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General Electric Exciter De-excitation Board IS200EDEXG2B was produced for the EX2100e series. This board is the primary board in the de-excitation module. The IS200EDEXG2B board is used in conjunction with the EAUX board which controls the main de-excitation firing function of this model.



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  • Part Number: IS200EDEXG2B
  • Manufacturer: GE Industrial Systems
  • Series: EX2100e Excitation Control

IS200EDEXG2B Technical Specifications

Board Type Protection/Bridge Board
Functional Acronym/Abbreviation EDEX
Part-Specific Manual GEI-100466
Power Supply 28 VDC
Primary Function De-Excitation Board
Series EX2100e
Weight approx. 3 lbs. 6 ounces.

Product Description

The IS200EDEXG2B board is a De-Excitation board used to dissipate stored energy from the generator field inductances. There are two independent circuits that will fire SCR gating when the anode-to-cathode voltage of the SCR exceeds a certain value or when either of the two control inputs reads true. These two independent circuits are also supplied by two different power supplies. 

If this model is being used with a large exciter it is extremely important as well as necessary to connect multiple EDEX boards together, one will function as the Master board and the remaining boards will function as Slave boards. When set up in this configuration the signal will be sent to the Master EDEX and then relayed to the slave boards to fire simultaneously. 

The IS200EDEXG2B board connects to an Exciter Auxiliary I/O Interface Board (EAUX) that will control the de-excitation on the EDEX board by opening a main contactor/breaker in the field circuit, the moment that this contactor/breaker is opened it will immediately set off a de-excitation command. 

The IS200EDEXG2B board is also used in the crowbar subsystem and is the primary board in the crowbar system. The crowbar and de-excitation functions are sometimes provided as a combined EDEX module. When you are operating this module the best manual to use would be the part-specific GEI-100466 manual but as it is hard to find at this time, the GEH-6781 EX2100e Excitation Control Users Guide also works well. 

The EDEXG2B might be mostly obsolete at this time due to no longer being in production but here at AX Control, we do whatever we can to attempt to get this board for you. If you have the board and it just needs repairs our team of specialists is equipped to do so. 

Reviews For IS200EDEXG2B

Internal Review

The IS200EDEXG2B model is used for de-excitation through the EAUX model, if the EAUX model fails as well as the EDEX model, a replacement is needed. Our team of specialists can do their best to help find a replacement or repair the board for you. - AX Control Tech Team

Repair Services For IS200EDEXG2B

Type Lead Time Price Action
Repair Service 1-2 weeks $2165

Our highly skilled technicians can repair your IS200EDEXG2B. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
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