IS200ESELH2AAA - Exciter Selector Board

SPECIFICATIONS

Part Number: IS200ESELH2AAA
Manufacturer: General Electric
Country of Manufacture: United States (USA)
Series: EX2100
Number of Bridge Drivers: 1
Number of ESEL Boards Needed for Redundant Controls: 2
Function: Exciter Selector Board

Functional Description

IS200ESELH2AAA is an Exciter Selector Board developed by GE. It is part of the GE Speedtronic EX2100 excitation system. It is mounted within the control rack of a power generation system. Its primary function is to interface with the master I/O (EMIO) board, from which it receives six logic-level gate pulse signals. These signals are crucial for the system, operation as they dictate the timing and control of the excitation process.

Features

• Upon receiving these gate pulse signals, the board processes and relays them through six cables. These cables are integral to the system's functionality, as they transmit the gate pulses to the exciter gate pulse amplifier (EGPA) boards.
• The boards are located in the Power Conversion Cabinet, where they play a pivotal role in amplifying and managing the gate pulses to ensure the correct operation of the exciter.
• The precise distribution and amplification of these gate pulses by the ESEL and EGPA boards are critical for maintaining the stability and efficiency of the power generation system. This meticulous process ensures that the excitation system operates within optimal parameters, contributing to the overall reliability and performance of the power plant.

Offline Replacement Procedure

• De-Energize the Exciter: Ensure that the exciter is completely de-energized.
• Verify Power Off: Open the control cabinet door. Check that the power indicators on the EPDM and EPSM power supplies are off. Confirm that the three LEDs on the board are off.
• Remove the Board: Loosen the screws at the top and bottom of the faceplate, near the ejector tabs. These screws are captive and should not be removed. Raise the ejector tabs to unseat the board. Using both hands, gently pull the board from the rack.
• Install the Replacement Board: Slide the replacement board into the correct slot in the rack. Firmly press the top and bottom of the faceplate simultaneously with your thumbs to begin seating the board. Start and alternately tighten the screws at the top and bottom of the faceplate to finish seating the board. Tighten the screws evenly to ensure the board is seated squarely.

Application Data

• The board is designed without any jumpers or test points. This simplifies the board's design and eliminates the need for manual adjustments or testing points on the board itself.
• The board features two connectors, P1 and P2, which interface with the VME backplane. These connectors are crucial for the board's integration into the system, but the individual pin signals for these connectors are typically not referenced or checked during routine troubleshooting and maintenance procedures. Therefore, detailed pin signal definitions for P1 and P2 are not provided in this document.
• The layout of the ESEL board is depicted in the following figure (refer to the actual document or schematic provided with the board). This layout illustration is essential for understanding the physical arrangement and components on the board.

Status LEDs

Equipped with three green LEDs located at the top of the front panel. These LEDs serve as status indicators, providing important information about the board's operational state

• Power Indicator: One LED illuminates to indicate that power is being supplied to the board.
• Active Indicator: Another LED lights up to show that the board is active and has been enabled by a control signal from the control system (Control C).
• Gating Indicator: The third LED indicates that the board is in gating mode, driven by gate inputs received from the EMIO (Exciter Master Input/Output) board. 

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FREQUENTLY ASKED QUESTIONS

What is IS200ESELH2AAA?
It is an exciter selector board and is part of the GE Speedtronic EX2100 gas turbine control system.

What connectors does the board use to interface with the system?
The board uses two connectors, P1 and P2, to connect to the VME backplane. These connectors are crucial for integrating the board into the system. However, the individual pin signals for these connectors are typically not referenced or checked during routine troubleshooting and maintenance.

Are the pin signals for connectors P1 and P2 defined in the documentation?
No, the pin signals for connectors P1 and P2 are not defined in the documentation since these individual pin signals are not normally checked during troubleshooting.

What do the three green LEDs on the front panel of the board indicate?
The power indicator illuminates to indicate that power is being supplied to the board. Active LED lights up to show that the board is active and has been enabled by a control signal from the control system (Control C). Gating indicates that the board is in gating mode, driven by gate inputs received from the EMIO (Exciter Master Input/Output) board.