DS200DCFBG1B DC Feedback Power Supply Excitation Control Board

Description

1. Product Overview

GE DS200DCFBG1B (suffix LC / BNC only differ in connector assembly) is a DC Feedback Power & Exciter Control Board belonging to GE Speedtronic Mark V DS200 turbine control series, manufactured in the United States.

DCFB stands for DC Feedback Board, integrating three core functions: system regulated power supply, motor field excitation drive, and closed-loop DC voltage/current/speed feedback signal conditioning.

It serves as the central power hub and speed regulation core for Mark V gas/steam turbine control systems, as well as EX2000, DC2000, AC2000 heavy-duty industrial drive platforms. It generates multi-channel logic power for rack modules, drives excitation windings, collects armature & tachometer generator feedback signals, converts analog signals to frequency pulses via VCO circuit, and realizes hardware closed-loop speed control to prevent unit overspeed and runaway faults.This is an End-of-Life legacy spare part, mainly used for maintenance and replacement of old power generation and heavy industry equipment.

2. Hardware Structure & Functional Units

2.1 Isolated Switching Power Supply Unit

Accepts wide-range AC input 38~115VAC, converts to multiple isolated regulated DC outputs: ±5V, ±15V, 24VDC for control cards; also provides 115VAC dedicated power for cabinet cooling fans. Each output branch is protected by independent fuse to avoid full-board shutdown from single-channel short circuit.

2.2 Excitation Power Drive & Field Control Unit

Dedicated power drive circuit outputs adjustable DC excitation voltage to motor/turbine field windings, with soft-start current limiting to eliminate inrush current and protect field coils, supporting flux weakening speed regulation and constant torque excitation control.

2.3 Feedback Sampling & VCO Signal Conversion Unit

Samples armature voltage, armature current and TG tachometer signals, filters and amplifies input signals, then uses Voltage Controlled Oscillator to convert analog values into frequency pulses and upload to upper SDCC main control board. Sampling accuracy ≤±0.1%FS to ensure stable closed-loop speed PID regulation.

2.4 Configuration Unit: Jumpers & DIP Switches

Equipped with 12 configurable jumpers + 7-bit DIP DIP switches to configure input voltage range, excitation output range, feedback threshold, fan enable, fault logic and rack address, compatible with all GE mainstream drive systems without hardware modification.

2.5 On-Board Diagnosis & Indication Unit

2 LED indicators + 1 neon lamp display power status, fuse blow and excitation faults; 5 reserved test points allow field multimeter measurement of power rails and feedback signals without upper configuration software. Fault state is hardware latched and requires power cycle reset to clear.

2.6 Backplane Bus & External Interface Unit

Rear multi-pin connector plugs into Mark V rack parallel backplane bus for data communication with main controller and I/O terminal boards. Edge terminal sockets connect AC input, excitation output, feedback wiring and fan power via detachable ribbon cables for easy on-site wiring.

3. Technical Specifications

3.1 Electrical Parameters

Part Number: DS200DCFBG1B
AC Input: 38~115VAC, 0~500Hz
Regulated Output: ±5V, ±15V, 24VDC isolated DC
Aux Output: 115VAC for cabinet fans
Feedback Input: 0~10VDC voltage, 0~20mA current, TG pulse signal
Protection: Independent fuses, TVS surge suppression, reverse polarity, overvoltage/undervoltage/overcurrent hardware interlock
Typical Power Consumption: 28W
Bus: Dedicated Mark V DS200 rack parallel backplane bus

3.2 Environmental & Mechanical

Operating Temp: -30℃ ~ +70℃; Storage Temp: -40℃ ~ +85℃
Humidity: 5%~95%RH non-condensing, no corrosive vapor
Ingress Protection: IP20 (cabinet mounting only)
Vibration Standard: IEC 60068-2-6
Max Altitude: ≤2500m
Dimension: 240mm × 175mm × 35mm; Net Weight: ~650g

4. Key Product Features

All-in-one integration of power supply, excitation drive and feedback acquisition, reducing rack slot occupation and system fault points.
Hardware closed-loop speed control independent of host software, preventing turbine overspeed even if main CPU crashes.
Universal configuration via jumpers and DIP switches for plug-and-play replacement across multiple GE drive platforms.
Branch-level fuse isolation ensures partial-load operation upon single circuit failure to avoid unplanned unit trip.
Conformal coated wide-temperature industrial PCB design for long-term 24/7 continuous operation in power plant harsh environments.

5. Application Fields

Power Generation: Mark V gas & steam turbine generator unit control systems.
Heavy Industry: Steel rolling mill DC main drives, mine hoist and blast furnace equipment variable speed drives.
Petrochemical: Reciprocating compressor and turbo booster EX2000 drive control systems.
Maintenance: Spare part replacement and fault troubleshooting for legacy GE DS200 series control systems.