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GE DS200TCCBG3B
- Product Name: GE Mark V Analog I/O Board / TCCB Extended Analog I/O Drive Board
- Overview: A core analog processing and common control module within the GE Mark V Speedtronic turbine control system. It manages the critical interface between field instrumentation and control processors, specializing in scaling and conditioning of analog inputs and outputs, while also serving as a centralized coordination hub for the R, S, and T control cores.
Detailed content
- Technical Specifications:
- System Series: Mark V Speedtronic / TC2000
- Input Channels: LVDT, Thermocouple, 4–20 mA, ±10 V differential
- Output Channels: 0–20 mA / 4–20 mA servo driver outputs
- Processing: High-speed 12-bit/16-bit digitization
- Interface: Multiple high-density ribbon cable connectors (J-ports); VME bus
- Isolation: Integrated galvanic and optical isolation
- Operating Temperature: 0 to 55 °C (some sources state up to 60 °C)
- Power Supply: 28 V DC nominal
- Weight: 620 g (approx. 0.45 kg)
- Dimensions: 215 × 154 × 30 mm
- Redundancy: Full Triple Modular Redundancy (TMR) support
- Engineering Advantages:
- Synchronous LVDT Demodulation: Dedicated hardware for LVDT excitation and demodulation eliminates phase-shift errors from long field cables, ensuring ultra-accurate valve stroke position.
- Dynamic Signal Filtering: Active multi-stage filters strip high-frequency EMI and 50/60 Hz line noise, keeping millivolt-level thermocouple signals stable in electrically noisy power plant environments.
- Precision Servo Loop Control: Manages high-speed current loops required to drive electro-hydraulic servo valves, maintaining constant, drift-free output to prevent valve hunting and reduce mechanical wear.
- Centralized Core Coordination: Synchronizes data across redundant R, S, and T cores, preventing timing skew and ensuring all control loops act on the same data set.
- Comprehensive Self-Health Monitoring: Continuously executes internal diagnostics, monitoring reference voltages and A/D linearity, triggering alarms on the HMI if hardware drift is detected.
- TMR Fault Isolation: Performs cross-core voting and signal comparison, detecting and voting out a single core failure while maintaining uninterrupted control.
- Working Principle: Digitizes feedback from LVDTs, thermocouples, and pressure transducers; provides precise current and voltage regulation for servo valve drivers; ensures exact fuel flow and steam valve positions during all phases of turbine operation.
- Applications: Gas and steam turbine control; TC2000 drive systems; field instrumentation interfacing in power generation; servo-hydraulic valve control; complex turbine auxiliary system management.
- Installation Requirements: Mounts in Mark V turbine control rack; “G3B” revision features upgraded component set for better thermal stability—verify site-specific software configuration supports G3 hardware; VME backplane connectors must be properly seated.
- Usage Notes: Factory-calibrated precision resistors are included, but a “Field Loop Calibration” must be performed via Mark V software after installation to synchronize the board with the specific range and offset of field sensors; the G3B revision remains backward compatible with most Mark V systems but firmware and VME bus configuration must be verified against original site documentation.
