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The GE DS3800NDAC is an Analog Output Card used in the GE Speedtronic Mark IV series of turbine 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 older systems.
Function and Purpose
The primary function of the DS3800NDAC is to convert digital signals from the main control system into analog signals that can be used to control various devices. In a turbine control system, the main processors operate on digital data, but many of the components they control, such as valves, actuators, and motors, require a continuous analog signal (e.g., a voltage or current). The card’s key roles include:
- Digital-to-Analog Conversion (DAC): The board takes a digital command from the control system and converts it into a continuous analog signal. This signal is then sent to a device to precisely control its position or output.
- Precise Control: By providing a continuous analog signal, the card allows for fine, incremental adjustments to the equipment it controls. For example, it can modulate a valve to a specific percentage of its opening rather than simply opening or closing it.
- Multi-Channel Output: The card features 12 channels, allowing it to simultaneously control multiple devices. This is crucial for a complex system that requires the coordination of numerous components in real time.
Technical and Design Features
The DS3800NDAC 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, a pioneering control system for gas and steam turbines in the late 1980s.
- Connectors: The board is designed for quick installation in a drive. It features a large black plastic female port with forty prong slots and a small male port with a blue case and two clips.
- EEPROMs: The board contains twelve EEPROMs (Electrically Erasable Programmable Read-Only Memory) that are preloaded with essential data and can be reprogrammed if updates are needed.
- Adjustable Components: It includes eight blue potentiometers, each adjustable via a small screw on the top, allowing technicians to calibrate and fine-tune the output signals.
- Diagnostics: The card features an amber LED light that illuminates when current flows through it, providing a visual status of its operation.
