GE IS200EGDMH1AFF Exciter‑Field‑Ground‑Detector Module (EGDM)

Description

Hardware & Electrical Specifications

• Model：IS200EGDMH1AFF
• Part Number：IS200EGDMH1AFF
• Module Type：Exciter‑Field‑Ground‑Detector Module (EGDM)
• Form factor：Double‑slot plug‑in module for EPBP backplane rack
• Power supply：+12 V / +28 V DC supplied by exciter‑power backplane
• Detection function：Measure field‑circuit insulation resistance, identify AC‑side / DC‑side ground leakage fault
• Interface：P1/P2 backplane connectors, fiber‑optic link to DSPX board; relay fault output contact
• PCB treatment：Conformal coated for dust‑moisture‑corrosion resistance
• On‑board components：High‑voltage capacitors, precision measuring resistors, fault‑output relay
• On‑board protection：Over‑voltage surge suppression, high‑voltage isolation circuit
• Compatibility note：Cannot run standalone; dedicated for GE EX2100 excitation system; jumper / pin setting must match simplex / TMR redundancy mode; full‑function ground‑fault simulation test required after replacement.

Environmental Specifications

• Operating temperature：‑40 ℃ ~ +70 ℃
• Storage temperature：‑40 ℃ ~ +85 ℃
• Relative humidity：5%‑95% non‑condensing
• Installation location：Excitation control cabinet EPBP rack
• EMC compliance：IEC 61000‑6‑2
• Certifications：CE

Mechanical Data

• Weight：approx 0.43 kg (1lb 3oz)
• Dimension：228 mm(H) ×152 mm(D) ×38 mm(W) (9″×6″×1‑1/2″)
• Handling note：ESD‑sensitive PCB; contains high‑voltage measuring circuit, anti‑static operation mandatory
• Recommended wire cross‑section：0.75‑2.5 mm² copper cable for field excitation‑monitoring wiring
• Terminal tightening torque：0.6‑1.0 N·m

Main Functions

1. Apply measuring excitation voltage to generator field circuit, calculate insulation resistance value of field winding and field cables.
2. Detect ground‑leakage fault both on AC rectifier side and DC field‑winding side of excitation loop.
3. Exchange fault‑diagnosis data with DSPX controller via fiber‑optic communication link.
4. Hardware relay output for field‑ground‑fault alarm signal to turbine protection logic.
5. Support simplex / TMR triple‑modular‑redundant configuration by backplane pin‑setting.
6. On‑board self‑diagnosis: detect module power failure, measuring circuit abnormality, report fault status.
7. Front‑panel LED status indication:
   • Green LED：Module power supply normal
   • Yellow LED：Measuring circuit active, fiber‑link communication ok
   • Red LED：Field‑circuit ground‑fault / module hardware fault

Installation & Wiring Requirements

1. Cut off exciter‑rack power supply before replacement. Hot‑swap is forbidden. Take anti‑static protection when handling PCB board.
2. Insert module fully into designated EPBP rack slot; confirm reliable backplane connector contact.
3. Verify backplane pin‑configuration matches system redundancy mode (simplex / TMR).
4. Field excitation‑monitoring wiring strictly follow GE EX2100 wiring manual GEI‑100467; separate high‑voltage measuring cables from low‑signal control cables.
5. Complete protective grounding according to GE Speedtronic system specification.
6. After replacement: perform insulation‑detection calibration, simulate ground‑fault test, verify alarm & trip‑logic response before commissioning.
7. Replacement note: Confirm redundancy‑mode pin‑setting; cannot directly swap without function verification.