SPECIFICATIONS
Part Number: DS200FCGDH1BBA
Manufacturer: General Electric
Series: LCI
Product Type: Gate Distribution and Status Board
Size: 9.2x6.3 inches
Temperature 0 to 60oC (32 to 149 oF)
Availability: In Stock
Country of Manufacturer: United States (USA)
Functional Description
DS200FCGDH1BBA is a Gate Distribution and Status Board developed by General Electric. It is a part of LCI innovation series. The Gate Distribution and Status Card (FCGD) serves as a pivotal component in the interface and control system architecture for a 6-pulse phase-controlled non-reversing bridge configuration. The board is designed to the 6U VME standard, measuring 9.2x6.3 inches in size. This standardization ensures compatibility with VME racks commonly used in industrial applications. Additionally, the board features a robust construction with six layers and surface-mounted devices (SMDs) on both sides. This design enhances durability and reliability, crucial for operation in demanding environments.
Features
- Interface Functionality: As an interface board, the FCGD facilitates communication between the control system and the components of the 6-pulse phase-controlled non-reversing bridge. It plays a vital role in decoding firing signals, distributing gating signals, and receiving feedback and diagnostic information from the bridge components. This seamless integration ensures precise control and monitoring of bridge operation.
- Mounting Location: The board is strategically designed to mount within the same VME rack housing the Digital Signal Processing Card (DSPC). This co-location streamlines system integration and allows for centralized control and management of bridge operations. By sharing the same rack space, the FCGD and DSPC work in tandem to optimize system performance and functionality.
- Contribution to System Reliability and Efficiency: Through its interface capabilities and strategic mountin: location, it significantly contributes to the reliability and efficiency of the overall system. By facilitating seamless communication and control between the control system and bridge components, the FCGD ensures synchronized operation and optimal performance of the 6-pulse phase-controlled non-reversing bridge configuration.
Current Feedback
- Feedback Sources: Current feedback is sourced from two Current Transformers (CTs) on the source side or two LEM® modules on the load side, strategically positioned on phases A and C of the power bridge. These sensors accurately measure the current flowing through the respective phases, providing essential feedback data.
- Signal Conditioning: The raw current signals obtained from the CTs or LEM modules undergo signal conditioning to ensure accuracy and reliability. Conditioning involves processing the signals to obtain IA, IB, and IC signals, representing the currents in phases A, B, and C, respectively.
- Voltage-Controlled Oscillator (VCO) Feedback Circuits: The IA and IC current signals are fed into Voltage-Controlled Oscillator (VCO) feedback circuits. These circuits play a crucial role in regulating the operation of the power bridge by adjusting the switching frequency based on the current feedback. By modulating the switching frequency, the system can maintain stable current flow and regulate power output.
- Offset Drift Minimization: To ensure accurate and consistent feedback over time and temperature variations, the current feedback circuit includes mechanisms to minimize offset drift. This ensures that the feedback signals remain precise and reliable, even in challenging operating conditions.
- Testpoints for Monitoring: The IA and IC current signals are made accessible through board-front testpoints, allowing for convenient monitoring and troubleshooting. Operators can use these testpoints to verify the integrity of the current feedback signals and diagnose any potential issues with the power bridge system.
Hardware Overcurrent
- vercurrent Detection Mechanism: The hardware overcurrent detector receives three current signals, IA, IB, and IC, which are combined to form an aggregated signal, IFB. This aggregated signal represents the total current flow within the system. The hardware overcurrent detector continuously monitors the IFB signal for any signs of excessive current flow.
- Overcurrent Level Setting: The overcurrent protection level is set using a potentiometer labeled OC SP located on the front of the board. This potentiometer allows operators to adjust the threshold at which the overcurrent protection is triggered. By setting the appropriate overcurrent level, operators can tailor the protection mechanism to suit the specific requirements of the system.
- Overcurrent Triggering: If the IFB signal exceeds the set overcurrent level for approximately 26 milliseconds, indicating a sustained period of excessive current flow, the FCGD triggers an overcurrent signal. This signal serves as an alert to indicate that the overcurrent protection mechanism has been activated.
- Resetting Overcurrent Protection: Once triggered, the overcurrent protection signal can only be cleared by performing a hardware reset. This ensures that any potentially hazardous conditions resulting from overcurrent events are thoroughly addressed before normal operation can resume.
- Monitoring Overcurrent Protection: Operators can monitor the operation of the overcurrent protection mechanism through visual indicators located on the board front. The IFB signal level can be read at the board front testpoint labeled OCSP. Additionally, a red LED lamp labeled OC illuminates to indicate the activation of the overcurrent protection mechanism when triggered.
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FREQUENTLY ASKED QUESTIONS
What is DS200FCGDH1BBA?
It is a Gate Distribution and Status Board developed by General Electrics.
What is hardware overcurrent protection?
Hardware overcurrent protection is a safety feature implemented in power systems to prevent damage caused by excessive current flow. It continuously monitors current levels and triggers protective measures if an overcurrent condition is detected.
How is overcurrent detection achieved in the described system?
Overcurrent detection is achieved by combining three current signals (IA, IB, and IC) to form an aggregated signal, IFB. This aggregated signal is compared against a set threshold using a hardware overcurrent detector.
How is the overcurrent protection level set?
The overcurrent protection level is set using a potentiometer labeled OC_SP located on the front of the board. Operators can adjust this threshold to customize the protection mechanism according to the specific requirements of the system.
What happens when an overcurrent event is detected?
If the IFB signal exceeds the set overcurrent level for approximately 26 milliseconds, indicating sustained excessive current flow, the FCGD triggers an overcurrent signal. This signal serves as an alert, indicating that the overcurrent protection mechanism has been activated.
How is the overcurrent protection reset?
Once triggered, the overcurrent protection signal can only be cleared by performing a hardware reset. This ensures that any potentially hazardous conditions resulting from overcurrent events are thoroughly addressed before normal operation can resume.
