Description
DS3800HPRB1B1B: Product Overview
The DS3800HPRB1B1B is a pulse-rate input daughterboard that occupies a 6BA09 slot in the GE Speedtronic Mark IV rack. It receives high-frequency pulse trains from magnetic speed pickups, shaft encoders, and turbine-flow transmitters, conditions the signals, and streams frequency / count data to the central CPU over the VME back-plane. The card is essential for speed control, acceleration limiting, flow summation, and grid-frequency tracking in gas and steam turbines.
Physical implementation includes 46 discrete ICs (comparators, counters, opto-isolators), multi-pole low-pass filters, and TVS surge suppressors. Three front-edge trimmers (threshold, gain, filter) allow field calibration of pickup sensitivity and noise rejection. LEDs (red/green) per channel give real-time pulse-train health—no scope required during commissioning.
Environmental qualification meets IEEE 344 Class 1 (seismic) and –40 °C to +85 °C operation, permitting installation directly on the turbine deck with no extra HVAC. MTBF is >250 000 h at 55 °C, giving >20-year service life in baseload duty.
GE DS3800HPRB1B1B
DS3800HPRB1D1E: Technical Specifications
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Model Number: DS3800HPRB1B1B
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Manufacturer: GE Energy (Speedtronic)
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Product Type: Pulse Rate Input Card
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Channels: 4 differential or 8 single-ended (jumper-selectable)
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Input Type: Magnetic pickup, shaft encoder, turbine meter (zero-velocity to 100 kHz)
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Threshold: 50 mV to 120 V p-p (field-adjustable)
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Isolation: 1500 V AC channel-to-ground, 500 V channel-to-channel
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Filter: 2-pole Butterworth, 10 Hz–10 kHz jumper-selectable
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Output Format: 24-bit count, 16-bit frequency, 8-bit status per channel
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Backplane: 96-pin VME, 5 V and ±15 V supplied by rack
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Trimmers: Threshold, gain, filter corner (one set per channel)
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LEDs: Green = pulse present, Red = fault / over-speed
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Temp Range: -40 °C to +85 °C operational, -55 °C to +125 °C storage
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Vibration: 15 g continuous, 30 g shock (IEEE 344)
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Certifications: SIL2 (IEC 61508), API 670, CE industrial emissions
Core Features & Customer Value
Microsecond-Accurate Speed Measurement
Zero-velocity to 100 kHz range covers cold-crank (1 rpm) through overspeed (120 % rated). <1 µs edge-to-edge jitter ensures speed-loop bandwidth >10 Hz, mandatory for grid-code frequency-response compliance .
Zero-velocity to 100 kHz range covers cold-crank (1 rpm) through overspeed (120 % rated). <1 µs edge-to-edge jitter ensures speed-loop bandwidth >10 Hz, mandatory for grid-code frequency-response compliance .
Hot-Swappable in TMR Strings
Redundant Mark IV allows online replacement of one pulse-rate card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Redundant Mark IV allows online replacement of one pulse-rate card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Field-Adjustable Without Laptops
Threshold potentiometer compensates for pickup gap erosion or cable attenuation; filter knob rejects gear-mesh noise at 4200 Hz. Technician can optimize signal-to-noise using only a wrench and a multimeter—no OEM software needed.
Threshold potentiometer compensates for pickup gap erosion or cable attenuation; filter knob rejects gear-mesh noise at 4200 Hz. Technician can optimize signal-to-noise using only a wrench and a multimeter—no OEM software needed.
Surge-Hardened for Turbine Deck
TVS diodes and opto-isolators clamp >500 V spikes from lightning, VFD switching, or exciter flash-over. 1500 V isolation prevents cascade failure of downstream CPU cards, reducing unplanned replacement by >60 % compared with commercial-grade counters.
TVS diodes and opto-isolators clamp >500 V spikes from lightning, VFD switching, or exciter flash-over. 1500 V isolation prevents cascade failure of downstream CPU cards, reducing unplanned replacement by >60 % compared with commercial-grade counters.
GE DS3800HPRB1B1B
Typical Applications
Gas Turbine Speed & Acceleration Control
Primary speed sensor input for Frame 7/9 heavy-duty units: magnetic pickup on auxiliary gear delivers 4–20 kHz during start-up; card outputs 24-bit speed and 16-bit acceleration to the CPU every 5 ms, enabling acceleration-limiting and overspeed-protection <110 %.
Primary speed sensor input for Frame 7/9 heavy-duty units: magnetic pickup on auxiliary gear delivers 4–20 kHz during start-up; card outputs 24-bit speed and 16-bit acceleration to the CPU every 5 ms, enabling acceleration-limiting and overspeed-protection <110 %.
Steam Turbine Flow & Power Measurement
Turbine-meter pulse trains (0.1–5 kHz) are scaled to steam-flow and megawatt totals. Filter set to 100 Hz removes piping vibration while preserving flow transients during load rejection.
Turbine-meter pulse trains (0.1–5 kHz) are scaled to steam-flow and megawatt totals. Filter set to 100 Hz removes piping vibration while preserving flow transients during load rejection.
Black-Start & Grid Islanding
Encoder on the emergency diesel provides 0.01 Hz resolution for synchronizing to islanded bus. Deterministic edge-detection guarantees phase-angle matching <0.5°, mandatory for NERC PRC-024-2 ride-through.
Encoder on the emergency diesel provides 0.01 Hz resolution for synchronizing to islanded bus. Deterministic edge-detection guarantees phase-angle matching <0.5°, mandatory for NERC PRC-024-2 ride-through.
