Part Number: DS200FHVAG2A
Manufacturer: General Electric (GE)
Function: High Voltage Gate Interface Board
Size: 3.25 inches (high) x 5 inches (width)
Operating temperature: 0 to 50 degrees Celsius
No. of Connections: 5
Product type: PCB
Availability: In Stock
Country of Manufacture: United States (USA)
DS200FHVAG2A is a High Voltage Gate Interface Board developed by GE. It is a part of Drive Control system. This special purpose board provides LCI power converter with the necessary SCR gate interface and cell voltage monitoring functions. Each SCR has its own of these boards. The board dimensions are 3.25 inches high by 5 inches wide. This board requires no power supplies because it is passive. It operates in a temperature range of 0 to 50 degrees Celsius, with a 10 degree Celsius rise inside the cabinet. Convection cooling is all that is required. This board contains circuits that provide an isolated gate power path from the Gate Pulse Amplifier board to a single 77 mm SCR. The Interface Board connects the SCR bridge and the LCI power converter, as well as providing cell monitoring functions to the LCI power converter. If you determine that the board is defective, your only option is to order a new board or contact customer service. The board must be installed by a service technician who is familiar with working with high-voltage equipment.
- It serves as an interface between the SCR bridge and the LCI power converter, as well as providing cell monitoring functions to the latter. The board is devoid of serviceable components. If you determine that the board is defective, your only option is to order a new board or contact customer service. The board must be installed by a service technician who is familiar with working with high-voltage equipment.
- Furthermore, there is a risk of injury from the powerful moving parts in a drive or other manufacturing site equipment.
You can troubleshoot the board on your own by taking a few steps. The indicator light is visible on the board. If the red light is illuminated, it indicates that the power bridge is active and that the power blocking voltage is present on the board. Pull the latch on the cable connector to remove the fiber optic cables from the board. It is critical to avoid pulling the cable from the fiber optic cable. To avoid damaging the cable, only pull from the connector.
- It works in temperatures ranging from 0 to 50 degrees Celsius. Inside the cabinet, the temperature rises by 10 degrees Celsius. The only cooling required is convection cooling.
- The STATUS nomenclature can be used to identify Connection U1, which is gray in color. This is the fiber-optic transmitter connection. This connection's output indicates the presence of voltage across the SCR.
- Connection U1 is gray in color and is identified by the STATUS nomenclature. This connection is for the fiber-optic transmitter. The presence of voltage across the SCR is indicated by the output of this connection.
- System communication supports a wide range of communication links including RS232, Arcnet, Ethernet, and GE's Message Service Protocol.
- The manual GEI-100224 contains a part dedicated to application data, which includes guidelines for protecting resistors and fiber-optic transmitters. Specifically, the manual instructs users to short pins P1-1 and P1-2 together when operating the device without an SCR gate connected to it. Additionally, if the device is left without an optical fiber connected for an hour or more, the manual recommends inserting a rubber plug into U1 on the board.
- There is an application data section in the manual. This section of the manual contains information on resistor and fiber-optic transmitter protection. It is powered up without an SCR gate connected to P1, pins P1-1 and P1-2 should be shorted together. It is not connected to an optical fiber for an hour or more, a rubber plug should be inserted into U1.
Gate Pulse Transformer
The gate pulse transformer in the system serves a crucial role in transmitting gate pulses, which are electrical signals used to control the switching of power devices such as thyristors or IGBTs (Insulated Gate Bipolar Transistors). Here is an expanded explanation of the gate pulse transformer and its design features:
- Toroidal Current Transformer (CT): The gate pulse transformer is implemented as a toroidal current transformer. This type of transformer features a toroidal-shaped core with windings that facilitate the transformation of electrical signals. By utilizing a toroidal core, the transformer offers several advantages, including compact size, efficient energy transfer, and reduced electromagnetic interference.
- Soldered to the Board: The gate pulse transformer is soldered directly onto the circuit board of the system. This integration ensures a secure and stable connection between the transformer and the circuitry. Soldering is a common method used in electronic manufacturing to establish reliable electrical connections.
