Description
DS3800HUMA1B1C Product Overview
The DS3800HUMA1B1C is an auxiliary memory / data-processing board that resides in GE Mark IV turbine and EX2000 exciter control racks. It plugs into the 6BA Euro-card file and acts as a distributed processing node: it hosts a local microprocessor, provides high-speed SRAM for data buffering, and isolates the 5 V CPU bus from the 480 V class power electronics. Because all copper traces are fully encapsulated in high-temperature epoxy, the board 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 DS3800HUMA1B1C is an auxiliary memory / data-processing board that resides in GE Mark IV turbine and EX2000 exciter control racks. It plugs into the 6BA Euro-card file and acts as a distributed processing node: it hosts a local microprocessor, provides high-speed SRAM for data buffering, and isolates the 5 V CPU bus from the 480 V class power electronics. Because all copper traces are fully encapsulated in high-temperature epoxy, the board 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.
GE DS3800HUMA1B1C
DS3800HUMA1B1C Technical Specifications
-
Model Number: DS3800HUMA1B1C
-
Manufacturer: General Electric
-
Product Type: Memory / Data-Processing Board (Auxiliary MPU)
-
Series: DS3800, Mark IV Speedtronic
-
Form Factor: 6BA Euro-card (≈ 233 × 160 mm)
-
Back-Plane Connector: Dual 40-pin header (J1/J2)
-
Memory: On-board SRAM for data buffering; non-volatile parameter storage (battery-free)
-
Isolation: 1500 Vdc field-to-logic; opto-coupled digital lines
-
Power Demand: +5 V @ 1.2 A, +3.3 V @ 0.8 A from rack 2PL bus
-
Operating Temperature: 0 – 60 °C
-
Weight: ≈ 0.22 kg
-
Construction: Epoxy-sealed copper traces—non-repairable
Core Features & Customer Value
Distributed Processing & Memory: By hosting a local microprocessor and high-speed SRAM, the card off-loads burst data traffic from the main CPU. This guarantees deterministic response for fast loops (e.g., exciter voltage or fuel-valve position) even when the central processor is busy with sequencing or communications.
Epoxy-Sealed Construction: All internal copper is encapsulated in high-temperature epoxy. In environments with high humidity, dust, or conductive contamination the seal prevents trace-to-trace shorting that would otherwise cause random “MEMORY 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.
Plug-and-Play Euro-Card Footprint: The 6BA form-factor slides straight into the existing Mark IV card file—no mounting brackets or external cabling required. For maintenance crews this translates to a three-minute replacement instead of a half-shift re-cabling job.
GE DS3800HUMA1B1C
Typical Applications
In combined-cycle power plants the board is installed in the Mark IV turbine control core where it provides local memory for the exciter voltage-regulation algorithm. During a black-start the device buffers real-time firing-angle data while the main CPU handles sequencing logic, ensuring the 2 ms control loop remains deterministic.
On utility-scale EX2000 static exciters the same card is used to store diode-fail event logs and bridge-current histograms. Because the memory is battery-free, 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 expand the data-throughput capacity of the inlet-guide-vane control loop. Its ability to mix high-speed data buffering with isolation on one card makes it a universal “memory expander” for any Mark IV loop that needs deterministic, battery-free operation.
