Description
DS3800NCID1C1C: Product Overview
This board occupies a 6BA05 Euro-card slot in GE Mark IV turbine and EX2000 exciter control racks, serving as a dedicated current loop interface between field transmitters and the central processor. It accepts 4–20 mA signals from pressure, temperature, or flow transmitters, provides 1500 Vdc group isolation to protect the 5 V CPU from ground loops and high-voltage transients, and buffers the conditioned signals to the NDIA data bus. On-board 40 mm MOVs clamp lightning-induced surges at the field entry point.
This board occupies a 6BA05 Euro-card slot in GE Mark IV turbine and EX2000 exciter control racks, serving as a dedicated current loop interface between field transmitters and the central processor. It accepts 4–20 mA signals from pressure, temperature, or flow transmitters, provides 1500 Vdc group isolation to protect the 5 V CPU from ground loops and high-voltage transients, and buffers the conditioned signals to the NDIA data bus. On-board 40 mm MOVs clamp lightning-induced surges at the field entry point.
The “C1C” revision indicates C-ESS essential-service qualification, meaning the board has passed extended thermal-cycle and surge testing for critical infrastructure duty. The epoxy-sealed construction makes this a line-replaceable module—internal faults require complete card swap rather than field repair. The module hot-swaps when the rack is powered down, and its low profile allows adjacent-slot population without additional cooling. As part of the DS3800 family, it benefits from the Mark IV platform’s deterministic 2 ms control interval and extensive installed base in power generation applications.
GE DS3800NGRC1F1F
DS3800NCID1C1C: Technical Specifications
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Model Number: DS3800NCID1C1C
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Manufacturer: General Electric (GE Fanuc)
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Product Type: Current Isolator / Analog I/O 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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Assembly Code: C-ESS (essential-service qualified)
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Back-Plane Connector: Dual 40-pin header (J1/J2)
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Input/Output Range: 4–20 mA (jumper-selectable input or output per channel)
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Isolation: 1500 Vdc channel-to-ground; group-isolated
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Update Rate: 2 ms (synchronized to CPU scan)
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Accuracy: ±0.1 % of span (typical)
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Surge Protection: 40 mm MOVs, integral with board traces
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Power Demand: +5 V @ 0.6 A, ±15 V @ 0.2 A from rack 2PL bus
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Operating Temperature: 0 – 60 °C
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Weight: ≈ 0.25 kg
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Construction: Epoxy-sealed copper traces—non-repairable
Core Features & Customer Value
Dedicated Current Loop Isolation: The board is optimized for 4–20 mA signals—the industrial standard for process transmitters. For control engineers, this provides predictable loop behavior with 250 Ω burden resistors and HART-compatible bandwidth, eliminating the need for external signal conditioners or custom scaling.
C-ESS Essential-Service Qualification: The C1C revision carries extended qualification testing beyond standard commercial grades. For plant owners, this provides confidence that the card will survive decades of daily thermal cycling and electrical stress in peaker plants or base-load units without degradation.
Epoxy-Sealed Construction: All internal copper is encapsulated in high-temperature epoxy. In coastal or industrial environments with conductive dust and high humidity, this prevents trace-to-trace shorting that would cause random “CURRENT LOOP FAIL” alarms after ten-plus years. The trade-off is non-repairability—internal faults require whole-card exchange—but this is offset by reduced troubleshooting time and single-spare stocking rather than maintaining a repair bench.
GE DS3800NGRC1F1F
Typical Applications
In combined-cycle power plants, this board installs in the Mark IV turbine control core to isolate 4–20 mA signals from compressor-discharge pressure transmitters, fuel-gas flow meters, and stator-winding temperature transmitters. The group isolation prevents ground loops between distant field devices and the central rack.
On utility-scale EX2000 static exciters, the same card isolates the brushless-exciter field-current transmitter and the rotating rectifier monitor. The C-ESS qualification is particularly valuable here, as exciter failures can cause immediate generator trips with significant revenue impact.
Mechanical-drive gas compressors frequently use this part number to land inlet-pressure and discharge-temperature transmitter loops. Dedicated current-loop optimization provides better noise rejection than general-purpose analog cards in the electrically noisy environment of compressor stations.
