GE DS200DCFBG1B/DS200DCFBG1BNC DC Feedback Board
1、 Model Basic Definition
Series ownership
DS200=GE Mark V Speedtronic Gas Turbine/Excitation System Board Platform;
DCFB=DC Feedback Board DC Feedback Power Board;
G1=first generation hardware PCB version;
DS200DCFBG1B: Standard version, output feedback signal from cable terminal
DS200DCFBG1BNC: Same PCB hardware, onboard BNC coaxial interface, used for high-frequency armature/excitation current and voltage feedback signal transmission, suitable for high-precision excitation acquisition scenarios. The two functions are completely interchangeable and can be directly exchanged
supporting system
Turbine control: Mark V gas/steam turbine
Excitation drive: EX2000, AC2000, DC2000, CB2000, ME2000 static excitation system
Supporting main control: DS200SDCCG1A (SDCC drive control card) cooperates to form a complete excitation control unit
2、 Two core functions (integrated power supply and feedback acquisition)
1. Multi channel stabilized power supply unit of the system
Receive control cabinet control power transformer (CPT) with two AC inputs: 38VAC, 115VAC, complete AC-DC conversion, and output multiple controlled power sources to the entire excitation drive system:
24VDC control power supply: supplying SDCC main control card, I/O conditioning board, signal acquisition circuit
± 15VDC analog reference power supply: supplies power to feedback sampling and operational amplifier circuits
Independent 115VAC output: dedicated power supply circuit for cabinet cooling fans
Integrated fuses, EMI filters, and surge absorption circuits inside the board to suppress strong electromagnetic interference in power plants
2. DC feedback signal acquisition and processing (core “feedback” function)
Onboard high-precision differential sampling circuit, real-time acquisition of excitation/DC drive key operating quantities, converted into standard weak current signals and uploaded to SDCC main control board for closed-loop regulation:
Sampling of armature DC current and rotor excitation current
Feedback of terminal voltage and excitation bridge output voltage
Voltage monitoring of SCR thyristor rectification trigger circuit
Built in hardware current limiting and overvoltage isolation, filtering out harmonic interference from high-power rectifier circuits
BNC version coaxial interface transmits high-frequency feedback signals with lower signal attenuation, suitable for high-precision excitation regulation of high-power units
3、 Key electrical technical parameters
Parameter specifications
The dual input of 38VAC and 115VAC is taken from the CPT transformer for communication
DC output 24VDC, ± 15VDC control power supply; 115VAC fan power supply
Rated output current 24VDC, total output 10A
Feedback sampling accuracy 16 bit ADC, CMRR ≥ 80dB@50Hz Power frequency interference suppression
Onboard configuration includes 7 sets of DIP dip switches, 12 sets of jumpers, custom sampling range, and filtering parameters
Two faulty LEDs and one neon light indicate the status, respectively indicating normal power supply, feedback overload, and input power loss
Protection mechanism: overcurrent, overvoltage, undervoltage, short circuit self-locking protection, fault reporting Mark V system alarm
Working temperature -40 ℃~+85 ℃; Humidity 5%~95% RH No condensation
Size/weight 203 × 152 × 44mm, approximately 0.8kg
Official manual GEI-100028
4、 Difference between DS200DCFBG1B and DS200DCFBGBNC cores
Model interface form applicable scenarios
DS200DCFBG1B multi pin ribbon terminal output feedback signal conventional small and medium-sized excitation unit, ordinary shielded cable laying
DS200DCFBG1NC onboard BNC coaxial socket high-power unit, long-distance feedback wiring, high-frequency current sampling, higher anti-interference requirements
5、 Composition of internal hardware modules
AC-DC Switching Power Conversion Circuit: 38/115VAC to Multi channel Stable DC Control Power Supply
High precision feedback sampling and conditioning circuit: differential operational amplifier, reference voltage source, filtering network
BNC/Cable Signal Output Interface Area: BNC version adds coaxial impedance matching circuit
Dial up jumper configuration area: switching current/voltage range, filtering time constant
Fault diagnosis and status indicator light: Real time monitoring of power supply and feedback loop abnormalities
Backplane bus connector: high-speed interaction feedback data and power status with SDCC main control card
6、 Typical application scenarios
Mark V gas turbine supporting EX2000 static excitation system for combined cycle power plant
Large scale steam turbine generator reactive power and voltage closed-loop regulation core sampling unit
Industrial high-power DC speed regulation drive (DC2000) current and voltage feedback acquisition
Excitation power supply and signal monitoring for turbine units in petrochemical and metallurgical self owned power plants
7、 Key points of installation and operation and maintenance
Anti static operation: The precision sampling chip of the board is prone to static electricity breakdown, and an anti-static wristband must be worn for disassembly and assembly
Wiring differentiation: BNC coaxial cables are routed separately, away from power cables and SCR power circuits, to avoid coupling interference
Fault diagnosis: Power LED off → Check CPT transformer input; Feedback red light is always on → current/voltage exceeds the limit, sampling circuit is disconnected
Replacement compatibility: The two models are directly interchangeable, and there is no need to download the excitation configuration again after replacement. Only the range configuration of the dip switch needs to be checked
Mark VI/VIe system cannot be mixed: The VI series uses the DS2100 new generation power feedback board, and the hardware interface is incompatible
8、 List of Supporting Linkage Cards
DS200SDCCG1A (SDCC drive main control card, receives feedback signal to complete excitation PID regulation)
DS200DCFAH1A excitation power rectifier board
DS200PCCAG1ABB System Power Monitoring Board
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