Description
At-A-Glance Executive Brief
- Model: IS200ERDDH1A (ERDD, common rev: IS200ERDDH1ABB)
- Brand: GE General Electric
- Part Type: Exciter Regulator Dynamic Discharge Board (ERDD)
- Lifecycle status: OEM obsolete; stocked for brownfield EX2100 / EX2100e generator excitation cabinets
- System compatibility: GE Speedtronic Mark VI / Mark VIe, EX2100 excitation system, ERBP / ERRB backplanes
- Weight: 0.85 kg
Technical Introduction
Failure of the IS200ERDDH1A disables dynamic discharge and de-excitation crowbar control, risking uncontrolled DC-link overvoltage and inability to safely suppress generator field energy during trips or shutdown events. The IS200ERDDH1A ERDD board is a critical power interface card inside GE EX2100 static excitation systems. It bridges the low-level excitation controller logic and the high-power rectifier stack. The board implements IGBT gate drive, DC-link overvoltage dynamic discharge, field voltage and shunt current measurement, bridge temperature monitoring and crowbar/de-excitation relay control. It supports two operating configurations: simplex mode controls the K3 charging relay on ERBP backplane; redundant mode uses two ERDD boards (one on ERBP, one on ERRB) to operate the K41 de-excitation relay. It feeds field health status and fault diagnostics back to the Mark VI/VIe turbine controller and plant DCS. Combined-cycle, thermal and hydro power plant operators maintain spare ERDD boards to reduce forced outage risk while migrating legacy EX2100 excitation hardware.
- Best Suited For
- GE EX2100 / EX2100e generator static excitation cubicles
- Gas, steam and hydro generator field de-excitation, DC-link overvoltage protection and IGBT gate drive control
- Direct drop-in replacement for existing GE IS200ERDDH1A ERDD excitation hardware
Core Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | IS200ERDDH1A (ERDD; rev variant IS200ERDDH1ABB) |
| Platform | GE EX2100 / EX2100e Excitation, Mark VI / Mark VIe |
| Main Function | IGBT gate drive, DC-link dynamic discharge, generator field monitoring, de-excitation relay control |
| Max Field DC Voltage | 600 VDC |
| Continuous Discharge Current | 10 A |
| IGBT Rating | 1200 V, 50 A |
| Discharge Resistance | 60 Ω ±5% |
| Operating Modes | Simplex (ERBP) / Redundant (ERBP+ERRB dual board) |
| Sensing | Field voltage, shunt current, bridge temperature |
| Mounting | Rack mount to ERBP or ERRB backplane |
| Dimensions | 230 × 170 × 45 mm |
| Weight | 0.85 kg |
| Environmental Details | Please refer to the OEM datasheet for complete environmental tolerances. |
Field Engineer’s Tech Notes
- Confirm simplex or redundant cabinet architecture before replacement. Redundant installations require matching firmware and board revision on both ERDD units.
- This board connects to high DC field circuits. Execute full lockout/tagout, discharge capacitive energy and verify zero energy before card removal.
- ESD protection is mandatory when handling the PCB; static discharge can damage IGBT gate circuits and measurement channels.
- After replacement, verify field voltage/current feedback, IGBT gate status and de-excitation crowbar operation before returning the generator online.
Adaptive QA & Testing Protocol
Each IS200ERDDH1A board is bench tested with EX2100 excitation test fixture. We verify IGBT gate drive signals, dynamic discharge response under simulated DC-link overvoltage, field voltage and current sensing accuracy. Temperature monitoring and relay control outputs for K3/K41 are validated. Front panel status indicators and fault diagnostic reporting to Mark VI/VIe are checked. PCB visual inspection, solder joint and connector integrity are performed. Full test reports or bench test video clips are available upon request.
Buyer’s FAQ
Q: What is GE IS200ERDDH1A ERDD used for? A: It is the Exciter Regulator Dynamic Discharge board for GE EX2100 generator excitation systems. It provides IGBT gate drive, DC-link overvoltage discharge, field measurements and controls the de-excitation crowbar relay to safely dissipate generator field energy on trip.
Q: What warranty applies for refurbished and NSFP IS200ERDDH1A? A: Refurbished and NSFP units carry a 12-month hardware warranty. Coverage excludes ESD damage, high-voltage field transients, improper cabinet mode configuration and unapproved firmware revisions.
Q: What lead time should I expect? A: Stocked units ship 3–7 business days. If inventory is depleted, lead time increases while we source surplus GE EX2100 ERDD boards.
Q: Is IS200ERDDH1A hot-swappable? A: Not hot-swappable under live high DC field conditions. Generator and excitation system shutdown, isolation and capacitive discharge must be completed before replacement.
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