IS210MVRCH1A - PWA Assembly Board

SPECIFICATIONS

Part Number: IS210MVRCH1A
Manufacturer: General Electric
Product Type: PCB
Series: Mark VIe
C Core Installation: Place in Vacant Location 2
Weight: Less than 5 lbs
Number of Mounting Holes:12
Number of Ports: 15
Abbreviation: MVRC
Function: PWA Assembly Board
Availability: In Stock
Manual: GEH-6731
Country of Manufacture: United States (USA)

Functional Description

IS210MVRCH1A is a PWA Assembly Board developed by GE. It is a part of Mark VIe excitation system. General Electric created this PWA Assembly for the larger C core System. This board is made up of the base PCB and the High-Speed Serial Link board. These modules aid cores in the management of steam or gas turbine systems. This specific unit is made up of separate PCBs that come together to form the fully functional PWA Assembly. This assembly is made up of two separate boards: High-Speed Serial Link Board and the MVRC Base Board. These boards are linked together via ports located between the MVRC's four mounting brackets. By considering redundancy, installation quality, and long-term performance factors, the system can maintain reliable and continuous control of the turbine from the central control room. Implementing redundancy measures and ensuring proper installation and maintenance practices for fiber-optic links help minimize potential disruptions and ensure optimal performance throughout the life of the plant.

IS210MVRCH1A Features

• PCB-Based Design: Composed of separate printed circuit boards (PCBs) that are integrated to form the fully functional PWA (Printed Wiring Assembly) assembly. This modular design allows for easier maintenance, troubleshooting, and potential upgrades or replacements of individual PCBs within the unit.
• High-Speed Serial Link Board: The MVRCH1A assembly includes the High-Speed Serial Link Board, which serves as a key component. This board facilitates high-speed data communication and connectivity within the Mark VIe system. It enables efficient exchange of information between different system components, enhancing overall system performance and coordination.
• Base Board: The other significant component within the assembly is the Base Board. This board provides the foundation and additional functionality for the unit. It supports the necessary interfaces, connections, and circuitry required for the proper operation of the MVRCH1A and its integration within the larger Mark VIe system.
• Port Connectivity: Features multiple ports to accommodate various cables and connections. These ports include JAA, JBB, JCC, JDD, JAR, JAS, JAT, and optional ports such as JHH and JII. These ports serve as the interface points for connecting cables that carry data, signals, or power to and from the MVRCH1A. They ensure proper communication and integration with other system components or external devices.
• Individual Board Availability: The High-Speed Serial Link Board and the Base Board within the assembly are available separately. This availability allows for flexible replacement or individual purchase of the boards as needed, offering convenience and cost-effective options for maintenance or customization requirements.

Mark VIe Architecture

• The system's heart is a single-board controller. It contains the main processor as well as redundant Ethernet drivers for communicating with networked I/O, as well as additional Ethernet drivers for the control network. For the main processor and I/O, a QNX real-time, multitasking operating system is used.
• The application software is written in a control block language that can be customized and is stored in non-volatile memory. IEEE-854 32-bit floating-point format is used. IONet is a dedicated, full-duplex, point-to-point protocol that provides a deterministic, high-speed 100 MB communications network with a fiber interface for local or remote I/O. It communicates between the main processor(s) and networked I/O blocks known as I/O packs.
• Each I/O pack is attached to a board using barrier or box-type terminal blocks. Two Ethernet ports, a power supply, a local processor, and a data acquisition board are included in the I/O pack.
• As I/O packs are added to the control system, computational power increases, allowing for an overall control system frame rate of 10 ms in simplex, dual, or triple redundant configuration. Because some process subsystems require even more performance, the local processors in each I/O pack run algorithms at higher rates as needed by the application.

Guidelines on cables usage

• Avoid Gel-Filled Cables: Gel-filled or loose tube cables should be avoided due to installation and termination difficulties, as well as the potential risk of leakage in vertical runs. Instead, opt for alternative cable designs that offer easier installation and termination processes.
• Use High-Quality Breakout Cables: Opt for high-quality breakout cables that provide individual fiber strength and help prevent sharp bends. These cables have added protection to ensure the fibers are not susceptible to damage during installation or handling.
• Reinforced Sub-Cables: Sub-cables within the main fiber-optic cable should be combined with additional strength and filler members. This reinforcement enhances the overall cable strength and makes it more resistant to mechanical stress and environmental factors.
• Consider Armored Cables: Depending on the plant environment, it may be necessary to use armored cables. Rodent damage is a common cause of optical cable failure, so if rodent infestation is a concern, armored cables should be employed. Despite their heavier weight, larger bend radius, increased cost, susceptibility to lightning currents, and lower impact and crush resistance, armored cables offer superior protection against rodent-related damage.
• Optical Time Domain Reflectometer (OTDR) Measurements: Utilize an optical time domain reflectometer (OTDR) to measure the optical properties of the installed cable. OTDR measurements provide valuable information about the cable's attenuation and overall quality. Some manufacturers may provide OTDR printouts as evidence of cable quality. Additionally, attenuation measurements can be conducted using simpler instruments, and the installer should provide this data to demonstrate the installation's power margin.
• Consider Spare Fibers: The cables described in the guidelines typically have four fibers, which is sufficient for two fiber-optic links. This configuration is beneficial for establishing redundant communications to a central control room. Any extra fibers can be saved as spares for future plant improvements or expansion. In cases where only two fibers are needed, there are indoor cables available specifically designed for this purpose.