- Single Turn Primary Wire: The gate pulse transformer has a single turn primary wire that is connected to the board. This wire carries the gate pulses, which are low-voltage signals used to control the switching of power devices. The single turn primary wire simplifies the design and enhances the efficiency of the transformer.
- Centering Feature: The board on which the gate pulse transformer is mounted features a hole that allows the single turn primary wire to be centered in the CT window. This design feature ensures precise alignment of the wire within the core window of the toroidal transformer. By centering the primary wire, the transformer's performance is optimized, leading to improved signal transmission and reduced losses.
- The gate pulse transformer's design takes into consideration the presence of electrostatic corona, which is a phenomenon that occurs around high-voltage power wiring. The CT design and its integration into the board enable it to withstand the effects of electrostatic corona. This resistance ensures reliable and stable operation of the transformer, even in environments with potential electrical disturbances.
Gate Termination Circuit
The gate termination circuit plays a crucial role in the control and operation of silicon-controlled rectifiers (SCRs) or thyristors. It performs several functions to ensure proper signal conditioning and connection to the SCR gate leads. Here is an expanded explanation of the gate termination circuit and its key features:
- Rectification of Gate Transformer's Output: The gate termination circuit includes a rectification stage that converts the AC output signal of the gate transformer into a DC signal. This rectification process ensures that the gate signal is in a suitable format for controlling the SCR. Typically, a diode bridge or a combination of diodes is used to achieve the rectification.
- Burden Resistance for Noise Immunity: The gate termination circuit incorporates sufficient burden resistance to provide noise immunity. The burden resistance is connected in series with the gate circuit and serves to limit the current flowing into the SCR gate leads. By selecting an appropriate resistance value, the circuit can effectively suppress noise and interference, enhancing the reliability and stability of the SCR control.
- Connection to SCR Gate Leads: The gate termination circuit is designed to establish a reliable connection to the SCR gate leads. The gate leads are the terminals through which the control signal is applied to the SCR, triggering its conduction. The termination circuit ensures proper electrical contact and secure connection between the gate circuit and the SCR gate leads. This connection is typically achieved using wire connections or dedicated connectors.
- Noise Immunity and Signal Integrity: The gate termination circuit is specifically designed to enhance noise immunity and maintain signal integrity. By rectifying the gate transformer's output and incorporating suitable burden resistance, the circuit minimizes the impact of external noise sources on the gate signal. This is critical to ensure accurate and reliable triggering of the SCR, preventing false triggering or erratic behavior.
SCR Cell Status Circuit
- The board incorporates an SCR (Silicon Controlled Rectifier) Cell Status Circuit, which plays a crucial role in determining the status of the SCR and facilitating proper operation. Let's explore how this circuit functions:
- The SCR Cell Status Circuit on the FHVA (Field Host Voltage Analog) board is responsible for monitoring the operation by sensing the presence or absence of current through a 10K ohm equalizer resistor that is connected in parallel. This equalizer resistor helps balance the voltage distribution among multiple and ensures uniform operation.
- When the it is in the OFF mode or if it has failed, it behaves as a short circuit, diverting most of the current away from the equalizer resistor. In this state, little to no current flows through the resistor. This condition is detected by the Cell Status Circuit, indicating that the SCR is not functioning as intended.
- However, when the Rectifier is in the ON state, it blocks the flow of current and allows equalizer current to pass through the 10K ohm equalizer resistor. This equalizer current flows through a detection circuit on the FHVA board and continues to the next equalizer resistor in the circuit. This flow of current through the equalizer resistor confirms that the SCR is properly blocking voltage, indicating normal operation.
- The presence of at least 50 volts is crucial for the operation of the fiber optic transmitter. This voltage threshold is necessary to activate the transmitter and ensure the transmission of optical signals. By maintaining a voltage level above this threshold, the Cell Status Circuit ensures that the fiber optic transmitter operates reliably.
- The SCR Cell Status Circuit on the board enables continuous monitoring of the SCR's operation and promptly detects any deviations or failures. This circuit serves as a vital diagnostic tool, providing feedback on the status of the SCR and helping to identify potential issues or abnormalities. By accurately determining the SCR's operational state, the circuit contributes to system reliability, performance, and safety in applications where SCRs are utilized.
