GE DS200GGDAG1A
GE DS200GGDAG1A - Image 2

GE DS200GGDAG1A

Product Introduction: The DS200GGDAG1A is a key excitation control board in the GE Speedtronic Mark V turbine control system, responsible for converting digital control commands from the main controller into analog drive signals for SCR (thyristor) power units in generator AVR (Automatic Voltage Regulation) systems.

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Description

GE DS200GGDAG1A

  • Technical Specifications:
    • System: Speedtronic Mark V
    • Analog Outputs: 2 independent ±10 V DC channels
    • Isolation: Optical isolation + transformer isolation
    • Mounting: Mark V I/O rack (VME-based)
    • Operating Temp: 0°C to +60°C
  • Functional Features: High-precision D/A conversion; feedback acquisition from SCR bridge; output limiting and protection logic; onboard LED indicators (Power, OK, Fault); VME backplane communication with TCEA/TCCA controller cards.
  • Application Scenarios: Generator excitation control in gas/steam turbine power plants, synchronous generator AVR loops, industrial cogeneration units, hydro-turbine voltage regulation systems.
  • Performance Parameters: Output stability maintained under 60°C ambient; common-mode noise rejection via dual isolation; supports dual-channel redundant excitation or dual-range control; compatible with Mark V triple modular redundant architecture.
  • Material Composition: Multilayer controlled-impedance PCB; precision D/A converters and op-amps; optically coupled isolators; gold-plated VME connector fingers; conformal coating for humidity resistance.
  • Structural Features: 6U VME card with front faceplate containing status LEDs; edge connector for backplane power/data; surface-mounted components; silkscreened test points for calibration verification.
  • Working Principle: Receives digital excitation demand values from the Mark V main processor via VMEbus, converts them to ±10 V analog signals via precision D/A converters, isolates these signals galvanically, and drives the SCR firing circuitry to regulate generator field current, thereby stabilizing terminal voltage.
  • Installation Requirements: Insert into assigned Mark V I/O slot ensuring full engagement with J1/J2 backplane; verify that associated terminal boards (e.g., for feedback) are cabled correctly; ensure 28 V DC backplane power is within tolerance before rack energization.
  • Usage Precautions: Static discharge can destroy D/A converters—use grounded wrist strap; if replacing a failed board, compare jumper/dip-switch settings with the removed unit; monitor OK/Fault LEDs during commissioning—Fault lit indicates backplane communication loss or output overload.

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