Description
DS3800HXPC1D1F: Product Overview
The DS3800HXPC1D1F is the central processor board for GE Speedtronic Mark IV gas- and steam-turbine control racks. Occupying one 6BA09 slot, it hosts the primary control algorithm, I/O scanner, and TMR voter that govern speed control, temperature limiting, fuel sequencing, and protective tripping. The board is hardware-identical across all three legs of the TMR string, ensuring bit-for-bit congruent outputs that are voted every 5 ms.
Physical implementation is 48 integrated circuits (CPUs, latches, parity generators) plus 37 gold-pinned jumpers that select memory maps, scan rates, and I/O enable masks. A dual-edge VME backplane carries address, data, and control buses to companion I/O and memory boards; on-board oscillators provide deterministic timing with <50 ns skew between legs. Front-edge LEDs (red/green) give at-a-glance health: solid green = voter congruent, blinking red = leg faulted, solid red = watchdog timeout.
Environmental qualification meets IEEE 344 Class 1 (seismic) and -40 °C to +85 °C operation, allowing mounting directly on the turbine deck with no extra HVAC. Conformal coat and gold-plated edge fingers inhibit corrosion in offshore or desert sites. MTBF is >300 000 h at 55 °C per IEC 61709, giving >25-year service life in baseload duty.
GE DS3800HXPC1D1F
DS3800HXPC1D1F: Technical Specifications
-
Model Number: DS3800HXPC1D1F
-
Manufacturer: GE Energy (Speedtronic)
-
Product Type: Central Processing Unit (CPU) Board
-
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
-
Backplane: Dual VME, 96-pin, gold-plated
-
Jumpers: 37 position, gold-plated, silk-screen legend
-
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
-
Temp Range: -40 °C to +85 °C operational, -55 °C to +125 °C storage
-
Vibration: 15 g continuous, 30 g shock (IEEE 344)
-
Certifications: SIL2 (IEC 61508), API 670, CE industrial emissions
Core Features & Customer Value
Triple-Modular Redundancy Without Single Point of Failure
Every instruction is executed identically on three HXPC boards; two-out-of-three voter output guarantees continued operation after any single CPU fault. Mean-time-to-repair (MTTR) is <10 min because the faulted leg is auto-disabled and the spare board can be inserted hot—no outage, no load shed.
Every instruction is executed identically on three HXPC boards; two-out-of-three voter output guarantees continued operation after any single CPU fault. Mean-time-to-repair (MTTR) is <10 min because the faulted leg is auto-disabled and the spare board can be inserted hot—no outage, no load shed.
Deterministic 5 ms Scan for Critical Protection
Overspeed, overtemperature, and loss-of-flame algorithms execute within one 5 ms scan, meeting API 670 response limits. Jitter is <50 µs thanks to crystal-based timing; this determinism is mandatory for grid-code compliance in ISO and NERC jurisdictions.
Overspeed, overtemperature, and loss-of-flame algorithms execute within one 5 ms scan, meeting API 670 response limits. Jitter is <50 µs thanks to crystal-based timing; this determinism is mandatory for grid-code compliance in ISO and NERC jurisdictions.
Field-Configurable Without Software Downloads
All mission-critical parameters (scan rate, I/O maps, voter masks) are jumper-selectable—no EEPROM flashing, no laptop on the turbine deck. During forced outages, technicians can re-purpose a spare board in <2 min using only a screwdriver and the silk-screen legend, minimising risk of incorrect configuration.
All mission-critical parameters (scan rate, I/O maps, voter masks) are jumper-selectable—no EEPROM flashing, no laptop on the turbine deck. During forced outages, technicians can re-purpose a spare board in <2 min using only a screwdriver and the silk-screen legend, minimising risk of incorrect configuration.
Seismic & Harsh-Environment Qualified
IEEE 344 Class 1 qualification allows installation on offshore platforms, earthquake zones, and desert sites with >40 °C ambient. Conformal coat and gold-edge connectors eliminate humidity-driven failures, reducing unplanned replacement by >60 % compared with commercial-grade CPUs.
IEEE 344 Class 1 qualification allows installation on offshore platforms, earthquake zones, and desert sites with >40 °C ambient. Conformal coat and gold-edge connectors eliminate humidity-driven failures, reducing unplanned replacement by >60 % compared with commercial-grade CPUs.
GE DS3800HXPC1D1F
Typical Applications
Gas Turbine Generator Control
Primary CPU for Frame 7/9 heavy-duty units: speed PID, temperature limit, acceleration schedule, fuel staging, and grid synchronizing. Triple redundancy ensures 99.97 % start reliability and <0.25 % forced-outage rate on combined-cycle fleets.
Primary CPU for Frame 7/9 heavy-duty units: speed PID, temperature limit, acceleration schedule, fuel staging, and grid synchronizing. Triple redundancy ensures 99.97 % start reliability and <0.25 % forced-outage rate on combined-cycle fleets.
Steam Turbine Mechanical Drive
Controls critical compressors and boiler feed pumps in refineries; 5 ms scan prevents surge or cavitation during rapid load shedding. Hot-swap capability maintains process uptime during CPU replacement without steam header disruption.
Controls critical compressors and boiler feed pumps in refineries; 5 ms scan prevents surge or cavitation during rapid load shedding. Hot-swap capability maintains process uptime during CPU replacement without steam header disruption.
Black-Start & Island Mode
Acts as master timing reference for excitation, synchronizing, and load-sharing when grid is lost. Deterministic voter guarantees seamless island-mode transition <100 ms after breaker open, meeting NERC PRC-024-2 ride-through requirements.
Acts as master timing reference for excitation, synchronizing, and load-sharing when grid is lost. Deterministic voter guarantees seamless island-mode transition <100 ms after breaker open, meeting NERC PRC-024-2 ride-through requirements.
