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The GE DS3800NFTA is a specialized Frequency Transducer Card used in the GE Speedtronic Mark IV series of turbine and generator control systems. It is a legacy part, no longer in production, and is primarily found on the surplus and refurbished markets for the maintenance and repair of these older systems.
Function and Purpose
The primary function of the DS3800NFTA is to accurately measure the frequency of an incoming electrical signal and convert that measurement into a usable format for the main control system. Frequency is a critical parameter in power generation, as it is directly related to the rotational speed of the turbine and generator. Its key roles include:
- Signal Measurement: It takes an AC voltage signal from a source, such as a generator, and measures its frequency.
- Transduction: It acts as a transducer, converting the measured frequency into an analog or digital signal that is proportional to the frequency.
- Signal Conditioning: The card conditions the input signal, filtering out electrical noise and ensuring a stable and accurate measurement, which is crucial for the safe and efficient operation of the turbine.
- Control and Protection: The control system uses the frequency data to perform critical tasks, such as speed control, overspeed protection, and synchronization of the generator to the power grid.
Technical and Design Features
The DS3800NFTA is a robust, industrial-grade circuit board designed to operate in a demanding environment.
- Legacy Part: The “DS3800” prefix indicates that it belongs to the legacy Mark IV series.
- Physical Connectors: The board features two 20-pin connectors and a 34-pin connector, allowing it to interface with other boards and system components in the control rack. It also has a three-pronged terminal for external connections.
- Jumpers and Trimmers: It is equipped with jumpers and a trimmer resistor that allow technicians to configure its operational settings to match the specific requirements of a given application.
- LED Status Indicator: The card includes a red LED that lights up to indicate a fault or a specific operational status, aiding in troubleshooting.
