Product:DS200NATOG3ACB GENERAL ELECTRIC CIRCUIT BOARD

DS200NATOG3ACB is a Voltage Feedback Scaling board developed by GE. It is part of the GE Speedtronic Mark V control system. It manages and scales voltage feedback from an SCR (Silicon Controlled Rectifier) bridge. Its primary function is to attenuate both AC and DC voltages produced by the SCR bridge, which is essential for accurate feedback measurement.

Features

• The board works by reducing the amplitude of the high voltages generated by the SCR bridge to levels that can be safely and accurately processed by the control system. This attenuation ensures that the feedback signals from the SCR bridge are precise and reliable.
• In addition to its attenuation role, the board integrates with other critical components of the control system. It collaborates with a gate distribution and status board, which manages the distribution of gate pulses and status signals needed for the SCR bridge's operation. The board also interfaces with a VME backplane, which provides the necessary connectivity and communication pathways for system integration.
• By attenuating the SCR bridge voltages and working in conjunction with the gate distribution board and VME backplane, the board ensures that voltage feedback is accurately scaled and effectively integrated into the control system. This contributes to the overall stability and performance of the electrical system.

Input

• The board is designed with five identical series-connected strings of precision resistors. These strings are specifically arranged to handle different types of voltage inputs.
• There is one string dedicated to each of the three AC phases of the SCR bridge, as well as one string each for the positive and negative DC bus voltages.
• Each resistor string can be configured to handle various input voltages through a combination of input stab connectors and wire jumpers.
• The board offers a choice of three different input stab connectors and two wire jumpers, allowing for attenuation of input voltages to five specific levels: 6900 volts, 4200 volts, 3300 volts, 2200 volts, or 1200 volts. This configurability ensures that the board can be tailored to accommodate different voltage requirements and operational conditions.

Output

• The outputs from the five resistor strings are consolidated into a single 20-pin ribbon header. This ribbon header serves as the primary connection point for interfacing with other components within the control system. By using a 20-pin ribbon header, the NATO board efficiently channels the scaled voltage signals from all five strings into one cohesive output interface, facilitating easier integration with other system elements.
• To ensure the safety and reliability of the output signals, each output is equipped with a metal oxide varistor (MOV). The MOV plays a crucial role in protecting the system against excessive voltage conditions. If the output ribbon circuit is interrupted while input voltage is still present, the MOV acts to clamp and limit the voltage, preventing it from rising to levels that could potentially damage the system or other connected components. This protective measure helps maintain the integrity of the output signals and ensures that the system operates within safe voltage parameters.
• The burden resistor, which is essential for accurate voltage measurement and signal scaling, is not located on the board itself. Instead, it is situated on the gate distribution and status board. This design choice allows the board to focus on its primary function of voltage attenuation and scaling, while the burden resistor, located on the gate distribution and status board, manages the conversion of the attenuated signals into measurable voltage values. This arrangement helps streamline the functionality of the NATO board and ensures effective integration with the broader control system.

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