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GE DS3800NMEC1H1H

Product Name:​ Mark VIe CPU Board / Main Processor and Communication Controller
Product Overview:​ The GE DS3800NMEC1H1H is the primary CPU controller board for the Mark VIe Speedtronic series, used extensively in heavy-duty gas and steam turbine control applications. This VMEbus form-factor processor handles real-time execution of turbine sequencing, fuel control, and protection logic in power generation and industrial drive environments.
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Technical Specifications:
  • Model: DS3800NMEC1H1H
  • Brand: GE (General Electric)
  • Series: Mark VIe Speedtronic
  • Core Function: Main processor and communication controller for GE Mark VIe turbine management systems
  • Product Type: VME-based CPU / Main Controller Board
  • Processor: PowerPC 300 MHz
  • Memory (SDRAM): 64 MB
  • Flash Storage: 32 MB (firmware + configuration)
  • Ethernet Ports: 2 x 10/100Base-T (RJ45)
  • Serial Communication: 1 x RS-232 (debug/console)
  • Backplane Interface: VMEbus (P1/P2 connectors)
  • I/O Scan Rate: 1 ms typical (configurable)
  • Operating Temperature: 0 to +60°C (ambient)
  • Storage Temperature: −40 to +85°C
  • Power Consumption: 12 W (5 VDC, 2.4 A typical)
  • Firmware Compatibility: Mark VIe Toolbox version 5.0 or later
  • Dimensions: 6U VME form factor (233 x 160 mm)
  • RoHS Status: Compliant (lead-free solder)
  • Condition: New Surplus / OEM pull
  • Status: Discontinued by GE; extremely rare—likely the final production revision
Functional Features:
  • Dedicated dual Ethernet architecture separates control network traffic from the human-machine interface (HMI) data path
  • Dual isolated Ethernet channels cut HMI polling interference, maintaining sub-2 ms control loop response
  • Handles real-time execution of turbine sequencing, fuel control, and protection logic
  • Wide firmware compatibility: Supports Mark VIe Toolbox 5.0 through 7.3
  • 100% live-tested: Every unit undergoes a 48-hour burn-in with a full I/O simulation before QC sign-off
Working Principle:​ As the primary CPU controller, this VMEbus form-factor processor executes turbine control logic in real-time. Its dedicated dual Ethernet architecture reduces network collisions and maintains deterministic scan times under heavy I/O loads.
Application Scenarios:​ Heavy-duty gas and steam turbine control applications in power generation and industrial drive environments.
Key Differentiators:
  • Reduced network latency through dual isolated Ethernet channels
  • Direct drop-in solution for existing Mark VIe installations, preserving configuration and I/O rack wiring
  • Anti-counterfeit protection with visual and x-ray inspection, plus component-level traceability to OEM lots
Installation & Usage Notes:
  • Absolutely not hot-swappable.​ The VME backplane does not support hot-swap of the main CPU
  • Must perform a complete system shutdown, remove power from the rack
  • Wait for internal capacitors to discharge (about 2 minutes) before removal

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