WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | DS200EXDEG1A |
| Manufacturer | General Electric (GE) |
| Product Type | De-Excitation Control Board (EXDE) |
| Series | EX200 Exciter / Mark V DS200 |
| Connector Type | 34-pin connector (two 34-pin connectors) |
| Terminal Block | 12 terminals |
| Power Supply | 240 Vdc |
| Operating Temperature | 0°C to 65°C |
| Weight | 2.00 lbs (0.91 kg) |
| Size | 9.2 in × 6.5 in (23.4 cm × 16.5 cm) |
| Country of Origin | USA |
| Manual | GEI-100195 |
| LED Indicators | 5 LED indicators |
| Additional Connectors | Two 10-pin connectors |
| Capacitors | 8 capacitors on board |
| SCR Size | Supports 53 mm or 77 mm SCR |
| Control Circuits | 2 separate control circuits (circuit 1 and circuit 2) |
Product Introduction
GE DS200EXDEG1A is a De-Excitation Control Board (EXDE) for the EX200 Exciter series used in GE excitation turbine control systems. It serves as the main PCB on exciters and the CV2000 Cycloconverter in the De-Excitation Module.
The De-Excitation Module removes energy from the generator field during normal or emergency shutdowns, limits voltage across the generator field when the field breaker opens, and limits energy dissipated in contactors. The EXDE board contains thyristor and gate control logic to fire either a 53 mm SCR or 77 mm SCR based on control inputs or break-over voltage.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Generator field does not de-energize during shutdown | EXDE board firing logic failure or SCR not firing | ✅ High | Measure 24 Vdc control signal at 1TB-1/1TB-2 (circuit 1) and 4TB-1/4TB-2 (circuit 2) | Replace EXDE board if firing pulse is missing |
| Field breaker contactor damaged or welded | EXDE board not limiting voltage during field breaker opening | ✅ High | Check voltage across field terminals during shutdown with oscilloscope | Replace EXDE board if voltage exceeds spec |
| SCR fails to fire despite control signal | Gate control logic failure or BOD (break-over diode) fault | ✅ High | Measure gate current at SCR anode; check BOD jumper configuration (E7A-E7B-E12) | Verify jumper settings, replace board if gate current is zero |
| Multiple parallel SCRs not firing in sync | EXDE board synchronization pulse failure | ✅ High | Check firing pulse timing on oscilloscope across parallel SCR boards | Replace EXDE board if pulses are not synchronized |
| Conduction sensor reports no current flow despite load | Conduction Sensor Board fault or Hall Effect sensor failure | ❌ Medium | Check JCX/JCY connector voltage (12 Vdc power); measure Hall sensor output | Replace Conduction Sensor Board first, then EXDE if fault persists |
| Board shows no LED activity despite power | Power supply failure or board internal fault | ✅ High | Measure 240 Vdc at input terminals; check fuses | Replace power supply if voltage is present but LEDs are off |
If you are stuck, send photos of the board, LED status, connector pins, jumper settings, and diagnostic logs to technical support.
- DS200EXDEG1A
Frequently Asked Questions
Q: What is GE DS200EXDEG1A?
A: It is a GE EX200 De-Excitation Control Board (EXDE) used in excitation turbine control systems. The board fires SCRs to remove energy from the generator field during shutdown and limits voltage across the field when the breaker opens.
Q: Is this a direct replacement?
A: Only if your existing system uses DS200EXDEG1A in the same EX200/Mark V configuration. Always match the exact part number and verify SCR size (53 mm or 77 mm), jumper settings, and connector type before installation.
Q: Is it new, used, or refurbished?
A: This listing is positioned as New Surplus / NNB (New Never Installed)—unused inventory from prior stock. Condition should be clearly stated, and testing status should be confirmed with the seller.
Q: Can I install it without changing anything else?
A: Often yes, but do not assume that. Check the original board’s jumper configuration (BOD and current-limiting resistor jumpers), SCR size, and wiring. The EXDE board’s anode firing voltage is selectable via wire jumpers.
Q: What should I check before swapping the board?
A: Photograph the old board’s jumper settings (E7A-E7B-E12 for BODs, E1B-E2-E6/E1C for resistors), note the SCR size, verify power is off, and check the Conduction Sensor Board condition. A bad swap often starts with mismatched jumper settings.
Q: Why does this board have two control circuits?
A: The EXDE board provides two separate control circuits (circuit 1 and circuit 2), each with three terminal boards. This allows multiple EXDE boards to fire parallel SCRs with synchronized firing pulses for redundancy and higher current capacity.
A: Surplus pricing reflects secondary-market sourcing, limited availability, and older inventory. The lower price does not mean it is the same as factory-new sealed stock, so testing and condition must be transparent.
Q: Does this part come with a warranty?
A: Warranty terms depend on the seller. For B2B buyers, confirm testing status, return terms, and whether a test report is included. Typical industrial surplus listings offer 1-year warranty on tested units.
