Description
Three triple modular redundant (TMR) PPRA I/O packs are installed to a TREA terminal board with the WREA option board included to make up a protective system. The IS220PPRAS1B is the successor to the standard Mark VIe PPRO Emergency Turbine Protection I/O pack and it requires new hardware and modified code to provide six speed inputs in applications where dual speed sensors per shaft are fanned to three protective I/O packs.
Here are some of the key features of the GE IS220PPRAS1B:
- Provides independent backup Overspeed protection
- Has an independent watchdog function for the principal control and isolated trip contact input
- Supports six speed signals (specified as three sets of speed pairs) for firmware overspeed, acceleration, deceleration, and a hardware implemented overspeed protection
- Monitors the health of the main control
- Uses a broad range of feedback signals to monitor the state and functionality of the TREA trip board
- Communicates with the control modules through IONet
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