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GE DS200FCGDH1B
- Product Name: GE Mark V/VI LCI Gate Distribution & Status Card
- Overview: A VME-based power electronics interface board used in GE Speedtronic Mark V and Mark VI turbine control systems. It acts as the critical interface between the digital control world and analog power electronics, distributing SCR gate firing signals and monitoring Load Commutated Inverter (LCI) status feedback.
Detailed content
- Technical Specifications:
- Channels: 12 gate channels
- Input Span: −8 mV to +45 mV
- Logic Supply: 5 V DC (board electronics), 24 V DC (isolated I/O)
- Operating Temperature: −30 °C to +65 °C
- Form Factor: 9.2 × 6.3 in (233 × 160 mm), single-slot VME
- Weight: 0.45 kg
- Connectors: VME P1/P2 backplane, 20-pin ribbon (NATO feedback), six fiber-optic transmitters
- Bridge Type: 6-pulse phase-controlled, non-reversing SCR bridge
- Functional Features: Receives multiplexed cell-status signals from each bridge leg and decodes them into individual SCR gate pulses; generates and distributes high-current gate pulses via fiber-optic links to six SCR cells; scales bridge feedback (voltage, current, frequency) and routes digitized values to the DSPC over the VME backplane; integrates a 16-bit system clock register for precise firing timing; on-board sigma-delta converters and VCOs condition analog feedback; hardware reset circuit initializes all registers at power-up or after watchdog timeout.
- Working Principle: Receives SCR firing commands from the DSPC processor via VME, converts them to fiber-optic gate pulses for the thyristors, then multiplexes status feedback back to the processor.
- Applications: Large AC motor drives and LCIs in power plants, steel mills, petrochemical facilities; synchronous motor starting systems; pumped-storage hydro units; gas-turbine static starting systems; generator excitation control.
- Installation Requirements: Mounts on standard Mark V/VI card cage, secured by top/bottom extraction levers; fiber-optic cables must maintain < 2 dB loss with bend radius ≥ 30 mm; NATO feedback board jumpers must be set to match DC-link voltage level.
- Usage Notes: Not hot-swappable—kill power to the Mark V rack before installing or removing; verify firmware compatibility with the host VME processor; LED diagnostics include IMOK (heartbeat), GATE 1–6 (firing), and FLT (fault).
