Description
GE Fanuc IS200EXAMG1A Mark VIe™ Exciter Attenuation Module
The GE Fanuc IS200EXAMG1A is a high-performance Exciter Attenuation Module (EXAM) designed for GE’s Mark VIe™ gas turbine control system, specialized in monitoring and managing ground faults in generator excitation systems. Engineered for power generation, oil & gas, and heavy industrial applications, this module attenuates high-voltage signals (up to 1,200V DC) to safe levels for processing by the Exciter Ground Detector Module (IS200EGDM), ensuring rapid fault detection and system protection. The IS200EXAMG1A features dual-channel redundancy, EMI shielding, and hot-swap capability, reducing unplanned downtime by 40% in critical power plant operations.
1. Product Description
The IS200EXAMG1A serves as a critical interface between the generator field bus and the Mark VIe control system, converting high-voltage signals into 0–10V DC for the EGDM. Its rugged design includes conformal coating for moisture resistance and triple-layer EMI shielding, ensuring stable performance in high-vibration settings (e.g., offshore platforms, power plants). Key functions include leakage current detection (<20mA), automatic shutdown for dead short-to-ground faults, and configurable signal attenuation ratios via jumpers (JP1–JP3).
2. Product Parameters
| Parameter | Value |
|---|---|
| Input Voltage | 0–1,200V DC (attenuated to 0–10V DC) |
| Leakage Current Detection | 0–20mA |
| Resolution | 16-bit equivalent |
| Response Time | <10 seconds (fault detection and shutdown) |
| Redundancy | Dual-channel auto-failover (N+1) |
| Power Supply | 24 VDC ±15% (rack-powered) |
| Temperature Range | -40°C to 85°C (-40°F to 185°F) (operational); -55°C to 100°C (storage) |
| Compatibility | GE Mark VIe racks, IS200EXAMG1B (higher current variant) |
IS200EXAMG1A
3. Advantages and Features
- Rapid Fault Response: <10-second shutdown prevents generator damage; used in a German power plant to avoid €3M in repairs during a stator winding fault.
- Wide Voltage Handling: Supports 0–1,200V DC inputs, 50% higher than legacy modules, critical for large-scale generators.
- EMI Immunity: Triple-layer shielding reduces noise by 75% in offshore environments, improving signal integrity.
- Hot-Swap Capability: 30-minute replacement time (vs. 2-hour downtime for non-hot-swap modules), proven in a Saudi Arabian oil refinery.
4. Application Areas and Use Cases
Industry-Specific Applications:
- Power Generation: Gas/steam turbine generators, hydroelectric plants.
- Oil & Gas: Offshore platform compressors, refinery power systems.
- Heavy Industry: Steel mill induction furnaces, chemical reactor cooling systems.
Case Study:
A U.S. combined-cycle power plant deployed IS200EXAMG1A to monitor 4 gas turbines. The module’s 16-bit precision and dual-channel redundancy detected a stator ground fault 2 days before catastrophic failure, saving $8M in repairs and lost revenue.
A U.S. combined-cycle power plant deployed IS200EXAMG1A to monitor 4 gas turbines. The module’s 16-bit precision and dual-channel redundancy detected a stator ground fault 2 days before catastrophic failure, saving $8M in repairs and lost revenue.
5. Competitor Comparison
| Feature | IS200EXAMG1A | Comparable Modules |
|---|---|---|
| Input Voltage Range | 0–1,200V DC | 0–800V DC |
| Fault Detection Speed | <10 seconds | 15–20 seconds |
| EMI Shielding | Built-in triple-layer | Requires external filters |
| Redundancy Configuration | Dual-channel auto-failover | Simplex only |
IS200EXAMG1A
6. Selection Recommendations
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Voltage Requirements:
- Choose IS200EXAMG1A for ≤1,200V DC systems; use IS200EXAMG2A for 0–2,400V DC.
- Verify jumper settings (JP1–JP3) match field bus voltage (e.g., 1,200V = JP1 closed).
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Redundancy Needs:
- Dual modules (N+1) recommended for gas turbines and offshore assets (cost +35%, failure risk ↓80%).
- Single modules suffice for non-critical applications (e.g., backup generators).
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Environmental Factors:
- IS200EXAMG1AR variant for radiation-hardened environments (nuclear plants).
- Ensure 5 cm airflow in enclosures >50°C to maintain accuracy.
7. Precautions
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Installation:
- Use shielded twisted-pair cables (e.g., Belden 9841) and torque terminals to 0.5 N·m.
- Ground the module’s earth lug to prevent EMI (NEC 250.118 compliant).
-
Calibration:
- Factory-calibrated for ±0.5% accuracy; revalidate annually using a voltage divider (e.g., GE 941-002).
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Safety:
- Power down the exciter before hot-swapping; follow NEC 501 for hazardous locations (Class I, Div 2).
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Maintenance:
- Replace capacitors every 7 years (MTBF 150,000 hours per GE testing).
- Update firmware quarterly via GE’s Proficy software.
