The IS215VPROH2BC is the core safety protection board in the GE Mark VI Speedtronic control system, specifically designed for emergency tripping and overspeed protection (VPRO module) of steam or gas turbines. As an independent safety line, it monitors turbine speed in real time via a directly connected speed sensor (MPU). Upon detecting overspeed or receiving an emergency stop command, it actuates a solenoid valve to shut off unit operation within milliseconds.
The IS215VPROH2BC fully supports a Triple Module Redundancy (TMR) architecture, typically consisting of three boards (X, Y, and Z channels) working collaboratively, employing an internal "two-out-of-three" voting mechanism to determine tripping. This design not only eliminates false tripping due to single points of failure but also allows engineers to hot-swap individual faulty boards online without affecting continuous unit operation.
In terms of hardware version, the H2B version is a low-power optimized version of its predecessor, employing a simplified circuit design and primarily responsible for managing a single TREG emergency trip terminal. The IS215VPROH2BC integrates a high-performance microprocessor and Ethernet communication interface to ensure stability in extreme industrial environments, while quickly feeding back real-time status and diagnostic data to the main control system.
