The GE IS200EDEXG1A IS200EDEXG1AFA exciter de-excitation board safely discharges generator field energy during faults. This board provides a rapid discharge path for the exciter field winding. You will find this de-excitation board in GE Mark VI excitation control systems. Its fail-safe design ensures generator protection during emergency shutdowns.
De-Excitation Architecture
This de-excitation board monitors the exciter field voltage continuously. Consequently, it triggers the discharge circuit when the controller commands shutdown. The GE IS200EDEXG1A IS200EDEXG1AFA uses redundant thyristors for high reliability. Moreover, a hardware watchdog supervises all critical functions. You can configure trip levels without modifying the board hardware.
Technical Specifications
| Parameter | Value |
|---|---|
| Input Voltage | 250V DC maximum (field voltage) |
| Discharge Current | 50A peak, 10A continuous |
| Trip Inputs | 2 (redundant, 24V DC logic) |
| Trip Outputs | 2 relay, form C, 250V AC/30V DC, 5A |
| Trip Response Time | 5 ms maximum |
| Discharge Resistance | 5 Ω (internal) |
| Dimensions | 210mm x 160mm x 35mm |
| Weight | 0.72 kg (1.59 lbs) |
| PCB Layers | 6 |
| Onboard Components | 4 thyristors, 2 relays, 1 watchdog, 2 optocouplers |
| Connector Count | 5 (field input, trip input, relay output, power, backplane) |
| Status Indicators | 4 LEDs (active, tripped, power, fault) |
| Energy Storage | 2200 µF (control power filtering) |
| Isolation Voltage | 2500V (field to logic) |
| Operating Temperature | -10°C to +55°C |
| Storage Temperature | -25°C to +70°C |
Redundant Triggering and Safety Features
The unit includes two independent trip input channels for redundancy. Therefore, a single channel failure does not prevent de-excitation. This board replaces the IS200EDEXG1AFA version without any wiring changes. Simply remove the old board and install this one. GE designed this de-excitation board for single-slot installation. Hence, it fits directly into existing Mark VI rack positions.
Six PCB layers separate high-voltage field traces from logic circuits. Five connectors handle all field, trip, relay, and power signals. The GE IS200EDEXG1A IS200EDEXG1AFA includes a hardware watchdog for continuous self-checking. Accordingly, it detects internal faults and alerts the main controller. Four status LEDs show active, tripped, power, and fault conditions clearly.
Installation and Testing Guide
The board performs a self-test on power-up to verify all circuits. Any self-test failure will illuminate the fault LED immediately. The GE IS200EDEXG1A IS200EDEXG1AFA works with all GE Mark VI excitation systems. Always verify the discharge resistor rating before installation. Proper shielding of trip input cables prevents false triggering from noise.
The internal discharge resistor dissipates stored field energy safely. The board includes thermal protection for continuous discharge duty. The GE IS200EDEXG1A IS200EDEXG1AFA provides reliable generator protection during faults. Installation requires only a screwdriver for field and relay connections. This board meets applicable safety standards for excitation systems.
Details
| Weight | 0.1 kg |
|---|---|
| Dimensions | 25 × 108 × 127 mm |
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