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GE DS3800NSCC1E1D

Product Name: GE Speedtronic Mark IV Speed Current Regulator Card
Product Introduction: The DS3800NSCC1E1D is a speed/current regulator card within the GE Speedtronic Mark IV gas turbine control system. It implements the speed governor, current limiter, and acceleration scheduler functions, closing the control loop around turbine speed, generator load, and fuel flow. The card is hardware-based (no firmware) and deterministic, suitable for safety-related speed control.
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Detailed content

Technical Specifications:
  • Form Factor: 6BA06
  • Interface: Dual VME backplane interface
  • Input Range: 0-120% rated speed, 0-200% rated current (jumper-scaled)
  • Output Range: ±10V or 4-20mA (jumper-selectable)
  • Accuracy: ±0.1% span at 25°C (±0.25% over -40°C to 85°C)
  • Response Time: 50 µs
  • Operating Temperature: -40°C to +85°C
  • Qualification: IEEE 344 seismic qualified (Class 1)
  • MTBF: >250,000 hours at 55°C
Functional Features:
  • Onboard precision comparators, ramp generators, and timing circuits
  • TVS surge suppressors and opto-isolators clamp >500V spikes from exciter flashover or lightning
  • 1500V isolation prevents ground-fault propagation to CPU cards
  • Front-edge red/green LEDs per regulation zone for real-time speed/current status
  • Gold-plated connector fingers for 25-year contact life in high-vibration environments
Working Principle: The card compares magnetic pickup frequency to the speed setpoint, processes the error through hardware comparator and timing circuits, and outputs a ±10V or 4-20mA control signal to the servo or fuel valve. During startup, load ramps, and emergency shutdowns, it regulates turbine speed and current loops in closed-loop fashion.
Application Scenarios:
  • Gas turbine speed and load control (Frame 7/9 heavy-duty units)
  • Steam turbine governor and overspeed protection (driving Moog servo valves)
  • Remote speed/current indication feeding plant DCS
Installation Requirements: Install in the designated 6BA06 slot of the Mark IV control rack. Speed feedback signals must use shielded cable routed away from power cables. Dual 96-pin VME edge connectors mate with CPU and I/O motherboards.
Usage Precautions: Speed control parameter modifications must be performed with the turbine in turning gear or shutdown state. Perform regular full-stroke valve tests to ensure actuator integrity.

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