field voltage feedback. As the field voltage undergoes variations, the VCO responds by adjusting its output frequency. This dynamic relationship provides a real-time representation of the field voltage conditions.
  • Benefits of the Field Voltage Feedback Circuit:
    • Scalability: The selector settings enable scalability, accommodating diverse bridge applications.
    • Precision: The differential amplifier enhances precision by amplifying voltage differentials.
    • Dynamic Response: The VCO ensures a dynamic response to changes in field voltage, offering real-time monitoring capabilities.
  • Applications: The field voltage feedback circuit is integral to excitation control systems, contributing to the accurate and dynamic regulation of field voltage in power generation applications. Its adaptability and precision make it a key element in ensuring optimal performance within SCR bridge setups.

The WOC team is always available to help you with your EX2100e requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS200EDCFG1ADC?
It is a Exciter DC Feedback Board developed by GE under the EX2100e series.

How is field current measured in the board?
The field current is measured across a dc shunt located at the SCR bridge. This measurement generates a low-level signal with a maximum value of 500 mV.

What is the purpose of the differential amplifier in field current measurement?
The low-level field current signal, generated by the dc shunt, is input to a differential amplifier. The amplifier plays a crucial role in enhancing the sensitivity and precision of the measured signal.

What is the output voltage range of the amplifier?
The output voltage from the differential amplifier ranges from -5 V to +5 V. This amplified voltage signal is then directed to further control elements in the system.

What component processes the output voltage from the amplifier?
The output voltage from the differential amplifier is directed into a voltage-controlled oscillator (VCO). The VCO translates the amplified voltage signal into frequency variations.