Description
DS3800NVIA1G1D Product Overview
The DS3800NVIA1G1D is a voltage-isolator board used inside GE Mark IV turbine and EX2000 exciter control racks. Occupying a 6BA05 Euro-card slot, it acts as the analog “front end” between field transducers and the 5 V CPU: it accepts ±10 V or 4–20 mA signals, provides 1500 Vdc group isolation, buffers the result to the NDIA data bus, and clamps incoming surges with on-board MOVs. Because all copper traces are fully encapsulated in high-temperature epoxy, the unit is treated as a line-replaceable module—any internal fault requires a complete card swap rather than component-level rework. The module is fully hot-swappable when the rack is powered down, and its 0.20 kg weight allows adjacent-slot population without additional cooling.
The DS3800NVIA1G1D is a voltage-isolator board used inside GE Mark IV turbine and EX2000 exciter control racks. Occupying a 6BA05 Euro-card slot, it acts as the analog “front end” between field transducers and the 5 V CPU: it accepts ±10 V or 4–20 mA signals, provides 1500 Vdc group isolation, buffers the result to the NDIA data bus, and clamps incoming surges with on-board MOVs. Because all copper traces are fully encapsulated in high-temperature epoxy, the unit is treated as a line-replaceable module—any internal fault requires a complete card swap rather than component-level rework. The module is fully hot-swappable when the rack is powered down, and its 0.20 kg weight allows adjacent-slot population without additional cooling.
DS3800NVIA1G1D
DS3800NVIA1G1D Technical Specifications
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Model Number: DS3800NVIA1G1D
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Manufacturer: General Electric (GE Fanuc)
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Product Type: Voltage Isolator / Analog Signal Interface Board
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Series: DS3800, Mark IV Speedtronic
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Form Factor: 6BA05 Euro-card (≈ 233 × 160 mm)
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Daughter-Card Mate: DS3800DSWA terminal block (screw-clamp landing)
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Input Range: ±10 V or 4–20 mA (jumper-selectable)
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Isolation: 1500 Vdc channel-to-ground; group-isolated
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Surge Protection: 40 mm MOVs, integral with board traces
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Operating Temperature: 0 – 60 °C
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Weight: 0.20 kg (0.44 lb)
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Construction: Epoxy-sealed copper traces—non-repairable
Core Features & Customer Value
Group-Isolated Analog Inputs: The on-board isolation amplifiers accept ±10 V or 4–20 mA on the same terminal strip. For the control engineer this eliminates external signal conditioners and ground-loop errors, reducing wiring complexity and spare-part count.
Epoxy-Sealed Construction: All internal copper is encapsulated in high-temperature epoxy. In coastal or industrial sites with conductive dust and high humidity the seal prevents trace-to-trace shorting that would otherwise cause random “VOLTAGE ISOLATOR FAIL” alarms after ten-plus years of service. The trade-off is non-repairability—any internal fault requires a whole-card exchange—but this is offset by reduced troubleshooting time and the fact that plants stock one spare instead of maintaining a repair bench.
Made-in-USA Supply Chain: The board is manufactured in the United States, ensuring traceability and long-term spares availability for critical infrastructure sites that must comply with domestic-content or Buy-American provisions.
DS3800NVIA1G1D
Typical Applications
In combined-cycle power plants the board is installed in the Mark IV turbine control core where it lands isolated ±10 V signals from exhaust-temperature transmitters and 4–20 mA from compressor-discharge pressure transmitters. The on-board opto-isolators keep 480 V switching transients from walking into the 5 V CPU data bus.
On utility-scale EX2000 static exciters the same card is used to isolate the brushless-exciter field-current transmitter (4–20 mA) and the diode-fail analog output. Because the inputs are group-isolated, a shorted transducer will not drag down the entire analog I/O rack.
Frequently the same part number is used on mechanical-drive gas compressors to land the 4–20 mA inlet-pressure transmitter and the ±10 V guide-vane position feedback. Its ability to mix voltage and current signals on one card makes it a universal “voltage isolator” for any Mark IV loop that needs deterministic, ground-loop-free operation.
