Digital guide

You are here:
  1. Home
  2. GE
  3. GE DS3800HUMA1B1C

GE DS3800HUMA1B1C

Product Name:​ GE DS3800 HUMA Universal Memory / Data-Processing Board (Mark IV Speedtronic)
Product Introduction:​ The GE DS3800HUMA1B1C is a memory / data-processing board (auxiliary microprocessor unit) for GE’s Mark IV Speedtronic turbine control system and EX2000 exciter control racks. It hosts a local microprocessor and battery-free memory, bridging high-speed data between the CPU and remote I/O cards while isolating 5 V logic from 480 V field circuits.
WhatApp
WeChat

Detailed content

Technical Specifications:
  • Manufacturer: General Electric
  • Model: DS3800HUMA1B1C
  • Series: DS3800, Mark IV Speedtronic
  • Product type: Memory / data-processing board (auxiliary MPU)
  • 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 V DC 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 °C to 60 °C
  • Weight: ≈ 0.22 kg
  • Construction: Epoxy-sealed copper traces — non-repairable (line-replaceable module)
  • Alternative identification: Universal memory board with EPROM modules (user-installed), diagnostic LED, reset switch, jumper configuration for quad logic zones
Functional Features:
  • Distributed processing: Local microprocessor and high-speed SRAM off-load burst data traffic from the main CPU, guaranteeing deterministic response for fast control loops (e.g., exciter voltage or fuel-valve position)
  • Epoxy-sealed construction: All internal copper is encapsulated in high-temperature epoxy, preventing trace-to-trace shorting in humid, dusty, or contaminated environments; trades repairability for reliability — any internal fault requires whole-card exchange
  • Plug-and-play Euro-card footprint: 6BA form factor slides directly into the existing Mark IV card file with no mounting brackets or external cabling — a three-minute replacement
  • Battery-free non-volatile memory: Eliminates battery replacement and “MEMORY FAIL” alarms caused by depleted batteries
  • 5 V CPU bus isolation from 480 V class power electronics
Working Principle:​ The board plugs into the Mark IV 6BA Euro-card file and acts as a distributed processing node. Its local microprocessor, supported by high-speed SRAM, buffers data and executes fast control loops, communicating with the main CPU via the dual 40-pin back-plane connectors. Opto-couplers and 1500 V DC isolation barriers protect the 5 V logic from 480 V field circuits. All copper traces are fully encapsulated in high-temperature epoxy, making the board a line-replaceable module.
Application Scenarios:​ GE Mark IV turbine control racks and EX2000 exciter control racks — providing program/data storage, distributed processing, and memory functions for turbine control sequences.
Installation Requirements:
  • Insert into the 6BA Euro-card slot in the Mark IV card file
  • Ensure rack 2PL bus provides +5 V @ 1.2 A and +3.3 V @ 0.8 A
  • Fully hot-swappable when the rack is powered down
  • Low-profile epoxy package allows adjacent-slot population without additional cooling
Usage Precautions:
  • Non-repairable construction — any internal fault requires a complete card swap rather than component-level rework
  • Operating temperature must be maintained within 0 °C to 60 °C
  • The DS3800 series is a legacy platform; modern PLC or DCS systems have largely replaced it in new installations, but the board remains essential as a spare for sustaining existing Mark IV turbine control racks
  • Stock spare cards to avoid extended downtime, as component-level repair is not possible

You may also like