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The GE IS200ISBBG1A is an InSync Bus Bypass Card (ISBB) used in General Electric’s Mark VI Speedtronic Turbine Control System.
Its specific function is to maintain the integrity of the ISBus (a high-speed, proprietary communications bus) in configurations where a control module might be removed or is not present.
⚙️ Key Function and Role
The IS200ISBBG1A is a passive utility card designed for reliability and system maintenance:
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Bus Integrity: The primary role of this board is to act as a bypass or jumper for the ISBus communication path. This is essential in Triple Modular Redundant (TMR) Mark VI systems (which have R, S, and T control modules).
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Module Removal: If one of the three main control modules (e.g., the ‘S’ module) needs to be removed for maintenance or replacement while the turbine is running, the ISBB board is installed in its place.
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Signal Rerouting: Once installed, the ISBB card passively reroutes the ISBus signal, effectively bridging the gap where the module used to be. This ensures the remaining two modules (R and T) can continue communicating and remain synchronized (“InSync”) without interruption.
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Passive Design: As a bypass card, it typically contains no active electronic components or processors. It uses simple conductive traces and/or passive components (resistors, caps) to maintain the electrical characteristics of the bus and ensure the signal path is unbroken.
🔌 Technical and System Details
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System Series: Mark VI Speedtronic (often also used in EX2100 Excitation Systems).
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Product Type: InSync Bus Bypass Card (ISBB).
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Form Factor: The board uses the standard IS200 Innovation Series form factor, designed to plug directly into the rack’s backplane where the main controller would normally reside.
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Purpose: The existence of a bypass card is a key design element in TMR systems, allowing for online maintenance without sacrificing the operational integrity of the control system—a critical feature for minimizing turbine downtime.
