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GE DS3800HXPC

Product Name: GE DS3800HXPC — Mark IV / Mark V Series Module
Product Introduction: Published sources identify the DS3800HXPC base model differently depending on the full suffix. The DS3800HXPC1D1F variant is documented as the central processing unit (CPU) board for GE Speedtronic Mark IV gas- and steam-turbine control racks. The base DS3800HXPC designation is also documented as a Mark V high-speed pulse counter board with extended temperature range. The exact configuration must be verified against the complete part number suffix on the board label.
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Technical Specifications (DS3800HXPC1D1F — Mark IV CPU Board):
  • Model: DS3800HXPC1D1F
  • Product type: Central Processing Unit (CPU) Board
  • Architecture: Triple-Modular-Redundant (TMR)
  • Processor: 16-bit control-oriented CPU with parity-checked buses
  • Memory interface: 64 kB direct map (expandable to 256 kB via daughterboard)
  • Scan rate: 5 ms (configurable 2–10 ms via jumper)
  • I/O capacity: 4096 DI/DO or 1024 AI/AO points (voted)
  • TMR voting: bit-wise majority voter, fail-fast on mis-compare
  • Integrated circuits: 48 ICs (CPUs, latches, parity generators)
  • Configuration jumpers: 37 gold-pinned
  • Backplane: dual VME, 96-pin, gold-plated
  • Power: +5 V DC @ 3 A, +12 V DC @ 0.5 A (from rack PSU)
  • Isolation: 500 V DC board-to-ground, 1500 V channel-to-channel
  • Operating temperature: -40 °C to +85 °C
  • Storage temperature: -55 °C to +125 °C
  • Vibration: 15 g continuous, 30 g shock (IEEE 344)
  • Certifications: SIL2 (IEC 61508), API 670, CE industrial emissions
  • Service life: > 25 years in baseload duty (300,000 h at 55 °C per IEC 61709)
  • Slot: one 6BA09 slot
Technical Specifications (DS3800HXPC — Mark V High-Speed Pulse Counter):
  • Series: Mark V Speedtronic
  • Type: I/O Module (High-Speed Pulse Counter)
  • Pulse channels: 8, differential or single-ended
  • Input frequency: 0–10 kHz (field-configurable)
  • Input logic level: 24 V DC (sinking/sourcing)
  • Counter resolution: 32-bit
  • Frequency measurement: 0.01 Hz resolution
  • Period measurement: 1 µs resolution
  • Phase measurement: 1 µs resolution between any two channels
  • Operating temperature: -40 °C to +85 °C
  • Isolation: 2500 V AC optical / channel-to-backplane
  • Power draw: +5 V DC @ 2.0 A; +15 V DC @ 0.5 A
  • Dimensions: 6U VME (233.35 × 160 mm)
Functional Features:
  • CPU Board: executes turbine protection, sequencing, and I/O scanning in TMR architecture; provides system synchronization, voltage matching, and fault-tolerant control
  • CPU Board: every instruction executed identically on three HXPC boards; 2-out-of-3 voter output guarantees continued operation after any single CPU fault
  • Pulse Counter: frequency, period, and phase measurement; 32-bit accumulation; extended temperature range for advanced pulse analysis
Material Composition:
  • 48 integrated circuits (CPUs, latches, parity generators)
  • 37 gold-pinned configuration jumpers
  • Dual VME backplane, 96-pin, gold-plated
  • Conformal coat and gold-edge connectors
Structural Features:
  • One 6BA09 slot (CPU board) or 6U VME (233.35 × 160 mm) form factor
  • Hardware-identical across all three legs of the TMR string (CPU board)
Application Scenarios:
  • CPU Board: gas turbine generator control (Frame 7/9 heavy-duty units), steam turbine mechanical drive control, black-start and island mode operation
  • Pulse Counter: encoder signal measurement, flow meter comparison, timing analysis, advanced pulse analysis in extended temperature environments
Working Principle:
  • CPU Board: occupies one 6BA09 slot in the Mark IV rack, hosts primary control algorithm, I/O scanner, and TMR voter governing speed control, temperature limiting, fuel sequencing, and protective tripping. Every instruction is executed identically on three boards, with 2-out-of-3 voting every 5 ms.
  • Pulse Counter: measures frequency, period, and phase relationships of input pulse trains using 32-bit accumulators with extended temperature tolerance for harsh environments.
Installation Requirements:
  • Verify exact base model and full suffix — the DS3800HXPC is a specialized/custom variant
  • For CPU board: install in designated Mark IV rack slot; triple redundancy requires three identical boards
  • For Mark V pulse counter: configure W1–W8 jumpers to match specific speed sensor type (VR or proximity) before installation
  • Use shielded twisted-pair cabling with single-point ground at turbine terminal box
  • ESD protection mandatory — CMOS components are sensitive; use wrist straps and grounded workstations

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