Description
DS3800NTBB1A1A Product Overview
The DS3800NTBB1A1A is a terminal board base that plugs into GE Mark IV turbine and EX2000 exciter control racks. Occupying a 6BA Euro-card slot, it acts as the physical interface between field wiring and the control electronics: it provides screw-clamp landing points for analog and digital signals, integrates 40 mm MOVs for surge protection, and distributes conditioned signals to the daughter cards mounted above it. Unlike active processor boards, the NTBB contains no microprocessor or logic—its function is purely passive signal routing and protection. 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 low-profile epoxy package allows adjacent-slot population without additional cooling.
The DS3800NTBB1A1A is a terminal board base that plugs into GE Mark IV turbine and EX2000 exciter control racks. Occupying a 6BA Euro-card slot, it acts as the physical interface between field wiring and the control electronics: it provides screw-clamp landing points for analog and digital signals, integrates 40 mm MOVs for surge protection, and distributes conditioned signals to the daughter cards mounted above it. Unlike active processor boards, the NTBB contains no microprocessor or logic—its function is purely passive signal routing and protection. 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 low-profile epoxy package allows adjacent-slot population without additional cooling.
DS3800NTBB1A1A Technical Specifications
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Model Number: DS3800NTBB1A1A
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Manufacturer: General Electric (GE Fanuc)
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Product Type: Terminal Board Base / Field Wiring Interface
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Series: DS3800, Mark IV Speedtronic
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Form Factor: 6BA Euro-card (≈ 233 × 160 mm)
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Field Connections: Screw-clamp terminals (typically 12–20 positions, density-dependent)
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Daughter-Card Mate: DS3800NCIA, NVIA, NSWA, or similar active I/O cards
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Surge Protection: 40 mm MOVs, integral with board traces
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Isolation: 1500 Vdc field-to-logic (via daughter-card opto-isolators)
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Current Rating: 5 A per terminal (typical)
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Wire Range: 14–26 AWG (screw-clamp)
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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
DS3800NCVA1A1B
Core Features & Customer Value
Integrated Surge Protection: The on-board 40 mm MOVs clamp lightning and switching transients at the field entry point, preventing damage to downstream active electronics. For the maintenance engineer this eliminates external surge arresters and reduces wiring complexity, cutting installation time 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 terminal-to-terminal shorting that would otherwise cause random “FIELD WIRING 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.
Modular Daughter-Card Interface: The NTBB is designed to mate with multiple active daughter cards (NCIA for current loops, NVIA for voltage, NSWA for switches). For the system integrator this means a common terminal base can be stocked, with only the active electronics changing per application—simplifying spares logistics and reducing inventory cost.
DS3800NCVA1A1B
Typical Applications
In combined-cycle power plants the board is installed in the Mark IV turbine control core where it lands field wiring from exhaust-temperature thermocouple transmitters, compressor-discharge pressure switches, and cooling-fan contactors. The MOVs absorb lightning-induced transients before they reach the active NCIA/NVIA cards above.
On utility-scale EX2000 static exciters the same base is used to terminate the brushless-exciter field-current cables and the diode-fail monitoring wiring. Because the surge protection is integral, a lightning strike on the field bus is clamped at the terminal board rather than propagating to the CPU rack.
Frequently the same part number is used on mechanical-drive gas compressors to land inlet-pressure transmitter wiring and guide-vane limit-switch cables. Its ability to mate with multiple daughter-card types makes it a universal “wiring hub” for any Mark IV loop that needs organized, protected field termination.
