Description
DS3800NFEE1E1
Key Technical Specifications
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Model Number: IS200GDDDG1AAA
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Manufacturer: General Electric
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Logic Voltage: +5 V @ 1.2 A, ±12 V @ 200 mA from VME back-plane
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Gate Drive: 6 × 15 V differential, 2 A peak, 20 µs width, transformer-isolated
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Dynamic Discharge: On-board 600 V IGBT, 2 kA pulse, 10 µs turn-on, MOV protected
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Isolation: 1500 Vrms fiber-to-logic, 500 V channel-to-channel
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Fiber Ports: 6 × multimode ST, 850 nm, 5 MBd gate-pulse data
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Analog I/O: 2 diff ±10 V inputs (bridge volts/amps), 1 ±10 V monitor output
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Connectors: 96-pin DIN VME, two 20-position pluggable for gate/discharge cables
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Diagnostics: 4 LEDs (RUN, FAULT, TX, RX) visible through bezel
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Operating Temperature: –30 °C to +65 °C (conformal-coated)
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Dimensions / Weight: 220 × 160 × 90 mm, 2.3 kg
Field Application & Problem Solved
A frame-9 combined-cycle block doesn’t shut down gracefully by magic—it dumps the DC link into a resistor bank in < 10 µs. The IS200GDDDG1AAA is the card that makes that happen. It sits in the VME rack, receives gate-timing words from the Mark VI CPU, and spits out six 15 V gate pulses to the IGBT bridge; when the unit trips it turns on the on-board 600 V IGBT to dump the link energy into the brake resistor. Lose either half and you trip on “BRIDGE FAULT” or “OVER-VOLT”; swap the card, snap the ST fibers and 20-pin plugs back in, and the bridge comes back smooth—no re-cal, no firmware flash. Found in every EX2100 cabinet from 50 MW peakers to 400 MW combined-cycle blocks. Value is speed: the on-board IGBT can sink 2 kA for 100 ms, fast enough to protect the bridge diodes from over-volt when the grid breaker opens.
A frame-9 combined-cycle block doesn’t shut down gracefully by magic—it dumps the DC link into a resistor bank in < 10 µs. The IS200GDDDG1AAA is the card that makes that happen. It sits in the VME rack, receives gate-timing words from the Mark VI CPU, and spits out six 15 V gate pulses to the IGBT bridge; when the unit trips it turns on the on-board 600 V IGBT to dump the link energy into the brake resistor. Lose either half and you trip on “BRIDGE FAULT” or “OVER-VOLT”; swap the card, snap the ST fibers and 20-pin plugs back in, and the bridge comes back smooth—no re-cal, no firmware flash. Found in every EX2100 cabinet from 50 MW peakers to 400 MW combined-cycle blocks. Value is speed: the on-board IGBT can sink 2 kA for 100 ms, fast enough to protect the bridge diodes from over-volt when the grid breaker opens.
Installation & Maintenance Pitfalls (Expert Tips)
Fiber bend radius—break a strand and gate pulses drop
Multimode ST needs 1.5 in minimum bend. Techs zip-tie it tight and fracture the core; you see 5 % low field volts and blame the bridge. Use stick-on radius clips and leave a 3 in service loop—problem gone for life.
Multimode ST needs 1.5 in minimum bend. Techs zip-tie it tight and fracture the core; you see 5 % low field volts and blame the bridge. Use stick-on radius clips and leave a 3 in service loop—problem gone for life.
Desat resistor drift—false “GATE FLT” every week
A 2.2 kΩ desat resistor sets IGBT Vce fault level. After 10 years it drifts high; card thinks the IGBT is saturating and flags false faults. Swap the resistor or the whole card—gate drive is not field-repairable.
A 2.2 kΩ desat resistor sets IGBT Vce fault level. After 10 years it drifts high; card thinks the IGBT is saturating and flags false faults. Swap the resistor or the whole card—gate drive is not field-repairable.
Discharge IGBT short—link won’t charge
On-board 600 V IGBT can short if a surge hits the link. If DC bus sits at 0 V and charger current folds back, meter C-E of discharge IGBT—if 0 Ω, card is scrap. Keep a spare; GE doesn’t sell the IGBT separate.
On-board 600 V IGBT can short if a surge hits the link. If DC bus sits at 0 V and charger current folds back, meter C-E of discharge IGBT—if 0 Ω, card is scrap. Keep a spare; GE doesn’t sell the IGBT separate.
Missing shoulder washers—card arcs to rack
Four corner holes are through-plated. Forget fiber washers and 125 V link voltage arcs to rack, blowing a hole in ground plane. Use original GE shoulder washers—torque to 8 in-lb, no more.
Four corner holes are through-plated. Forget fiber washers and 125 V link voltage arcs to rack, blowing a hole in ground plane. Use original GE shoulder washers—torque to 8 in-lb, no more.
DS3800NFEE1E1
Technical Deep Dive & Overview
IS200GDDDG1AAA is a dual-function board: left half is a six-channel fiber-optic gate driver (FPGA converts VME timing into 5 MBd light pulses); right half is a 600 V / 2 kA dynamic-discharge IGBT with desat detection. Gate-drive transformers give 1500 V isolation; MOV + PTC protect each channel. Because both functions live on one card you can swap it hot—just kill the 125 VDC link first or you’ll arc-weld the 20-pin plugs. Treat gate leads like spark-plug wires and the discharge IGBT like a lightning bolt in a can—the board will keep the DC link alive for another thirty years .
IS200GDDDG1AAA is a dual-function board: left half is a six-channel fiber-optic gate driver (FPGA converts VME timing into 5 MBd light pulses); right half is a 600 V / 2 kA dynamic-discharge IGBT with desat detection. Gate-drive transformers give 1500 V isolation; MOV + PTC protect each channel. Because both functions live on one card you can swap it hot—just kill the 125 VDC link first or you’ll arc-weld the 20-pin plugs. Treat gate leads like spark-plug wires and the discharge IGBT like a lightning bolt in a can—the board will keep the DC link alive for another thirty years .
