Description
DS3800NSCC1E1D: Product Overview
The DS3800NSCC1E1D is a central regulation card within the GE Speedtronic Mark IV gas-turbine control rack. It implements the speed governor, current limiter, and acceleration scheduler functions that close the loop around turbine speed, generator load, and fuel flow. The card is hardware-based (no firmware) and deterministic, making it suitable for safety-related speed control when triple-redundant.
Physical implementation includes precision comparators, ramp generators, timing circuits, and TVS surge suppressors. Dual 96-pin VME edge connectors mate with the CPU and I/O motherboards; gold-plated fingers ensure 25-year contact life in high-vibration environments. Front-edge LEDs (red/green) per regulation zone give real-time speed/current status—no laptop 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 DS3800NSCC1E1D
DS3800NSCC1E1D: Technical Specifications
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Model Number: DS3800NSCC1E1D
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Manufacturer: General Electric (GE Energy)
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Product Type: Speed Current Regulator Card
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System Compatibility: Speedtronic Mark IV (6BA06 slot)
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Function: Speed governor, current limiter, acceleration scheduler
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Input Range: 0–120 % rated speed, 0–200 % rated current (jumper-scaled)
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Output Range: ±10 V or 4–20 mA (jumper-selectable)
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Accuracy: ±0.1 % span @ 25 °C (±0.25 % over -40–85 °C)
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Response Time: <5 ms small-signal, <15 ms large-signal step
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Isolation: 1500 V AC board-to-ground, 500 V channel-to-channel
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Backplane: Dual 96-pin VME, gold-plated edge fingers
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Power Rails: +5 V DC logic, ±15 V DC analog, <1 W total
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LEDs: Green = regulator active, Red = limit / fault
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Temp Range: -40 °C to +85 °C operational, -55 °C to +125 °C storage
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Vibration / Shock: 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
Hardware-Based Speed/Current Loops for Safety
Analog comparators and ramp generators close the speed and current loops without firmware, ensuring deterministic response during overspeed or overcurrent events. <5 ms small-signal response meets API 670 governor requirements, preventing turbine overshoot or generator over-load.
Analog comparators and ramp generators close the speed and current loops without firmware, ensuring deterministic response during overspeed or overcurrent events. <5 ms small-signal response meets API 670 governor requirements, preventing turbine overshoot or generator over-load.
Hot-Swappable in TMR Strings
Redundant Mark IV allows online replacement of one regulator 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 regulator card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Field-Calibrated Without Software
Trimmer pots adjust speed set-point, current limit, and acceleration ramp—technician can tune for different turbine inertia or generator rating using only a screwdriver and a DMM, reducing commissioning time by >50 %.
Trimmer pots adjust speed set-point, current limit, and acceleration ramp—technician can tune for different turbine inertia or generator rating using only a screwdriver and a DMM, reducing commissioning time by >50 %.
Surge-Hardened for Turbine Deck
TVS diodes and opto-isolators clamp >500 V spikes from exciter flash-over or lightning. 1500 V isolation prevents ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with non-isolated regulators.
TVS diodes and opto-isolators clamp >500 V spikes from exciter flash-over or lightning. 1500 V isolation prevents ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with non-isolated regulators.
GE DS3800NSCC1E1D
Typical Applications
Gas Turbine Speed & Load Control
Primary speed governor for Frame 7/9 heavy-duty units: compares magnetic pickup frequency to set-point, outputs ±10 V to Woodward servo, maintaining speed within ±0.02 % from no-load to full-load.
Primary speed governor for Frame 7/9 heavy-duty units: compares magnetic pickup frequency to set-point, outputs ±10 V to Woodward servo, maintaining speed within ±0.02 % from no-load to full-load.
Steam Turbine Governor & Over-speed Protection
Speed/current loops drive Moog servo valves on governor and over-speed protection valves. Deterministic response prevents valve dither and mechanical wear, extending servo life to >100 k hours.
Speed/current loops drive Moog servo valves on governor and over-speed protection valves. Deterministic response prevents valve dither and mechanical wear, extending servo life to >100 k hours.
Remote Indication & DCS Interface
4–20 mA scaled outputs feed plant DCS for remote speed meters, current indicators, and load displays. Isolation eliminates ground-loop noise that would corrupt analog loops in large combined-cycle sites.
4–20 mA scaled outputs feed plant DCS for remote speed meters, current indicators, and load displays. Isolation eliminates ground-loop noise that would corrupt analog loops in large combined-cycle sites.
