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　　IS215VPROH2BC Other names:

　　PCB module IS215VPROH2BC

　　IS215VPROH2BC turbine protection plate

　　Emergency trip board IS215VPROH2BC

　　IS215VPROH2BC main processor board

　　IS215VPROH2BC is a specialized circuit board developed by General Electric (GE) and is part of the Speedtronic MKVI gas turbine control system. This circuit board is used as an emergency turbine protection circuit board, providing an independent emergency overspeed protection system for the MKVI system. It aims to manage gas/steam turbines to ensure their safe operation under various conditions.

　　Regarding IS215VPROH2BC

　　The IS215VPROH2BC model is designed as a turbine emergency trip board and turbine protection board. It is mainly used as an input/output processor board for TPRO and TREG boards. TREG board is the model used for the interface between VPRO and turbine emergency trip board. TPRO models are used together with VPRO for turbine protection applications.

　　When the VPRO model is used with the TREG board, the I/O signal types include energy-saving relays, emergency stop inputs, trip interlock inputs, and trip solenoid valve drivers. Each processor also has a certain amount of I/O. For example, each available TREG board has seven trip interlock inputs and three trip solenoid valve drivers. Please note that when the IS215VPROH2BC model is operated as a turbine emergency trip processor board, it can also be connected to the TPRO terminal board through an Ethernet cable.

　　When the IS215VPROH2BC board is used for protective module applications, the main purpose is to ensure that the selected turbine does not experience any type of overspeed. One thing to note when operating this model is that it will always have triple redundancy and will have three completely independent and separate parts named X, Y, and Z. This model is capable of shutting down one part of the turbine during operation without compromising the protection system.

　　features

　　Triple redundant board: The triple redundant board is located inside a dedicated protection module. This setting ensures a highly reliable and fail safe emergency overspeed protection system.

　　Independent emergency trip function: The VPRO board in the protection module specifically provides emergency trip function. This ensures that in emergency situations, the system has an independent mechanism to initiate emergency shutdown, which helps ensure the safe operation of the turbine.

　　Ethernet connection for IONet communication: In addition to its main functions, the board is also equipped with an Ethernet connection for IONet communication with the control module. This feature facilitates seamless communication and data exchange between VPRO and other control components, thereby improving the overall efficiency of the turbine protection system.

　　Trip solenoid valve connection: A maximum of three trip solenoid valves can be connected between the TREG and TRPG terminal blocks. The TREG terminal block provides the positive pole of the 125 V DC power supply for the solenoid valve, while the TRPG terminal block provides the negative pole for the solenoid valve. This double-sided power supply configuration ensures redundancy and flexibility of the trip solenoid valve control system.

　　Emergency overspeed and shutdown function: This board is responsible for controlling emergency overspeed protection and emergency shutdown functions. This critical role enables the system to quickly respond to overspeed or emergency situations, ensuring safe shutdown of the turbine.

　　Relay control on TREG: TREG plays an important role in the system by controlling 12 relays. Nine relays form three groups of three each, implementing a voting mechanism for controlling the inputs of the three trip solenoids. This redundancy in relay control enhances the reliability of the protection system.

　　Power supply

　　Each circuit board is equipped with a dedicated onboard power supply. This independent power supply is designed to ensure the necessary voltage for the optimal operation of the circuit board.

　　The onboard power supply can generate 5 V DC and 28 V DC. These voltages are crucial for powering various components and functions within the circuit board, facilitating its comprehensive operation.

　　The onboard power supply obtains power from the cabinet distribution module (PDM) with a voltage of 125 V DC. This centralized power supply is a reliable and consistent foundation that ensures stable power supply for the VPRO board.

　　Each VPRO board is equipped with its own onboard power supply, and the entire protection module has three independent power supplies. Power redundancy enhances the reliability of the system and minimizes the impact of potential power failures.

　　TREG is a terminal board related to the protection system, completely controlled by these boards. This centralized control mechanism simplifies the coordination and operation of the turbine protection system.

　　The only connection between TREG and the control module involves J2 power lines and trip solenoid valves. This simplified and direct connection scheme improves the efficiency and reliability of the control architecture.

　　In the simplex system, the third cable extends from J1 to the TSVO (Turbine Servo Valve Output) terminal block. This additional cable helps to transmit the trip signal to

　　TSVO terminal board is used to achieve the clamping function of the servo valve when the turbine trips.

　　The TSVO terminal block contains a trip signal, providing a crucial safety function for simplex systems. This function ensures that the servo valve clamping device is activated when the turbine trips, thereby facilitating controlled and safe shutdown of the turbine.

　　The centralized control of TREG by VPRO and the simplified connection with control modules help achieve an efficient and streamlined control architecture. This design method facilitates easy communication and coordination between various components.

　　The addition of redundant power supplies and direct control of TREG emphasize the focus on redundancy and reliability. These features minimize the risk of system failure and ensure the continuous and reliable operation of the turbine protection system.

　　Integrating the trip signal into the TSVO terminal block in a simplex system demonstrates a commitment to safety. The servo valve clamping function provides an additional protective layer to ensure controllable closure in emergency situations.

