DS200NATOG3ACB GE MarkV, Voltage Feedback Scaling Board

Description:

The DS200NATOG3ACB is a sophisticated Voltage Feedback Scaling board, manufactured by GE, as an integral component of the GE Speedtronic Mark V control system. Its core responsibility lies in managing and scaling down voltage feedback signals originating from an SCR (Silicon Controlled Rectifier) bridge, thereby playing a pivotal role in ensuring precise and reliable feedback measurements by attenuating both AC and DC voltages generated by the bridge.

Functionality & Integration
This board operates by mitigating the high voltages produced by the SCR bridge to safer, more manageable levels suitable for accurate processing within the control framework. It not only performs this critical attenuation function but also integrates seamlessly with other vital control system components. Specifically, it interfaces with a gate distribution and status board responsible for managing gate pulse distribution and status signaling crucial for SCR bridge operation, as well as connecting through a VME backplane that facilitates comprehensive system communication and integration.

Input Configuration
Designed for versatility, the board features five independent strings of precision resistors, each tailored to process distinct types of voltage inputs: three strings for the AC phases and one string each for positive and negative DC bus voltages of the SCR bridge. These strings can be customized via input stab connectors and wire jumpers to accommodate various input voltage levels, offering flexibility with options to scale inputs down to either 6900V, 4200V, 3300V, 2200V, or 1200V, thereby adapting to diverse operational needs and voltage requirements.

Output Design & Protection
The scaled outputs from all five resistor strings converge onto a unified 20-pin ribbon header, serving as the central interface point for further integration within the control system. This consolidated output approach simplifies connectivity and enhances compatibility with additional system components. Safety measures are meticulously incorporated; each output channel includes a metal oxide varistor (MOV) to safeguard against overvoltage conditions. In scenarios where the output circuit might be disrupted while input voltage persists, the MOV intervenes to clamp and restrict voltage surges, preserving system integrity and protecting interconnected hardware from potential damage.

Notably, the burden resistor necessary for precise voltage measurement post-attenuation resides externally on the gate distribution and status board. This architectural decision streamlines the NATO board's primary focus on voltage scaling tasks, while delegating signal conversion duties to the companion board, optimizing overall system functionality and promoting efficient integration within the broader control ecosystem.

Frequently Asked Questions:
1.What is the 20-pin ribbon header used for?
The 20-pin ribbon header consolidates the outputs from the five resistor strings, providing a single connection point for interfacing with other system components

2.How does the MOV protect the board?
The MOV clamps the output voltage to prevent it from rising too high if the output circuit is interrupted while input voltage is still present

Datasheet Link:

DS200NATOG3ACB GE MarkV, Voltage Feedback Scaling Board PDF Datasheet