Features:
- Provides two independent SCR firing-control paths.
- Detects field-discharge conduction through separate Hall effect sensor circuits.
- Retains firing capability during a control-power interruption.
The field-discharge SCR conducts after field polarity reverses, allowing stored energy to move through the discharge resistor or inductor.
EXHS transfers the de-excitation request after the 41 contactor or breaker opens.
A crowbar arrangement uses the same board architecture to limit negative field voltage during a pole-slip event.
Apter Power can support quotation and documentation requests for the General Electric IS200EDEXG1B Exciter De-Excitation Board used in GE EX2100 field-discharge circuits.
General Electric IS200EDEXG1B Exciter De-Excitation Board Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
How IS200EDEXG1B starts field discharge
- Parallel inputs: Either normal control input can request SCR firing.
- Command level: A P24 V signal is delivered to both firing-control circuits.
- Gate action: Both circuits issue pulses to the de-excitation SCR gate.
- Conduction condition: Current begins after the field voltage has reversed polarity.
Reading IS200EDEXG1B conduction feedback
- Sensor method: Hall effect elements detect the magnetic field around the discharge-current path.
- Circuit separation: Two sensor circuits provide independent feedback channels.
- Core position: Each sensor operates in the air gap of its circular steel core.
- Successful action: Feedback from either channel confirms that field discharge has occurred.
Independent backup action in IS200EDEXG1B
- Voltage response: The backup path watches SCR anode-to-cathode voltage.
- Selected limit: Firing begins after voltage crosses the configured breakover level.
- Failure coverage: This path remains available if both commanded firing circuits fail.
- Power retention: Stored control energy supports the protection sequence during supply loss.
Master and slave use of IS200EDEXG1B
- Large exciters: Several de-excitation modules can operate as one coordinated group.
- Master role: One EDEX board receives the external firing-control request.
- Slave command: The master relays that request to the remaining modules.
- Simultaneous action: All connected discharge SCRs are fired together.