Direct Interface Sensor
- Direct Communication: The Mark V I/O modules are designed to enable direct communication with various turbine and generator devices. This direct interface eliminates the need for additional signal conditioning or conversion devices, simplifying the system architecture and reducing associated costs.
- Elimination of Interposing Transducers: By connecting the sensors directly to the Mark V system, the cost and potential reliability issues associated with interposing transducers are eliminated. Interposing transducers are devices used to convert one type of sensor output into a different format compatible with the control system. Direct interface sensors eliminate the need for such additional devices, streamlining the system and reducing potential points of failure.
- Operator Visibility: The data acquired from the direct interface sensors is made readily available to the operator via the communication link between the Mark V interface and the Distributed Control System (DCS). This allows operators to monitor and analyze the sensor data, providing them with real-time insights into the turbine and generator performance and condition.
- Specific Sensor Applications: The direct interface sensors in the Mark V system are tailored to various applications in turbine control. For example, thermocouples and RTDs are used for temperature measurement, while vibration sensors are employed for monitoring the vibration levels of critical components. Proximity probes are utilized to protect against excessive vibration and axial position deviations, ensuring proper thrust wear, differential expansion, and eccentricity control. Additionally, an LVDT (Linear Variable Differential Transformer) input is available for monitoring shell expansion.
- Open Architecture: The I processor features an open architecture, which enables compatibility with different communication links. This open architecture allows for flexibility in selecting the most suitable communication protocol based on specific system requirements and compatibility with the DCS.
- Internal Arcnet Communication: The Mark V system includes an internal Arcnet communication link. This internal communication link is isolated from external communication links, ensuring secure and reliable communication within the Mark V system.
- RS232 Link with Modbus Protocol: To ensure compatibility with most DCSs, offers an RS232 link that supports the Modbus protocol. RS232 is a widely used serial communication standard, and the Modbus protocol is a popular industry-standard protocol for data exchange between devices in industrial automation systems. This link allows for seamless integration and communication with a wide range of DCSs.
- Arcnet and Ethernet Communications: In addition to RS232, system supports communication through Arcnet and Ethernet protocols. Arcnet is a local area network protocol commonly used in industrial automation applications, offering reliable and efficient communication between devices. Ethernet, a widely adopted networking standard, provides a fast and versatile communication link suitable for connecting the board to Ethernet-enabled devices or network infrastructure.
- GE's Message Service Protocol (TCP-IP): GE's Message Service Protocol, based on the TCP-IP (Transmission Control Protocol/Internet Protocol) suite, is utilized for communication. This protocol allows for the transmission of individual time tags for alarms and events, as well as synchronization of time with the DCS. The Message Service Protocol can be implemented over a variety of communication links, including RS232 and Ethernet, offering flexibility in establishing communication between the board and the DCS.
- Controlling Multiple Units: Capable of controlling multiple units over a single communication link. However, efficient communication with multiple units often requires faster communication links and more sophisticated protocols. Ethernet with TCP-IP is commonly used in such cases, as it provides higher data transfer rates and supports advanced features such as packet routing and error detection, ensuring reliable and efficient communication between the board and multiple units.
- Redundant Communication Links: Within the Mark V system, redundant communication links are available at various levels to ensure high availability and fault tolerance. Redundancy can be achieved through redundant Is (processor modules) or redundant Is with redundant communication modules. Redundant communication links enhance system reliability and provide seamless failover in case of a communication link failure.
WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.
FREQUENTLY ASKED QUESTIONS
What is DS200FHVAG2A?
It is a High Voltage Gate Interface Board developed by GE
What function does FHVA provide to the LCI power converter?
FHVA provides the LCI power converter with the necessary SCR gate interface and cell voltage monitoring functions.
Does the board require power supplies?
No, the board does not require power supplies because it is passive.
What is the operating temperature range of the component?
It operates in a temperature range of 0 to 50 degrees Celsius, with a 10 degree Celsius rise inside the cabinet.
What type of cooling is required for the board?
Convection cooling is all that is required for the board.
What circuits does the component contain?
It contains circuits that provide an isolated gate power path from the Gate Pulse Amplifier (FGPA) board to a single 77 mm SCR.