Description
DS3800NDID1P1H Product Overview
The DS3800NDID1P1H is the principal micro-processor motherboard inside GE Mark IV turbine and EX2000 exciter control racks. Occupying a 6BA Euro-card slot, it carries the Freescale host CPU, battery-backed SRAM for set-points, and the parallel/serial buses that link the NDIA data highway to the high-voltage bridge cards. In normal operation the device executes the turbine start-up sequence, closed-loop speed control, and VAR regulation algorithms while continuously mirroring critical data to 128 kB of on-board non-volatile storage—eliminating the need for a lithium cell. Because all copper layers 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. Installation is plug-and-play: rack the old card, move the two 40-pin back-plane connectors, and the Mark IV acknowledges “CPU OK” on the next power-up—no software download or re-calibration required.
The DS3800NDID1P1H is the principal micro-processor motherboard inside GE Mark IV turbine and EX2000 exciter control racks. Occupying a 6BA Euro-card slot, it carries the Freescale host CPU, battery-backed SRAM for set-points, and the parallel/serial buses that link the NDIA data highway to the high-voltage bridge cards. In normal operation the device executes the turbine start-up sequence, closed-loop speed control, and VAR regulation algorithms while continuously mirroring critical data to 128 kB of on-board non-volatile storage—eliminating the need for a lithium cell. Because all copper layers 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. Installation is plug-and-play: rack the old card, move the two 40-pin back-plane connectors, and the Mark IV acknowledges “CPU OK” on the next power-up—no software download or re-calibration required.
GE DS3800NDID1P1H
DS3800NDID1P1H Technical Specifications
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Model Number: DS3800NDID1P1H
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Manufacturer: General Electric (GE Fanuc)
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Product Type: Drive Interface / Microprocessor Motherboard
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Series: DS3800, Mark IV Speedtronic
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Form Factor: 10 × 12 × 1.5 in. epoxy-sealed PCB
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Weight: 1.5 lb (≈ 0.68 kg)
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Memory: 64 MB integrated RAM; 128 kB non-volatile (battery-free)
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Operating Temperature: -40 °C to +85 °C
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Storage Temperature: -40 °C to +80 °C
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Back-Plane Interface: Dual 40-pin header (J1/J2) to NDIA bus
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Power Demand: +5 V @ 3 A, +3.3 V @ 1 A, +12 V @ 0.5 A from rack 2PL bus
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Isolation: 1500 Vdc field-to-logic; 2.5 kV optical on optional gate fibers
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Construction: Epoxy-sealed copper traces—non-repairable
Core Features & Customer Value
Integrated Processor & Memory: The on-board 64 MB SDRAM hosts the turbine control firmware, while 128 kB of non-volatile FRAM retains set-points and event logs without a lithium cell. For the maintenance engineer this eliminates the annual battery-change task and the risk of losing calibration data during an outage.
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 “CPU 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 the reduced troubleshooting time and the fact that plants stock one spare instead of maintaining a repair bench.
Wide Temperature Range: The -40 °C to +85 °C rating allows the same part number to be used in outdoor compressor stations or desert peaker plants without additional heating or cooling. This simplifies spares inventory and reduces the chance of ordering the wrong variant during a forced outage.
GE DS3800NDID1P1H
Typical Applications
In combined-cycle power plants the board is installed in the Mark IV turbine control core where it hosts the main control program for gas-turbine start-up, speed/load control, and generator VAR regulation. During a black-start the device executes the acceleration ramp, monitors exhaust temperatures, and modulates the IGV position to prevent surge.
On utility-scale EX2000 static exciters the same card hosts the field-current regulation algorithm, firing the six-pulse SCR bridge while logging diode-fail events in the 128 kB FRAM. Because the memory is non-volatile, fault history is preserved even if the station battery is disconnected during maintenance.
Frequently the same part number is used on mechanical-drive gas compressors to host the anti-surge control program. Its ability to mix digital sequencing and floating-point math on one card makes it a universal “main CPU” for any Mark IV loop that needs deterministic, battery-free operation.