System Features

• Redundancy: To ensure uninterrupted access to the turbine controls from the central control room, redundancy is recommended. Redundant components such as redundant Human-Machine Interfaces (HMIs), fiber-optic links, Ethernet switches, and power supplies should be implemented. Redundancy minimizes the risk of system failure due to component malfunction or disruption, providing reliability and continuity of control.
• Installation Quality: During the installation of fiber-optic links, it is important to ensure high-quality installation practices. It should be noted that the performance of the fiber can be affected during the installation process compared to factory-new cables. It is crucial for installers to have expertise in making proper connections and terminations to minimize loss and maintain optimal performance.
• Aging and Degradation: Over time, various factors can impact the performance of fiber-optic links. LED light sources can gradually dim, connections can become dirty or loose, cable loss can increase with age, and the receiver's sensitivity may decrease. These factors can lead to degraded signal quality and reduced transmission capabilities. Therefore, it is essential to consider these factors and implement measures to mitigate their effects.
• Power Budget and Link Loss Budget: To ensure reliable and long-lasting fiber links, a minimum 3 dB margin is recommended between the available power budget and the link loss budget. This margin provides a buffer to compensate for any potential loss or degradation in the fiber link. Additionally, a more comfortable 6 dB margin can be implemented to provide an even higher level of assurance and extend the lifespan of the fiber link.

Communications

In the Mark VIe control system, effective communication between various components and devices is essential for smooth operation and efficient data exchange. The system offers robust communication capabilities to facilitate reliable and fast communication within the control network. Here are the key features and details about system communications:

• Peer-to-Peer Communication: The system allows packs to be configured for peer-to-peer communication on the I/O network. This means that devices connected to the network can directly communicate with each other without the need for intermediate devices or complex routing. Peer-to-peer communication offers fast response times and low latency, making it ideal for applications that require immediate data exchange and real-time interaction between devices.
• IEEE 802.3u Communication: The communication protocols used in the system adhere to the IEEE 802.3u standard. This standard governs the implementation of 100 MB Ethernet, which provides a reliable and high-speed communication infrastructure. By following the IEEE 802.3u guidelines, the system ensures compatibility and interoperability between different devices and network components.
• Star Topology and Connectivity: The system utilizes a star topology for its communication network. In a star topology, devices are connected to a central network switch, enabling efficient communication and simplified network management. The system supports both category 5 and fiber connectivity options, allowing for flexible and scalable network configurations based on specific application requirements.
• Distance and Wiring Considerations: With the system's communication infrastructure, each network can accommodate up to 199 I/O packs. These packs can be located up to 300 meters (984 feet) away from the network switches using category 5 wire. Category 5 wire is a widely adopted standard for network cabling, providing reliable data transmission capabilities over significant distances. This allows for flexible placement of devices within the control system, accommodating diverse plant layouts and requirements.

WOC is happy to assist you with any of your automation requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.

FREQUENTLY ASKED QUESTIONS

What is IS210MVRCH1A?
It is a PWA Assembly Board developed by GE

Are the High-Speed Serial Link Board and the Base Board available separately?
Yes, both the High-Speed Serial Link Board and the Base Board are available separately on the website.

What is the benefit of using fiber-optic transmission in power plants?
Fiber-optic transmission provides lower signal attenuation, resistance to electrical disturbances, and the ability to pass through electrically noisy areas without interference.

What is a breakout cable?
A breakout cable is a high-quality cable that strengthens each fiber and helps prevent sharp bends.

Why are two types of fiber-optic cable recommended for use in power plants?
Two types of cable are recommended - one with armor and one without - to address the issue of damage from rodents, which is a major cause of optical cable failure.

What ports does the component have?
It has ports for the following cables- JAA, JBB, JCC, JDD, JAR, JAS, JAT, Optional JHH, and JII.