IS220PPRAH1A - Emergency Turbine Backup Protection I/O Module

SPECIFICATIONS:

Part Number: IS220PPRAH1A
Manufacturer: General Electric
Series: Mark VIeS
Board Type: Emergency Turbine Backup Protection I/O Module
Input Power Supply Voltage: 24 V DC
Number of Transducers: 2
Pressure wave frequency range: 1.5 Hz
Power Consumption: ≤ 15 W
Number of Input Channels: 16
Input Voltage: 0-5 V
Maximum lead Resistance: 15 maximum
MPU Pulse Rate Range: 2 Hz
Protocols Supported: MODBUS TCP/IP
Dimensions: 33.0 cm wide x 17.08 cm high
Mounting Type: Surface-mount
Operating Temperature: -20°C to +70°C
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Weight: 1.2 kg

FUNCTIONAL DESCRIPTION:

IS220PPRAH1A is an Emergency Turbine Backup Protection I/O Module manufactured and designed by General Electric as part of the Mark VIeS Series used in GE Distributed Turbine Control Systems. The Emergency Turbine Protection (PPRA) I/O packs and associated TREA terminal board provide an independent backup overspeed protection system. They also provide an independent watchdog function for the primary control and isolated trip contact inputs. A protection system consists of three triple modular redundant (TMR) PPRA I/O packs mounted to a TREA terminal board with the WREA option board included. PPRA is a derivative of the standard Mark VIe PPRO Emergency Turbine Protection I/O pack. It adds hardware and uses altered firmware to support six-speed inputs in applications where dual-speed sensors per shaft are fanned to three protection I/O packs. The majority of the configuration, variables, and behavior of the PPRA are identical to those found in the PPRO. PPRA is specific to the TREA terminal board equipped with the WREA option board.

COMPATIBILITY:

PPRA is available in a IEC 61508 certified version for use in IEC 61511 certified safety loops. PPRAS1A with TREAS1A and WREAS1A are the certified versions of the PPRA module. PPRA mounts directly on TREA, and with TREA it is required to have the WREA option board mounted on the PPRA application-specific circuit board Option Header connector. PPRA mounted on TREA with WREA will only function correctly with three PPRA I/O packs. Single and dual-pack operation is not possible.

In systems with a single controller, the controller R network should be connected to the PPRA on the JX1 connector, the S network should be connected to PPRA on the JY1 connector, and the T network should be connected to the PPRA on the JZ1 connector. All three networks are coming from the single controller. In systems with dual controllers, the controller R network should be connected to the PPRA on the JX1 connector, the S network should be connected to PPRA on the JY1 connector, and both the R and S networks should be connected to the PPRA on the JZ1 connector. In systems with three controllers, the R network should be connected to the PPRA on the JX1 connector, the S network should be connected to PPRA on the JY1 connector, and the T network should be connected to the PPRA on the JZ1 connector.

INSTALLATION:

• Securely mount the TREA terminal board.
• Directly plug three PPRA I/O packs into the TREA.
• Slide the threaded posts on PPRA, located on each side of the Ethernet ports, into the slots on the terminal board mounting bracket. Adjust the bracket location so the
• DC-62 pin connector on PPRA and the terminal board fit together securely. Tighten the mounting bracket. The adjustment should only be required once in the life of the product.
• Securely tighten the nuts on the threaded posts locking PPRA in place. Plug in one or two Ethernet cables depending on the system configuration.
• PPRA is not sensitive to Ethernet connections and selects the proper operation over either port.
• Apply power by plugging in the power connector on the side of the module. The I/O module has inherent soft-start capability that controls current levels upon application.

OPERATIONS:

• High-speed processor with RAM and flash memory
• Two fully independent 10/100 Ethernet ports with connectors
• Hardware watchdog timer and reset circuit
• Internal temperature sensor
• Status-indication LEDs
• Electronic ID and the ability to read IDs on other boards
• Input power connector with soft start/current limiter
• Local power supplies, including sequencing and monitoring

PROTECTIVE FUNCTIONS

• Signal names that end with (SS) are created within PPRA and the data flow is out to the controller through signal space.
• Signal names that end with SS are created in the controller and the data flow is into PPRA through signal space.
• Signal names that end with (IO) are created within PPRA and the data flow is out to the hardware.
• Signal names that end with IO indicate the signal is a hardware input into PPRA.
• Signal names that end with anything containing CFG are part of the PPRA configuration. In this case, an attempt has been made to indicate what area
  of the PPRA configuration contains the variable.
• When J3 is referenced in a CFG, it refers to the connection point for the trip relay board, TREA, and the corresponding configuration values.
• The combination IO (SS) indicates a signal that comes from the hardware inputs to PPRA and is then sent out to the controller as part of signal space.

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FREQUENTLY ASKED QUESTIONS:

What is the purpose of the PPRA I/O pack and the TREA terminal board in turbine protection systems?

The PPRA I/O pack, together with the TREA terminal board, provides an independent backup overspeed protection system for turbines. It functions as an essential safeguard by independently monitoring and providing a watchdog function for the primary control system. The PPRA system operates in conjunction with triple modular redundant (TMR) architecture to ensure reliability and redundancy.

How does the PPRA differ from the PPRO I/O pack?

The PPRA I/O pack is a derivative of the PPRO but includes additional hardware and firmware modifications to support six-speed inputs. This makes it ideal for applications requiring dual-speed sensors per shaft distributed across three protection I/O packs. While the majority of configurations and behaviors of the PPRA are similar to the PPRO, the PPRA is tailored exclusively for use with the TREA terminal board and the WREA option board.

How is the PPRA connected in systems with different controller configurations?

In single-controller systems, the R, S, and T networks are connected to the JX1, JY1, and JZ1 connectors on the PPRA, respectively. In dual-controller systems, the R network connects to JX1, the S network to JY1, and both R and S networks to JZ1. For systems with three controllers, the R, S, and T networks are connected to the JX1, JY1, and JZ1 connectors, respectively.