IS220PPRAS1A is an Emergency Turbine Protection Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in distributed control systems. A backup Overspeed protection system that is independent is offered by the Emergency Turbine Protection (PPRA) I/O packs and related TREA terminal board. Inputs for the main control and isolated trip contacts are also given a separate watchdog role by them. A protection system is made up of three triple modular redundant (TMR) PPRA I/O packs that are mounted to a TREA terminal board and have a WREA option board attached.
- The standard Mark VIe PPRO Emergency Turbine Protection I/O pack is the ancestor of PPRA. In applications where dual-speed sensors per shaft are fanned to three protective I/O packs, it needs new hardware and modified code to provide six-speed inputs. The majority of the PPRA's settings, parameters, and behavior are the same as those in the PPRO.
- The TREA terminal board with the WREA option board is the only one that supports PPRA. Other settings that PPRO supports cannot be used with PPRA. In order to communicate with the control modules through IONet, PPRA additionally has an Ethernet connection.
- The primary and backup trip prevention systems for the Mark VIe control are built 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), providing primary protection. A TREA terminal board installed with PPRA offers backup protection.
PPRA supports six-speed signals (specified as three sets of speed pairs) for hardware-implemented Overspeed protection, acceleration, and deceleration. It keeps an eye on the primary control's performance. Through a thorough set of feedback signals, PPRA keeps track of the status and functionality of the TREA trip board. The backup trip relays on the TREA board will trip in the event of a failure, and the primary control will also trip. The primary control operation has no impact on PPRA and is completely independent of it.
COMPATIBILITY:
For usage in IEC 61511-approved safety loops, PPRA is offered in a version that is IEC 61508 certified. 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 work 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, the R network of the controller, the S network of the controller, the JY1 connector of the controller, and the JZ1 connector of the controller should all be linked to the PPRA. The same controller powers all three networks.
INSTALLATION:
- Mount the TREA terminal board firmly.
- Immediately connect the TREA with three PPRA I/O packets.
- Using the holes on the terminal board mounting bracket, insert the threaded posts on PPRA that are situated on either side of the Ethernet ports.
- To ensure a tight fit between the DC-62 pin connector on the PPRA and the terminal board, adjust the bracket's position.
- Secure the mounting bracket firmly. Only one adjustment should be necessary during the lifespan of the product. Lock PPRA in place by firmly tightening the nuts on the threaded posts.
- Depending on the setup of the machine, connect either one or two Ethernet wires. Ethernet connections are not sensitive to PPRA, which chooses the appropriate operation over either port.
- Connect the module's power connector to an electrical source to supply power. The I/O module has a built-in soft-start feature that regulates current levels when used.
- Configure the module using the ToolboxST* program as appropriate.
OPERATION:
A processing board is shared by each Mark VIe Ethernet I/O pack or module. It contains the following:
- A quick processor with RAM and flash memory is number one.
- Two plugs for entirely independent 10/100 Ethernet ports
- Hardware reset and watchdog timer circuit
- A sensor for internal temperature
- LEDs that indicate the status
- The capacity to read IDs on other boards and electronic identification
- An input power connector with a current limiter and a soft start
- Local power supplies, which also include monitoring and sequencing