　　Diagnosis of automatic synchronization function

　　K25A relay (synchronous check) driver mismatch request status:

　　This diagnostic message indicates that the requested state of the K25A relay (used for synchronization check) driver does not match its actual state.

　　This mismatch indicates that the VPRO system is unable to establish a current path from VPRO to the TREx (terminal relay extension) terminal board.

　　Possible causes of this issue include wiring faults, improper connections, or relay driver failures. It may also indicate differences in the configuration or settings of relay drivers.

　　Resolving this issue involves troubleshooting the relay driver circuit, verifying the integrity of the wiring connections, and ensuring the correct configuration of the relay driver settings.

　　K25A relay (synchronous check) coil fault, connected to P28V on TTUR:

　　This diagnostic message indicates a fault in the K25A relay coil used for synchronous inspection, specifically related to the wiring between the TREx and TTUR (Terminal Conversion Unit Remote) terminal boards.

　　The problem may stem from various issues, such as an open circuit between the TREx and TTUR terminal boards, or a lack of P28 V power supply on the TTUR terminal board.

　　Cable breakage or power loss can cause the K25A relay coil to malfunction, resulting in failed synchronization checks and potential synchronization issues.

　　The troubleshooting steps include checking the cable between TREx and TTUR terminal boards, checking continuity, and ensuring that the P28 V power supply on the TTUR terminal board is available.

　　Main features and specifications

　　Function: IS215VPROH2BC can be used as both an emergency trip board for turbines and a turbine protection board, as well as an input/output processor board for TPRO and TREG boards within the MKVI system.

　　Redundancy: Adopting a triple redundancy design, it has three completely independent and independent parts (X, Y, Z) to enhance reliability and prevent single point failures.

　　I/O function: This board has three analog current inputs and nine thermocouple inputs, typically used for exhaust overheat protection in gas turbines. It also controls the trip solenoid valves through the TREG board, and each VPRO board can control up to three trip solenoid valves.

　　Communication: Communicate with the controller through IONet (Ethernet communication) to ensure seamless data exchange and integration within the control system.

　　Physical design: The front panel includes a power switch, LED indicator lights, D-type cable connectors, and Ethernet connectors. The circuit board is equipped with various electronic components, including transistors, integrated circuits, resistors, capacitors, and diodes, as well as transformers, heat sinks, and testing points.

　　Operating environment: The operating temperature range is -30 to 65 ° C, powered by a 125V DC power supply.

　　Technical features

　　High reliability: As a key component of the turbine control system, IS215VPROH2BC needs to have high reliability to ensure stable operation in harsh industrial environments.

　　Advanced control algorithms: may integrate GE's advanced control algorithms to improve the operational efficiency and stability of the turbine.

　　Modular design: easy to install, maintain, and upgrade, reducing the overall cost of the system.

　　Application

　　Gas/Steam Turbine Control: IS215VPROH2BC is an essential part of gas/steam turbine operation, providing critical protection for overspeed and other emergency situations.

　　Security and reliability: The triple redundancy design ensures high availability and reliability, which is crucial for maintaining uninterrupted operation in critical applications.

　　Installation and maintenance

　　Installation steps: After manually positioning the edge connector, slide the VPRO board into place and tighten the fixing screws at the top and bottom of the front panel. Then open the VME rack and check the diagnostic lights on the front panel.

　　Maintenance: It is recommended to regularly inspect and maintain the circuit board to ensure that it continues to function optimally in the turbine control system.

　　Summary

　　IS215VPROH2BC is a key component of the GE Speedtronic MKVI gas turbine control system, providing necessary emergency protection and control functions. Its robust design combines redundancy and advanced communication capabilities to ensure high reliability and safety of gas/steam turbine operation.

　　Frequently asked questions

　　What is IS215VPROH2BC?

　　It is a turbine protection plate developed by GE under the Mark VI series.

　　What is the main purpose of thermocouple input for gas turbine applications?

　　The thermocouple input in VPRO is mainly used for gas turbine applications. These inputs monitor exhaust temperature and serve as backup for overheat protection. There are a total of nine thermocouple inputs, with three connected to each VPRO.

　　How to use thermocouple input for overheat protection?

　　Thermocouple input can serve as a backup for exhaust overheating protection. If temperature anomalies occur during the operation of the gas turbine, these inputs can provide an additional monitoring layer to ensure the safety and integrity of the system.

　　What types of analog inputs are available and how are they configured?

　　It supports analog inputs, including a 5, 10 V DC and an optional 4-20 mA input. In addition, there are two 4-20 mA inputs. These analog inputs can be configured to accommodate various sensors and instruments, thereby enhancing the versatility of VPRO in different operational scenarios.

　　How to connect analog input to VPRO? What is the function of a terminal board?

　　Analog inputs (including 5, 10 V DC and optional 4-20 mA inputs, as well as two 4-20 mA inputs) can be connected to the TPRO terminal board. Then, the terminal board feeds these inputs in parallel to all three VPROs. This parallel connection ensures consistent distribution of analog inputs between modules.

　　Can analog inputs be customized according to specific requirements of gas turbine applications?

　　Yes, analog input provides customization flexibility. The ability to connect different types of analog sensors (including voltage and current inputs) enables users to customize monitoring functions according to specific requirements of gas turbine applications.

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