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3 year warranty

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Exciter De-Excitation Module part IS200EDEXG1B is a bridge and protection board that can initiate de-excitation processes if other controls on the model fail. This board is a group one board model which is specifically used for SCR de-excitation.



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  • Part Number: IS200EDEXG1B
  • Manufacturer: GE Industrial Systems
  • Series: EX2100 Excitation Control

IS200EDEXG1B Technical Specifications

Board Description De-Excitation Bridge and Protection Board
Configurable Jumpers JP1, JP2, JP3, JP4, JP5, JP6
Connections 2, D-Pin Connectors
Manual GEH-6632
Series Innovation Series, EX2100
Weight 3 lbs. 6 oz.

Product Description

This model is located in an auxiliary cabinet and has a silicon-controlled rectifier (SCR) de-excitation mode. In the SCR de-excitation module, the SCR is fired when a conduction path is needed, once the SCR has been fired it will make a path through the field discharge inductor and will allow the field current to flux and disperse the field energy. If for any reason the SCR is not able to be fired then it will fire on overvoltage, firing on overvoltage will occur when the anode to gate voltage surpasses the break overvoltage of the break-over diode string which is connected between the gate and anode functions. 

The GEH-6632 EX2100 Excitation Control User’s Guide is the best manual to use for information on the installation and function of the IS200EDEXG1B model.

Frequently Asked Questions about IS200EDEXG1B

How does the IS200EDEXG1B board work?

The EDEX board is connected to a number of boards, one of them being the EMIO board, which will initiate de-excitation. The attached EXTB board will open the 41 DC breakers and transfer de-excitation signals from the auxiliary contacts to SCR firing circuits within the EDEX board. 

Where does the power needed to supply the IS200EDEXG1B module come from?

The power supply of the IS200EDEXG1B module comes from the EPSM module. 

What is the primary function of the IS200EDEXG1B module?

The primary function of the IS200EDEXG1B board is to dissipate the stored energy of the generator field inductance. 

The IS200EDEXG1A board has Hall effect conduction sensors. Does the IS200EDEXG1B board also have Hall effect conduction sensors?

Yes the IS200EDEXG1B board also has Hall effect conduction sensors, which are mounted in the air gap of a circular steel core. 

Reviews For IS200EDEXG1B

Internal Review

The IS200EDEXG1B model is great for uses of SCR de-excitation, but this module has a potential issue when it comes to not firing the SCR when it is needed - AX Control Technician

Repair Services For IS200EDEXG1B

Type Lead Time Price Action
Repair Service 1-2 weeks $1120

Our highly skilled technicians can repair your IS200EDEXG1B. 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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