Description
DS3800HPTG1D1E: Product Overview
The DS3800HPTG1D1E is a daughterboard-level pulse-rate input conditioner that plugs onto a motherboard carrier inside the 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 high-speed comparators, counters, opto-isolators, 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 .
DS3800HPTG1D1E
DS3800HPTG1D1E: Technical Specifications
-
Model Number: DS3800HPTG1D1E
-
Manufacturer: General Electric (GE Energy)
-
Product Type: Pulse Rate / Frequency Input Card
-
Channels: 4 differential or 8 single-ended (jumper-selectable)
-
Input Type: Magnetic pickup, shaft encoder, turbine meter (zero-velocity to 100 kHz)
-
Threshold: 50 mV to 120 V p-p (field-adjustable)
-
Isolation: 1500 V AC channel-to-ground, 500 V channel-to-channel
-
Filter: 2-pole Butterworth, 10 Hz–10 kHz jumper-selectable
-
Output Format: 24-bit count, 16-bit frequency, 8-bit status per channel
-
Backplane: 96-pin VME, 5 V and ±15 V supplied by rack
-
Trimmers: Threshold, gain, filter corner (one set per channel)
-
LEDs: Green = pulse present, Red = fault / over-speed
-
Temp Range: -40 °C to +85 °C operational, -55 °C to +125 °C storage
-
Vibration / Shock: 15 g continuous, 30 g shock (IEEE 344)
-
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 Software
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 ground-fault propagation to 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 ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with commercial-grade counters .
DS3800HPTG1D1E
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 .
