GE IS200EGDMH1AFG – Exciter Ground Detector Module | Mark VI / EX2100 Platform
Engineering Background: The IS200EGDMH1AFG is a dedicated ground fault detection board developed by GE as part of its EX2100 / Mark VI excitation control architecture. It continuously monitors the rotor and field winding circuits for ground faults, providing real-time isolation resistance measurement and alarm/trip signal output to the main exciter controller. This module is critical for protecting generator rotor insulation and preventing catastrophic winding failures in utility-scale and industrial power generation assets.
Product Positioning: Designed for procurement engineers and plant maintenance teams operating GE Mark VI or EX2100 excitation systems, the IS200EGDMH1AFG is a direct OEM replacement board. Konmask.com stocks verified units sourced through authorized industrial channels, supporting both emergency replacement and planned maintenance outages.
Complete Technical Specifications
| Part Number | IS200EGDMH1AFG |
| Manufacturer | GE (General Electric) |
| Series / Platform | EX2100 / Mark VI Excitation Control |
| Module Function | Exciter Ground Detector Module |
| Detection Method | AC injection-based rotor ground fault detection |
| Measurement Range | Isolation resistance monitoring (field circuit to ground) |
| Output Signals | Alarm relay, Trip relay, Analog resistance output to controller |
| Communication Interface | Backplane I/O via Mark VI VME-style rack |
| Operating Voltage | Supplied via exciter rack backplane (typically ±15 VDC, +5 VDC) |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) |
| Form Factor | PCB module, rack-mount card |
| Weight | 1,300 g (approx.) |
| Revision | H1AFG |
| Condition | New / Surplus New / Tested Refurbished (specify on inquiry) |
| Country of Origin | USA |
Proven Application Environments
- Gas Turbine Generators — GE Frame 6B, 7E, 7F, 9E, 9F series with EX2100 excitation
- Steam Turbine Generators — Combined-cycle and coal-fired plants using Mark VI exciter control
- Hydro Generators — Large hydro units with GE EX2100 static excitation systems
- Industrial Power Plants — Refinery, petrochemical, and LNG facility captive power generation
- Utility Grid Assets — Transmission-connected generators requiring continuous rotor ground monitoring
Engineering Advantages
- Continuous Online Monitoring — Detects first ground faults without taking the machine offline, enabling condition-based maintenance planning
- High Sensitivity — AC injection method provides accurate low-resistance fault detection even under noisy field circuit conditions
- Dual-Level Protection — Independent alarm and trip thresholds allow staged response: alert operators before initiating a forced shutdown
- Seamless Mark VI Integration — Native backplane communication eliminates signal conditioning hardware; plug-and-play replacement within the exciter rack
- Rotor Insulation Life Extension — Early fault detection prevents progressive insulation degradation, reducing unplanned outage risk
- Compact PCB Design — Single-slot card minimizes rack space while delivering full ground detection functionality
System Architecture & Signal Flow
Within the EX2100 / Mark VI excitation rack, the IS200EGDMH1AFG interfaces directly with the field winding circuit via high-voltage isolation circuitry. The module injects a low-level AC test signal across the field circuit-to-ground path and measures the resulting current to calculate isolation resistance. The computed resistance value is transmitted to the Mark VI exciter controller (typically the EGDM or ESEL board set) via the rack backplane. When resistance falls below the configured alarm threshold, the module asserts an alarm relay; a further drop to the trip threshold triggers the trip relay, which the Mark VI controller uses to initiate a controlled generator shutdown sequence.
Signal flow summary: Field Circuit → IS200EGDMH1AFG Injection & Measurement → Backplane → Mark VI Controller → Alarm/Trip Output → Generator Protection Relay
Sourcing & Quality Verification
- Source Traceability — Units sourced from OEM-authorized distributors, decommissioned plant spares, or factory surplus; full chain-of-custody documentation available on request
- Incoming Inspection — Visual inspection, PCB integrity check, and component-level verification performed before listing
- Functional Test — Refurbished units undergo bench-level power-on and signal output verification against GE IS200EGDMH1AFG reference specifications
- ESD-Safe Packaging — All boards shipped in anti-static bags with foam cushioning and moisture barrier packaging
- Warranty — 12-month warranty against manufacturing defects; exchange program available for core returns
- Export Compliance — ECCN classification and export documentation provided for international shipments
Procurement Process
- Submit Inquiry — Email support@konmask.com or call +0086 19859288691 with your part number, required quantity, and delivery timeline
- Receive Quote — Konmask responds within 24 hours with pricing, lead time, and available condition grades
- Order Confirmation — Confirm PO; payment via T/T bank transfer, PayPal, or credit card (USD/HKD accepted)
- Quality Hold & Dispatch — Final inspection completed; unit dispatched via DHL / FedEx with tracking and commercial invoice
- After-Sales Support — Technical support available for installation verification and Mark VI system integration questions
Technical FAQ
Q: Is the IS200EGDMH1AFG compatible with both EX2100 and Mark VI excitation systems?
A: Yes. The module is designed for GE’s EX2100 static excitation platform, which uses the Mark VI control architecture. It is compatible with all Mark VI-based exciter racks that include the EGDM ground detection slot.
Q: What is the difference between revision H1AFG and other IS200EGDMH1 revisions?
A: The suffix (e.g., H1AFG vs. H1A) denotes hardware revision and conformal coating specification. H1AFG indicates a specific PCB revision with enhanced conformal coating for humidity resistance. Always verify the exact revision with your GE system documentation before ordering.
Q: Can this module be used as a direct drop-in replacement without reconfiguration?
A: In most cases, yes — the IS200EGDMH1AFG is a plug-in replacement within the same rack slot. However, alarm and trip threshold parameters are configured in the Mark VI Toolbox software and should be verified after replacement to match site-specific protection settings.
Q: Do you provide a test report with the module?
A: Yes. A functional test report is available for refurbished units. New/surplus units include OEM documentation where available. Contact us to specify your documentation requirements at time of order.
Q: What is the typical lead time?
A: In-stock units ship within 2–5 business days. For units requiring sourcing or refurbishment, lead time is typically 2–4 weeks. Emergency expedite service is available — contact us directly.
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