IS220PPRAS1A GE MKVIe, I/O Pack, SPD PROTECT, Safety Rated

Description:

The IS220PPRAS1A is a terminal board designed and manufactured by General Electric for emergency turbine protection as part of the Mark VIe series used in distributed control systems. It offers an independent backup overspeed protection system and assigns separate watchdog roles to the main control inputs and isolated trip contacts. The protection system comprises three triple modular redundant (TMR) PPRA I/O packs mounted on a TREA terminal board with a WREA option board attached.

The standard Mark VIe PPRO Emergency Turbine Protection I/O pack is the precursor to the PPRA, which requires new hardware and modified code to provide six-speed inputs when dual-speed sensors per shaft are fanned to three protective I/O packs. Most of the PPRA's settings, parameters, and behaviors are identical to those in the PPRO. The only board that supports PPRA is the TREA terminal board with the WREA option board, and other settings supported by PPRO cannot be used with PPRA. An Ethernet connection is also included in the PPRA for communication with the control modules through IONet.

The primary and backup trip prevention systems for the Mark VIe control are designed to work together at the trip terminal board level. The Turbine Primary I/O pack (PTUR), when connected with PPRA/TREA, operates a primary trip board (usually TRPA), offering primary protection. A TREA terminal board equipped with PPRA provides backup protection. The PPRA supports six-speed signals for hardware-implemented Overspeed protection, acceleration, and deceleration, and monitors the main control's performance. Through a comprehensive set of feedback signals, the PPRA tracks the status and functionality of the TREA trip board. If a fault occurs, the backup trip relays on the TREA board will trip, and the primary control will also trip. The primary control operation has no impact on the PPRA and is completely independent of it.

For use in IEC 61511-certified safety loops, the PPRA is available in an IEC 61508-certified version. The certified versions of the PPRA module are PPRAS1A with TREAS1A and WREAS1A. When using TREA, which PPRA mounts on directly, the WREA option board must be installed on the PPRA application-specific circuit board Option Header connector. Only three PPRA I/O packets will function properly with a PPRA installed on a TREA with WREA. It is not possible to operate a single or twin pack.

In systems with a single controller, all three networks of the controller (R, S, and JY1 connectors) should be linked to the PPRA. The same controller powers all three networks.

To install, firmly mount the TREA terminal board and immediately connect it with three PPRA I/O packets. Insert the threaded posts on either side of the Ethernet ports into the holes on the terminal board mounting bracket and adjust the bracket's position to ensure a tight fit between the DC-62 pin connector on the PPRA and the terminal board. Securely fasten the mounting bracket and lock the PPRA in place by tightening the nuts on the threaded posts. Connect one or two Ethernet wires depending on the machine setup, and connect the module's power connector to an electrical source. Configure the module using the ToolboxST program as appropriate.

Datasheet Link:

IS220PPRAS1A GE MKVIe, I/O Pack, SPD PROTECT, Safety Rated PDF Datasheet