GE DS200TCCBG3B Common Extended Analog IO Board

الوصف

The GE ¹$\text{DS200TCCBG3B}$ is a Common Extended Analog ²$\text{I/O}$ Board for the General Electric Speedtronic ³$\text{Mark V}$ Turbine Control System.⁴

This board is a crucial interface for expanded signal processing, serving to condition and scale various analog signals from field devices before they are used by the $\text{Mark V}$‘s main control processors ($\text{R}$, $\text{S}$, and $\text{T}$). The ‘$\text{G3B}$‘ in the part number indicates it is a later revision ($\text{G3}$ group, $\text{B}$ revision) of the extended analog $\text{I/O}$ card.

💡 Function and Purpose

The primary function of the $\text{DS200TCCBG3B}$ is to read and process a supplemental set of analog signals that are essential for turbine and generator monitoring, particularly those involving high-fidelity measurements.

Signal Types Processed

• Temperature Inputs ($\text{RTD}$s): It processes signals from Resistance Temperature Detectors ($\text{RTD}$s) to monitor critical temperatures within the turbine, generator, or bearings.
• Current Inputs ($\text{mA}$): It conditions and scales standard industrial signals, such as $\text{4-20 mA}$ and $\text{0-1 mA}$ current loop inputs, used for transmitters measuring pressure, flow, and level.
• Generator and Electrical $\text{I/O}$: It is vital for generator control functions by handling the conditioning and scaling of:
  • Potential Transformer ($\text{PT}$) inputs for bus and generator voltage signals.
  • Current Transformer ($\text{CT}$) inputs for line current signals.
  • The board performs the necessary software-based transducing and calculations to convert these electrical measurements into usable control data.

System Location

As a ⁵$\text{TCCB}$ board (TC2000 Common Extended Analog Board), it typically resides in a core module within the ⁶$\text{Mark V}$ cabinet, such as the ⁷$\text{R5}$ core, where it communicates with its dedicated terminal board (e.g., ⁸$\text{TBCB}$) via ribbon cables to receive the raw field signals.⁹

💻 Technical Features

The $\text{DS200TCCBG3B}$ contains its own local intelligence to execute I/O processing independent of the main turbine control algorithms:

• Microprocessor: It features an onboard ¹⁰$\text{80196}$ Microprocessor to manage signal conditioning, scaling, and communication with the main control processors.¹¹

   

• Memory: Multiple ¹²$\text{PROM}$ modules store the board’s firmware and are critical for its specific configuration.¹³ When replacing the board, these $\text{PROM}$s or the configuration file must be correct for the specific turbine application.

   

• Connectivity: The board has several multi-pin connectors (such as ¹⁴$\text{JCC}$ and ¹⁵$\text{JDD}$) for ribbon cable connections to power supplies and its associated terminal boards.¹⁶

   

• Revision ($\text{G3B}$): The ‘$\text{G3}$‘ group represents a functional update to the board’s design compared to the older $\text{G1}$ or $\text{G2}$ versions, offering enhanced features or component updates while maintaining backwards-compatibility where possible. The ‘¹⁷$\text{B}$‘ is a minor hardware or artwork revision.¹⁸