GE IS200SPROH1ACC Mark VIe Backup Protection Terminal Board

The GE IS200SPROH1ACC is a backup protection terminal board designed for the GE Mark VIe turbine control system. It provides signal termination and interfacing for the PPRO I/O pack, including turbine speed inputs, generator and bus voltage sensing, and connections to the backup trip relay terminal board. Its integrated potential transformers support voltage signal acquisition for generator-bus synchronization functions.

Functional Description

The IS200SPROH1ACC provides the physical signal interface between the turbine control hardware, speed sensing circuits, generator and bus voltage inputs, and backup trip protection connections.

Two onboard single-phase potential transformers (PTs) acquire voltage signals from the generator and bus. Their secondary outputs provide isolated voltage signals for the associated control hardware, supporting voltage monitoring and synchronization operations.

The board also connects to the PPRO I/O pack, which processes the associated speed and control signals. This arrangement separates field signal termination from the processing functions performed by the connected control hardware.

Speed Signal and PPRO Interface

The board provides dedicated terminal assignments for speed inputs and connections to the PPRO I/O pack.

• Terminals 19-24 are assigned to speed inputs.
• Terminals 7-15 are routed to the JA1 PPRO connector for designated or reserved control connections.
• Terminals 5-6 and 16-18 have no board connection according to the available terminal assignment information.

The JA1 connector provides the PPRO interface, while JA3 provides a cable connection to the backup trip terminal board. These connections allow the board to participate in the backup protection signal arrangement.

Generator and Bus Voltage Sensing

The IS200SPROH1ACC incorporates two single-phase potential transformers for generator and bus voltage measurement. Each transformer provides a nominal secondary output of 115 V rms.

The specified synchronization voltage range is 75-130 V rms, with an input loading requirement below 3 VA per PT input. The magnetic isolation barrier is rated at 1,500 V rms, providing electrical separation between the voltage sensing circuits and associated circuitry.

The stated wiring capability is up to 1,000 ft using 18 AWG cable. Actual installation should follow the applicable system wiring documentation and the requirements of the connected equipment.

Terminal Assignments and Connectors

The available terminal information identifies the following connections:

Verify the connector assignments and terminal wiring against the documentation for the installed board revision before connecting field wiring.

Technical Specifications

Frequently Asked Questions

Q: What is the primary function of the GE IS200SPROH1ACC?

A: It provides terminal connections and signal interfacing for a Mark VIe backup protection arrangement. Its functions include speed signal connections, generator and bus voltage sensing, and interfacing with the backup trip relay terminal board.

Q: What voltage signals are supported by the onboard potential transformers?

A: The board has two single-phase PTs with nominal secondary outputs of 115 V rms. The specified synchronization voltage range is 75-130 V rms, and each PT input requires less than 3 VA loading.

Q: Which hardware connection should be checked when replacing this board?

A: Check the PPRO connection at JA1, the backup trip terminal board connection at JA3, and the field terminal assignments. Confirm the complete part number IS200SPROH1ACC and the installed hardware revision before replacement. Similar model numbers should not be assumed to have identical terminal layouts.