The GE IS200EDEXG1A functions as the primary PCB in an EX2100 De-Excitation Module and specifically functions to allow conduction sensing feedback, voltage retention during power failure, and de-excitation firing. The product manual for the IS200EDEXG1A is GEI-100466.

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Product Description

The IS200EDEXG1A model is a De-Excitation module that is primarily used to function as a bridge and protection board. The prime purpose of this board is to store energy that has been provided to the generator, the energy that has been provided to the generator must be dissipated upon shutdown.

It is important when operating this board that you note that the IS200EDEXG1A board is typically controlled by the EXTB. This module provides conduction sensing feedback, plus voltage retention which will ensure that the board can still operate in case a power-failure event occurs and allows for SCR de-excitation firing. When two of the control inputs reads as true or the anode to cathode voltage related to the SCR exceeds a certain value that is when the SCR de-excitation will fire. 

This board comes equipped with Hall effect conduction sensors which will sense the magnetic field produced by field current discharge that flows through the thyristor. The IS200EDEXG1A board receives power from the ESPM module, the power that should be received from that module should be 24 VDC; the EDEX module will then turn the power received into 125 VDC.

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